.gitignore

@@ -24,11 +24,12 @@ _testmain.go
 *.prof
 vendor/*
 
+# vendor management
+vendor/src/*
+vendor/pkg/*
 bin/*
-sigtool
 
 .??*.sw?
 *.pub
 *.key
 *.sig
-releases/*

.mise.toml

@@ -1,2 +0,0 @@
-[tools]
-golang = "1.24"

Makefile

@@ -4,10 +4,11 @@ pwd = $(shell pwd)
 .PHONY: all test clean realclean
 
 all:
-	./build -s
+	mkdir -p bin
+	go build -o bin/sigtool .
 
 test:
 	go test ./sign
 
 clean realclean:
-	rm -rf bin
+	rm -f bin/sigtool

README.md

@@ -4,49 +4,24 @@
 
 
 ## What is this?
-`sigtool` is an opinionated tool to generate keys, sign, verify, encrypt &
-decrypt files using Ed25519 signature scheme.  In many ways, it is like
-like OpenBSD's [signify][1] -- except written in Golang and definitely
-easier to use. It can use SSH ed25519 public and private keys.
+`sigtool` is an opinionated tool to generate, sign and verify Ed25519
+signatures on files.  In many ways, it is like like OpenBSD's signify_
+-- except written in Golang and definitely easier to use.
 
 It can sign and verify very large files - it prehashes the files
-with SHA-512 and then signs the SHA-512 checksum. The keys and signatures
-are human readable YAML files.
+with SHA-512 and then signs the SHA-512 checksum.
 
-It can encrypt files for multiple recipients - each of whom is identified
-by their Ed25519 public key. The encryption generates ephmeral
-Curve25519 keys and creates pair-wise shared secret for each recipient of
-the encrypted file. The caller can optionally use a specific private key
-during the encryption process - this has the benefit of also authenticating
-the sender (and the receiver can verify the sender if they possess the
-corresponding sender's public key).
-
-The sign, verify, encrypt, decrypt operations can use OpenSSH Ed25519 keys
-*or* the keys generated by sigtool. This means, you can send encrypted
-files to any recipient identified by their comment in `~/.ssh/authorized_keys`.
+All the artifacts produced by this tool are standard YAML files -
+thus, human readable.
 
 ## How do I build it?
-You need two things:
+With Go 1.5 and later:
 
-1. Protobuf compiler:
-
-   On Debian based systems: `apt install protobuf-compiler`
-
-   Consult your OS's package manager to install protobuf tools;
-   these are typically named 'protobuf' or 'protoc'.
-
-2. go 1.13+ toolchain
-
-
-Next, build sigtool:
-
-    git clone https://git.rgst.io/homelab/sigtool/v3
+    git clone https://github.com/opencoff/sigtool
     cd sigtool
     make
 
-The binary will be in `./bin/$HOSTOS-$ARCH/sigtool`.
-where `$HOSTOS` is the host OS where you are building (e.g., openbsd)
-and `$ARCH` is the CPU architecture (e.g., amd64).
+The binary will be in `./sigtool`.
 
 ## How do I use it?
 Broadly, the tool can:
@@ -54,8 +29,6 @@ Broadly, the tool can:
 - generate new key pairs (public key and private key)
 - sign a file
 - verify a file against its signature
-- encrypt a file
-- decrypt a file
 
 ### Generate Key pair
 To start with, you generate a new key pair (a public key used for
@@ -76,15 +49,15 @@ e.g.,  to sign `archive.tar.gz` with private key `/tmp/testkey.key`:
 
     sigtool sign /tmp/testkey.key archive.tar.gz
 
-If *testkey.key* was encrypted without a user pass phrase:
+If *testkey.key* was encrypted with a user pass phrase:
 
-    sigtool sign --no-password /tmp/testkey.key archive.tar.gz
+    sigtool sign -p /tmp/testkey.key archive.tar.gz
 
 
 The signature can also be written directly to a user supplied output
 file.
 
-    sigtool sign -o archive.sig /tmp/testkey.key archive.tar.gz
+    sigtool sign -p -o archive.sig /tmp/testkey.key archive.tar.gz
 
 
 ### Verify a signature against a file
@@ -100,190 +73,22 @@ e.g., to verify the signature of *archive.tar.gz* against
 
     sigtool verify /tmp/testkey.pub archive.sig archive.tar.gz
 
+## How is the private key protected?
+The Ed25519 private key is encrypted using a key derived from the
+user supplied pass phrase. This pass phrase is used to derive an
+encryption key using the Scrypt key derivation algorithm. The
+resulting derived key is XOR'd with the Ed25519 private key before
+being committed to disk. To protect the integrity of the process,
+the essential parameters used for deriving the key, and the derived
+key are hashed via SHA256 and stored along with the encrypted key.
 
-You can also pass a public key as a string (instead of a file):
-
-    sigtool verify iF84Dymq/bAEnUMK6DRIHWAQDRD8FwDDDfsgFfzdjWM= archive.sig archive.tar.gz
-
-Note that signing and verifying can also work with OpenSSH ed25519
-keys.
-
-### Encrypt a file by authenticating the sender
-If the sender wishes to prove to the recipient that they  encrypted
-a file:
-
-    sigtool encrypt -s sender.key to.pub -o archive.tar.gz.enc archive.tar.gz
-
-
-This will create an encrypted file *archive.tar.gz.enc* such that the
-recipient in possession of *to.key* can decrypt it. Furthermore, if
-the recipient has *sender.pub*, they can verify that the sender is indeed
-who they expect.
-
-### Decrypt a file and verify the sender
-If the receiver has the public key of the sender, they can verify that
-they indeed sent the file by cryptographically checking the output:
-
-    sigtool decrypt -o archive.tar.gz -v sender.pub to.key archive.tar.gz.enc
-
-Note that the verification is optional and if the `-v` option is not
-used, then decryption will proceed without verifying the sender.
-
-### Encrypt a file *without* authenticating the sender
-`sigtool` can generate ephemeral keys for encrypting a file such that
-the receiver doesn't need to authenticate the sender:
-
-    sigtool encrypt to.pub -o archive.tar.gz.enc archive.tar.gz
-
-This will create an encrypted file *archive.tar.gz.enc* such that the
-recipient in possession of *to.key* can decrypt it.
-
-### Encrypt a file to an OpenSSH recipient *without* authenticating the sender
-Suppose you want to send an encrypted file where the recipient's
-public key is in `~/.ssh/authorized_keys`. Such a recipient is identified
-by their OpenSSH key comment (typically `name@domain`):
-
-    sigtool encrypt user@domain -o archive.tar.gz.enc archive.tar.gz
-
-If you have their public key in file "name-domain.pub", you can do:
-
-    sigtool encrypt name-domain.pub -o archive.tar.gz.enc archive.tar.gz
-
-This will create an encrypted file *archive.tar.gz.enc* such that the
-recipient can decrypt using their private key.
-
-## Technical Details
-
-### How is the file encryption done?
-The file encryption uses AES-GCM-256 in AEAD mode. The encryption uses
-a random 32-byte AES-256 key. This root key is expanded via
-HKDF-SHA256 into:
-
-   - AES-GCM-256 key (32 bytes)
-   - AES Nonce (12 bytes)
-   - HMAC-SHA-256 key (32 bytes)
-
-The input to the HKDF is the root-key, header-checksum ("salt") and
-a context string.
-
-The input is broken into chunks and each chunk is individually AEAD encrypted.
-The default chunk size is 4MB (4 * 1048576 bytes). Each chunk generates
-its own nonce: the top-4 bytes of the nonce is the chunk-number. The
-actual chunk-length and EOF marker is used as additional data (the
-"AD" of "AEAD").
-The last block has its most-signficant-bit set to 1 to denote EOF. Thus, the
-maximum chunk size is set to 1GB.
-
-We calculate a running hmac of the plaintext blocks; when sender
-identity is present, the final HMAC is signed via the sender's
-Ed25519 key. This signature is appended as the "trailer" (last 64
-bytes of the encrypted file are the Ed25519 signature).
-
-When sender identity is not present, the last bytes are random
-bytes.
-
-### What is the public-key cryptography in sigtool?
-`sigtool` uses ephemeral Curve25519 keys to generate shared secrets
-between pairs of sender & one or more recipients. This pairwise shared
-secret is used as a key-encryption-key (KEK) to wrap the
-data-encryption key in AEAD mode. Thus, each recipient has their own
-individual encrypted key blob - that **only** they can decrypt.
-
-If the sender authenticates the encryption by providing their secret
-key, the encryption key material is signed via Ed25519 and the signature
-is encrypted (using the data-encryption key) and stored in the
-header. If the sender opts to not authenticate, a "signature" of all
-zeroes is encrypted instead.
-
-The Ed25519 keys generated by `sigtool` or OpenSSH are transformed to their
-corresponding Curve25519 points in order to generate the pair-wise shared secret.
-This elliptic co-ordinate transform follows [FiloSottile's writeup][2].
-
-### Format of the Encrypted File
-Every encrypted file starts with a header and the header-checksum:
-
-* Fixed-size header
-* Variable-length header
-* SHA256 sum of both of the above
-
-The fixed length header is:
-
-    7 byte magic ("SigTool")
-    1 byte version number
-    4 byte header length (big endian encoding)
-
-The variable length header has the per-recipient wrapped keys. This is
-described as a protobuf file (sign/hdr.proto):
-
-```protobuf
-    message header {
-        uint32 chunk_size = 1;
-        bytes  salt       = 2;
-        bytes  pk         = 3;  // sender's ephemeral curve PK
-        bytes  sender     = 4;  // ed25519 signature of key material
-        repeated wrapped_key keys = 5;
-    }
-
-    /*
-     * A file encryption key is wrapped by a recipient specific public
-     * key. WrappedKey describes such a wrapped key.
-     */
-    message wrapped_key {
-        bytes d_key = 1;
-        bytes nonce = 2;
-    }
-```
-
-The SHA256 sum covers the fixed-length and variable-length headers.
-
-The encrypted data immediately follows the headers above. Each encrypted
-chunk is encoded the same way:
-
-```C
-    4 byte chunk length (big endian encoding)
-    AEAD encrypted chunk data
-    AEAD tag
-```
-
-The chunk length does _not_ include the AEAD tag length; it is implicitly
-computed. The chunk data and AEAD tag are treated as an atomic unit for AEAD
-decryption.
-
-### How is the private key protected?
-The Ed25519 private key is encrypted in AES-GCM-256 mode using a key
-derived from the user's pass-phrase. The user pass phrase is expanded via
-SHA256; this expanded pass phrase is fed to `scrypt()` to
-generate a key-encryption-key.  In pseudo code, this operation looks
-like below:
-
-    passphrase = get_user_passphrase()
-    expanded   = SHA512(passphrase)
-    salt       = randombytes(32)
-    key        = Scrypt(expanded, salt, N, r, p)
-    esk        = AES256_GCM(ed25519_private_key, key)
-
-Where, ```N```, ```r```, ```p``` are Scrypt parameters. In our
-implementation:
-
-    N = 2^19 (1 << 19)
-    r = 8
-    p = 1
-
+As an additional security measure, the user supplied pass phrase is
+hashed with SHA512.
 
 ## Understanding the Code
-The core logic is in `src/sign`: it is a library that exposes all the
-functionality: key generation, key parsing, signing, encryption, decryption
-etc.
-
-* `src/encrypt.go` contains the core encryption, decryption code
-* `src/sign.go`    contains the Ed25519 signing, verification code
-* `src/keys.go`    contains key generation, serialization, de-serialization
-* `src/ssh.go`     contains code to parse SSH Ed25519 key files
-* `src/stream.go`  contains code that provides an `io.Reader` and `io.WriteCloser` interface
-                   for encryption and decryption.
-* `tests.sh`       simple round trip test using the tool; this is in addition to the tests in
-                   `sign/`.
-
+`src/sign` is a library to generate, verify and store Ed25519 keys
+and signatures.  It uses the extended library (golang.org/x/crypto)
+for the underlying operations.
 
 The generated keys and signatures are proper YAML files and human
 readable.
@@ -296,11 +101,6 @@ Signatures on large files are calculated efficiently by reading them
 in memory mapped mode (```mmap(2)```) and hashing the file contents
 using SHA-512. The Ed25519 signature is calculated on the file-hash.
 
-### Tests
-The core library in `sign/` has extensive tests to verify signing and encryption.
-Additionally, a simple shell script `tests.sh` does a full roundtrip of tests
-using `sigtool`.
-
 ## Example of Keys, Signature
 
 ### Ed25519 Public Key
@@ -311,26 +111,44 @@ A serialized Ed25519 public key looks like so:
 ### Ed25519 Private Key
 And, a serialized Ed25519 private key looks like so:
 
-```yaml
-
     esk: t3vfqHbgUiA733KKPymFjWT8DdnBEkiMfsDHolPUdQWpvVn/F1Z4J6KYV3M5rGO9xgKxh5RAmqt+6LKgOiJAMQ==
     salt: pPHKG55UJYtJ5wU0G9hBvNQJ0DvT0a7T4Fmj4aPB84s=
     algo: scrypt-sha256
+    verify: JvjRjJMKhJhBmZngC3Pvq7x3KCLKt7gar1AAz7HB4qM=
     Z: 131072
     r: 16
     p: 1
-```
 
+The Ed25519 private key is encrypted using Scrypt password hashing
+mechanism. A user supplied passphrase to protect the private key
+is first pre-hashed using SHA-512 before being used in
+```scrypt()```. In pseudo code, this operation looks like below:
+
+    passphrase = get_user_passphrase()
+    hpass      = SHA512(passphrase)
+    salt       = randombytes(32)
+    xorkey     = Scrypt(hpass, salt, N, r, p)
+    verify     = SHA256(salt, xorkey)
+    esk        = ed25519_private_key ^ xorkey
+
+Where, ```N```, ```r```, ```p``` are Scrypt parameters. In our
+implementation:
+
+    N = 131072
+    r = 16
+    p = 1
+
+```verify```  is used during the decryption of the Ed25519 private
+key - *before* actually doing the "xor" operation. This check
+ensures that the supplied passphrase yields the same value as
+```verify```.
 
 ### Ed25519 Signature
 A generated signature looks like below after serialization:
 
-```yaml
-
     comment: inpfile=/tmp/file.txt
     pkhash: 36z9tCwTIVNwwDlExrB0SQ==
     signature: ow2oBP+buDbEvlNakOrsxgB5Yc/7PYyPVZCkfyu7oahw8BakF4Qf32uswPaKGZ8RVz4uXboYHdZtfrEjCgP/Cg==
-```
 
 Here, ```pkhash`` is a SHA256 of the public key needed to verify
 this signature.
@@ -345,5 +163,4 @@ See the file ``LICENSE.md`` for the full terms of the license.
 ## Author
 Sudhi Herle <sw@herle.net>
 
-[1]: https://www.openbsd.org/papers/bsdcan-signify.html
-[2]: https://blog.filippo.io/using-ed25519-keys-for-encryption/
+.. _signify: https://www.openbsd.org/papers/bsdcan-signify.html

build

@@ -1,462 +0,0 @@
-#! /usr/bin/env bash
-
-# Tool to build go programs in this repo
-#
-# - it tacks on a version number for use by the individual tools
-# - it supports git and mercurial version#
-#
-# NB:
-#   o the attempt at decoding dirty repo state for mercurial is
-#     borked. It doesn't know about untracked files
-#
-# (c) 2016 Sudhi Herle
-#
-# License: GPLv2
-#
-Progs="src:sigtool"
-
-# Relative path to protobuf sources
-# e.g. src/foo/a.proto
-Protobufs="internal/pb/hdr.proto"
-
-#set -x
-
-# -- DO NOT CHANGE ANYTHING AFTER THIS --
-
-Z=`basename $0`
-PWD=`pwd`
-
-Static=0
-Dryrun=0
-Prodver=""
-Repover=""
-Verbose=0
-Go=`which go`
-Bindir=$PWD/bin
-
-die() {
-    echo "$Z: $@" 1>&2
-    exit 0
-}
-
-warn() {
-    echo "$Z: $@" 1>&2
-}
-
-case $BASH_VERSION in
-    4.*|5.*) ;;
-
-    *) die "I need bash 4.x to run!"
-        ;;
-esac
-
-getvcs_version() {
-    local rev=
-    local prodv=
-    local git=`which git`
-    local hg=`which hg`
-
-    if [ -n "$git" ]; then
-        local xrev=$(git describe --always --dirty --long --abbrev=12) || exit 1
-        rev="git:$xrev"
-        prodv=$(git tag --list | sort -V | tail -1)
-    elif [ -n "$hg" ]; then
-        local xrev=$(hg id --id) || exit 1
-        local brev=${xrev%+}
-        if [ "$brev" != "$xrev" ]; then
-            rev="hg:${brev}-dirty"
-        else
-            rev="hg:${brev}"
-        fi
-        prodv=$(hg log -r "branch(stable) and tag()" -T "{tags}\n" | sort -V | tail -1)
-    else
-        warn "no git or hg found; can't get VCS info"
-        rev="UNKNOWN-VER"
-    fi
-
-    [ -n "$Prodver" ] && prodv=$Prodver
-
-    echo "$rev $prodv"
-    return 0
-}
-
-read -r Repover Prodver <<< $(getvcs_version)
-
-
-usage() {
-    declare -a progv=($Progs)
-    declare n=${#progv[@]}
-    declare pstr=
-
-    for ((i=0; i < n; i++)); do
-        local ent=${progv[$i]}
-        local dir=${ent%%:*}
-        local tool=${ent##*:}
-        pstr=$(printf "$pstr\n\t%s $Prodver $Repover (from ./%s)" $tool $dir)
-    done
-
-    cat <<EOF
-$0 - A Go production build tool that adds git-repository information,
-product version, build-timestamp etc. It supports cross-compilation,
-static linking and generating protobuf output.
-
-Build output is in bin/\$OS-\$CPU for a given OS, CPU combination.
-
-Usage: $0
-       $0 [options] [PROGS]
-
-Where OS-ARCH denotes one of the valid OS, ARCH combinations supported by 'go'.
-And, PROGS is one or more go programs.
-
-With no arguments, $0 builds: $pstr
-
-The repository's latest tag is used as the default version of the software being
-built. The current repository version is $Repover.
-
-Options:
-    -h, --help          Show this help message and quit
-    -b D, --bindir=D    Put the binaries in the directory 'D' [$Bindir]
-    -s, --static        Build a statically linked binary [False]
-    -V N, --version=N   Use 'N' as the product version string [$Prodver]
-    -a X, --arch=X      Cross compile for OS-CPU 'X' [$hostos-$hostcpu]
-    -n, --dry-run       Dry-run, don't actually build anything [False]
-    -t, --test          Run "go test" on modules named on the command line [False]
-    -v, --verbose       Build verbosely (adds "-v" to go tooling) [False]
-    --vet               Run "go vet" on modules named on the command line [False]
-    --mod               Run "go mod ..." [False]
-    --go=G              Use Go in 'G' [$Go]
-    -x                  Run in debug/trace mode [False]
-    --print-arch        Print the target architecture and exit
-EOF
-
-    exit 0
-}
-
-host=`uname|tr '[A-Z]' '[a-z]'`
-
-declare -A oses
-declare -A cpus
-declare -A cgo
-
-# Supported & Verified OS/CPU combos for this script
-oslist="linux android openbsd freebsd darwin dragonfly netbsd windows"
-needcgo="android"
-cpulist="i386 amd64 arm arm64"
-cpualias_i386="i486 i586 i686"
-cpualias_amd64="x86_64"
-cpualias_arm64="aarch64"
-
-# CGO Cross-Compilers for various CPU+OS combinations of Android
-android_i386=i686-linux-android-gcc
-android_arm64=aarch64-linux-android-gcc
-android_arm=arm-linux-androideabi-gcc
-
-# initialize the various hash tables
-for o in $oslist;  do oses[$o]=$o; done
-for o in $needcgo; do cgo[$o]=$o;  done
-for c in $cpulist; do
-    cpus[$c]=$c
-    a="cpualias_$c"
-    a=${!a}
-    for x in $a; do cpus[$x]=$c; done
-done
-
-
-Tool=
-doinit=0
-args=
-Printarch=0
-
-#set -x
-ac_prev=
-for ac_option
-do
-  shift
-
-  if [ -n "$ac_prev" ]; then
-    eval "$ac_prev=\$ac_option"
-    ac_prev=
-    continue
-  fi
-
-  case "$ac_option" in
-      -*=*) ac_optarg=`echo "$ac_option" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
-      *) ac_optarg= ;;
-  esac
-
-
-  case "$ac_option" in
-        --help|-h|--hel|--he|--h)
-            usage;
-            ;;
-
-        --arch=*)
-            Arch=$ac_optarg
-            ;;
-
-        -a|--arch)
-            ac_prev=Arch
-            ;;
-
-        -b|--bindir)
-            ac_prev=Bindir
-            ;;
-
-        --bindir=*)
-            Bindir=$ac_optarg
-            ;;
-
-        --version=*)
-            Prodver=$ac_optarg
-            ;;
-
-        --test|-t)
-            Tool=test
-            ;;
-
-        --vet)
-            Tool=vet
-            ;;
-
-        --mod)
-            Tool=mod
-            ;;
-
-        -V|--version)
-            ac_prev=Prodver
-            ;;
-
-        -v|--verbose)
-            Verbose=1
-            ;;
-
-        -s|--static)
-            Static=1
-            ;;
-
-        --dry-run|-n)
-            Dryrun=1
-            ;;
-
-        --debug|-x)
-            set -x
-            ;;
-
-        --go-root=*)
-            GoRoot=$ac_optarg
-            ;;
-
-        --print-arch)
-            Printarch=1
-            ;;
-
-        *) # first non option terminates option processing.
-           # we gather all remaining args and bundle them up.
-            args="$args $ac_option"
-            for xx
-            do
-                args="$args $xx"
-            done
-            break
-            ;;
-  esac
-done
-
-[ $Dryrun  -gt 0 ] && e=echo
-
-# let every error abort
-set -e
-
-# build a tool that runs on the host - if needed.
-hosttool() {
-    local tool=$1
-    local bindir=$2
-    local src=$3
-
-    p=$bindir/$tool
-    if [ -x $p ]; then
-        return 0
-    fi
-
-    local tmpdir=/tmp/$tool.$$
-    mkdir $tmpdir || die "can't make $tmpdir"
-
-    # since go1.20 - install uses env vars to decide where to put
-    # build artifacts. Why are all the google tooling so bloody dev
-    # hostile! WTF is wrong with command line args?!
-    export GOBIN=$bindir
-
-    # build it and stash it in the hostdir
-    echo "Building tool $tool from $src .."
-    (
-       cd $tmpdir
-       $e $Go install  $src@latest || die "can't install $tool"
-    )
-    $e rm -rf  $tmpdir
-
-    return 0
-}
-
-# protobuf gen
-buildproto() {
-    local pbgo=protoc-gen-go
-    local vtgo=protoc-gen-go-vtproto
-    local vtgo_src=github.com/planetscale/vtprotobuf/cmd/protoc-gen-go-vtproto
-    local pc
-    local args="$*"
-
-    local pgen=$(type -p protoc)
-    local gogen=$(type -p $pbgo)
-    local vt=$Hostbindir/$vtgo
-
-    [ -z $pgen  ] && die "install protoc tools"
-    [ -z $gogen ] && die "install protoc-gen-go"
-
-    # now install the vtproto generator
-    hosttool $vtgo $Hostbindir $vtgo_src
-
-    for f in $args; do
-        local dn=$(dirname $f)
-        local bn=$(basename $f .proto)
-
-
-        $e $pgen  \
-            --go_out=. --plugin protoc-gen-go=$gogen \
-            --go-vtproto_out=. --plugin protoc-gen-go-vtproto="$vt" \
-            --go-vtproto_opt=features=marshal+unmarshal+size  \
-             $f || die "can't generate protobuf output for $f .."
-    done
-
-    return 0
-}
-
-
-# the rest has to execute in the context of main shell (not funcs)
-
-hostos=$($Go  env GOHOSTOS)      || exit 1
-hostcpu=$($Go env GOHOSTARCH)    || exit 1
-
-# This fragment can't be in a function - since it exports several vars
-if [ -n "$Arch" ]; then
-    ox=${Arch%%-*}
-    cx=${Arch##*-}
-    [ "$ox" = "$cx" ] && cx=$hostcpu
-
-    os=${oses[$ox]}
-    cpu=${cpus[$cx]}
-    [ -z "$os" ]  && die "Don't know anything about OS $ox"
-    [ -z "$cpu" ] && die "Don't know anything about CPU $cx"
-
-    export GOOS=$os GOARCH=$cpu
-    cross=$os-$cpu
-
-else
-    os=$hostos
-    cpu=$hostcpu
-    cross=$os-$cpu
-fi
-
-# If we don't need CGO, then we can attempt a static link
-if [ -n "${cgo[$os]}" ]; then
-    export CGO_ENABLED=1
-
-    # See if we have a specific cross-compiler for this CPU+OS combo
-    xcc="${GOOS}_${GOARCH}"
-    xcc=${!xcc}
-    if [ -n "$xcc" ]; then
-        p=`type -p $xcc`
-        [ -n "$p" ] || die "Can't find $xcc! Do you have compilers for $GOARCH available in PATH?"
-        export CC=$xcc
-    else
-        echo "$Z: No Cross compiler defined for $GOOS-$GOARCH. Build may fail.." 1>&2
-    fi
-else
-    if [ $Static -gt 0 ]; then
-        export CGO_ENABLED=0
-
-        isuffix="--installsuffix cgo"
-        ldflags="-s"
-        msg="statically linked"
-    fi
-fi
-
-if [ $Printarch -gt 0 ]; then
-    echo "$hostos-$hostcpu"
-    exit 0
-fi
-
-
-# This is where build outputs go
-Outdir=$Bindir/$cross
-Hostbindir=$Bindir/$hostos-$hostcpu
-export PATH=$Hostbindir:$PATH
-
-[ -d $Outdir ]     || mkdir -p $Outdir
-[ -d $Hostbindir ] || mkdir -p $Hostbindir
-
-
-# Do Protobufs if needed
-if [ -n "$Protobufs" ]; then
-    set +e
-    buildproto $Protobufs
-    set -e
-fi
-
-# Get git/hg version info for the build
-repover="main.RepoVersion=$Repover"
-prodver="main.ProductVersion=$Prodver"
-ldflags="-ldflags \"-X $repover -X $prodver $ldflags -buildid=\""
-vflag=""
-
-[ $Verbose -gt 0 ] && vflag="-v"
-
-case $Tool in
-    test)
-        set -- $args
-        $e $Go test $vflag "$@"
-        ;;
-
-    vet)
-        set -- $args
-        $e $Go vet $vflag "$@"
-        ;;
-
-    mod)
-        set -- $args
-        $e $Go mod $vflag "$@"
-        ;;
-
-    *) # Default is to build programs
-        set -- $args
-        if [ -z "$1" ]; then
-            all=$Progs
-        else
-            all="$@"
-        fi
-
-        [ -z "$all" ] && die "No programs specified. Try '$Z --help'"
-
-        echo "Building $Prodver ($Repover), $cross $msg .."
-
-        for p in $all; do
-            if echo $p | grep -q ':' ; then
-                out=${p##*:}
-                dir=${p%%:*}
-            else
-                out=$p
-                dir=$p
-            fi
-
-            # Add .exe suffix to out if needed
-            if [ "$GOOS" = "windows" ]; then
-                base=${out%%.exe}
-                out="${base}.exe"
-            fi
-
-            echo "   $dir: $out .. "
-            $e eval $Go build $vflag -trimpath -o $Outdir/$out $isuffix "$ldflags" ./$dir || exit 1
-        done
-        ;;
-esac
-
-# vim: ft=sh:expandtab:ts=4:sw=4:tw=84:

go.mod

@@ -1,25 +1,10 @@
-module git.rgst.io/homelab/sigtool/v3
+module github.com/opencoff/sigtool
 
-go 1.24.0
+go 1.12
 
 require (
-	github.com/dchest/bcrypt_pbkdf v0.0.0-20150205184540-83f37f9c154a
-	github.com/opencoff/go-fio v0.5.14
-	github.com/opencoff/go-mmap v0.1.5
-	github.com/opencoff/go-utils v1.0.2
-	github.com/opencoff/pflag v1.0.7
-	github.com/planetscale/vtprotobuf v0.6.0
-	golang.org/x/crypto v0.36.0
-	google.golang.org/protobuf v1.36.5
-	gopkg.in/yaml.v3 v3.0.1
+	github.com/opencoff/go-utils v0.1.0
+	github.com/opencoff/pflag v0.3.3
+	golang.org/x/crypto v0.0.0-20190618222545-ea8f1a30c443
+	gopkg.in/yaml.v2 v2.2.2
 )
-
-require (
-	github.com/pkg/xattr v0.4.10 // indirect
-	github.com/puzpuzpuz/xsync/v3 v3.5.1 // indirect
-	golang.org/x/sys v0.31.0 // indirect
-	golang.org/x/term v0.30.0 // indirect
-)
-
-//replace github.com/opencoff/go-mmap => ../go-mmap
-//replace github.com/opencoff/go-utils => ../go-utils

go.sum

@@ -1,39 +1,19 @@
-github.com/dchest/bcrypt_pbkdf v0.0.0-20150205184540-83f37f9c154a h1:saTgr5tMLFnmy/yg3qDTft4rE5DY2uJ/cCxCe3q0XTU=
-github.com/dchest/bcrypt_pbkdf v0.0.0-20150205184540-83f37f9c154a/go.mod h1:Bw9BbhOJVNR+t0jCqx2GC6zv0TGBsShs56Y3gfSCvl0=
-github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
-github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/opencoff/go-fio v0.5.14 h1:PGi4XLLO4RSuc3m5exY0G2vweov6w3UThhScehBfM8c=
-github.com/opencoff/go-fio v0.5.14/go.mod h1:hoSySYpavRnfQUsxzUgadk31kYiNQhMDvA2MObsXKf8=
-github.com/opencoff/go-mmap v0.1.5 h1:RKPtevC4mOW5bi9skBPPo4nFTIH4lVWAL20Tff+FjLg=
-github.com/opencoff/go-mmap v0.1.5/go.mod h1:y/6Jk/tDUc00k3oSQpiJX++20Nw7xFSlc5kLkhGnRXw=
-github.com/opencoff/go-utils v1.0.2 h1:BANRL8ZxgHpuo8gQBAzT3M9Im3aNFhaWW28jhc86LNs=
-github.com/opencoff/go-utils v1.0.2/go.mod h1:eZkEVQVzNfuE8uGepyhscMsqcXq7liGbBHYYwgYaoy8=
-github.com/opencoff/pflag v1.0.7 h1:o5cQIuX75bDcdJ6AXl68gzpA72a3CJ2MPStaMnEuwi4=
-github.com/opencoff/pflag v1.0.7/go.mod h1:2bXtpAD/5h/2LarkbsRwiUxqnvB1nZBzn9Xjad1P41A=
-github.com/pkg/xattr v0.4.10 h1:Qe0mtiNFHQZ296vRgUjRCoPHPqH7VdTOrZx3g0T+pGA=
-github.com/pkg/xattr v0.4.10/go.mod h1:di8WF84zAKk8jzR1UBTEWh9AUlIZZ7M/JNt8e9B6ktU=
-github.com/planetscale/vtprotobuf v0.6.0 h1:nBeETjudeJ5ZgBHUz1fVHvbqUKnYOXNhsIEabROxmNA=
-github.com/planetscale/vtprotobuf v0.6.0/go.mod h1:t/avpk3KcrXxUnYOhZhMXJlSEyie6gQbtLq5NM3loB8=
-github.com/puzpuzpuz/xsync/v3 v3.5.1 h1:GJYJZwO6IdxN/IKbneznS6yPkVC+c3zyY/j19c++5Fg=
-github.com/puzpuzpuz/xsync/v3 v3.5.1/go.mod h1:VjzYrABPabuM4KyBh1Ftq6u8nhwY5tBPKP9jpmh0nnA=
-golang.org/x/crypto v0.35.0 h1:b15kiHdrGCHrP6LvwaQ3c03kgNhhiMgvlhxHQhmg2Xs=
-golang.org/x/crypto v0.35.0/go.mod h1:dy7dXNW32cAb/6/PRuTNsix8T+vJAqvuIy5Bli/x0YQ=
-golang.org/x/crypto v0.36.0 h1:AnAEvhDddvBdpY+uR+MyHmuZzzNqXSe/GvuDeob5L34=
-golang.org/x/crypto v0.36.0/go.mod h1:Y4J0ReaxCR1IMaabaSMugxJES1EpwhBHhv2bDHklZvc=
-golang.org/x/sys v0.0.0-20220408201424-a24fb2fb8a0f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
-golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/sys v0.31.0 h1:ioabZlmFYtWhL+TRYpcnNlLwhyxaM9kWTDEmfnprqik=
-golang.org/x/sys v0.31.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
-golang.org/x/term v0.29.0 h1:L6pJp37ocefwRRtYPKSWOWzOtWSxVajvz2ldH/xi3iU=
-golang.org/x/term v0.29.0/go.mod h1:6bl4lRlvVuDgSf3179VpIxBF0o10JUpXWOnI7nErv7s=
-golang.org/x/term v0.30.0 h1:PQ39fJZ+mfadBm0y5WlL4vlM7Sx1Hgf13sMIY2+QS9Y=
-golang.org/x/term v0.30.0/go.mod h1:NYYFdzHoI5wRh/h5tDMdMqCqPJZEuNqVR5xJLd/n67g=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-google.golang.org/protobuf v1.36.5 h1:tPhr+woSbjfYvY6/GPufUoYizxw1cF/yFoxJ2fmpwlM=
-google.golang.org/protobuf v1.36.5/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+github.com/opencoff/go-utils v0.0.0-20180228221344-c48e36f0cfc3 h1:IFg/fPDg7NFEGTxTcFcxkdvPd2RQG0u3K8MfWMEamM8=
+github.com/opencoff/go-utils v0.0.0-20180228221344-c48e36f0cfc3/go.mod h1:W/XsuvsMfXD7lUVR2TC408iKFfydI0RkNgkQ33s48gs=
+github.com/opencoff/go-utils v0.1.0 h1:CAEMUIPdlY6Q+8aVKx2cE2btRSOqLzUytOspHin9yS8=
+github.com/opencoff/go-utils v0.1.0/go.mod h1:c+7QUAiCCHcNH6OGvsZ0fviG7cgse8Y3ucg+xy7sGXM=
+github.com/opencoff/pflag v0.2.0 h1:bSI5Qz5W15aCs+4YRDYX6LK5qaUD9GpjZKYP4fli/EY=
+github.com/opencoff/pflag v0.2.0/go.mod h1:mTLzGGUGda1Av3d34iAJlh0JIlRxmFZtmc6qoWPspK0=
+github.com/opencoff/pflag v0.3.3 h1:yohZkwYGPkB34WXvUQzU5GyLhImnjfePDARUaE8me3U=
+github.com/opencoff/pflag v0.3.3/go.mod h1:mTLzGGUGda1Av3d34iAJlh0JIlRxmFZtmc6qoWPspK0=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190618222545-ea8f1a30c443 h1:IcSOAf4PyMp3U3XbIEj1/xJ2BjNN2jWv7JoyOsMxXUU=
+golang.org/x/crypto v0.0.0-20190618222545-ea8f1a30c443/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d h1:+R4KGOnez64A81RvjARKc4UT5/tI9ujCIVX+P5KiHuI=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

internal/pb/hdr.pb.go

@@ -1,258 +0,0 @@
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// versions:
-// 	protoc-gen-go v1.32.0
-// 	protoc        v3.21.12
-// source: internal/pb/hdr.proto
-
-package pb
-
-import (
-	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
-	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-	reflect "reflect"
-	sync "sync"
-)
-
-const (
-	// Verify that this generated code is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
-	// Verify that runtime/protoimpl is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
-)
-
-// Every encrypted file starts with a header describing the
-// Block Size, Salt, Recipient keys etc. Header represents a
-// decoded version of this information. It is encoded in
-// protobuf format before writing to disk.
-type Header struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	ChunkSize uint32        `protobuf:"varint,1,opt,name=chunk_size,json=chunkSize,proto3" json:"chunk_size,omitempty"` // encryption block size
-	Salt      []byte        `protobuf:"bytes,2,opt,name=salt,proto3" json:"salt,omitempty"`                             // master salt (nonces are derived from this)
-	Pk        []byte        `protobuf:"bytes,3,opt,name=pk,proto3" json:"pk,omitempty"`                                 // ephemeral curve PK
-	Sender    []byte        `protobuf:"bytes,4,opt,name=sender,proto3" json:"sender,omitempty"`                         // sender signed artifacts
-	Keys      []*WrappedKey `protobuf:"bytes,5,rep,name=keys,proto3" json:"keys,omitempty"`                             // list of wrapped receiver blocks
-}
-
-func (x *Header) Reset() {
-	*x = Header{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_internal_pb_hdr_proto_msgTypes[0]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *Header) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*Header) ProtoMessage() {}
-
-func (x *Header) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_pb_hdr_proto_msgTypes[0]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use Header.ProtoReflect.Descriptor instead.
-func (*Header) Descriptor() ([]byte, []int) {
-	return file_internal_pb_hdr_proto_rawDescGZIP(), []int{0}
-}
-
-func (x *Header) GetChunkSize() uint32 {
-	if x != nil {
-		return x.ChunkSize
-	}
-	return 0
-}
-
-func (x *Header) GetSalt() []byte {
-	if x != nil {
-		return x.Salt
-	}
-	return nil
-}
-
-func (x *Header) GetPk() []byte {
-	if x != nil {
-		return x.Pk
-	}
-	return nil
-}
-
-func (x *Header) GetSender() []byte {
-	if x != nil {
-		return x.Sender
-	}
-	return nil
-}
-
-func (x *Header) GetKeys() []*WrappedKey {
-	if x != nil {
-		return x.Keys
-	}
-	return nil
-}
-
-// A file encryption key is wrapped by a recipient specific public
-// key. WrappedKey describes such a wrapped key.
-type WrappedKey struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	DKey  []byte `protobuf:"bytes,1,opt,name=d_key,json=dKey,proto3" json:"d_key,omitempty"` // encrypted data key
-	Nonce []byte `protobuf:"bytes,2,opt,name=nonce,proto3" json:"nonce,omitempty"`           // nonce used for encryption
-}
-
-func (x *WrappedKey) Reset() {
-	*x = WrappedKey{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_internal_pb_hdr_proto_msgTypes[1]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *WrappedKey) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*WrappedKey) ProtoMessage() {}
-
-func (x *WrappedKey) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_pb_hdr_proto_msgTypes[1]
-	if protoimpl.UnsafeEnabled && x != nil {
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		if ms.LoadMessageInfo() == nil {
-			ms.StoreMessageInfo(mi)
-		}
-		return ms
-	}
-	return mi.MessageOf(x)
-}
-
-// Deprecated: Use WrappedKey.ProtoReflect.Descriptor instead.
-func (*WrappedKey) Descriptor() ([]byte, []int) {
-	return file_internal_pb_hdr_proto_rawDescGZIP(), []int{1}
-}
-
-func (x *WrappedKey) GetDKey() []byte {
-	if x != nil {
-		return x.DKey
-	}
-	return nil
-}
-
-func (x *WrappedKey) GetNonce() []byte {
-	if x != nil {
-		return x.Nonce
-	}
-	return nil
-}
-
-var File_internal_pb_hdr_proto protoreflect.FileDescriptor
-
-var file_internal_pb_hdr_proto_rawDesc = []byte{
-	0x0a, 0x15, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f, 0x70, 0x62, 0x2f, 0x68, 0x64,
-	0x72, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0x85, 0x01, 0x0a, 0x06, 0x68, 0x65, 0x61, 0x64,
-	0x65, 0x72, 0x12, 0x1d, 0x0a, 0x0a, 0x63, 0x68, 0x75, 0x6e, 0x6b, 0x5f, 0x73, 0x69, 0x7a, 0x65,
-	0x18, 0x01, 0x20, 0x01, 0x28, 0x0d, 0x52, 0x09, 0x63, 0x68, 0x75, 0x6e, 0x6b, 0x53, 0x69, 0x7a,
-	0x65, 0x12, 0x12, 0x0a, 0x04, 0x73, 0x61, 0x6c, 0x74, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0c, 0x52,
-	0x04, 0x73, 0x61, 0x6c, 0x74, 0x12, 0x0e, 0x0a, 0x02, 0x70, 0x6b, 0x18, 0x03, 0x20, 0x01, 0x28,
-	0x0c, 0x52, 0x02, 0x70, 0x6b, 0x12, 0x16, 0x0a, 0x06, 0x73, 0x65, 0x6e, 0x64, 0x65, 0x72, 0x18,
-	0x04, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x06, 0x73, 0x65, 0x6e, 0x64, 0x65, 0x72, 0x12, 0x20, 0x0a,
-	0x04, 0x6b, 0x65, 0x79, 0x73, 0x18, 0x05, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x0c, 0x2e, 0x77, 0x72,
-	0x61, 0x70, 0x70, 0x65, 0x64, 0x5f, 0x6b, 0x65, 0x79, 0x52, 0x04, 0x6b, 0x65, 0x79, 0x73, 0x22,
-	0x38, 0x0a, 0x0b, 0x77, 0x72, 0x61, 0x70, 0x70, 0x65, 0x64, 0x5f, 0x6b, 0x65, 0x79, 0x12, 0x13,
-	0x0a, 0x05, 0x64, 0x5f, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x04, 0x64,
-	0x4b, 0x65, 0x79, 0x12, 0x14, 0x0a, 0x05, 0x6e, 0x6f, 0x6e, 0x63, 0x65, 0x18, 0x02, 0x20, 0x01,
-	0x28, 0x0c, 0x52, 0x05, 0x6e, 0x6f, 0x6e, 0x63, 0x65, 0x42, 0x0d, 0x5a, 0x0b, 0x69, 0x6e, 0x74,
-	0x65, 0x72, 0x6e, 0x61, 0x6c, 0x2f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
-}
-
-var (
-	file_internal_pb_hdr_proto_rawDescOnce sync.Once
-	file_internal_pb_hdr_proto_rawDescData = file_internal_pb_hdr_proto_rawDesc
-)
-
-func file_internal_pb_hdr_proto_rawDescGZIP() []byte {
-	file_internal_pb_hdr_proto_rawDescOnce.Do(func() {
-		file_internal_pb_hdr_proto_rawDescData = protoimpl.X.CompressGZIP(file_internal_pb_hdr_proto_rawDescData)
-	})
-	return file_internal_pb_hdr_proto_rawDescData
-}
-
-var file_internal_pb_hdr_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
-var file_internal_pb_hdr_proto_goTypes = []interface{}{
-	(*Header)(nil),     // 0: header
-	(*WrappedKey)(nil), // 1: wrapped_key
-}
-var file_internal_pb_hdr_proto_depIdxs = []int32{
-	1, // 0: header.keys:type_name -> wrapped_key
-	1, // [1:1] is the sub-list for method output_type
-	1, // [1:1] is the sub-list for method input_type
-	1, // [1:1] is the sub-list for extension type_name
-	1, // [1:1] is the sub-list for extension extendee
-	0, // [0:1] is the sub-list for field type_name
-}
-
-func init() { file_internal_pb_hdr_proto_init() }
-func file_internal_pb_hdr_proto_init() {
-	if File_internal_pb_hdr_proto != nil {
-		return
-	}
-	if !protoimpl.UnsafeEnabled {
-		file_internal_pb_hdr_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Header); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_internal_pb_hdr_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*WrappedKey); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-	}
-	type x struct{}
-	out := protoimpl.TypeBuilder{
-		File: protoimpl.DescBuilder{
-			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
-			RawDescriptor: file_internal_pb_hdr_proto_rawDesc,
-			NumEnums:      0,
-			NumMessages:   2,
-			NumExtensions: 0,
-			NumServices:   0,
-		},
-		GoTypes:           file_internal_pb_hdr_proto_goTypes,
-		DependencyIndexes: file_internal_pb_hdr_proto_depIdxs,
-		MessageInfos:      file_internal_pb_hdr_proto_msgTypes,
-	}.Build()
-	File_internal_pb_hdr_proto = out.File
-	file_internal_pb_hdr_proto_rawDesc = nil
-	file_internal_pb_hdr_proto_goTypes = nil
-	file_internal_pb_hdr_proto_depIdxs = nil
-}

internal/pb/hdr.proto

@@ -1,29 +0,0 @@
-syntax="proto3";
-
-
-option go_package = "internal/pb";
-
-
-/*
- * Every encrypted file starts with a header describing the
- * Block Size, Salt, Recipient keys etc. Header represents a
- * decoded version of this information. It is encoded in
- * protobuf format before writing to disk.
- */
-message header {
-    uint32 chunk_size  = 1; // encryption block size
-    bytes  salt        = 2; // master salt (nonces are derived from this)
-    bytes  pk          = 3; // ephemeral curve PK
-    bytes  sender      = 4; // sender signed artifacts
-    repeated wrapped_key keys  = 5; // list of wrapped receiver blocks
-}
-
-/*
- * A file encryption key is wrapped by a recipient specific public
- * key. WrappedKey describes such a wrapped key.
- */
-message wrapped_key {
-    bytes d_key = 1;    // encrypted data key
-    bytes nonce = 2;    // nonce used for encryption
-}
-

internal/pb/hdr_vtproto.pb.go

@@ -1,512 +0,0 @@
-// Code generated by protoc-gen-go-vtproto. DO NOT EDIT.
-// protoc-gen-go-vtproto version: v0.6.0
-// source: internal/pb/hdr.proto
-
-package pb
-
-import (
-	fmt "fmt"
-	protohelpers "github.com/planetscale/vtprotobuf/protohelpers"
-	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
-	io "io"
-)
-
-const (
-	// Verify that this generated code is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
-	// Verify that runtime/protoimpl is sufficiently up-to-date.
-	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
-)
-
-func (m *Header) MarshalVT() (dAtA []byte, err error) {
-	if m == nil {
-		return nil, nil
-	}
-	size := m.SizeVT()
-	dAtA = make([]byte, size)
-	n, err := m.MarshalToSizedBufferVT(dAtA[:size])
-	if err != nil {
-		return nil, err
-	}
-	return dAtA[:n], nil
-}
-
-func (m *Header) MarshalToVT(dAtA []byte) (int, error) {
-	size := m.SizeVT()
-	return m.MarshalToSizedBufferVT(dAtA[:size])
-}
-
-func (m *Header) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
-	if m == nil {
-		return 0, nil
-	}
-	i := len(dAtA)
-	_ = i
-	var l int
-	_ = l
-	if m.unknownFields != nil {
-		i -= len(m.unknownFields)
-		copy(dAtA[i:], m.unknownFields)
-	}
-	if len(m.Keys) > 0 {
-		for iNdEx := len(m.Keys) - 1; iNdEx >= 0; iNdEx-- {
-			size, err := m.Keys[iNdEx].MarshalToSizedBufferVT(dAtA[:i])
-			if err != nil {
-				return 0, err
-			}
-			i -= size
-			i = protohelpers.EncodeVarint(dAtA, i, uint64(size))
-			i--
-			dAtA[i] = 0x2a
-		}
-	}
-	if len(m.Sender) > 0 {
-		i -= len(m.Sender)
-		copy(dAtA[i:], m.Sender)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Sender)))
-		i--
-		dAtA[i] = 0x22
-	}
-	if len(m.Pk) > 0 {
-		i -= len(m.Pk)
-		copy(dAtA[i:], m.Pk)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Pk)))
-		i--
-		dAtA[i] = 0x1a
-	}
-	if len(m.Salt) > 0 {
-		i -= len(m.Salt)
-		copy(dAtA[i:], m.Salt)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Salt)))
-		i--
-		dAtA[i] = 0x12
-	}
-	if m.ChunkSize != 0 {
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(m.ChunkSize))
-		i--
-		dAtA[i] = 0x8
-	}
-	return len(dAtA) - i, nil
-}
-
-func (m *WrappedKey) MarshalVT() (dAtA []byte, err error) {
-	if m == nil {
-		return nil, nil
-	}
-	size := m.SizeVT()
-	dAtA = make([]byte, size)
-	n, err := m.MarshalToSizedBufferVT(dAtA[:size])
-	if err != nil {
-		return nil, err
-	}
-	return dAtA[:n], nil
-}
-
-func (m *WrappedKey) MarshalToVT(dAtA []byte) (int, error) {
-	size := m.SizeVT()
-	return m.MarshalToSizedBufferVT(dAtA[:size])
-}
-
-func (m *WrappedKey) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
-	if m == nil {
-		return 0, nil
-	}
-	i := len(dAtA)
-	_ = i
-	var l int
-	_ = l
-	if m.unknownFields != nil {
-		i -= len(m.unknownFields)
-		copy(dAtA[i:], m.unknownFields)
-	}
-	if len(m.Nonce) > 0 {
-		i -= len(m.Nonce)
-		copy(dAtA[i:], m.Nonce)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.Nonce)))
-		i--
-		dAtA[i] = 0x12
-	}
-	if len(m.DKey) > 0 {
-		i -= len(m.DKey)
-		copy(dAtA[i:], m.DKey)
-		i = protohelpers.EncodeVarint(dAtA, i, uint64(len(m.DKey)))
-		i--
-		dAtA[i] = 0xa
-	}
-	return len(dAtA) - i, nil
-}
-
-func (m *Header) SizeVT() (n int) {
-	if m == nil {
-		return 0
-	}
-	var l int
-	_ = l
-	if m.ChunkSize != 0 {
-		n += 1 + protohelpers.SizeOfVarint(uint64(m.ChunkSize))
-	}
-	l = len(m.Salt)
-	if l > 0 {
-		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
-	}
-	l = len(m.Pk)
-	if l > 0 {
-		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
-	}
-	l = len(m.Sender)
-	if l > 0 {
-		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
-	}
-	if len(m.Keys) > 0 {
-		for _, e := range m.Keys {
-			l = e.SizeVT()
-			n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
-		}
-	}
-	n += len(m.unknownFields)
-	return n
-}
-
-func (m *WrappedKey) SizeVT() (n int) {
-	if m == nil {
-		return 0
-	}
-	var l int
-	_ = l
-	l = len(m.DKey)
-	if l > 0 {
-		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
-	}
-	l = len(m.Nonce)
-	if l > 0 {
-		n += 1 + l + protohelpers.SizeOfVarint(uint64(l))
-	}
-	n += len(m.unknownFields)
-	return n
-}
-
-func (m *Header) UnmarshalVT(dAtA []byte) error {
-	l := len(dAtA)
-	iNdEx := 0
-	for iNdEx < l {
-		preIndex := iNdEx
-		var wire uint64
-		for shift := uint(0); ; shift += 7 {
-			if shift >= 64 {
-				return protohelpers.ErrIntOverflow
-			}
-			if iNdEx >= l {
-				return io.ErrUnexpectedEOF
-			}
-			b := dAtA[iNdEx]
-			iNdEx++
-			wire |= uint64(b&0x7F) << shift
-			if b < 0x80 {
-				break
-			}
-		}
-		fieldNum := int32(wire >> 3)
-		wireType := int(wire & 0x7)
-		if wireType == 4 {
-			return fmt.Errorf("proto: Header: wiretype end group for non-group")
-		}
-		if fieldNum <= 0 {
-			return fmt.Errorf("proto: Header: illegal tag %d (wire type %d)", fieldNum, wire)
-		}
-		switch fieldNum {
-		case 1:
-			if wireType != 0 {
-				return fmt.Errorf("proto: wrong wireType = %d for field ChunkSize", wireType)
-			}
-			m.ChunkSize = 0
-			for shift := uint(0); ; shift += 7 {
-				if shift >= 64 {
-					return protohelpers.ErrIntOverflow
-				}
-				if iNdEx >= l {
-					return io.ErrUnexpectedEOF
-				}
-				b := dAtA[iNdEx]
-				iNdEx++
-				m.ChunkSize |= uint32(b&0x7F) << shift
-				if b < 0x80 {
-					break
-				}
-			}
-		case 2:
-			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Salt", wireType)
-			}
-			var byteLen int
-			for shift := uint(0); ; shift += 7 {
-				if shift >= 64 {
-					return protohelpers.ErrIntOverflow
-				}
-				if iNdEx >= l {
-					return io.ErrUnexpectedEOF
-				}
-				b := dAtA[iNdEx]
-				iNdEx++
-				byteLen |= int(b&0x7F) << shift
-				if b < 0x80 {
-					break
-				}
-			}
-			if byteLen < 0 {
-				return protohelpers.ErrInvalidLength
-			}
-			postIndex := iNdEx + byteLen
-			if postIndex < 0 {
-				return protohelpers.ErrInvalidLength
-			}
-			if postIndex > l {
-				return io.ErrUnexpectedEOF
-			}
-			m.Salt = append(m.Salt[:0], dAtA[iNdEx:postIndex]...)
-			if m.Salt == nil {
-				m.Salt = []byte{}
-			}
-			iNdEx = postIndex
-		case 3:
-			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Pk", wireType)
-			}
-			var byteLen int
-			for shift := uint(0); ; shift += 7 {
-				if shift >= 64 {
-					return protohelpers.ErrIntOverflow
-				}
-				if iNdEx >= l {
-					return io.ErrUnexpectedEOF
-				}
-				b := dAtA[iNdEx]
-				iNdEx++
-				byteLen |= int(b&0x7F) << shift
-				if b < 0x80 {
-					break
-				}
-			}
-			if byteLen < 0 {
-				return protohelpers.ErrInvalidLength
-			}
-			postIndex := iNdEx + byteLen
-			if postIndex < 0 {
-				return protohelpers.ErrInvalidLength
-			}
-			if postIndex > l {
-				return io.ErrUnexpectedEOF
-			}
-			m.Pk = append(m.Pk[:0], dAtA[iNdEx:postIndex]...)
-			if m.Pk == nil {
-				m.Pk = []byte{}
-			}
-			iNdEx = postIndex
-		case 4:
-			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Sender", wireType)
-			}
-			var byteLen int
-			for shift := uint(0); ; shift += 7 {
-				if shift >= 64 {
-					return protohelpers.ErrIntOverflow
-				}
-				if iNdEx >= l {
-					return io.ErrUnexpectedEOF
-				}
-				b := dAtA[iNdEx]
-				iNdEx++
-				byteLen |= int(b&0x7F) << shift
-				if b < 0x80 {
-					break
-				}
-			}
-			if byteLen < 0 {
-				return protohelpers.ErrInvalidLength
-			}
-			postIndex := iNdEx + byteLen
-			if postIndex < 0 {
-				return protohelpers.ErrInvalidLength
-			}
-			if postIndex > l {
-				return io.ErrUnexpectedEOF
-			}
-			m.Sender = append(m.Sender[:0], dAtA[iNdEx:postIndex]...)
-			if m.Sender == nil {
-				m.Sender = []byte{}
-			}
-			iNdEx = postIndex
-		case 5:
-			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Keys", wireType)
-			}
-			var msglen int
-			for shift := uint(0); ; shift += 7 {
-				if shift >= 64 {
-					return protohelpers.ErrIntOverflow
-				}
-				if iNdEx >= l {
-					return io.ErrUnexpectedEOF
-				}
-				b := dAtA[iNdEx]
-				iNdEx++
-				msglen |= int(b&0x7F) << shift
-				if b < 0x80 {
-					break
-				}
-			}
-			if msglen < 0 {
-				return protohelpers.ErrInvalidLength
-			}
-			postIndex := iNdEx + msglen
-			if postIndex < 0 {
-				return protohelpers.ErrInvalidLength
-			}
-			if postIndex > l {
-				return io.ErrUnexpectedEOF
-			}
-			m.Keys = append(m.Keys, &WrappedKey{})
-			if err := m.Keys[len(m.Keys)-1].UnmarshalVT(dAtA[iNdEx:postIndex]); err != nil {
-				return err
-			}
-			iNdEx = postIndex
-		default:
-			iNdEx = preIndex
-			skippy, err := protohelpers.Skip(dAtA[iNdEx:])
-			if err != nil {
-				return err
-			}
-			if (skippy < 0) || (iNdEx+skippy) < 0 {
-				return protohelpers.ErrInvalidLength
-			}
-			if (iNdEx + skippy) > l {
-				return io.ErrUnexpectedEOF
-			}
-			m.unknownFields = append(m.unknownFields, dAtA[iNdEx:iNdEx+skippy]...)
-			iNdEx += skippy
-		}
-	}
-
-	if iNdEx > l {
-		return io.ErrUnexpectedEOF
-	}
-	return nil
-}
-func (m *WrappedKey) UnmarshalVT(dAtA []byte) error {
-	l := len(dAtA)
-	iNdEx := 0
-	for iNdEx < l {
-		preIndex := iNdEx
-		var wire uint64
-		for shift := uint(0); ; shift += 7 {
-			if shift >= 64 {
-				return protohelpers.ErrIntOverflow
-			}
-			if iNdEx >= l {
-				return io.ErrUnexpectedEOF
-			}
-			b := dAtA[iNdEx]
-			iNdEx++
-			wire |= uint64(b&0x7F) << shift
-			if b < 0x80 {
-				break
-			}
-		}
-		fieldNum := int32(wire >> 3)
-		wireType := int(wire & 0x7)
-		if wireType == 4 {
-			return fmt.Errorf("proto: WrappedKey: wiretype end group for non-group")
-		}
-		if fieldNum <= 0 {
-			return fmt.Errorf("proto: WrappedKey: illegal tag %d (wire type %d)", fieldNum, wire)
-		}
-		switch fieldNum {
-		case 1:
-			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field DKey", wireType)
-			}
-			var byteLen int
-			for shift := uint(0); ; shift += 7 {
-				if shift >= 64 {
-					return protohelpers.ErrIntOverflow
-				}
-				if iNdEx >= l {
-					return io.ErrUnexpectedEOF
-				}
-				b := dAtA[iNdEx]
-				iNdEx++
-				byteLen |= int(b&0x7F) << shift
-				if b < 0x80 {
-					break
-				}
-			}
-			if byteLen < 0 {
-				return protohelpers.ErrInvalidLength
-			}
-			postIndex := iNdEx + byteLen
-			if postIndex < 0 {
-				return protohelpers.ErrInvalidLength
-			}
-			if postIndex > l {
-				return io.ErrUnexpectedEOF
-			}
-			m.DKey = append(m.DKey[:0], dAtA[iNdEx:postIndex]...)
-			if m.DKey == nil {
-				m.DKey = []byte{}
-			}
-			iNdEx = postIndex
-		case 2:
-			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Nonce", wireType)
-			}
-			var byteLen int
-			for shift := uint(0); ; shift += 7 {
-				if shift >= 64 {
-					return protohelpers.ErrIntOverflow
-				}
-				if iNdEx >= l {
-					return io.ErrUnexpectedEOF
-				}
-				b := dAtA[iNdEx]
-				iNdEx++
-				byteLen |= int(b&0x7F) << shift
-				if b < 0x80 {
-					break
-				}
-			}
-			if byteLen < 0 {
-				return protohelpers.ErrInvalidLength
-			}
-			postIndex := iNdEx + byteLen
-			if postIndex < 0 {
-				return protohelpers.ErrInvalidLength
-			}
-			if postIndex > l {
-				return io.ErrUnexpectedEOF
-			}
-			m.Nonce = append(m.Nonce[:0], dAtA[iNdEx:postIndex]...)
-			if m.Nonce == nil {
-				m.Nonce = []byte{}
-			}
-			iNdEx = postIndex
-		default:
-			iNdEx = preIndex
-			skippy, err := protohelpers.Skip(dAtA[iNdEx:])
-			if err != nil {
-				return err
-			}
-			if (skippy < 0) || (iNdEx+skippy) < 0 {
-				return protohelpers.ErrInvalidLength
-			}
-			if (iNdEx + skippy) > l {
-				return io.ErrUnexpectedEOF
-			}
-			m.unknownFields = append(m.unknownFields, dAtA[iNdEx:iNdEx+skippy]...)
-			iNdEx += skippy
-		}
-	}
-
-	if iNdEx > l {
-		return io.ErrUnexpectedEOF
-	}
-	return nil
-}

internal/pb/helpers.go

@@ -1,16 +0,0 @@
-// helper routines to maintain backwards compat with gogo
-
-package pb
-
-
-func (m *Header) Size() int {
-	return m.SizeVT()
-}
-
-func (m *Header) MarshalTo(buf []byte) (int, error) {
-	return m.MarshalToVT(buf)
-}
-
-func (m *Header) Unmarshal(buf []byte) error {
-	return m.UnmarshalVT(buf)
-}

mk-rel.sh

@@ -1,54 +0,0 @@
-#! /usr/bin/env bash
-
-Z=`basename $0`
-die() {
-    echo "$Z: $@" 1>&2
-    exit 1
-}
-
-warn() {
-    echo "$Z: $@" 1>&2
-}
-
-case $BASH_VERSION in
-    4.*|5.*) ;;
-
-    *) die "I need bash 4.x to run!"
-        ;;
-esac
-
-Rel=$PWD/releases
-Bindir=$Rel/bin
-mkdir -p $Bindir || die "can't make $Bindir"
-
-pkgit() {
-    local os=$1
-    local cpu=$2
-    local rev=$3
-    local arch="$os-$cpu"
-    local tgz="$Rel/sigtool-${rev}_${arch}.tar.gz"
-    local bindir=$Bindir/$arch
-    local bin=sigtool
-
-    if [ "$os" = "windows" ]; then
-        bin=${bin}.exe
-    fi
-
-    ./build -V $rev -b $Bindir -s -a $arch || die "can't build $arch"
-    (cd $bindir && tar cf - $bin)  | gzip -9 > $tgz || die "can't tar $tgz"
-}
-
-xrev=$(git describe --always --dirty --abbrev=12) || exit 1
-if echo $xrev | grep -q dirty; then
-    die "won't build releases; repo dirty!"
-    true
-fi
-
-os="linux windows openbsd darwin"
-arch="amd64 arm64"
-
-for xx in $os; do
-    for yy in $arch; do
-        pkgit $xx $yy $xrev
-    done
-done

renovate.json

@@ -1,3 +0,0 @@
-{
-  "$schema": "https://docs.renovatebot.com/renovate-schema.json"
-}

sign/README.md

@@ -1,10 +1,10 @@
-[![GoDoc](https://godoc.org/git.rgst.io/homelab/sigtool/v3/sign?status.svg)](https://godoc.org/git.rgst.io/homelab/sigtool/v3/sign)
+[![GoDoc](https://godoc.org/github.com/opencoff/sigtool/sign?status.svg)](https://godoc.org/github.com/opencoff/sigtool/sign)
 
 # sigtool/sign - Ed25519 signature calculation and verification
 
 This is a small library that makes it easier to create and serialize Ed25519 keys, and sign,
 verify files using those keys. The library uses mmap(2) to read and process very large files.
 
-The companion program [sigtool](https://git.rgst.io/homelab/sigtool/v3) uses this library.
+The companion program [sigtool](https://github.com/opencoff/sigtool) uses this library.
 ## License
 GPL v2.0

sign/doc.go

@@ -1,33 +0,0 @@
-// doc.go -- Documentation for sign & encrypt
-//
-// (c) 2016 Sudhi Herle <sudhi@herle.net>
-//
-// Licensing Terms: GPLv2
-//
-// If you need a commercial license for this work, please contact
-// the author.
-//
-// This software does not come with any express or implied
-// warranty; it is provided "as is". No claim  is made to its
-// suitability for any purpose.
-
-// Package sign implements Ed25519 signing, verification on files.
-// It builds upon golang.org/x/crypto/ed25519 by adding methods
-// for serializing and deserializing Ed25519 private & public keys.
-//
-// It can sign and verify very large files - it prehashes the files
-// with SHA-512 and then signs the SHA-512 checksum. The keys and signatures
-// are YAML files and so, human readable.
-//
-// It can encrypt files for multiple recipients - each of whom is identified
-// by their Ed25519 public key. The encryption by default generates ephmeral
-// Curve25519 keys and creates pair-wise shared secret for each recipient of
-// the encrypted file. The caller can optionally use a specific secret key
-// during the encryption process - this has the benefit of also authenticating
-// the sender (and the receiver can verify the sender if they possess the
-// corresponding public key).
-//
-// The sign, verify, encrypt, decrypt operations can use OpenSSH Ed25519 keys
-// *or* the keys generated by sigtool. This means, you can send encrypted
-// files to any recipient identified by their comment in `~/.ssh/authorized_keys`.
-package sign

sign/encrypt.go

@@ -1,914 +0,0 @@
-// encrypt.go -- Ed25519 based encrypt/decrypt
-//
-// (c) 2016 Sudhi Herle <sudhi@herle.net>
-//
-// Licensing Terms: GPLv2
-//
-// If you need a commercial license for this work, please contact
-// the author.
-//
-// This software does not come with any express or implied
-// warranty; it is provided "as is". No claim  is made to its
-// suitability for any purpose.
-//
-
-// Implementation Notes for Encryption/Decryption:
-//
-// Header: has 3 parts:
-//    - Fixed sized header
-//    - Variable sized protobuf encoded header
-//    - SHA256 sum of both above.
-//
-// Fixed size header:
-//    - Magic: 7 bytes
-//    - Version: 1 byte
-//    - VLen:    4 byte
-//
-// Variable Length Segment:
-//    - Protobuf encoded, per-recipient wrapped keys
-//
-// The variable length segment consists of one or more
-// recipients, each with their individually wrapped keys.
-//
-// The input data is encrypted with an expanded random 32-byte key:
-//    - hkdf-sha512 of random key, salt, context
-//    - the hkdf process yields a data-encryption key, nonce and hmac key.
-//    - we use the header checksum as the 'salt' for HKDF; this ensures that
-//      any modification of the header yields different keys
-//
-// We also calculate the cumulative hmac-sha256 of the plaintext blocks.
-//    - When sender identity is present, we sign the final hmac and append
-//	the signature as the "trailer".
-//    - When sender identity is NOT present, we put random bytes as the
-//      "signature". ie in either case, there is a trailer.
-//
-// Note: If the trailer is missing from a sigtool encrypted file - the
-// recipient has no guarantees of content immutability (ie tampering
-// from one of the _other_ recipients).
-//
-// The input data is broken up into "chunks"; each no larger than
-// maxChunkSize. The default block size is "chunkSize". Each block
-// is AEAD encrypted:
-//   AEAD nonce = header.nonce || block#
-//   AD of AEAD = chunk length+eof marker
-//
-// The encrypted block (includes the AEAD tag) length is written
-// as a big-endian 4-byte prefix. The high-order bit of this length
-// field is set for the last-block (denoting EOF).
-//
-
-package sign
-
-import (
-	"bytes"
-	"crypto/aes"
-	"crypto/cipher"
-	"crypto/ed25519"
-	"crypto/hmac"
-	"crypto/sha256"
-	"crypto/sha512"
-	"crypto/subtle"
-	"encoding/binary"
-	"fmt"
-	"hash"
-	"io"
-	"os"
-
-	"golang.org/x/crypto/curve25519"
-	"golang.org/x/crypto/hkdf"
-
-	"git.rgst.io/homelab/sigtool/v3/internal/pb"
-)
-
-// Encryption chunk size = 4MB
-const (
-	// The latest version of the tool's output file format
-	_SigtoolVersion = 3
-
-	chunkSize    uint32 = 4 * 1048576 // 4 MB
-	maxChunkSize uint32 = 1 << 30
-	_EOF         uint32 = 1 << 31
-
-	_Magic       = "SigTool"
-	_MagicLen    = len(_Magic)
-	_FixedHdrLen = _MagicLen + 1 + 4 // 1: version, 4: len of variable segment
-
-	_AesKeySize    = 32
-	_AEADNonceSize = 12
-	_SaltSize      = 32
-	_RxNonceSize   = 12 // nonce size of per-recipient encrypted blocks
-
-	_WrapReceiver     = "Receiver Key"
-	_WrapSender       = "Sender Sig"
-	_DataKeyExpansion = "Data Key Expansion"
-)
-
-// Encryptor holds the encryption context
-type Encryptor struct {
-	pb.Header
-	key []byte // root key
-
-	nonce []byte // nonce for the data encrypting cipher
-	buf   []byte // I/O buf (chunk-sized)
-
-	ae   cipher.AEAD
-	hmac hash.Hash
-
-	// ephemeral key
-	encSK []byte
-
-	// sender identity
-	sender *PrivateKey
-
-	auth    bool // set if the sender idetity is sent
-	started bool
-	stream  bool
-}
-
-// Create a new Encryption context for encrypting blocks of size 'blksize'.
-// If 'sk' is not nil, authenticate the sender to each receiver.
-func NewEncryptor(sk *PrivateKey, blksize uint64) (*Encryptor, error) {
-	var blksz uint32
-
-	switch {
-	case blksize == 0:
-		blksz = chunkSize
-	case blksize > uint64(maxChunkSize):
-		blksz = maxChunkSize
-	default:
-		blksz = uint32(blksize)
-	}
-
-	// generate ephemeral Curve25519 keys
-	esk, epk, err := newSender()
-	if err != nil {
-		return nil, fmt.Errorf("encrypt: %w", err)
-	}
-
-	key := randBuf(_AesKeySize)
-	salt := randBuf(_SaltSize)
-
-	e := &Encryptor{
-		Header: pb.Header{
-			ChunkSize: blksz,
-			Salt:      salt,
-			Pk:        epk,
-		},
-
-		key:    key,
-		encSK:  esk,
-		sender: sk,
-	}
-
-	if err = e.addSenderSig(sk); err != nil {
-		return nil, fmt.Errorf("encrypt: %w", err)
-	}
-
-	return e, nil
-}
-
-// Add a new recipient to this encryption context.
-func (e *Encryptor) AddRecipient(pk *PublicKey) error {
-	if e.started {
-		return ErrEncStarted
-	}
-
-	w, err := e.wrapKey(pk)
-	if err == nil {
-		e.Keys = append(e.Keys, w)
-	}
-
-	return err
-}
-
-// Encrypt the input stream 'rd' and write encrypted stream to 'wr'
-func (e *Encryptor) Encrypt(rd io.Reader, wr io.WriteCloser) error {
-	if e.stream {
-		return ErrEncIsStream
-	}
-
-	if !e.started {
-		err := e.start(wr)
-		if err != nil {
-			return err
-		}
-	}
-
-	buf := make([]byte, e.ChunkSize)
-
-	var i uint32
-	var eof bool
-	for !eof {
-		n, err := io.ReadAtLeast(rd, buf, int(e.ChunkSize))
-		if err != nil {
-			switch err {
-			case io.EOF, io.ErrClosedPipe, io.ErrUnexpectedEOF:
-				eof = true
-			default:
-				return fmt.Errorf("encrypt: I/O read error: %w", err)
-			}
-		}
-
-		if n >= 0 {
-			err = e.encrypt(buf[:n], wr, i, eof)
-			if err != nil {
-				return err
-			}
-
-			i++
-		}
-	}
-
-	return wr.Close()
-}
-
-// Begin the encryption process by writing the header
-func (e *Encryptor) start(wr io.Writer) error {
-	varSize := e.Size()
-
-	buffer := make([]byte, _FixedHdrLen+varSize+sha256.Size)
-	fixHdr := buffer[:_FixedHdrLen]
-	varHdr := buffer[_FixedHdrLen : _FixedHdrLen+varSize]
-	sumHdr := buffer[_FixedHdrLen+varSize:]
-
-	// Now assemble the fixed header
-	copy(fixHdr[:], []byte(_Magic))
-	fixHdr[_MagicLen] = _SigtoolVersion
-	binary.BigEndian.PutUint32(fixHdr[_MagicLen+1:], uint32(varSize))
-
-	// Now marshal the variable portion
-	_, err := e.MarshalTo(varHdr[:varSize])
-	if err != nil {
-		return fmt.Errorf("encrypt: can't marshal header: %w", err)
-	}
-
-	h := sha256.New()
-	h.Write(buffer[:_FixedHdrLen+varSize])
-	cksum := h.Sum(sumHdr[:0])
-
-	// now make the data encryption keys, nonces etc.
-	outbuf := make([]byte, sha256.Size+_AesKeySize+_AEADNonceSize)
-
-	// we mix the header checksum (and it captures the sigtool version, sender
-	// identity, etc.)
-	buf := expand(outbuf, e.key, cksum, []byte(_DataKeyExpansion))
-
-	var dkey, hmackey []byte
-
-	e.nonce, buf = buf[:_AEADNonceSize], buf[_AEADNonceSize:]
-	dkey, buf = buf[:_AesKeySize], buf[_AesKeySize:]
-	hmackey = buf
-
-	aes, err := aes.NewCipher(dkey)
-	if err != nil {
-		return fmt.Errorf("encrypt: %w", err)
-	}
-
-	if e.ae, err = cipher.NewGCM(aes); err != nil {
-		return fmt.Errorf("encrypt: %w", err)
-	}
-
-	// Finally write out the header
-	err = fullwrite(buffer, wr)
-	if err != nil {
-		return fmt.Errorf("encrypt: %w", err)
-	}
-
-	e.hmac = hmac.New(sha256.New, hmackey)
-	e.buf = make([]byte, e.ChunkSize+4+uint32(e.ae.Overhead()))
-	e.started = true
-
-	debug("encrypt:\n\thdr-cksum: %x\n\taes-key: %x\n\tnonce: %x\n\thmac-key: %x\n",
-		cksum, dkey, e.nonce, hmackey)
-
-	return nil
-}
-
-// encrypt exactly _one_ block of data
-// The nonce is constructed from the salt, block# and block-size.
-// This protects the output stream from re-ordering attacks and length
-// modification attacks. The encoded length & block number is used as
-// additional data in the AEAD construction.
-func (e *Encryptor) encrypt(pt []byte, wr io.Writer, i uint32, eof bool) error {
-	var z uint32 = uint32(len(pt))
-	var nonce [_AEADNonceSize]byte
-
-	// mark last block
-	if eof {
-		z |= _EOF
-	}
-
-	copy(nonce[:], e.nonce)
-
-	// now change the upper bytes to track the block#; we use the len+eof as AD
-	binary.BigEndian.PutUint32(nonce[:4], i)
-
-	// put the encoded length+eof at the start of the output buf
-	b := e.buf[:4]
-	ctbuf := e.buf[4:]
-
-	binary.BigEndian.PutUint32(b, z)
-	ct := e.ae.Seal(ctbuf[:0], nonce[:], pt, b)
-
-	// total number of bytes written
-	n := len(ct) + 4
-	err := fullwrite(e.buf[:n], wr)
-	if err != nil {
-		return fmt.Errorf("encrypt: %w", err)
-	}
-
-	e.hmac.Write(b)
-	e.hmac.Write(pt)
-
-	if eof {
-		return e.writeTrailer(wr)
-	}
-	return nil
-}
-
-// Write a trailer:
-//   - if authenticating sender, sign the hmac and put the signature in the trailer
-//   - if not authenticating sender, write random bytes to the trailer
-func (e *Encryptor) writeTrailer(wr io.Writer) error {
-	var tr []byte
-
-	switch e.auth {
-	case true:
-		var hmac [sha256.Size]byte
-
-		e.hmac.Sum(hmac[:0])
-
-		// We know sender is non null.
-		sig, err := e.sender.SignMessage(hmac[:], "")
-		if err != nil {
-			return fmt.Errorf("encrypt: trailer: %w", err)
-		}
-		tr = sig.Sig
-
-	case false:
-		tr = randBuf(ed25519.SignatureSize)
-
-	}
-
-	if err := fullwrite(tr, wr); err != nil {
-		return fmt.Errorf("encrypt: trailer %w", err)
-	}
-	return nil
-}
-
-// Decryptor holds the decryption context
-type Decryptor struct {
-	pb.Header
-
-	ae   cipher.AEAD
-	hmac hash.Hash
-
-	sender *PublicKey
-
-	rd    io.Reader
-	buf   []byte
-	nonce []byte // nonce for the data decrypting cipher
-
-	key    []byte // Decrypted root key
-	hdrsum []byte // cached header checksum
-	auth   bool   // flag set to true if sender signed the key
-	eof    bool
-	stream bool
-}
-
-// Create a new decryption context and if 'pk' is given, check that it matches
-// the sender
-func NewDecryptor(rd io.Reader) (*Decryptor, error) {
-	var b [_FixedHdrLen]byte
-
-	_, err := io.ReadFull(rd, b[:])
-	if err != nil {
-		return nil, fmt.Errorf("decrypt: err while reading header: %w", err)
-	}
-
-	if bytes.Compare(b[:_MagicLen], []byte(_Magic)) != 0 {
-		return nil, ErrNotSigTool
-	}
-
-	// Version check
-	if b[_MagicLen] != _SigtoolVersion {
-		return nil, fmt.Errorf("decrypt: Unsupported version %d; this tool only supports v%d",
-			b[_MagicLen], _SigtoolVersion)
-	}
-
-	varSize := binary.BigEndian.Uint32(b[_MagicLen+1:])
-
-	// sanity check on variable segment length
-	if varSize > 1048576 {
-		return nil, ErrHeaderTooBig
-	}
-	if varSize < 32 {
-		return nil, ErrHeaderTooSmall
-	}
-
-	// SHA256 is the trailer part of the file-header
-	varBuf := make([]byte, varSize+sha256.Size)
-
-	_, err = io.ReadFull(rd, varBuf)
-	if err != nil {
-		return nil, fmt.Errorf("decrypt: error while reading header: %w", err)
-	}
-
-	// The checksum in the header
-	verify := varBuf[varSize:]
-
-	// the checksum we calculated
-	var csum [sha256.Size]byte
-
-	h := sha256.New()
-	h.Write(b[:])
-	h.Write(varBuf[:varSize])
-	cksum := h.Sum(csum[:0])
-
-	if subtle.ConstantTimeCompare(verify, cksum) == 0 {
-		return nil, ErrBadHeader
-	}
-
-	d := &Decryptor{
-		rd:     rd,
-		hdrsum: cksum,
-	}
-
-	err = d.Unmarshal(varBuf[:varSize])
-	if err != nil {
-		return nil, fmt.Errorf("decrypt: decode error: %w", err)
-	}
-
-	if d.ChunkSize == 0 || d.ChunkSize >= maxChunkSize {
-		return nil, fmt.Errorf("decrypt: invalid chunkSize %d", d.ChunkSize)
-	}
-
-	if len(d.Salt) != _SaltSize {
-		return nil, fmt.Errorf("decrypt: invalid nonce length %d", len(d.Salt))
-	}
-
-	if len(d.Keys) == 0 {
-		return nil, ErrNoWrappedKeys
-	}
-
-	// sanity check on the wrapped keys
-	for i, w := range d.Keys {
-		if len(w.DKey) <= _AesKeySize {
-			return nil, fmt.Errorf("decrypt: wrapped key %d: wrong-size encrypted key", i)
-		}
-	}
-
-	return d, nil
-}
-
-// Use Private Key 'sk' to decrypt the encrypted keys in the header and optionally validate
-// the sender
-func (d *Decryptor) SetPrivateKey(sk *PrivateKey, senderPk *PublicKey) error {
-	var err error
-	var key []byte
-
-	for i, w := range d.Keys {
-		key, err = d.unwrapKey(w, sk)
-		if err != nil {
-			return fmt.Errorf("decrypt: can't unwrap key %d: %w", i, err)
-		}
-		if key != nil {
-			d.key = key
-			d.sender = senderPk
-			goto havekey
-		}
-	}
-
-	return ErrBadKey
-
-havekey:
-	if err := d.verifySender(key, senderPk); err != nil {
-		return fmt.Errorf("decrypt: %w", err)
-	}
-
-	outbuf := make([]byte, sha256.Size+_AesKeySize+_AEADNonceSize)
-
-	buf := expand(outbuf, d.key, d.hdrsum, []byte(_DataKeyExpansion))
-
-	var dkey, hmackey []byte
-
-	d.nonce, buf = buf[:_AEADNonceSize], buf[_AEADNonceSize:]
-	dkey, buf = buf[:_AesKeySize], buf[_AesKeySize:]
-	hmackey = buf
-
-	d.hmac = hmac.New(sha256.New, hmackey)
-
-	aes, err := aes.NewCipher(dkey)
-	if err != nil {
-		return fmt.Errorf("decrypt: %w", err)
-	}
-
-	d.ae, err = cipher.NewGCM(aes)
-	if err != nil {
-		return fmt.Errorf("decrypt: %w", err)
-	}
-
-	debug("decrypt:\n\thdr-cksum: %x\n\taes-key: %x\n\tnonce: %x\n\thmac-key: %x\n",
-		d.hdrsum, dkey, d.nonce, hmackey)
-
-	// We have a separate on-stack buffer for reading the header (4 bytes).
-	// Thus, the actual I/O buf will never be larger than the chunksize + AEAD Overhead
-	d.buf = make([]byte, int(d.ChunkSize)+d.ae.Overhead())
-	return nil
-}
-
-// AuthenticatedSender returns true if the sender authenticated themselves
-// (the data-encryption key is signed).
-func (d *Decryptor) AuthenticatedSender() bool {
-	return d.auth
-}
-
-// Decrypt the file and write to 'wr'
-func (d *Decryptor) Decrypt(wr io.Writer) error {
-	if d.key == nil {
-		return ErrNoKey
-	}
-
-	if d.stream {
-		return ErrDecStarted
-	}
-
-	if d.eof {
-		return io.EOF
-	}
-
-	var i uint32
-	for i = 0; ; i++ {
-		c, eof, err := d.decrypt(i)
-		if err != nil {
-			return err
-		}
-		if len(c) > 0 {
-			err = fullwrite(c, wr)
-			if err != nil {
-				return fmt.Errorf("decrypt: %w", err)
-			}
-		}
-
-		if eof {
-			d.eof = true
-			return nil
-		}
-	}
-}
-
-// Decrypt exactly one chunk of data
-func (d *Decryptor) decrypt(i uint32) ([]byte, bool, error) {
-	var ovh uint32 = uint32(d.ae.Overhead())
-	var b [4]byte
-	var nonce [_AEADNonceSize]byte
-
-	n, err := io.ReadFull(d.rd, b[:])
-	if err != nil || n == 0 {
-		return nil, false, fmt.Errorf("decrypt: premature EOF while reading header block %d", i)
-	}
-
-	m := binary.BigEndian.Uint32(b[:])
-	eof := (m & _EOF) > 0
-	m &= (_EOF - 1)
-
-	// Sanity check - in case of corrupt header
-	switch {
-	case m > uint32(d.ChunkSize):
-		return nil, false, fmt.Errorf("decrypt: chunksize is too large (%d)", m)
-
-	case m == 0:
-		if !eof {
-			return nil, false, fmt.Errorf("decrypt: block %d: zero-sized chunk without EOF", i)
-		}
-		return nil, eof, nil
-
-	default:
-	}
-
-	// make the nonce - top 4 bytes are the counter
-	copy(nonce[:], d.nonce)
-	binary.BigEndian.PutUint32(nonce[:4], i)
-
-	z := m + ovh
-	n, err = io.ReadFull(d.rd, d.buf[:z])
-	if err != nil {
-		return nil, false, fmt.Errorf("decrypt: premature EOF while reading block %d: %w", i, err)
-	}
-
-	pt, err := d.ae.Open(d.buf[:0], nonce[:], d.buf[:n], b[:])
-	if err != nil {
-		return nil, false, fmt.Errorf("decrypt: can't decrypt chunk %d: %w", i, err)
-	}
-
-	if uint32(len(pt)) != m {
-		return nil, false, fmt.Errorf("decrypt: partial unsealed bytes; exp %d, saw %d", m, len(pt))
-	}
-
-	d.hmac.Write(b[:])
-	d.hmac.Write(pt)
-
-	if eof {
-		return d.processTrailer(pt, eof)
-	}
-
-	return pt, eof, nil
-}
-
-func (d *Decryptor) processTrailer(pt []byte, eof bool) ([]byte, bool, error) {
-	var rd [ed25519.SignatureSize]byte
-
-	_, err := io.ReadFull(d.rd, rd[:])
-	if err != nil {
-		return nil, false, fmt.Errorf("decrypt: premature EOF while reading trailer: %w", err)
-	}
-
-	if !d.auth {
-		// these are random bytes; ignore em
-		return pt, eof, nil
-	}
-
-	var hmac [sha256.Size]byte
-
-	cksum := d.hmac.Sum(hmac[:0])
-	ss := &Signature{
-		Sig: rd[:],
-	}
-
-	if ok := d.sender.VerifyMessage(cksum, ss); !ok {
-		return nil, eof, ErrBadTrailer
-	}
-
-	return pt, eof, nil
-}
-
-// optionally sign the checksum and encrypt everything
-func (e *Encryptor) addSenderSig(sk *PrivateKey) error {
-	var zero [ed25519.SignatureSize]byte
-	var auth bool
-	sig := zero[:]
-
-	if e.sender != nil {
-		var csum [sha256.Size]byte
-
-		// We capture essential meta-data from the sender; viz:
-		//  - Sender tool version
-		//  - Sender generated curve25519 PK
-		//  - session salt, root key
-
-		h := sha256.New()
-		h.Write([]byte(_Magic))
-		h.Write([]byte{_SigtoolVersion})
-		h.Write(e.Pk)
-		h.Write(e.Salt)
-		h.Write(e.key)
-		cksum := h.Sum(csum[:0])
-
-		xsig, err := e.sender.SignMessage(cksum, "")
-		if err != nil {
-			return fmt.Errorf("wrap: can't sign: %w", err)
-		}
-		sig = xsig.Sig
-		auth = true
-	}
-
-	buf := make([]byte, _AesKeySize+_AEADNonceSize)
-	buf = expand(buf, e.key, e.Salt, []byte(_WrapSender))
-
-	ekey, nonce := buf[:_AesKeySize], buf[_AesKeySize:]
-
-	aes, err := aes.NewCipher(ekey)
-	if err != nil {
-		return fmt.Errorf("senderId: %w", err)
-	}
-
-	ae, err := cipher.NewGCM(aes)
-	if err != nil {
-		return fmt.Errorf("senderId: %w", err)
-	}
-
-	outbuf := make([]byte, ed25519.SignatureSize+ae.Overhead())
-	buf = ae.Seal(outbuf[:0], nonce, sig, nil)
-
-	e.auth = auth
-	e.Sender = buf
-
-	return nil
-}
-
-// unwrap sender's signature using 'key' and extract the signature
-// Optionally, verify the signature using the sender's PK (if provided).
-func (d *Decryptor) verifySender(key []byte, senderPk *PublicKey) error {
-	outbuf := make([]byte, _AEADNonceSize+_AesKeySize)
-	buf := expand(outbuf, key, d.Salt, []byte(_WrapSender))
-
-	ekey, nonce := buf[:_AesKeySize], buf[_AesKeySize:]
-
-	aes, err := aes.NewCipher(ekey)
-	if err != nil {
-		return fmt.Errorf("unwrap: %w", err)
-	}
-
-	ae, err := cipher.NewGCM(aes)
-	if err != nil {
-		return fmt.Errorf("unwrap: %w", err)
-	}
-
-	var sigbuf [ed25519.SignatureSize]byte
-	var zero [ed25519.SignatureSize]byte
-
-	sig, err := ae.Open(sigbuf[:0], nonce, d.Sender, nil)
-	if err != nil {
-		return fmt.Errorf("unwrap: can't open sender info: %w", err)
-	}
-
-	// Did the sender actually sign anything?
-	if subtle.ConstantTimeCompare(zero[:], sig) == 0 {
-		if senderPk == nil {
-			return ErrNoSenderPK
-		}
-
-		var csum [sha256.Size]byte
-
-		h := sha256.New()
-		h.Write([]byte(_Magic))
-		h.Write([]byte{_SigtoolVersion})
-		h.Write(d.Pk)
-		h.Write(d.Salt)
-		h.Write(key)
-		cksum := h.Sum(csum[:0])
-
-		ss := &Signature{
-			Sig: sig,
-		}
-
-		if ok := senderPk.VerifyMessage(cksum, ss); !ok {
-			return ErrBadSender
-		}
-
-		// we set this to indicate that the sender authenticated themselves;
-		d.auth = true
-	}
-
-	return nil
-}
-
-// Wrap data encryption key 'k' with the sender's PK and our ephemeral curve SK
-//
-//	basically, we do a scalarmult: Ephemeral encryption/decryption SK x receiver PK
-func (e *Encryptor) wrapKey(pk *PublicKey) (*pb.WrappedKey, error) {
-	rxPK := pk.ToCurve25519PK()
-	sekrit, err := curve25519.X25519(e.encSK, rxPK)
-	if err != nil {
-		return nil, fmt.Errorf("wrap: %w", err)
-	}
-
-	var shasum [sha256.Size]byte
-
-	rbuf := randBuf(_RxNonceSize)
-
-	h := sha256.New()
-	h.Write(e.Salt)
-	h.Write(rbuf[:])
-	h.Sum(shasum[:0])
-
-	out := make([]byte, _AesKeySize+_RxNonceSize)
-	buf := expand(out[:], sekrit, shasum[:], []byte(_WrapReceiver))
-
-	kek, nonce := buf[:_AesKeySize], buf[_AesKeySize:]
-
-	aes, err := aes.NewCipher(kek)
-	if err != nil {
-		return nil, fmt.Errorf("wrap: %w", err)
-	}
-
-	ae, err := cipher.NewGCM(aes)
-	if err != nil {
-		return nil, fmt.Errorf("wrap: %w", err)
-	}
-
-	ekey := make([]byte, ae.Overhead()+len(e.key))
-	w := &pb.WrappedKey{
-		DKey:  ae.Seal(ekey[:0], nonce, e.key, pk.Pk),
-		Nonce: rbuf,
-	}
-
-	return w, nil
-}
-
-// Unwrap a wrapped key using the receivers Ed25519 secret key 'sk' and
-// senders ephemeral PublicKey
-func (d *Decryptor) unwrapKey(w *pb.WrappedKey, sk *PrivateKey) ([]byte, error) {
-	ourSK := sk.ToCurve25519SK()
-	sekrit, err := curve25519.X25519(ourSK, d.Pk)
-	if err != nil {
-		return nil, fmt.Errorf("unwrap: %w", err)
-	}
-
-	var shasum [sha256.Size]byte
-
-	h := sha256.New()
-	h.Write(d.Salt)
-	h.Write(w.Nonce)
-	h.Sum(shasum[:0])
-
-	out := make([]byte, _AesKeySize+_RxNonceSize)
-	buf := expand(out[:], sekrit, shasum[:], []byte(_WrapReceiver))
-
-	kek, nonce := buf[:_AesKeySize], buf[_AesKeySize:]
-
-	aes, err := aes.NewCipher(kek)
-	if err != nil {
-		return nil, fmt.Errorf("wrap: %w", err)
-	}
-
-	ae, err := cipher.NewGCM(aes)
-	if err != nil {
-		return nil, fmt.Errorf("wrap: %w", err)
-	}
-
-	want := _AesKeySize + ae.Overhead()
-	if len(w.DKey) != want {
-		return nil, fmt.Errorf("unwrap: incorrect decrypt bytes (need %d, saw %d)", want, len(w.DKey))
-	}
-
-	pk := sk.PublicKey()
-	dkey := make([]byte, _AesKeySize) // decrypted data decryption key
-
-	// we indicate incorrect receiver SK by returning a nil key
-	dkey, err = ae.Open(dkey[:0], nonce, w.DKey, pk.Pk)
-	if err != nil {
-		return nil, nil
-	}
-
-	// we have successfully found the correct recipient
-	return dkey, nil
-}
-
-// Write _all_ bytes of buffer 'buf'
-func fullwrite(buf []byte, wr io.Writer) error {
-	n := len(buf)
-
-	for n > 0 {
-		m, err := wr.Write(buf)
-		if err != nil {
-			return err
-		}
-
-		n -= m
-		buf = buf[m:]
-	}
-	return nil
-}
-
-// generate a KEK from a shared DH key and a Pub Key
-func expand(out []byte, shared, salt, ad []byte) []byte {
-	h := hkdf.New(sha512.New, shared, salt, ad)
-	_, err := io.ReadFull(h, out)
-	if err != nil {
-		panic(fmt.Sprintf("hkdf: failed to generate %d bytes: %s", len(out), err))
-	}
-	return out
-}
-
-func newSender() (sk, pk []byte, err error) {
-	var csk [32]byte
-
-	randRead(csk[:])
-	clamp(csk[:])
-	pk, err = curve25519.X25519(csk[:], curve25519.Basepoint)
-	sk = csk[:]
-	return
-}
-
-// do sha256 on a list of byte slices
-func sha256Slices(v ...[]byte) []byte {
-	h := sha256.New()
-	for _, x := range v {
-		h.Write(x)
-	}
-	return h.Sum(nil)[:]
-}
-
-var _debug int = 0
-
-// Enable debugging of this module;
-// level > 0 elicits debug messages on os.Stderr
-func Debug(level int) {
-	_debug = level
-}
-
-func debug(s string, v ...interface{}) {
-	if _debug <= 0 {
-		return
-	}
-
-	z := fmt.Sprintf(s, v...)
-	if n := len(z); z[n-1] != '\n' {
-		z += "\n"
-	}
-	os.Stderr.WriteString(z)
-	os.Stderr.Sync()
-}
-
-// EOF

sign/encrypt_test.go

@@ -1,477 +0,0 @@
-// crypt_test.go -- Test harness for encrypt/decrypt bits
-//
-// (c) 2016 Sudhi Herle <sudhi@herle.net>
-//
-// Licensing Terms: GPLv2
-//
-// If you need a commercial license for this work, please contact
-// the author.
-//
-// This software does not come with any express or implied
-// warranty; it is provided "as is". No claim  is made to its
-// suitability for any purpose.
-
-package sign
-
-import (
-	"bytes"
-	"crypto/rand"
-	"encoding/binary"
-	"fmt"
-	"io"
-	"testing"
-)
-
-type Buffer struct {
-	bytes.Buffer
-}
-
-func (b *Buffer) Close() error {
-	return nil
-}
-
-// one sender, one receiver no verification of sender
-func TestEncryptSimple(t *testing.T) {
-	assert := newAsserter(t)
-
-	sk, err := NewPrivateKey()
-	assert(err == nil, "SK gen failed: %s", err)
-
-	pk := sk.PublicKey()
-
-	var blkSize int = 1024
-	var size int = (blkSize * 10)
-
-	// cleartext
-	buf := make([]byte, size)
-	for i := 0; i < len(buf); i++ {
-		buf[i] = byte(i & 0xff)
-	}
-
-	ee, err := NewEncryptor(nil, uint64(blkSize))
-	assert(err == nil, "encryptor create fail: %s", err)
-
-	err = ee.AddRecipient(pk)
-	assert(err == nil, "can't add recipient: %s", err)
-
-	rd := bytes.NewBuffer(buf)
-	wr := Buffer{}
-
-	err = ee.Encrypt(rd, &wr)
-	assert(err == nil, "encrypt fail: %s", err)
-
-	rd = bytes.NewBuffer(wr.Bytes())
-
-	dd, err := NewDecryptor(rd)
-	assert(err == nil, "decryptor create fail: %s", err)
-
-	err = dd.SetPrivateKey(sk, nil)
-	assert(err == nil, "decryptor can't add SK: %s", err)
-
-	wr = Buffer{}
-	err = dd.Decrypt(&wr)
-	assert(err == nil, "decrypt fail: %s", err)
-
-	b := wr.Bytes()
-	assert(len(b) == len(buf), "decrypt length mismatch: exp %d, saw %d", len(buf), len(b))
-
-	assert(byteEq(b, buf), "decrypt content mismatch")
-}
-
-// one sender, one receiver - small blocks
-func TestEncryptSmallSizes(t *testing.T) {
-	assert := newAsserter(t)
-
-	sk, err := NewPrivateKey()
-	assert(err == nil, "SK gen failed: %s", err)
-
-	pk := sk.PublicKey()
-
-	var blkSize int = 8
-	var size int = (blkSize * 4)
-
-	// cleartext
-	bigbuf := make([]byte, size)
-	for i := 0; i < len(bigbuf); i++ {
-		bigbuf[i] = byte(i & 0xff)
-	}
-
-	// encrypt progressively larger bufs
-	for i := 1; i < len(bigbuf); i++ {
-		buf := bigbuf[:i]
-
-		ee, err := NewEncryptor(nil, uint64(blkSize))
-		assert(err == nil, "encryptor-%d create fail: %s", i, err)
-
-		err = ee.AddRecipient(pk)
-		assert(err == nil, "encryptor-%d: can't add recipient: %s", i, err)
-
-		rd := bytes.NewBuffer(buf)
-		wr := Buffer{}
-
-		err = ee.Encrypt(rd, &wr)
-		assert(err == nil, "encrypt-%d fail: %s", i, err)
-
-		rd = bytes.NewBuffer(wr.Bytes())
-
-		dd, err := NewDecryptor(rd)
-		assert(err == nil, "decryptor-%d create fail: %s", i, err)
-
-		err = dd.SetPrivateKey(sk, nil)
-		assert(err == nil, "decryptor-%d can't add SK: %s", i, err)
-
-		wr = Buffer{}
-		err = dd.Decrypt(&wr)
-		assert(err == nil, "decrypt-%d fail: %s", i, err)
-
-		b := wr.Bytes()
-		assert(len(b) == len(buf), "decrypt-%d length mismatch: exp %d, saw %d", i, len(buf), len(b))
-
-		assert(byteEq(b, buf), "decrypt-%d content mismatch", i)
-	}
-}
-
-// test corrupted header or corrupted input
-func TestEncryptCorrupted(t *testing.T) {
-	assert := newAsserter(t)
-
-	sk, err := NewPrivateKey()
-	assert(err == nil, "SK gen failed: %s", err)
-
-	pk := sk.PublicKey()
-
-	var blkSize int = 1024
-	var size int = (blkSize * 23) + randmod(blkSize)
-
-	// cleartext
-	buf := make([]byte, size)
-	for i := 0; i < len(buf); i++ {
-		buf[i] = byte(i & 0xff)
-	}
-
-	ee, err := NewEncryptor(nil, uint64(blkSize))
-	assert(err == nil, "encryptor create fail: %s", err)
-
-	err = ee.AddRecipient(pk)
-	assert(err == nil, "can't add recipient: %s", err)
-
-	rd := bytes.NewReader(buf)
-	wr := Buffer{}
-
-	err = ee.Encrypt(rd, &wr)
-	assert(err == nil, "encrypt fail: %s", err)
-
-	rb := wr.Bytes()
-	n := len(rb)
-
-	// corrupt the input
-	for i := 0; i < n; i++ {
-		j := randint() % n
-		rb[j] = byte(randint() & 0xff)
-	}
-
-	rd = bytes.NewReader(rb)
-	dd, err := NewDecryptor(rd)
-	assert(err != nil, "decryptor works on bad input")
-	assert(dd == nil, "decryptor not nil for bad input")
-}
-
-// one sender, one receiver with verification of sender
-func TestEncryptSenderVerified(t *testing.T) {
-	assert := newAsserter(t)
-
-	sender, err := NewPrivateKey()
-	assert(err == nil, "sender SK gen failed: %s", err)
-
-	receiver, err := NewPrivateKey()
-	assert(err == nil, "receiver SK gen failed: %s", err)
-
-	var blkSize int = 1024
-	var size int = (blkSize * 23) + randmod(blkSize)
-
-	// cleartext
-	buf := make([]byte, size)
-	for i := 0; i < len(buf); i++ {
-		buf[i] = byte(i & 0xff)
-	}
-
-	ee, err := NewEncryptor(sender, uint64(blkSize))
-	assert(err == nil, "encryptor create fail: %s", err)
-
-	err = ee.AddRecipient(receiver.PublicKey())
-	assert(err == nil, "can't add recipient: %s", err)
-
-	rd := bytes.NewBuffer(buf)
-	wr := Buffer{}
-
-	err = ee.Encrypt(rd, &wr)
-	assert(err == nil, "encrypt fail: %s", err)
-
-	rd = bytes.NewBuffer(wr.Bytes())
-
-	dd, err := NewDecryptor(rd)
-	assert(err == nil, "decryptor create fail: %s", err)
-
-	randkey, err := NewPrivateKey()
-	assert(err == nil, "rand SK gen failed: %s", err)
-
-	// first send a wrong sender PK
-	err = dd.SetPrivateKey(receiver, randkey.PublicKey())
-	assert(err != nil, "decryptor failed to verify sender")
-
-	// then the correct sender PK
-	err = dd.SetPrivateKey(receiver, sender.PublicKey())
-	assert(err == nil, "decryptor can't add SK: %s", err)
-
-	wr = Buffer{}
-	err = dd.Decrypt(&wr)
-	assert(err == nil, "decrypt fail: %s", err)
-
-	b := wr.Bytes()
-	assert(len(b) == len(buf), "decrypt length mismatch: exp %d, saw %d", len(buf), len(b))
-
-	assert(byteEq(b, buf), "decrypt content mismatch")
-}
-
-// one sender, multiple receivers, each decrypting the blob
-func TestEncryptMultiReceiver(t *testing.T) {
-	assert := newAsserter(t)
-
-	sender, err := NewPrivateKey()
-	assert(err == nil, "sender SK gen failed: %s", err)
-
-	var blkSize int = 1024
-	var size int = (blkSize * 23) + randmod(blkSize)
-
-	// cleartext
-	buf := make([]byte, size)
-	for i := 0; i < len(buf); i++ {
-		buf[i] = byte(i & 0xff)
-	}
-
-	ee, err := NewEncryptor(sender, uint64(blkSize))
-	assert(err == nil, "encryptor create fail: %s", err)
-
-	n := 4
-	rx := make([]*PrivateKey, n)
-	for i := 0; i < n; i++ {
-		r, err := NewPrivateKey()
-		assert(err == nil, "can't make receiver SK %d: %s", i, err)
-		rx[i] = r
-
-		err = ee.AddRecipient(r.PublicKey())
-		assert(err == nil, "can't add recipient %d: %s", i, err)
-	}
-
-	rd := bytes.NewBuffer(buf)
-	wr := Buffer{}
-
-	err = ee.Encrypt(rd, &wr)
-	assert(err == nil, "encrypt fail: %s", err)
-
-	encBytes := wr.Bytes()
-	for i := 0; i < n; i++ {
-		rd = bytes.NewBuffer(encBytes)
-
-		dd, err := NewDecryptor(rd)
-		assert(err == nil, "decryptor %d create fail: %s", i, err)
-
-		err = dd.SetPrivateKey(rx[i], sender.PublicKey())
-		assert(err == nil, "decryptor can't add SK %d: %s", i, err)
-
-		wr = Buffer{}
-		err = dd.Decrypt(&wr)
-		assert(err == nil, "decrypt %d fail: %s", i, err)
-
-		b := wr.Bytes()
-		assert(len(b) == len(buf), "decrypt %d length mismatch: exp %d, saw %d", i, len(buf), len(b))
-
-		assert(byteEq(b, buf), "decrypt %d content mismatch", i)
-	}
-}
-
-// Test stream write and read
-func TestStreamIO(t *testing.T) {
-	assert := newAsserter(t)
-
-	receiver, err := NewPrivateKey()
-	assert(err == nil, "receiver keypair gen failed: %s", err)
-
-	var blkSize int = 1024
-	var size int = (blkSize * 10)
-
-	// cleartext
-	buf := make([]byte, size)
-	for i := 0; i < len(buf); i++ {
-		buf[i] = byte(i & 0xff)
-	}
-
-	ee, err := NewEncryptor(nil, uint64(blkSize))
-	assert(err == nil, "encryptor create fail: %s", err)
-
-	err = ee.AddRecipient(receiver.PublicKey())
-	assert(err == nil, "can't add recipient: %s", err)
-
-	wr := Buffer{}
-	wio, err := ee.NewStreamWriter(&wr)
-	assert(err == nil, "can't start stream writer: %s", err)
-
-	// chunksize for writing to stream
-	csize := 19
-	rbuf := buf
-	for len(rbuf) > 0 {
-		m := csize
-		if len(rbuf) < m {
-			m = len(rbuf)
-		}
-
-		n, err := wio.Write(rbuf[:m])
-		assert(err == nil, "stream write failed: %s", err)
-		assert(n == m, "stream write mismatch: exp %d, saw %d", m, n)
-
-		rbuf = rbuf[m:]
-	}
-	err = wio.Close()
-	assert(err == nil, "stream close failed: %s", err)
-
-	_, err = wio.Write(buf[:csize])
-	assert(err != nil, "stream write accepted I/O after close: %s", err)
-
-	rd := bytes.NewBuffer(wr.Bytes())
-
-	dd, err := NewDecryptor(rd)
-	assert(err == nil, "decryptor create fail: %s", err)
-
-	err = dd.SetPrivateKey(receiver, nil)
-	assert(err == nil, "decryptor can't add SK: %s", err)
-
-	rio, err := dd.NewStreamReader()
-	assert(err == nil, "stream reader failed: %s", err)
-
-	rbuf = make([]byte, csize)
-	wr = Buffer{}
-	n := 0
-	for {
-		m, err := rio.Read(rbuf)
-		assert(err == nil || err == io.EOF, "streamread fail: %s", err)
-
-		if m > 0 {
-			wr.Write(rbuf[:m])
-			n += m
-		}
-		if err == io.EOF || m == 0 {
-			break
-		}
-	}
-
-	b := wr.Bytes()
-	assert(n == len(b), "streamread: bad buflen; exp %d, saw %d", n, len(b))
-	assert(n == len(buf), "streamread: decrypt len mismatch; exp %d, saw %d", len(buf), n)
-
-	assert(byteEq(b, buf), "decrypt content mismatch")
-
-}
-
-// Test stream write and read with small sizes
-func TestSmallSizeStreamIO(t *testing.T) {
-	assert := newAsserter(t)
-
-	receiver, err := NewPrivateKey()
-	assert(err == nil, "receiver SK gen failed: %s", err)
-
-	var blkSize int = 8
-	var size int = blkSize * 10
-
-	// cleartext
-	bigbuf := make([]byte, size)
-	for i := 0; i < len(bigbuf); i++ {
-		bigbuf[i] = byte(i & 0xff)
-	}
-
-	for i := 1; i < len(bigbuf); i++ {
-		buf := bigbuf[:i]
-		t.Logf("small-size-stream: size %d, chunksize %d\n", i, blkSize)
-
-		ee, err := NewEncryptor(nil, uint64(blkSize))
-		assert(err == nil, "encryptor create fail: %s", err)
-
-		err = ee.AddRecipient(receiver.PublicKey())
-		assert(err == nil, "can't add recipient: %s", err)
-
-		wr := Buffer{}
-		wio, err := ee.NewStreamWriter(&wr)
-		assert(err == nil, "can't start stream writer: %s", err)
-
-		// chunksize for writing to stream
-		csize := blkSize - 1
-		rbuf := buf
-		for len(rbuf) > 0 {
-			m := csize
-			if len(rbuf) < m {
-				m = len(rbuf)
-			}
-
-			n, err := wio.Write(rbuf[:m])
-			assert(err == nil, "stream write failed: %s", err)
-			assert(n == m, "stream write mismatch: exp %d, saw %d", m, n)
-
-			rbuf = rbuf[m:]
-		}
-		err = wio.Close()
-		assert(err == nil, "stream close failed: %s", err)
-
-		_, err = wio.Write(buf[:csize])
-		assert(err != nil, "stream write accepted I/O after close: %s", err)
-
-		rd := bytes.NewBuffer(wr.Bytes())
-
-		dd, err := NewDecryptor(rd)
-		assert(err == nil, "decryptor create fail: %s", err)
-
-		err = dd.SetPrivateKey(receiver, nil)
-		assert(err == nil, "decryptor can't add SK: %s", err)
-
-		rio, err := dd.NewStreamReader()
-		assert(err == nil, "stream reader failed: %s", err)
-
-		rbuf = make([]byte, csize)
-		wr = Buffer{}
-		n := 0
-		for {
-			m, err := rio.Read(rbuf)
-			assert(err == nil || err == io.EOF, "streamread fail: %s", err)
-
-			if m > 0 {
-				wr.Write(rbuf[:m])
-				n += m
-			}
-			if err == io.EOF || m == 0 {
-				break
-			}
-		}
-
-		b := wr.Bytes()
-		assert(n == len(b), "streamread: bad buflen; exp %d, saw %d", n, len(b))
-		assert(n == len(buf), "streamread: decrypt len mismatch; exp %d, saw %d", len(buf), n)
-
-		assert(byteEq(b, buf), "decrypt content mismatch")
-	}
-
-}
-
-func randint() int {
-	var b [4]byte
-
-	_, err := io.ReadFull(rand.Reader, b[:])
-	if err != nil {
-		panic(fmt.Sprintf("can't read 4 rand bytes: %s", err))
-	}
-
-	u := binary.BigEndian.Uint32(b[:])
-
-	return int(u & 0x7fffffff)
-}
-
-func randmod(m int) int {
-	return randint() % m
-}

sign/errors.go

@@ -1,45 +0,0 @@
-// errors.go - list of all exportable errors in this module
-//
-// (c) 2016 Sudhi Herle <sudhi@herle.net>
-//
-// Licensing Terms: GPLv2
-//
-// If you need a commercial license for this work, please contact
-// the author.
-//
-// This software does not come with any express or implied
-// warranty; it is provided "as is". No claim  is made to its
-// suitability for any purpose.
-//
-
-package sign
-
-import (
-	"errors"
-)
-
-var (
-	ErrClosed         = errors.New("encrypt: stream already closed")
-	ErrNoKey          = errors.New("decrypt: no private key set for decryption")
-	ErrEncStarted     = errors.New("encrypt: can't add new recipient after encryption has started")
-	ErrDecStarted     = errors.New("decrypt: can't add new recipient after decryption has started")
-	ErrEncIsStream    = errors.New("encrypt: can't use Encrypt() after using streaming I/O")
-	ErrNotSigTool     = errors.New("decrypt: not a sigtool encrypted file?")
-	ErrHeaderTooBig   = errors.New("decrypt: header too large (max 1048576)")
-	ErrHeaderTooSmall = errors.New("decrypt: header too small (min 32)")
-	ErrBadHeader      = errors.New("decrypt: header corrupted")
-	ErrNoWrappedKeys  = errors.New("decrypt: no wrapped keys in encrypted file")
-	ErrBadKey         = errors.New("decrypt: wrong key")
-	ErrBadTrailer     = errors.New("decrypt: message integrity failed (bad trailer)")
-	ErrBadSender      = errors.New("unwrap: sender verification failed")
-	ErrNoSenderPK     = errors.New("unwrap: missing sender public key")
-
-	ErrIncorrectPassword = errors.New("ssh: invalid passphrase")
-	ErrNoPEMFound        = errors.New("ssh: no PEM block found")
-	ErrBadPublicKey      = errors.New("ssh: malformed public key")
-	ErrKeyTooShort       = errors.New("ssh: public key too short")
-	ErrBadTrailers       = errors.New("ssh: trailing junk in public key")
-	ErrBadFormat         = errors.New("ssh: invalid openssh private key format")
-	ErrBadLength         = errors.New("ssh: private key unexpected length")
-	ErrBadPadding        = errors.New("ssh: padding not as expected")
-)

sign/iomisc.go

@@ -1,67 +0,0 @@
-// iomisc.go -- misc i/o functions
-//
-// (c) 2016 Sudhi Herle <sudhi@herle.net>
-//
-// Licensing Terms: GPLv2
-//
-// If you need a commercial license for this work, please contact
-// the author.
-//
-// This software does not come with any express or implied
-// warranty; it is provided "as is". No claim  is made to its
-// suitability for any purpose.
-
-package sign
-
-import (
-	"encoding/binary"
-	"fmt"
-	"github.com/opencoff/go-fio"
-	"github.com/opencoff/go-mmap"
-	"hash"
-	"os"
-)
-
-// Simple function to reliably write data to a file.
-// Does MORE than ioutil.WriteFile() - in that it doesn't trash the
-// existing file with an incomplete write.
-func writeFile(fn string, b []byte, ovwrite bool, mode uint32) error {
-	var opts uint32
-	if ovwrite {
-		opts |= fio.OPT_OVERWRITE
-	}
-	sf, err := fio.NewSafeFile(fn, opts, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, os.FileMode(mode))
-	if err != nil {
-		return err
-	}
-	defer sf.Abort()
-	if _, err = sf.Write(b); err != nil {
-		return err
-	}
-
-	return sf.Close()
-}
-
-// Generate file checksum out of hash function h
-func fileCksum(fn string, h hash.Hash) ([]byte, error) {
-	fd, err := os.Open(fn)
-	if err != nil {
-		return nil, fmt.Errorf("can't open %s: %s", fn, err)
-	}
-
-	defer fd.Close()
-
-	sz, err := mmap.Reader(fd, func(b []byte) error {
-		h.Write(b)
-		return nil
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	var b [8]byte
-	binary.BigEndian.PutUint64(b[:], uint64(sz))
-	h.Write(b[:])
-
-	return h.Sum(nil)[:], nil
-}

sign/keys.go

@@ -1,529 +0,0 @@
-// keys.go -- Ed25519 keys management
-//
-// (c) 2016 Sudhi Herle <sudhi@herle.net>
-//
-// Licensing Terms: GPLv2
-//
-// If you need a commercial license for this work, please contact
-// the author.
-//
-// This software does not come with any express or implied
-// warranty; it is provided "as is". No claim  is made to its
-// suitability for any purpose.
-
-// This file implements:
-//   - key generation, and key I/O
-//   - sign/verify of files and byte strings
-
-package sign
-
-import (
-	"bytes"
-	"crypto/aes"
-	"crypto/cipher"
-	"crypto/rand"
-	"crypto/sha256"
-	"crypto/sha512"
-	"encoding/base64"
-	"fmt"
-	"io/ioutil"
-	"math/big"
-
-	Ed "crypto/ed25519"
-
-	"golang.org/x/crypto/scrypt"
-	"gopkg.in/yaml.v3"
-)
-
-// Private Ed25519 key
-type PrivateKey struct {
-	Sk []byte
-
-	// Encryption key: Curve25519 point corresponding to this Ed25519 key
-	ck []byte
-
-	// Cached copy of the public key
-	pk *PublicKey
-}
-
-// Public Ed25519 key
-type PublicKey struct {
-	Pk []byte
-
-	// Comment string
-	Comment string
-
-	// Curve25519 point corresponding to this Ed25519 key
-	ck []byte
-
-	hash []byte
-}
-
-// Length of Ed25519 Public Key Hash
-const PKHashLength = 16
-
-// constants we use in this module
-const (
-	// Scrypt parameters
-	_N int = 1 << 19
-	_r int = 8
-	_p int = 1
-
-	// Algorithm used in the encrypted private key
-	sk_algo  = "scrypt-sha256"
-	sig_algo = "sha512-ed25519"
-)
-
-// Encrypted Private key
-type serializedPrivKey struct {
-	Comment string `yaml:"comment,omitempty"`
-
-	// Encrypted Sk
-	Esk  string `yaml:"esk"`
-	Salt string `yaml:"salt,omitempty"`
-
-	// Algorithm used for checksum and KDF
-	Algo string `yaml:"algo,omitempty"`
-
-	// These are params for scrypt.Key()
-	// CPU Cost parameter; must be a power of 2
-	N int `yaml:"Z,flow,omitempty"`
-
-	// r * p should be less than 2^30
-	R int `yaml:"r,flow,omitempty"`
-	P int `yaml:"p,flow,omitempty"`
-}
-
-// serialized representation of public key
-type serializedPubKey struct {
-	Comment string `yaml:"comment,omitempty"`
-	Pk      string `yaml:"pk"`
-	Hash    string `yaml:"hash"`
-}
-
-// Serialized signature
-type signature struct {
-	Comment   string `yaml:"comment,omitempty"`
-	Pkhash    string `yaml:"pkhash,omitempty"`
-	Signature string `yaml:"signature"`
-}
-
-// given a public key, generate a deterministic short-hash of it.
-func pkhash(pk []byte) []byte {
-	z := sha256.Sum256(pk)
-	return z[:PKHashLength]
-}
-
-// NewPrivateKey generates a new Ed25519 private key
-func NewPrivateKey() (*PrivateKey, error) {
-	pkb, skb, err := Ed.GenerateKey(rand.Reader)
-	if err != nil {
-		return nil, err
-	}
-
-	sk := &PrivateKey{
-		Sk: []byte(skb),
-		pk: &PublicKey{
-			Pk:   []byte(pkb),
-			hash: pkhash([]byte(pkb)),
-		},
-	}
-	return sk, nil
-}
-
-// Read the private key in 'fn', optionally decrypting it using
-// password 'pw' and create new instance of PrivateKey
-func ReadPrivateKey(fn string, getpw func() ([]byte, error)) (*PrivateKey, error) {
-	yml, err := ioutil.ReadFile(fn)
-	if err != nil {
-		return nil, err
-	}
-
-	var sk PrivateKey
-	if err = sk.UnmarshalBinary(yml, getpw); err != nil {
-		return nil, err
-	}
-	return &sk, nil
-}
-
-// Make a private key from bytes 'yml' using optional caller provided
-// getpw() function to read the password if needed.
-// are assumed to be serialized version of the private key.
-func MakePrivateKey(yml []byte, getpw func() ([]byte, error)) (*PrivateKey, error) {
-	var sk PrivateKey
-
-	err := sk.UnmarshalBinary(yml, getpw)
-	if err != nil {
-		return nil, err
-	}
-	return &sk, nil
-}
-
-// make a PrivateKey from a byte array containing ed25519 raw SK
-func makePrivateKeyFromBytes(sk *PrivateKey, buf []byte) error {
-	if len(buf) != 64 {
-		return fmt.Errorf("private key is malformed (len %d!)", len(buf))
-	}
-
-	skb := make([]byte, 64)
-	copy(skb, buf)
-
-	edsk := Ed.PrivateKey(skb)
-	edpk := edsk.Public().(Ed.PublicKey)
-
-	pk := &PublicKey{
-		Pk:   []byte(edpk),
-		hash: pkhash([]byte(edpk)),
-	}
-	sk.Sk = skb
-	sk.pk = pk
-	return nil
-}
-
-// Make a private key from 64-bytes of extended Ed25519 key
-func PrivateKeyFromBytes(buf []byte) (*PrivateKey, error) {
-	var sk PrivateKey
-	if err := makePrivateKeyFromBytes(&sk, buf); err != nil {
-		return nil, err
-	}
-	return &sk, nil
-}
-
-// Given a secret key, return the corresponding Public Key
-func (sk *PrivateKey) PublicKey() *PublicKey {
-	return sk.pk
-}
-
-// Convert an Ed25519 Private Key to Curve25519 Private key
-func (sk *PrivateKey) ToCurve25519SK() []byte {
-	if sk.ck == nil {
-		var ek [64]byte
-
-		h := sha512.New()
-		h.Write(sk.Sk[:32])
-		h.Sum(ek[:0])
-
-		sk.ck = clamp(ek[:32])
-	}
-
-	return sk.ck
-}
-
-// Serialize the private key to file 'fn' using human readable
-// 'comment' and encrypt the key with supplied passphrase 'pw'.
-func (sk *PrivateKey) Serialize(fn, comment string, ovwrite bool, pw []byte) error {
-	b, err := sk.MarshalBinary(comment, pw)
-	if err == nil {
-		return writeFile(fn, b, ovwrite, 0600)
-	}
-	return err
-}
-
-// MarshalBinary marshals the private key with a caller provided
-// passphrase 'pw' and human readable 'comment'
-func (sk *PrivateKey) MarshalBinary(comment string, pw []byte) ([]byte, error) {
-	// expand the password into 64 bytes
-	pass := sha512.Sum512(pw)
-	salt := make([]byte, 32)
-
-	randRead(salt)
-
-	// "32" == Length of AES-256 key
-	key, err := scrypt.Key(pass[:], salt, _N, _r, _p, 32)
-	if err != nil {
-		return nil, fmt.Errorf("marshal: can't derive scrypt key: %s", err)
-	}
-
-	aes, err := aes.NewCipher(key)
-	if err != nil {
-		return nil, fmt.Errorf("marshal: %s", err)
-	}
-
-	ae, err := cipher.NewGCM(aes)
-	if err != nil {
-		return nil, fmt.Errorf("marshal: %s", err)
-	}
-
-	tl := ae.Overhead()
-	buf := make([]byte, tl+len(sk.Sk))
-	esk := ae.Seal(buf[:0], salt[:ae.NonceSize()], sk.Sk, nil)
-
-	enc := base64.StdEncoding.EncodeToString
-
-	ssk := serializedPrivKey{
-		Comment: comment,
-		Esk:     enc(esk),
-		Salt:    enc(salt),
-		Algo:    sk_algo,
-		N:       _N,
-		R:       _r,
-		P:       _p,
-	}
-
-	// We won't protect the Scrypt parameters with the hash above
-	// because it is not needed. If the parameters are wrong, the
-	// derived key will be wrong and thus, the hash will not match.
-
-	return yaml.Marshal(&ssk)
-}
-
-// UnmarshalBinary unmarshals the private key and optionally invokes the
-// caller provided getpw() function to read the password if needed. If the
-// input byte stream 'b' is an OpenSSH ed25519 key, this function transparently
-// decodes it.
-func (sk *PrivateKey) UnmarshalBinary(b []byte, getpw func() ([]byte, error)) error {
-	if bytes.Index(b, []byte("OPENSSH PRIVATE KEY-")) > 0 {
-		xk, err := parseSSHPrivateKey(b, getpw)
-		if err != nil {
-			return err
-		}
-		*sk = *xk
-		return nil
-	}
-
-	var pw []byte
-	if getpw != nil {
-		var err error
-		pw, err = getpw()
-		if err != nil {
-			return err
-		}
-	}
-
-	// We take short passwords and extend them
-	pwb := sha512.Sum512(pw)
-
-	var ssk serializedPrivKey
-
-	err := yaml.Unmarshal(b, &ssk)
-	if err != nil {
-		return fmt.Errorf("unmarshal priv key: can't parse YAML: %s", err)
-	}
-
-	if len(ssk.Salt) == 0 || len(ssk.Esk) == 0 {
-		return fmt.Errorf("unmarshal priv key: not YAML format")
-	}
-
-	b64 := base64.StdEncoding.DecodeString
-
-	salt, err := b64(ssk.Salt)
-	if err != nil {
-		return fmt.Errorf("unmarshal priv key: can't decode salt: %s", err)
-	}
-
-	esk, err := b64(ssk.Esk)
-	if err != nil {
-		return fmt.Errorf("unmarshal priv key: can't decode key: %s", err)
-	}
-
-	// "32" == Length of AES-256 key
-	key, err := scrypt.Key(pwb[:], salt, ssk.N, ssk.R, ssk.P, 32)
-	if err != nil {
-		return fmt.Errorf("unmarshal priv key: can't derive key: %s", err)
-	}
-
-	aes, err := aes.NewCipher(key)
-	if err != nil {
-		return fmt.Errorf("unmarshal priv key: aes failure: %s", err)
-	}
-
-	ae, err := cipher.NewGCM(aes)
-	if err != nil {
-		return fmt.Errorf("unmarshal priv key: aes failure: %s", err)
-	}
-
-	skb := make([]byte, 64)
-	skb, err = ae.Open(skb[:0], salt[:ae.NonceSize()], esk, nil)
-	if err != nil {
-		return fmt.Errorf("unmarshal priv key: wrong password")
-	}
-
-	return makePrivateKeyFromBytes(sk, skb)
-}
-
-//  --- Public Key Methods ---
-
-// Read the public key from 'fn' and create new instance of
-// PublicKey
-func ReadPublicKey(fn string) (*PublicKey, error) {
-	var err error
-	var yml []byte
-
-	if yml, err = ioutil.ReadFile(fn); err != nil {
-		return nil, err
-	}
-
-	var pk PublicKey
-	if err = pk.UnmarshalBinary(yml); err != nil {
-		return nil, err
-	}
-	return &pk, nil
-}
-
-// Parse a serialized public in 'yml' and return the resulting
-// public key instance
-func MakePublicKey(yml []byte) (*PublicKey, error) {
-	var pk PublicKey
-	if err := pk.UnmarshalBinary(yml); err != nil {
-		return nil, err
-	}
-	return &pk, nil
-}
-
-// Make a public key from a string
-func MakePublicKeyFromString(s string) (*PublicKey, error) {
-	// first try to decode it as a openssh key
-	if pk2, err := parseEncPubKey([]byte(s), "command-line-pk"); err == nil {
-		return pk2, nil
-	}
-
-	// Now try to decode as an sigtool key
-	b64 := base64.StdEncoding.DecodeString
-
-	pkb, err := b64(s)
-	if err != nil {
-		return nil, err
-	}
-
-	var pk PublicKey
-	err = makePublicKeyFromBytes(&pk, pkb)
-	if err != nil {
-		return nil, err
-	}
-	return &pk, nil
-}
-
-func makePublicKeyFromBytes(pk *PublicKey, b []byte) error {
-	if len(b) != 32 {
-		return fmt.Errorf("public key is malformed (len %d!)", len(b))
-	}
-
-	pk.Pk = make([]byte, 32)
-	pk.hash = pkhash(b)
-	copy(pk.Pk, b)
-
-	return nil
-}
-
-// Make a public key from a byte string
-func PublicKeyFromBytes(b []byte) (*PublicKey, error) {
-	var pk PublicKey
-	if err := makePublicKeyFromBytes(&pk, b); err != nil {
-		return nil, err
-	}
-	return &pk, nil
-}
-
-// Serialize a PublicKey into file 'fn' with a human readable 'comment'.
-// If 'ovwrite' is true, overwrite the file if it exists.
-func (pk *PublicKey) Serialize(fn, comment string, ovwrite bool) error {
-	out, err := pk.MarshalBinary(comment)
-	if err == nil {
-		return writeFile(fn, out, ovwrite, 0644)
-	}
-
-	return err
-}
-
-// from github.com/FiloSottile/age
-var curve25519P, _ = new(big.Int).SetString("57896044618658097711785492504343953926634992332820282019728792003956564819949", 10)
-
-// Convert an Ed25519 Public Key to Curve25519 public key
-// from github.com/FiloSottile/age
-func (pk *PublicKey) ToCurve25519PK() []byte {
-	if pk.ck != nil {
-		return pk.ck
-	}
-
-	// ed25519.PublicKey is a little endian representation of the y-coordinate,
-	// with the most significant bit set based on the sign of the x-ccordinate.
-	bigEndianY := make([]byte, Ed.PublicKeySize)
-	for i, b := range pk.Pk {
-		bigEndianY[Ed.PublicKeySize-i-1] = b
-	}
-	bigEndianY[0] &= 0b0111_1111
-
-	// The Montgomery u-coordinate is derived through the bilinear map
-	//
-	//     u = (1 + y) / (1 - y)
-	//
-	// See https://blog.filippo.io/using-ed25519-keys-for-encryption.
-	y := new(big.Int).SetBytes(bigEndianY)
-	denom := big.NewInt(1)
-	denom.ModInverse(denom.Sub(denom, y), curve25519P) // 1 / (1 - y)
-	u := y.Mul(y.Add(y, big.NewInt(1)), denom)
-	u.Mod(u, curve25519P)
-
-	out := make([]byte, 32)
-	uBytes := u.Bytes()
-	n := len(uBytes)
-	for i, b := range uBytes {
-		out[n-i-1] = b
-	}
-
-	pk.ck = out
-	return out
-}
-
-// Public Key Hash
-func (pk *PublicKey) Hash() []byte {
-	return pk.hash
-}
-
-// MarshalBinary marshals a PublicKey into a byte array
-func (pk *PublicKey) MarshalBinary(comment string) ([]byte, error) {
-	b64 := base64.StdEncoding.EncodeToString
-	spk := &serializedPubKey{
-		Comment: comment,
-		Pk:      b64(pk.Pk),
-		Hash:    b64(pk.hash),
-	}
-
-	return yaml.Marshal(spk)
-}
-
-// UnmarshalBinary constructs a PublicKey from a previously
-// marshaled byte stream instance. In addition, it is also
-// capable of parsing an OpenSSH ed25519 public key.
-func (pk *PublicKey) UnmarshalBinary(yml []byte) error {
-
-	// first try to parse as a ssh key
-	if xk, err := parseSSHPublicKey(yml); err == nil {
-		*pk = *xk
-		return nil
-	}
-
-	// OK Yaml it is.
-
-	var spk serializedPubKey
-	var err error
-
-	if err = yaml.Unmarshal(yml, &spk); err != nil {
-		return fmt.Errorf("can't parse YAML: %s", err)
-	}
-
-	if len(spk.Pk) == 0 {
-		return fmt.Errorf("sign: not a YAML public key")
-	}
-
-	b64 := base64.StdEncoding.DecodeString
-	var pkb []byte
-
-	if pkb, err = b64(spk.Pk); err != nil {
-		return fmt.Errorf("can't decode YAML:Pk: %s", err)
-	}
-
-	return makePublicKeyFromBytes(pk, pkb)
-}
-
-// -- Internal Utility Functions --
-
-func clamp(k []byte) []byte {
-	k[0] &= 248
-	k[31] &= 127
-	k[31] |= 64
-	return k
-}
-
-// EOF
-// vim: noexpandtab:ts=8:sw=8:tw=92:

sign/rand.go

@@ -1,45 +0,0 @@
-// rand.go - utility functions to generate random quantities
-//
-// (c) 2018 Sudhi Herle <sudhi@herle.net>
-//
-// Licensing Terms: GPLv2
-//
-// If you need a commercial license for this work, please contact
-// the author.
-//
-// This software does not come with any express or implied
-// warranty; it is provided "as is". No claim  is made to its
-// suitability for any purpose.
-
-package sign
-
-import (
-	"crypto/rand"
-	"encoding/binary"
-	"fmt"
-	"io"
-)
-
-func randu32() uint32 {
-	var b [4]byte
-
-	_, err := io.ReadFull(rand.Reader, b[:])
-	if err != nil {
-		panic(fmt.Sprintf("can't read 4 rand bytes: %s", err))
-	}
-
-	return binary.LittleEndian.Uint32(b[:])
-}
-
-func randRead(b []byte) []byte {
-	_, err := io.ReadFull(rand.Reader, b)
-	if err != nil {
-		panic(fmt.Sprintf("can't read %d bytes of random data: %s", len(b), err))
-	}
-	return b
-}
-
-func randBuf(sz int) []byte {
-	b := make([]byte, sz)
-	return randRead(b)
-}

sign/sign.go

@@ -11,56 +11,309 @@
 // warranty; it is provided "as is". No claim  is made to its
 // suitability for any purpose.
 
-// This file implements:
-//   - key generation, and key I/O
-//   - sign/verify of files and byte strings
-
+// Package sign implements Ed25519 signing, verification on files.
+// It builds upon golang.org/x/crypto/ed25519 by adding methods
+// for serializing and deserializing Ed25519 private & public keys.
+// In addition, it works with large files - by precalculating their
+// SHA512 checksum in mmap'd mode and sending the 64 byte signature
+// for Ed25519 signing.
 package sign
 
 import (
 	"crypto"
 	"crypto/rand"
+	"crypto/sha256"
 	"crypto/sha512"
 	"crypto/subtle"
 	"encoding/base64"
+	"encoding/binary"
 	"fmt"
+	"hash"
 	"io/ioutil"
+	"os"
 
-	Ed "crypto/ed25519"
+	Ed "golang.org/x/crypto/ed25519"
+	"golang.org/x/crypto/scrypt"
+	"gopkg.in/yaml.v2"
 
-	"gopkg.in/yaml.v3"
+	"github.com/opencoff/go-utils"
 )
 
+// Private Ed25519 key
+type PrivateKey struct {
+	Sk []byte
+
+	// Cached copy of the public key
+	// In reality, it is a pointer to Sk[32:]
+	pk []byte
+}
+
+// Public Ed25519 key
+type PublicKey struct {
+	Pk []byte
+}
+
+// Ed25519 key pair
+type Keypair struct {
+	Sec PrivateKey
+	Pub PublicKey
+}
+
 // An Ed25519 Signature
 type Signature struct {
-	Sig    []byte // Ed25519 sig bytes
+	Sig    []byte // 32 byte digital signature
 	pkhash []byte // [0:16] SHA256 hash of public key needed for verification
 }
 
+// Algorithm used in the encrypted private key
+const sk_algo = "scrypt-sha256"
+const sig_algo = "sha512-ed25519"
+
+// Scrypt parameters
+const _N = 1 << 17
+const _r = 16
+const _p = 1
+
+// Encrypted Private key
+type encPrivKey struct {
+	// Encrypted Sk
+	Esk []byte
+
+	// parameters for Sk serialization
+	Salt []byte
+
+	// Algorithm used for checksum and KDF
+	Algo string
+
+	// Checksum to verify passphrase before we xor it
+	Verify []byte
+
+	// These are params for scrypt.Key()
+	// CPU Cost parameter; must be a power of 2
+	N uint32
+	// r * p should be less than 2^30
+	r uint32
+	p uint32
+}
+
+// Serialized representation of private key
+type serializedPrivKey struct {
+	Comment string `yaml:"comment,omitempty"`
+	Esk     string `yaml:"esk"`
+	Salt    string `yaml:"salt,omitempty"`
+	Algo    string `yaml:"algo,omitempty"`
+	Verify  string `yaml:"verify,omitempty"`
+	N       uint32 `yaml:"Z,flow,omitempty"`
+	R       uint32 `yaml:"r,flow,omitempty"`
+	P       uint32 `yaml:"p,flow,omitempty"`
+}
+
+// serialized representation of public key
+type serializedPubKey struct {
+	Comment string `yaml:"comment,omitempty"`
+	Pk      string `yaml:"pk"`
+}
+
+// Serialized signature
+type signature struct {
+	Comment   string `yaml:"comment,omitempty"`
+	Pkhash    string `yaml:"pkhash,omitempty"`
+	Signature string `yaml:"signature"`
+}
+
+// Generate a new Ed25519 keypair
+func NewKeypair() (*Keypair, error) {
+	//kp := &Keypair{Sec: PrivateKey{N: 1 << 17, r: 64, p: 1}}
+	kp := &Keypair{}
+	sk := &kp.Sec
+	pk := &kp.Pub
+
+	p, s, err := Ed.GenerateKey(rand.Reader)
+	if err != nil {
+		return nil, fmt.Errorf("Can't generate Ed25519 keys: %s", err)
+	}
+
+	pk.Pk = []byte(p)
+	sk.Sk = []byte(s)
+
+	return kp, nil
+}
+
+// Serialize the keypair to two separate files. The basename of the
+// file is 'bn'; the public key goes in $bn.pub and the private key
+// goes in $bn.key.
+// If password is non-empty, then the private key is encrypted
+// before writing to disk.
+func (kp *Keypair) Serialize(bn, comment string, pw string) error {
+
+	sk := &kp.Sec
+	pk := &kp.Pub
+
+	skf := fmt.Sprintf("%s.key", bn)
+	pkf := fmt.Sprintf("%s.pub", bn)
+
+	err := pk.serialize(pkf, comment)
+	if err != nil {
+		return fmt.Errorf("Can't serialize to %s: %s", pkf, err)
+	}
+
+	err = sk.serialize(skf, comment, pw)
+	if err != nil {
+		return fmt.Errorf("Can't serialize to %s: %s", pkf, err)
+	}
+
+	return nil
+}
+
+// Read the private key in 'fn', optionally decrypting it using
+// password 'pw' and create new instance of PrivateKey
+func ReadPrivateKey(fn string, pw string) (*PrivateKey, error) {
+	yml, err := ioutil.ReadFile(fn)
+	if err != nil {
+		return nil, err
+	}
+
+	return MakePrivateKey(yml, pw)
+}
+
+// Make a private key from bytes 'yml' and password 'pw'. The bytes
+// are assumed to be serialized version of the private key.
+func MakePrivateKey(yml []byte, pw string) (*PrivateKey, error) {
+	var ssk serializedPrivKey
+
+	err := yaml.Unmarshal(yml, &ssk)
+	if err != nil {
+		return nil, fmt.Errorf("can't parse YAML: %s", err)
+	}
+
+	esk := &encPrivKey{N: ssk.N, r: ssk.R, p: ssk.P, Algo: ssk.Algo}
+	b64 := base64.StdEncoding.DecodeString
+
+	esk.Esk, err = b64(ssk.Esk)
+	if err != nil {
+		return nil, fmt.Errorf("can't decode YAML:Esk: %s", err)
+	}
+
+	esk.Salt, err = b64(ssk.Salt)
+	if err != nil {
+		return nil, fmt.Errorf("can't decode YAML:Salt: %s", err)
+	}
+
+	esk.Verify, err = b64(ssk.Verify)
+	if err != nil {
+		return nil, fmt.Errorf("can't decode YAML:Verify: %s", err)
+	}
+
+	sk := &PrivateKey{}
+
+	// We take short passwords and extend them
+	pwb := sha512.Sum512([]byte(pw))
+
+	xork, err := scrypt.Key(pwb[:], esk.Salt, int(esk.N), int(esk.r), int(esk.p), len(esk.Esk))
+	if err != nil {
+		return nil, fmt.Errorf("can't derive key: %s", err)
+	}
+
+	hh := sha256.New()
+	hh.Write(esk.Salt)
+	hh.Write(xork)
+	ck := hh.Sum(nil)
+
+	if subtle.ConstantTimeCompare(esk.Verify, ck) != 1 {
+		return nil, fmt.Errorf("incorrect private key password")
+	}
+
+	// Everything works. Now, decode the key
+	sk.Sk = make([]byte, len(esk.Esk))
+	for i := 0; i < len(esk.Esk); i++ {
+		sk.Sk[i] = esk.Esk[i] ^ xork[i]
+	}
+
+	return sk, nil
+}
+
+// Serialize the private key to a file
+// Format: YAML
+// All []byte are in base64 (RawEncoding)
+func (sk *PrivateKey) serialize(fn, comment string, pw string) error {
+
+	b64 := base64.StdEncoding.EncodeToString
+	esk := &encPrivKey{}
+	ssk := &serializedPrivKey{Comment: comment}
+
+	// Even with an empty password, we still encrypt and store.
+
+	// expand the password into 64 bytes
+	pwb := sha512.Sum512([]byte(pw))
+
+	esk.N = _N
+	esk.r = _r
+	esk.p = _p
+
+	esk.Salt = make([]byte, 32)
+	esk.Esk = make([]byte, len(sk.Sk))
+
+	_, err := rand.Read(esk.Salt)
+	if err != nil {
+		return fmt.Errorf("Can't read random salt: %s", err)
+	}
+
+	xork, err := scrypt.Key(pwb[:], esk.Salt, int(esk.N), int(esk.r), int(esk.p), len(sk.Sk))
+	if err != nil {
+		return fmt.Errorf("Can't derive scrypt key: %s", err)
+	}
+
+	hh := sha256.New()
+	hh.Write(esk.Salt)
+	hh.Write(xork)
+	esk.Verify = hh.Sum(nil)
+
+	// We won't protect the Scrypt parameters with the hash above
+	// because it is not needed. If the parameters are wrong, the
+	// derived key will be wrong and thus, the hash will not match.
+
+	esk.Algo = sk_algo // global var
+
+	// Finally setup the encrypted key
+	for i := 0; i < len(sk.Sk); i++ {
+		esk.Esk[i] = sk.Sk[i] ^ xork[i]
+	}
+
+	ssk.Esk = b64(esk.Esk)
+	ssk.Salt = b64(esk.Salt)
+	ssk.Verify = b64(esk.Verify)
+	ssk.Algo = esk.Algo
+	ssk.N = esk.N
+	ssk.R = esk.r
+	ssk.P = esk.p
+
+	out, err := yaml.Marshal(ssk)
+	if err != nil {
+		return fmt.Errorf("can't marahal to YAML: %s", err)
+	}
+
+	return writeFile(fn, out, 0600)
+}
+
 // Sign a prehashed Message; return the signature as opaque bytes
 // Signature is an YAML file:
-//
 //    Comment: source file path
 //    Signature: Ed25519 signature
 func (sk *PrivateKey) SignMessage(ck []byte, comment string) (*Signature, error) {
-	h := sha512.New()
-	h.Write([]byte("sigtool signed message"))
-	h.Write(ck)
-	ck = h.Sum(nil)[:]
-
 	x := Ed.PrivateKey(sk.Sk)
+
 	sig, err := x.Sign(rand.Reader, ck, crypto.Hash(0))
 	if err != nil {
 		return nil, fmt.Errorf("can't sign %x: %s", ck, err)
 	}
 
-	ss := &Signature{
-		Sig:    sig,
-		pkhash: make([]byte, len(sk.pk.hash)),
-	}
+	esk := Ed.PrivateKey(sk.Sk) // type cast
+	epk := esk.Public()         // interface
+	xpk := epk.(Ed.PublicKey)   // type assertion
+	pk := []byte(xpk)           // cast
+	pkh := sha256.Sum256(pk)
 
-	copy(ss.pkhash, sk.pk.hash)
-	return ss, nil
+	return &Signature{Sig: sig, pkhash: pkh[:16]}, nil
 }
 
 // Read and sign a file
@@ -88,13 +341,12 @@ func ReadSignature(fn string) (*Signature, error) {
 		return nil, err
 	}
 
-	var sig Signature
-	return makeSignature(&sig, yml)
+	return MakeSignature(yml)
 }
 
 // Parse serialized signature from bytes 'b' and construct a
 // Signature object
-func makeSignature(sig *Signature, b []byte) (*Signature, error) {
+func MakeSignature(b []byte) (*Signature, error) {
 	var ss signature
 	err := yaml.Unmarshal(b, &ss)
 	if err != nil {
@@ -113,33 +365,29 @@ func makeSignature(sig *Signature, b []byte) (*Signature, error) {
 		return nil, fmt.Errorf("can't decode Base64:Pkhash <%s>: %s", ss.Pkhash, err)
 	}
 
-	sig.Sig = s
-	sig.pkhash = p
-	return sig, nil
+	return &Signature{Sig: s, pkhash: p}, nil
 }
 
-// MarshalBinary marshals a signature into a byte stream with
-// an optional caller supplied comment.
-func (sig *Signature) MarshalBinary(comment string) ([]byte, error) {
+// Serialize a signature suitable for storing in durable media
+func (sig *Signature) Serialize(comment string) ([]byte, error) {
+
 	sigs := base64.StdEncoding.EncodeToString(sig.Sig)
 	pks := base64.StdEncoding.EncodeToString(sig.pkhash)
 	ss := &signature{Comment: comment, Pkhash: pks, Signature: sigs}
 
-	return yaml.Marshal(ss)
+	out, err := yaml.Marshal(ss)
+	if err != nil {
+		return nil, fmt.Errorf("can't marshal signature of %x to YAML: %s", sig.Sig, err)
+	}
+
+	return out, nil
 }
 
-// UnmarshalBinary constructs a Signature from a previously
-// serialized bytestream
-func (sig *Signature) UnmarshalBinary(b []byte) error {
-	_, err := makeSignature(sig, b)
-	return err
-}
-
-// Serialize a signature suitable for storing in durable media
-func (sig *Signature) Serialize(fn, comment string, ovwrite bool) error {
-	b, err := sig.MarshalBinary(comment)
+// SerializeFile serializes the signature to an output file 'f'
+func (sig *Signature) SerializeFile(fn, comment string) error {
+	b, err := sig.Serialize(comment)
 	if err == nil {
-		err = writeFile(fn, b, ovwrite, 0644)
+		err = writeFile(fn, b, 0644)
 	}
 	return err
 }
@@ -148,30 +396,146 @@ func (sig *Signature) Serialize(fn, comment string, ovwrite bool) error {
 // the signature. It does this by comparing the hash of 'pk' against
 // 'Pkhash' of 'sig'.
 func (sig *Signature) IsPKMatch(pk *PublicKey) bool {
-	return subtle.ConstantTimeCompare(pk.hash, sig.pkhash) == 1
+	h := sha256.Sum256(pk.Pk)
+	return subtle.ConstantTimeCompare(h[:16], sig.pkhash) == 1
+}
+
+//  --- Public Key Methods ---
+
+// Read the public key from 'fn' and create new instance of
+// PublicKey
+func ReadPublicKey(fn string) (*PublicKey, error) {
+	var err error
+	var yml []byte
+
+	if yml, err = ioutil.ReadFile(fn); err != nil {
+		return nil, err
+	}
+
+	return MakePublicKey(yml)
+}
+
+// Parse a serialized public in 'yml' and return the resulting
+// public key instance
+func MakePublicKey(yml []byte) (*PublicKey, error) {
+	var spk serializedPubKey
+	var err error
+
+	if err = yaml.Unmarshal(yml, &spk); err != nil {
+		return nil, fmt.Errorf("can't parse YAML: %s", err)
+	}
+
+	pk := &PublicKey{}
+	b64 := base64.StdEncoding.DecodeString
+
+	if pk.Pk, err = b64(spk.Pk); err != nil {
+		return nil, fmt.Errorf("can't decode YAML:Pk: %s", err)
+	}
+
+	// Simple sanity checks
+	if len(pk.Pk) == 0 {
+		return nil, fmt.Errorf("public key data is empty?")
+	}
+
+	return pk, nil
+}
+
+// Serialize Public Keys
+func (pk *PublicKey) serialize(fn, comment string) error {
+	b64 := base64.StdEncoding.EncodeToString
+	spk := &serializedPubKey{Comment: comment}
+
+	spk.Pk = b64(pk.Pk)
+
+	out, err := yaml.Marshal(spk)
+	if err != nil {
+		return fmt.Errorf("Can't marahal to YAML: %s", err)
+	}
+
+	return writeFile(fn, out, 0644)
 }
 
 // Verify a signature 'sig' for file 'fn' against public key 'pk'
 // Return True if signature matches, False otherwise
 func (pk *PublicKey) VerifyFile(fn string, sig *Signature) (bool, error) {
+
 	ck, err := fileCksum(fn, sha512.New())
 	if err != nil {
 		return false, err
 	}
 
-	return pk.VerifyMessage(ck, sig), nil
+	return pk.VerifyMessage(ck, sig)
 }
 
 // Verify a signature 'sig' for a pre-calculated checksum 'ck' against public key 'pk'
 // Return True if signature matches, False otherwise
-func (pk *PublicKey) VerifyMessage(ck []byte, sig *Signature) bool {
-	h := sha512.New()
-	h.Write([]byte("sigtool signed message"))
-	h.Write(ck)
-	ck = h.Sum(nil)[:]
+func (pk *PublicKey) VerifyMessage(ck []byte, sig *Signature) (bool, error) {
 
 	x := Ed.PublicKey(pk.Pk)
-	return Ed.Verify(x, ck, sig.Sig)
+	return Ed.Verify(x, ck, sig.Sig), nil
 }
 
+// -- Internal Utility Functions --
+
+// Unlink a file.
+func unlink(f string) {
+	st, err := os.Stat(f)
+	if err == nil {
+		if !st.Mode().IsRegular() {
+			panic(fmt.Sprintf("%s can't be unlinked. Not a regular file?", f))
+		}
+
+		os.Remove(f)
+		return
+	}
+}
+
+// Simple function to reliably write data to a file.
+// Does MORE than ioutil.WriteFile() - in that it doesn't trash the
+// existing file with an incomplete write.
+func writeFile(fn string, b []byte, mode uint32) error {
+	tmp := fmt.Sprintf("%s.tmp", fn)
+	unlink(tmp)
+
+	fd, err := os.OpenFile(tmp, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, os.FileMode(mode))
+	if err != nil {
+		return fmt.Errorf("Can't create file %s: %s", tmp, err)
+	}
+
+	_, err = fd.Write(b)
+	if err != nil {
+		fd.Close()
+		// XXX Do we delete the tmp file?
+		return fmt.Errorf("Can't write %v bytes to %s: %s", len(b), tmp, err)
+	}
+
+	fd.Close() // we ignore close(2) errors; unrecoverable anyway.
+
+	os.Rename(tmp, fn)
+	return nil
+}
+
+// Generate file checksum out of hash function h
+func fileCksum(fn string, h hash.Hash) ([]byte, error) {
+
+	fd, err := os.Open(fn)
+	if err != nil {
+		return nil, fmt.Errorf("can't open %s: %s", fn, err)
+	}
+
+	defer fd.Close()
+
+	sz, err := utils.MmapReader(fd, 0, 0, h)
+	if err != nil {
+		return nil, err
+	}
+
+	var b [8]byte
+	binary.BigEndian.PutUint64(b[:], uint64(sz))
+	h.Write(b[:])
+
+	return h.Sum(nil), nil
+}
+
+// EOF
 // vim: noexpandtab:ts=8:sw=8:tw=92:

sign/sign_test.go

@@ -14,13 +14,40 @@
 package sign
 
 import (
+	"crypto/rand"
+	"crypto/subtle"
 	"fmt"
 	"io/ioutil"
 	"os"
 	"path"
+	"runtime"
 	"testing"
+	// module under test
+	//"github.com/sign"
 )
 
+func newAsserter(t *testing.T) func(cond bool, msg string, args ...interface{}) {
+	return func(cond bool, msg string, args ...interface{}) {
+		if cond {
+			return
+		}
+
+		_, file, line, ok := runtime.Caller(1)
+		if !ok {
+			file = "???"
+			line = 0
+		}
+
+		s := fmt.Sprintf(msg, args...)
+		t.Fatalf("%s: %d: Assertion failed: %s\n", file, line, s)
+	}
+}
+
+// Return true if two byte arrays are equal
+func byteEq(x, y []byte) bool {
+	return subtle.ConstantTimeCompare(x, y) == 1
+}
+
 // Return a temp dir in a temp-dir
 func tempdir(t *testing.T) string {
 	assert := newAsserter(t)
@@ -28,7 +55,7 @@ func tempdir(t *testing.T) string {
 	var b [10]byte
 
 	dn := os.TempDir()
-	randRead(b[:])
+	rand.Read(b[:])
 
 	tmp := path.Join(dn, fmt.Sprintf("%x", b[:]))
 	err := os.MkdirAll(tmp, 0755)
@@ -38,22 +65,6 @@ func tempdir(t *testing.T) string {
 	return tmp
 }
 
-var fixedPw = []byte("abc")
-var badPw = []byte("def")
-var nilPw []byte
-
-// return a hardcoded password
-func hardcodedPw() ([]byte, error) {
-	return fixedPw, nil
-}
-
-func wrongPw() ([]byte, error) {
-	return badPw, nil
-}
-func emptyPw() ([]byte, error) {
-	return nilPw, nil
-}
-
 // Return true if file exists, false otherwise
 func fileExists(fn string) bool {
 	st, err := os.Stat(fn)
@@ -81,109 +92,119 @@ p: 1
 `
 
 // #1. Create new key pair, and read them back.
-func TestSignSimple(t *testing.T) {
+func Test0(t *testing.T) {
 	assert := newAsserter(t)
 
-	sk, err := NewPrivateKey()
-	assert(err == nil, "NewPrivateKey() fail")
+	kp, err := NewKeypair()
+	assert(err == nil, "NewKeyPair() fail")
 
-	pk := sk.PublicKey()
-
-	dn := t.TempDir()
+	dn := tempdir(t)
 	bn := fmt.Sprintf("%s/t0", dn)
 
+	err = kp.Serialize(bn, "", "abc")
+	assert(err == nil, "keyPair.Serialize() fail")
+
 	pkf := fmt.Sprintf("%s.pub", bn)
 	skf := fmt.Sprintf("%s.key", bn)
 
-	err = pk.Serialize(pkf, "", true)
-	assert(err == nil, "can't serialize pk %s", pkf)
-
-	// try to overwrite
-	err = pk.Serialize(pkf, "", false)
-	assert(err != nil, "pk %s overwritten!", pkf)
-
-	err = sk.Serialize(skf, "", true, fixedPw)
-	assert(err == nil, "can't serialize sk %s", skf)
-
-	err = sk.Serialize(skf, "", false, nilPw)
-	assert(err != nil, "sk %s overwritten!", skf)
-
 	// We must find these two files
-	assert(fileExists(pkf), "missing pkf %s", pkf)
-	assert(fileExists(skf), "missing skf %s", skf)
+	assert(fileExists(pkf), "missing pkf")
+	assert(fileExists(skf), "missing skf")
 
-	npk, err := ReadPublicKey(pkf)
+	// send wrong file and see what happens
+	pk, err := ReadPublicKey(skf)
+	assert(err != nil, "bad PK ReadPK fail")
+
+	pk, err = ReadPublicKey(pkf)
 	assert(err == nil, "ReadPK() fail")
 
-	// send the public key as private key
-	nsk, err := ReadPrivateKey(pkf, emptyPw)
-	assert(err != nil, "bad SK ReadSK fail: %s", err)
+	// -ditto- for Sk
+	sk, err := ReadPrivateKey(pkf, "")
+	assert(err != nil, "bad SK ReadSK fail")
 
-	nsk, err = ReadPrivateKey(skf, emptyPw)
-	assert(err != nil, "ReadSK() worked with empty pw")
+	sk, err = ReadPrivateKey(skf, "")
+	assert(err != nil, "ReadSK() empty pw fail")
 
-	nsk, err = ReadPrivateKey(skf, wrongPw)
-	assert(err != nil, "ReadSK() worked with wrong pw")
+	sk, err = ReadPrivateKey(skf, "abcdef")
+	assert(err != nil, "ReadSK() wrong pw fail")
 
 	badf := fmt.Sprintf("%s/badf.key", dn)
 	err = ioutil.WriteFile(badf, []byte(badsk), 0600)
-	assert(err == nil, "can't write badsk: %s", err)
+	assert(err == nil, "write badsk")
 
-	nsk, err = ReadPrivateKey(badf, hardcodedPw)
-	assert(err != nil, "decoded bad SK")
+	sk, err = ReadPrivateKey(badf, "abc")
+	assert(err != nil, "badsk read fail")
 
 	// Finally, with correct password it should work.
-	nsk, err = ReadPrivateKey(skf, hardcodedPw)
-	assert(err == nil, "ReadSK() correct pw fail: %s", err)
+	sk, err = ReadPrivateKey(skf, "abc")
+	assert(err == nil, "ReadSK() correct pw fail")
 
 	// And, deserialized keys should be identical
-	assert(byteEq(pk.Pk, npk.Pk), "pkbytes unequal")
-	assert(byteEq(sk.Sk, nsk.Sk), "skbytes unequal")
+	assert(byteEq(pk.Pk, kp.Pub.Pk), "pkbytes unequal")
+	assert(byteEq(sk.Sk, kp.Sec.Sk), "skbytes unequal")
+
+	os.RemoveAll(dn)
 }
 
 // #2. Create new key pair, sign a rand buffer and verify
-func TestSignRandBuf(t *testing.T) {
+func Test1(t *testing.T) {
 	assert := newAsserter(t)
-
-	sk, err := NewPrivateKey()
-	assert(err == nil, "NewPrivateKey() fail: %s", err)
+	kp, err := NewKeypair()
+	assert(err == nil, "NewKeyPair() fail")
 
 	var ck [64]byte // simulates sha512 sum
 
-	randRead(ck[:])
+	rand.Read(ck[:])
 
-	pk := sk.PublicKey()
+	pk := &kp.Pub
+	sk := &kp.Sec
 
 	ss, err := sk.SignMessage(ck[:], "")
-	assert(err == nil, "sk.sign fail: %s", err)
+	assert(err == nil, "sk.sign fail")
 	assert(ss != nil, "sig is null")
 
 	// verify sig
 	assert(ss.IsPKMatch(pk), "pk match fail")
 
 	// Corrupt the pkhash and see
-	randRead(ss.pkhash)
+	rand.Read(ss.pkhash[:])
 	assert(!ss.IsPKMatch(pk), "corrupt pk match fail")
 
 	// Incorrect checksum == should fail verification
-	ok := pk.VerifyMessage(ck[:16], ss)
+	ok, err := pk.VerifyMessage(ck[:16], ss)
+	assert(err == nil, "bad ck verify err fail")
 	assert(!ok, "bad ck verify fail")
 
 	// proper checksum == should work
-	ok = pk.VerifyMessage(ck[:], ss)
+	ok, err = pk.VerifyMessage(ck[:], ss)
+	assert(err == nil, "verify err")
 	assert(ok, "verify fail")
 
 	// Now sign a file
-	dn := t.TempDir()
+	dn := tempdir(t)
+	bn := fmt.Sprintf("%s/k", dn)
+
+	pkf := fmt.Sprintf("%s.pub", bn)
+	skf := fmt.Sprintf("%s.key", bn)
+
+	err = kp.Serialize(bn, "", "")
+	assert(err == nil, "keyPair.Serialize() fail")
+
+	// Now read the private key and sign
+	sk, err = ReadPrivateKey(skf, "")
+	assert(err == nil, "readSK fail")
+
+	pk, err = ReadPublicKey(pkf)
+	assert(err == nil, "ReadPK fail")
 
 	var buf [8192]byte
 
 	zf := fmt.Sprintf("%s/file.dat", dn)
 	fd, err := os.OpenFile(zf, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
-	assert(err == nil, "file.dat creat file: %s", err)
+	assert(err == nil, "file.dat creat file")
 
 	for i := 0; i < 8; i++ {
-		randRead(buf[:])
+		rand.Read(buf[:])
 		n, err := fd.Write(buf[:])
 		assert(err == nil, fmt.Sprintf("file.dat write fail: %s", err))
 		assert(n == 8192, fmt.Sprintf("file.dat i/o fail: exp 8192 saw %v", n))
@@ -192,31 +213,27 @@ func TestSignRandBuf(t *testing.T) {
 	fd.Close()
 
 	sig, err := sk.SignFile(zf)
-	assert(err == nil, "file.dat sign fail: %s", err)
+	assert(err == nil, "file.dat sign fail")
 	assert(sig != nil, "file.dat sign nil")
 
 	ok, err = pk.VerifyFile(zf, sig)
-	assert(err == nil, "file.dat verify fail: %s", err)
+	assert(err == nil, "file.dat verify fail")
 	assert(ok, "file.dat verify false")
 
 	// Now, serialize the signature and read it back
 	sf := fmt.Sprintf("%s/file.sig", dn)
-	err = sig.Serialize(sf, "", true)
-	assert(err == nil, "sig serialize fail: %s", err)
-
-	// now try to overwrite it
-	err = sig.Serialize(sf, "", false)
-	assert(err != nil, "sig serialize overwrote?!")
+	err = sig.SerializeFile(sf, "")
+	assert(err == nil, "sig serialize fail")
 
 	s2, err := ReadSignature(sf)
-	assert(err == nil, "file.sig read fail: %s", err)
+	assert(err == nil, "file.sig read fail")
 	assert(s2 != nil, "file.sig sig nil")
 
 	assert(byteEq(s2.Sig, sig.Sig), "sig compare fail")
 
 	// If we give a wrong file, verify must fail
 	st, err := os.Stat(zf)
-	assert(err == nil, "file.dat stat fail: %s", err)
+	assert(err == nil, "file.dat stat fail")
 
 	n := st.Size()
 	assert(n == 8192*8, "file.dat size fail")
@@ -224,38 +241,34 @@ func TestSignRandBuf(t *testing.T) {
 	os.Truncate(zf, n-1)
 
 	st, err = os.Stat(zf)
-	assert(err == nil, "file.dat stat2 fail: %s", err)
+	assert(err == nil, "file.dat stat2 fail")
 	assert(st.Size() == (n-1), "truncate fail")
 
 	// Now verify this corrupt file
 	ok, err = pk.VerifyFile(zf, sig)
-	assert(err == nil, "file.dat corrupt i/o fail: %s", err)
+	assert(err == nil, "file.dat corrupt i/o fail")
 	assert(!ok, "file.dat corrupt verify false")
 
 	os.RemoveAll(dn)
 }
 
+
 func Benchmark_Keygen(b *testing.B) {
 	for i := 0; i < b.N; i++ {
-		_, _ = NewPrivateKey()
+		_, _ = NewKeypair()
 	}
 }
 
+
 func Benchmark_Sig(b *testing.B) {
 	var sizes = [...]uint{
 		16,
 		32,
 		64,
-		1024,
-		4096,
-		256 * 1024,
-		1048576,
-		4 * 1048576,
 	}
 
 	b.StopTimer()
-	sk, _ := NewPrivateKey()
-	pk := sk.PublicKey()
+	kp, _ := NewKeypair()
 	var sig *Signature
 	for _, sz := range sizes {
 		buf := randbuf(sz)
@@ -264,12 +277,12 @@ func Benchmark_Sig(b *testing.B) {
 
 		b.ResetTimer()
 
-		b.Run(s0, func(b *testing.B) {
-			sig = benchSign(b, buf, sk)
+		b.Run(s0, func (b *testing.B) {
+			sig = benchSign(b, buf, &kp.Sec)
 		})
 
-		b.Run(s1, func(b *testing.B) {
-			benchVerify(b, buf, sig, pk)
+		b.Run(s1, func (b *testing.B) {
+			benchVerify(b, buf, sig, &kp.Pub)
 		})
 	}
 }
@@ -287,9 +300,10 @@ func benchVerify(b *testing.B, buf []byte, sig *Signature, pk *PublicKey) {
 	}
 }
 
+
 func randbuf(sz uint) []byte {
 	b := make([]byte, sz)
-	randRead(b)
+	rand.Read(b)
 	return b
 }
 

sign/ssh.go

@@ -1,384 +0,0 @@
-// ssh.go - support for reading ssh private and public keys
-//
-// Copyright 2012 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// This file is a bastardization of github.com/ScaleFT/sshkeys and
-// golang.org/x/crypto/ssh/keys.go
-//
-// It is licensed under the terms of the original go source code
-// OR the Apache 2.0 license (terms of sshkeys).
-//
-// Changes from that version:
-//   - don't use password but call a func() to get the password as needed
-//   - narrowly scope the key support for ONLY ed25519 keys
-//   - support reading multiple public keys from authorized_keys
-
-package sign
-
-import (
-	"bytes"
-	"crypto/aes"
-	"crypto/cipher"
-	"crypto/x509"
-	"encoding/base64"
-	"encoding/binary"
-	"encoding/pem"
-	"fmt"
-	"regexp"
-	"strings"
-
-	"github.com/dchest/bcrypt_pbkdf"
-	"golang.org/x/crypto/ed25519"
-	"golang.org/x/crypto/ssh"
-)
-
-const keySizeAES256 = 32
-
-// ParseEncryptedRawPrivateKey returns a private key from an
-// encrypted ed25519 private key.
-func parseSSHPrivateKey(data []byte, getpw func() ([]byte, error)) (*PrivateKey, error) {
-	block, _ := pem.Decode(data)
-	if block == nil {
-		return nil, ErrNoPEMFound
-	}
-
-	if x509.IsEncryptedPEMBlock(block) {
-		return nil, fmt.Errorf("ssh: no support for legacy PEM encrypted keys")
-	}
-
-	switch block.Type {
-	case "OPENSSH PRIVATE KEY":
-		return parseOpenSSHPrivateKey(block.Bytes, getpw)
-	default:
-		return nil, fmt.Errorf("ssh: unsupported key type %q", block.Type)
-	}
-}
-
-func parseSSHPublicKey(in []byte) (*PublicKey, error) {
-	splitter := regexp.MustCompile("[ \\t]+")
-	v := splitter.Split(string(in), -1)
-	if len(v) != 3 {
-		return nil, ErrBadPublicKey
-	}
-
-	return parseEncPubKey([]byte(v[1]), v[2])
-}
-
-// parse a wire encoded public key
-func parseEncPubKey(in []byte, comm string) (*PublicKey, error) {
-	in, err := base64.StdEncoding.DecodeString(string(in))
-	if err != nil {
-		return nil, err
-	}
-
-	algo, in, ok := parseString(in)
-	if !ok {
-		return nil, ErrKeyTooShort
-
-	}
-	if string(algo) != ssh.KeyAlgoED25519 {
-		return nil, nil
-	}
-
-	var w struct {
-		KeyBytes []byte
-		Rest     []byte `ssh:"rest"`
-	}
-
-	if err := ssh.Unmarshal(in, &w); err != nil {
-		return nil, err
-	}
-
-	if len(w.Rest) > 0 {
-		return nil, ErrBadTrailers
-	}
-
-	var pk PublicKey
-
-	if err = makePublicKeyFromBytes(&pk, w.KeyBytes); err == nil {
-		pk.Comment = strings.TrimSpace(comm)
-		return &pk, nil
-	}
-	return nil, err
-}
-
-func parseString(in []byte) (out, rest []byte, ok bool) {
-	if len(in) < 4 {
-		return
-	}
-	length := binary.BigEndian.Uint32(in)
-	in = in[4:]
-	if uint32(len(in)) < length {
-		return
-	}
-	out = in[:length]
-	rest = in[length:]
-	ok = true
-	return
-}
-
-// parseAuthorizedKey parses a public key in OpenSSH binary format and decodes it.
-// removed.
-func parseAuthorizedKey(in []byte) (*PublicKey, error) {
-	in = bytes.TrimSpace(in)
-	i := bytes.IndexAny(in, " \t")
-	if i == -1 {
-		i = len(in)
-	}
-
-	pk, err := parseEncPubKey(in[:i], string(in[i:]))
-	if err != nil {
-		return nil, err
-	}
-
-	return pk, nil
-}
-
-// ParseAuthorizedKeys parses a public key from an authorized_keys
-// file used in OpenSSH according to the sshd(8) manual page.
-func ParseAuthorizedKeys(in []byte) ([]*PublicKey, error) {
-	var pka []*PublicKey
-	var rest []byte
-
-	for len(in) > 0 {
-		end := bytes.IndexByte(in, '\n')
-		if end != -1 {
-			rest = in[end+1:]
-			in = in[:end]
-		} else {
-			rest = nil
-		}
-
-		end = bytes.IndexByte(in, '\r')
-		if end != -1 {
-			in = in[:end]
-		}
-
-		in = bytes.TrimSpace(in)
-		if len(in) == 0 || in[0] == '#' {
-			in = rest
-			continue
-		}
-
-		i := bytes.IndexAny(in, " \t")
-		if i == -1 {
-			in = rest
-			continue
-		}
-
-		if pk, err := parseAuthorizedKey(in[i:]); err == nil {
-			if pk != nil {
-				pka = append(pka, pk)
-			}
-			in = rest
-			continue
-		}
-
-		// No key type recognised. Maybe there's an options field at
-		// the beginning.
-		var b byte
-		inQuote := false
-		var candidateOptions []string
-		optionStart := 0
-		for i, b = range in {
-			isEnd := !inQuote && (b == ' ' || b == '\t')
-			if (b == ',' && !inQuote) || isEnd {
-				if i-optionStart > 0 {
-					candidateOptions = append(candidateOptions, string(in[optionStart:i]))
-				}
-				optionStart = i + 1
-			}
-			if isEnd {
-				break
-			}
-			if b == '"' && (i == 0 || (i > 0 && in[i-1] != '\\')) {
-				inQuote = !inQuote
-			}
-		}
-		for i < len(in) && (in[i] == ' ' || in[i] == '\t') {
-			i++
-		}
-		if i == len(in) {
-			// Invalid line: unmatched quote
-			in = rest
-			continue
-		}
-
-		in = in[i:]
-		i = bytes.IndexAny(in, " \t")
-		if i == -1 {
-			in = rest
-			continue
-		}
-
-		if pk, err := parseAuthorizedKey(in[i:]); err == nil {
-			if pk != nil {
-				pka = append(pka, pk)
-			}
-		}
-
-		in = rest
-		continue
-	}
-
-	return pka, nil
-}
-
-const opensshv1Magic = "openssh-key-v1"
-
-type opensshHeader struct {
-	CipherName   string
-	KdfName      string
-	KdfOpts      string
-	NumKeys      uint32
-	PubKey       string
-	PrivKeyBlock string
-}
-
-type opensshKey struct {
-	Check1  uint32
-	Check2  uint32
-	Keytype string
-	Rest    []byte `ssh:"rest"`
-}
-
-type opensshED25519 struct {
-	Pub     []byte
-	Priv    []byte
-	Comment string
-	Pad     []byte `ssh:"rest"`
-}
-
-func parseOpenSSHPrivateKey(data []byte, getpw func() ([]byte, error)) (*PrivateKey, error) {
-	magic := append([]byte(opensshv1Magic), 0)
-	if !bytes.Equal(magic, data[0:len(magic)]) {
-		return nil, ErrBadFormat
-	}
-	remaining := data[len(magic):]
-
-	w := opensshHeader{}
-
-	if err := ssh.Unmarshal(remaining, &w); err != nil {
-		return nil, err
-	}
-
-	if w.NumKeys != 1 {
-		return nil, fmt.Errorf("ssh: NumKeys must be 1: %d", w.NumKeys)
-	}
-
-	var privateKeyBytes []byte
-	var encrypted bool
-
-	switch {
-	// OpenSSH supports bcrypt KDF w/ AES256-CBC or AES256-CTR mode
-	case w.KdfName == "bcrypt" && w.CipherName == "aes256-cbc":
-		pw, err := getpw()
-		if err != nil {
-			return nil, err
-		}
-		iv, block, err := extractBcryptIvBlock(pw, &w)
-		if err != nil {
-			return nil, err
-		}
-
-		cbc := cipher.NewCBCDecrypter(block, iv)
-		privateKeyBytes = []byte(w.PrivKeyBlock)
-		cbc.CryptBlocks(privateKeyBytes, privateKeyBytes)
-
-		encrypted = true
-
-	case w.KdfName == "bcrypt" && w.CipherName == "aes256-ctr":
-		pw, err := getpw()
-		if err != nil {
-			return nil, err
-		}
-		iv, block, err := extractBcryptIvBlock(pw, &w)
-		if err != nil {
-			return nil, err
-		}
-
-		stream := cipher.NewCTR(block, iv)
-		privateKeyBytes = []byte(w.PrivKeyBlock)
-		stream.XORKeyStream(privateKeyBytes, privateKeyBytes)
-
-		encrypted = true
-
-	case w.KdfName == "none" && w.CipherName == "none":
-		privateKeyBytes = []byte(w.PrivKeyBlock)
-
-	default:
-		return nil, fmt.Errorf("ssh: unknown Cipher/KDF: %s:%s", w.CipherName, w.KdfName)
-	}
-
-	pk1 := opensshKey{}
-
-	if err := ssh.Unmarshal(privateKeyBytes, &pk1); err != nil {
-		if encrypted {
-			return nil, ErrIncorrectPassword
-		}
-		return nil, err
-	}
-
-	if pk1.Check1 != pk1.Check2 {
-		return nil, ErrIncorrectPassword
-	}
-
-	// we only handle ed25519 and rsa keys currently
-	switch pk1.Keytype {
-	case ssh.KeyAlgoED25519:
-		key := opensshED25519{}
-
-		err := ssh.Unmarshal(pk1.Rest, &key)
-		if err != nil {
-			return nil, err
-		}
-
-		if len(key.Priv) != ed25519.PrivateKeySize {
-			return nil, ErrBadLength
-		}
-
-		for i, b := range key.Pad {
-			if int(b) != i+1 {
-				return nil, ErrBadPadding
-			}
-		}
-
-		var sk PrivateKey
-		if err = makePrivateKeyFromBytes(&sk, key.Priv); err == nil {
-			return &sk, nil
-		}
-		return nil, err
-	default:
-		return nil, fmt.Errorf("ssh: unhandled key type: %v", pk1.Keytype)
-	}
-}
-
-func extractBcryptIvBlock(passphrase []byte, w *opensshHeader) ([]byte, cipher.Block, error) {
-	cipherKeylen := keySizeAES256
-	cipherIvLen := aes.BlockSize
-
-	var opts struct {
-		Salt   []byte
-		Rounds uint32
-	}
-
-	if err := ssh.Unmarshal([]byte(w.KdfOpts), &opts); err != nil {
-		return nil, nil, err
-	}
-	kdfdata, err := bcrypt_pbkdf.Key(passphrase, opts.Salt, int(opts.Rounds), cipherKeylen+cipherIvLen)
-	if err != nil {
-		return nil, nil, err
-	}
-
-	iv := kdfdata[cipherKeylen : cipherIvLen+cipherKeylen]
-	aeskey := kdfdata[0:cipherKeylen]
-	block, err := aes.NewCipher(aeskey)
-
-	if err != nil {
-		return nil, nil, err
-	}
-
-	return iv, block, nil
-}

sign/stream.go

@@ -1,162 +0,0 @@
-// stream.go - Streaming io.Reader, io.Writer interface to encryption/decryption
-//
-// (c) 2016 Sudhi Herle <sudhi@herle.net>
-//
-// Licensing Terms: GPLv2
-//
-// If you need a commercial license for this work, please contact
-// the author.
-//
-// This software does not come with any express or implied
-// warranty; it is provided "as is". No claim  is made to its
-// suitability for any purpose.
-//
-
-package sign
-
-import (
-	"io"
-)
-
-// encWriter buffers partial writes until a full chunk is accumulated.
-// It's methods implement the io.WriteCloser interface.
-type encWriter struct {
-	buf []byte
-	n   int // # of bytes written
-	wr  io.WriteCloser
-	e   *Encryptor
-	blk uint32
-	err error
-}
-
-var _ io.WriteCloser = &encWriter{}
-
-// NewStreamWriter begins stream encryption to an underlying destination writer 'wr'.
-// It returns an io.WriteCloser.
-func (e *Encryptor) NewStreamWriter(wr io.WriteCloser) (io.WriteCloser, error) {
-	if !e.started {
-		err := e.start(wr)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	w := &encWriter{
-		buf: make([]byte, e.ChunkSize),
-		wr:  wr,
-		e:   e,
-	}
-
-	e.stream = true
-	return w, nil
-}
-
-// Write implements the io.Writer interface
-func (w *encWriter) Write(b []byte) (int, error) {
-	if w.err != nil {
-		return 0, w.err
-	}
-
-	n := len(b)
-	if n == 0 {
-		return 0, nil
-	}
-
-	max := int(w.e.ChunkSize)
-	for len(b) > 0 {
-		buf := w.buf[w.n:]
-		z := copy(buf, b)
-		b = b[z:]
-		w.n += z
-
-		// We only flush if we have more data remaining in the input buffer.
-		// This way, we don't flush a potentially last block here; that happens
-		// when the caller eventually closes the stream.
-		if w.n == max && len(b) > 0 {
-			w.err = w.e.encrypt(w.buf, w.wr, w.blk, false)
-			if w.err != nil {
-				return 0, w.err
-			}
-
-			w.n = 0
-			w.blk += 1
-		}
-	}
-	return n, nil
-}
-
-// Close implements the io.Close interface
-func (w *encWriter) Close() error {
-	if w.err != nil {
-		return w.err
-	}
-
-	err := w.e.encrypt(w.buf[:w.n], w.wr, w.blk, true)
-	if err != nil {
-		w.err = err
-		return err
-	}
-
-	w.n = 0
-	w.err = ErrClosed
-	return w.wr.Close()
-}
-
-// encReader buffers partial reads and it's methods implement the io.Reader interface.
-type encReader struct {
-	buf    []byte
-	unread []byte
-	d      *Decryptor
-	blk    uint32
-}
-
-var _ io.Reader = &encReader{}
-
-// NewStreamReader returns an io.Reader to read from the decrypted stream
-func (d *Decryptor) NewStreamReader() (io.Reader, error) {
-	if d.key == nil {
-		return nil, ErrNoKey
-	}
-
-	if d.eof {
-		return nil, io.EOF
-	}
-
-	d.stream = true
-	return &encReader{
-		buf: make([]byte, d.ChunkSize),
-		d:   d,
-	}, nil
-}
-
-// Read implements io.Reader interface
-func (r *encReader) Read(b []byte) (int, error) {
-	if r.d.eof && len(r.unread) == 0 {
-		return 0, io.EOF
-	}
-
-	if len(r.unread) > 0 {
-		n := copy(b, r.unread)
-		r.unread = r.unread[n:]
-		return n, nil
-	}
-
-	buf, eof, err := r.d.decrypt(r.blk)
-	if err != nil {
-		return 0, err
-	}
-
-	r.blk += 1
-
-	n := copy(b, buf)
-	buf = buf[n:]
-
-	copy(r.buf, buf)
-	r.unread = r.buf[:len(buf)]
-
-	if eof {
-		r.d.eof = true
-	}
-
-	return n, nil
-}

sign/utils_test.go

@@ -1,43 +0,0 @@
-// utils_test.go -- Test harness utilities for sign
-//
-// (c) 2016 Sudhi Herle <sudhi@herle.net>
-//
-// Licensing Terms: GPLv2
-//
-// If you need a commercial license for this work, please contact
-// the author.
-//
-// This software does not come with any express or implied
-// warranty; it is provided "as is". No claim  is made to its
-// suitability for any purpose.
-
-package sign
-
-import (
-	"crypto/subtle"
-	"fmt"
-	"runtime"
-	"testing"
-)
-
-func newAsserter(t *testing.T) func(cond bool, msg string, args ...interface{}) {
-	return func(cond bool, msg string, args ...interface{}) {
-		if cond {
-			return
-		}
-
-		_, file, line, ok := runtime.Caller(1)
-		if !ok {
-			file = "???"
-			line = 0
-		}
-
-		s := fmt.Sprintf(msg, args...)
-		t.Fatalf("%s: %d: Assertion failed: %s\n", file, line, s)
-	}
-}
-
-// Return true if two byte arrays are equal
-func byteEq(x, y []byte) bool {
-	return subtle.ConstantTimeCompare(x, y) == 1
-}

sigtool.go

@@ -0,0 +1,333 @@
+// sigtool.go -- Tool to generate, manage Ed25519 keys and
+// signatures.
+//
+// (c) 2016 Sudhi Herle <sudhi@herle.net>
+//
+// Licensing Terms: GPLv2
+//
+// If you need a commercial license for this work, please contact
+// the author.
+//
+// This software does not come with any express or implied
+// warranty; it is provided "as is". No claim  is made to its
+// suitability for any purpose.
+
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path"
+
+	"github.com/opencoff/go-utils"
+	flag "github.com/opencoff/pflag"
+	"github.com/opencoff/sigtool/sign"
+)
+
+// This will be filled in by "build"
+var Version string = "1.1"
+
+var Z string = path.Base(os.Args[0])
+
+func main() {
+
+	var ver, help bool
+
+	mf := flag.NewFlagSet(Z, flag.ExitOnError)
+	mf.SetInterspersed(false)
+	mf.BoolVarP(&ver, "version", "v", false, "Show version info and exit")
+	mf.BoolVarP(&help, "help", "h", false, "Show help info exit")
+	mf.Parse(os.Args[1:])
+
+	if ver {
+		fmt.Printf("%s: %s\n", Z, Version)
+		os.Exit(0)
+	}
+
+	if help {
+		usage(0)
+	}
+
+	args := mf.Args()
+	if len(args) < 1 {
+		warn("Insufficient arguments. Try '%s -h'", Z)
+		os.Exit(1)
+	}
+
+	switch args[0] {
+	case "gen", "generate", "g":
+		gen(args[1:])
+
+	case "sign", "s":
+		signify(args[1:])
+
+	case "verify", "v":
+		verify(args[1:])
+
+	case "help", "":
+		usage(0)
+
+	default:
+		die("Unknown command %s", args[0])
+	}
+}
+
+// Run the generate command
+func gen(args []string) {
+
+	var pw, help, force bool
+	var comment string
+	var envpw string
+
+	fs := flag.NewFlagSet("generate", flag.ExitOnError)
+	fs.BoolVarP(&help, "help", "h", false, "Show this help and exit")
+	fs.BoolVarP(&pw, "password", "p", false, "Ask for passphrase to encrypt the private key")
+	fs.StringVarP(&comment, "comment", "c", "", "Use `C` as the text comment for the keys")
+	fs.StringVarP(&envpw, "env-password", "E", "", "Use passphrase from environment variable `E`")
+	fs.BoolVarP(&force, "force", "F", false, "Overwrite the output file if it exists")
+
+	fs.Parse(args)
+
+	if help {
+		fs.SetOutput(os.Stdout)
+		fmt.Printf(`%s generate|gen|g [options] file-prefix
+
+Generate a new Ed25519 public+private key pair and write public key to
+FILE-PREFIX.pub and private key to FILE-PREFIX.key.
+
+Options:
+`, Z)
+		fs.PrintDefaults()
+		os.Exit(0)
+	}
+
+	args = fs.Args()
+	if len(args) < 1 {
+		die("Insufficient arguments to 'generate'. Try '%s generate -h' ..", Z)
+	}
+
+	bn := args[0]
+
+	if exists(bn) && !force {
+		die("Public/Private key files (%s.key, %s.pub) exist. Won't overwrite!", bn, bn)
+	}
+
+	var pws string
+	var err error
+
+	if len(envpw) > 0 {
+		pws = os.Getenv(envpw)
+	} else if pw {
+		pws, err = utils.Askpass("Enter passphrase for private key", true)
+		if err != nil {
+			die("%s", err)
+		}
+	}
+
+	kp, err := sign.NewKeypair()
+	if err != nil {
+		die("%s", err)
+	}
+
+	err = kp.Serialize(bn, comment, pws)
+	if err != nil {
+		die("%s", err)
+	}
+}
+
+// Run the 'sign' command.
+func signify(args []string) {
+	var pw, help bool
+	var output string
+	var envpw string
+
+	fs := flag.NewFlagSet("sign", flag.ExitOnError)
+	fs.BoolVarP(&help, "help", "h", false, "Show this help and exit")
+	fs.BoolVarP(&pw, "password", "p", false, "Ask for passphrase to decrypt the private key")
+	fs.StringVarP(&envpw, "env-password", "E", "", "Use passphrase from environment variable `E`")
+	fs.StringVarP(&output, "output", "o", "", "Write signature to file `F`")
+
+	fs.Parse(args)
+
+	if help {
+		fs.SetOutput(os.Stdout)
+		fmt.Printf(`%s sign|s [options] privkey file
+
+Sign FILE with a Ed25519 private key PRIVKEY and write signature to FILE.sig
+
+Options:
+`, Z)
+		fs.PrintDefaults()
+		os.Exit(0)
+	}
+
+	args = fs.Args()
+	if len(args) < 2 {
+		die("Insufficient arguments to 'sign'. Try '%s sign -h' ..", Z)
+	}
+
+	kn := args[0]
+	fn := args[1]
+	outf := fmt.Sprintf("%s.sig", fn)
+
+	var pws string
+	var err error
+
+	if len(envpw) > 0 {
+		pws = os.Getenv(envpw)
+	} else if pw {
+		pws, err = utils.Askpass("Enter passphrase for private key", false)
+		if err != nil {
+			die("%s", err)
+		}
+	}
+
+	if len(output) > 0 {
+		outf = output
+	}
+
+	pk, err := sign.ReadPrivateKey(kn, pws)
+	if err != nil {
+		die("%s", err)
+	}
+
+	sig, err := pk.SignFile(fn)
+	if err != nil {
+		die("%s", err)
+	}
+
+	sigo, err := sig.Serialize(fmt.Sprintf("input=%s", fn))
+
+	var fd io.Writer = os.Stdout
+
+	if outf != "-" {
+		fdx, err := os.OpenFile(outf, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644)
+		if err != nil {
+			die("can't create output file %s: %s", outf, err)
+		}
+		defer fdx.Close()
+		fd = fdx
+	}
+
+	fd.Write(sigo)
+}
+
+// Verify signature on a given file
+func verify(args []string) {
+	var help, quiet bool
+
+	fs := flag.NewFlagSet("verify", flag.ExitOnError)
+	fs.BoolVarP(&help, "help", "h", false, "Show this help and exit")
+	fs.BoolVarP(&quiet, "quiet", "q", false, "Don't show any output; exit with status code only")
+
+	fs.Parse(args)
+
+	if help {
+		fs.SetOutput(os.Stdout)
+		fmt.Printf(`%s verify|v [options] pubkey sig file
+
+Verify an Ed25519 signature in SIG of FILE using a public key PUBKEY.
+
+Options:
+`, Z)
+		fs.PrintDefaults()
+		os.Exit(0)
+	}
+
+	args = fs.Args()
+	if len(args) < 3 {
+		die("Insufficient arguments to 'verify'. Try '%s verify -h' ..", Z)
+	}
+
+	pn := args[0]
+	sn := args[1]
+	fn := args[2]
+
+	sig, err := sign.ReadSignature(sn)
+	if err != nil {
+		die("Can't read signature '%s': %s", sn, err)
+	}
+
+	pk, err := sign.ReadPublicKey(pn)
+	if err != nil {
+		die("%s", err)
+	}
+
+	if !sig.IsPKMatch(pk) {
+		die("Wrong public key '%s' for verifying '%s'", pn, sn)
+	}
+
+	ok, err := pk.VerifyFile(fn, sig)
+	if err != nil {
+		die("%s", err)
+	}
+
+	exit := 0
+	if !ok {
+		exit = 1
+	}
+
+	if !quiet {
+		if ok {
+			fmt.Printf("%s: Signature %s verified\n", fn, sn)
+		} else {
+			fmt.Printf("%s: Signature %s verification failure\n", fn, sn)
+		}
+	}
+
+	os.Exit(exit)
+}
+
+func usage(c int) {
+	x := fmt.Sprintf(`%s is a tool to generate, sign and verify files with Ed25519 signatures.
+
+Usage: %s [global-options] command [options] arg [args..]
+
+Global options:
+  -h, --help       Show help and exit
+  -v, --version    Show version info and exit.
+
+Commands:
+  generate, g      Generate a new Ed25519 keypair
+  sign, s          Sign a file with a private key
+  verify, v        Verify a signature against a file and a public key
+`, Z, Z)
+
+	os.Stdout.Write([]byte(x))
+	os.Exit(c)
+}
+
+// Return true if $bn.key or $bn.pub exist; false otherwise
+func exists(bn string) bool {
+	pk := bn + ".pub"
+	sk := bn + ".key"
+
+	if _, err := os.Stat(pk); err == nil {
+		return true
+	}
+	if _, err := os.Stat(sk); err == nil {
+		return true
+	}
+
+	return false
+}
+
+// die with error
+func die(f string, v ...interface{}) {
+	warn(f, v...)
+	os.Exit(1)
+}
+
+func warn(f string, v ...interface{}) {
+	z := fmt.Sprintf("%s: %s", os.Args[0], f)
+	s := fmt.Sprintf(z, v...)
+	if n := len(s); s[n-1] != '\n' {
+		s += "\n"
+	}
+
+	os.Stderr.WriteString(s)
+	os.Stderr.Sync()
+}
+
+// vim: ft=go:sw=8:ts=8:noexpandtab:tw=98:

src/crypt.go

@@ -1,399 +0,0 @@
-// crypt.go -- Encrypt/decrypt command handling
-//
-// (c) 2016 Sudhi Herle <sudhi@herle.net>
-//
-// Licensing Terms: GPLv2
-//
-// If you need a commercial license for this work, please contact
-// the author.
-//
-// This software does not come with any express or implied
-// warranty; it is provided "as is". No claim  is made to its
-// suitability for any purpose.
-
-package main
-
-import (
-	"fmt"
-	"io"
-	"io/ioutil"
-	"os"
-	"strings"
-
-	"git.rgst.io/homelab/sigtool/v3/sign"
-	"github.com/opencoff/go-fio"
-	"github.com/opencoff/go-utils"
-	flag "github.com/opencoff/pflag"
-)
-
-// sigtool encrypt [-i|--identity my.key] to.pub [to.pub] [ssh.pub] inputfile|- [-o output]
-
-func encrypt(args []string) {
-	fs := flag.NewFlagSet("encrypt", flag.ExitOnError)
-	fs.Usage = func() {
-		encryptUsage(fs)
-	}
-
-	var outfile string
-	var keyfile string
-	var szstr string = "128k"
-	var envpw string
-	var nopw, force bool
-	var blksize uint64
-
-	fs.StringVarP(&outfile, "outfile", "o", "", "Write the output to file `F`")
-	fs.StringVarP(&keyfile, "sign", "s", "", "Sign using private key `S`")
-	fs.BoolVarP(&nopw, "no-password", "", false, "Don't ask for passphrase to decrypt the private key")
-	fs.StringVarP(&envpw, "env-password", "E", "", "Use passphrase from environment variable `E`")
-	fs.StringVarP(&szstr, "block-size", "B", szstr, "Use `S` as the encryption block size")
-	fs.BoolVarP(&force, "overwrite", "", false, "Overwrite the output file if it exists")
-
-	err := fs.Parse(args)
-	if err != nil {
-		Die("%s", err)
-	}
-
-	if blksize, err = utils.ParseSize(szstr); err != nil {
-		Die("%s", err)
-	}
-
-	var pws, infile string
-	var sk *sign.PrivateKey
-
-	if len(keyfile) > 0 {
-		sk, err = sign.ReadPrivateKey(keyfile, func() ([]byte, error) {
-			if nopw {
-				return nil, nil
-			}
-			if len(envpw) > 0 {
-				pws = os.Getenv(envpw)
-			} else {
-				pws, err = utils.Askpass("Enter passphrase for private key", false)
-				if err != nil {
-					Die("%s", err)
-				}
-			}
-			return []byte(pws), nil
-		})
-		if err != nil {
-			Die("%s", err)
-		}
-	}
-
-	args = fs.Args()
-	if len(args) < 2 {
-		Die("Insufficient args. Try '%s --help'", os.Args[0])
-	}
-
-	var infd io.Reader = os.Stdin
-	var outfd io.WriteCloser = os.Stdout
-	var inf *os.File
-
-	if len(args) > 1 {
-		infile = args[len(args)-1]
-		if infile != "-" {
-			inf := mustOpen(infile, os.O_RDONLY)
-			defer inf.Close()
-
-			infd = inf
-		}
-	}
-
-	// Lets try to read the authorized files
-	home, err := os.UserHomeDir()
-	if err != nil {
-		Die("can't find homedir for this user")
-	}
-
-	authkeys := fmt.Sprintf("%s/.ssh/authorized_keys", home)
-	authdata, err := ioutil.ReadFile(authkeys)
-	if err != nil {
-		if !os.IsNotExist(err) {
-			Die("can't open %s: %s", authkeys, err)
-		}
-	}
-
-	pka, err := sign.ParseAuthorizedKeys(authdata)
-	keymap := make(map[string]*sign.PublicKey)
-
-	for _, pk := range pka {
-		keymap[pk.Comment] = pk
-	}
-
-	if len(outfile) > 0 && outfile != "-" {
-		var mode os.FileMode = 0600 // conservative output mode
-
-		if inf != nil {
-			var err error
-			var ist, ost os.FileInfo
-
-			if ost, err = os.Stat(outfile); err != nil {
-				Die("can't stat %s: %s", outfile, err)
-			}
-
-			if ist, err = inf.Stat(); err != nil {
-				Die("can't stat %s: %s", infile, err)
-			}
-
-			if os.SameFile(ist, ost) {
-				Die("won't create output file: same as input file!")
-			}
-			mode = ist.Mode()
-		}
-
-		var opts uint32
-		if force {
-			opts |= fio.OPT_OVERWRITE
-		}
-		sf, err := fio.NewSafeFile(outfile, opts, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, mode)
-		if err != nil {
-			Die("%s", err)
-		}
-
-		AtExit(sf.Abort)
-		defer sf.Abort()
-		outfd = sf
-	}
-
-	en, err := sign.NewEncryptor(sk, blksize)
-	if err != nil {
-		Die("%s", err)
-	}
-
-	errs := 0
-	for i := 0; i < len(args)-1; i++ {
-		var err error
-		var pk *sign.PublicKey
-
-		fn := args[i]
-		if strings.Index(fn, "@") > 0 {
-			var ok bool
-			pk, ok = keymap[fn]
-			if !ok {
-				Warn("can't find user %s in %s", fn, authkeys)
-				errs += 1
-				continue
-			}
-		} else {
-			pk, err = sign.ReadPublicKey(fn)
-			if err != nil {
-				Warn("%s", err)
-				errs += 1
-				continue
-			}
-		}
-
-		err = en.AddRecipient(pk)
-		if err != nil {
-			Die("%s", err)
-		}
-	}
-
-	if errs > 0 {
-		Die("Too many errors!")
-	}
-
-	err = en.Encrypt(infd, outfd)
-	if err != nil {
-		Die("%s", err)
-	}
-	outfd.Close()
-}
-
-type nullWriter struct{}
-
-func (w *nullWriter) Write(p []byte) (int, error) {
-	return len(p), nil
-}
-
-func (w *nullWriter) Close() error {
-	return nil
-}
-
-var _ io.WriteCloser = &nullWriter{}
-
-// sigtool decrypt a.key [file] [-o output]
-func decrypt(args []string) {
-	fs := flag.NewFlagSet("decrypt", flag.ExitOnError)
-	fs.Usage = func() {
-		decryptUsage(fs)
-	}
-
-	var envpw string
-	var outfile string
-	var pubkey string
-	var nopw, test, force bool
-
-	fs.StringVarP(&outfile, "outfile", "o", "", "Write the output to file `F`")
-	fs.BoolVarP(&nopw, "no-password", "", false, "Don't ask for passphrase to decrypt the private key")
-	fs.StringVarP(&envpw, "env-password", "E", "", "Use passphrase from environment variable `E`")
-	fs.StringVarP(&pubkey, "verify-sender", "v", "", "Verify that the sender matches public key in `F`")
-	fs.BoolVarP(&test, "test", "t", false, "Test the encrypted file against the given key without writing to output")
-	fs.BoolVarP(&force, "overwrite", "", false, "Overwrite the output file if it exists")
-
-	err := fs.Parse(args)
-	if err != nil {
-		Die("%s", err)
-	}
-
-	args = fs.Args()
-	if len(args) < 1 {
-		Die("Insufficient args. Try '%s --help'", os.Args[0])
-	}
-
-	var infd io.Reader = os.Stdin
-	var outfd io.WriteCloser = os.Stdout
-	var inf *os.File
-	var infile string
-
-	keyfile := args[0]
-	sk, err := sign.ReadPrivateKey(keyfile, func() ([]byte, error) {
-		var pws string
-		if nopw {
-			return nil, nil
-		}
-
-		if len(envpw) > 0 {
-			pws = os.Getenv(envpw)
-		} else {
-			pws, err = utils.Askpass("Enter passphrase for private key", false)
-			if err != nil {
-				Die("%s", err)
-			}
-		}
-		return []byte(pws), nil
-	})
-	if err != nil {
-		Die("%s", err)
-	}
-
-	var pk *sign.PublicKey
-
-	if len(pubkey) > 0 {
-		pk, err = sign.ReadPublicKey(pubkey)
-		if err != nil {
-			Die("%s", err)
-		}
-	}
-
-	if len(args) > 1 {
-		infile = args[1]
-		if infile != "-" {
-			inf := mustOpen(infile, os.O_RDONLY)
-			defer inf.Close()
-
-			infd = inf
-		}
-	}
-
-	if test {
-		outfd = &nullWriter{}
-	} else if len(outfile) > 0 && outfile != "-" {
-		var mode os.FileMode = 0600 // conservative mode
-
-		if inf != nil {
-			var ist, ost os.FileInfo
-			var err error
-
-			if ost, err = os.Stat(outfile); err != nil {
-				Die("can't stat %s: %s", outfile, err)
-			}
-			if ist, err = inf.Stat(); err != nil {
-				Die("can't stat %s: %s", infile, err)
-			}
-			if os.SameFile(ist, ost) {
-				Die("won't create output file: same as input file!")
-			}
-			mode = ist.Mode()
-		}
-
-		var opts uint32
-		if force {
-			opts |= fio.OPT_OVERWRITE
-		}
-		sf, err := fio.NewSafeFile(outfile, opts, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, mode)
-		if err != nil {
-			Die("%s", err)
-		}
-
-		AtExit(sf.Abort)
-		defer sf.Abort()
-		outfd = sf
-	}
-
-	d, err := sign.NewDecryptor(infd)
-	if err != nil {
-		Die("%s", err)
-	}
-
-	err = d.SetPrivateKey(sk, pk)
-	if err != nil {
-		Die("%s", err)
-	}
-
-	if pk == nil && d.AuthenticatedSender() {
-		var fn string = infile
-		if len(fn) == 0 || fn == "-" {
-			fn = "<stdin>"
-		}
-		Warn("%s: Missing sender Public Key; can't authenticate sender ..", fn)
-	}
-
-	if err = d.Decrypt(outfd); err != nil {
-		Die("%s", err)
-	}
-
-	outfd.Close()
-
-	if test {
-		Warn("Enc file OK")
-	}
-
-}
-
-func encryptUsage(fs *flag.FlagSet) {
-	fmt.Printf(`%s encrypt: Encrypt a file to one or more recipients.
-
-Usage: %s encrypt [options] to [to ...] infile|-
-
-Where TO is the public key of the recipient; it can be one of:
-
-- a file referring to an SSH or sigtool public key.
-- string of the form 'a@b' - in which case the user's default
-  ssh/authorized_keys is consulted to find the comment matching
-  'a@b' - in which case the user's ssh authorized_keys file is consulted to
-  find the comment matching the string.
-
-INFILE is an input file to be encrypted. If the input file is '-' then %s
-reads from STDIN. Unless '-o' is used, %s writes the encrypted output to STDOUT.
-
-Options:
-`, Z, Z, Z, Z)
-
-	fs.PrintDefaults()
-	os.Exit(0)
-}
-
-func decryptUsage(fs *flag.FlagSet) {
-	fmt.Printf(`%s decrypt: Decrypt a file.
-
-Usage: %s decrypt [options] key [infile]
-
-Where KEY is the private key to be used for decryption and INFILE is
-the encrypted input file. If INFILE is not provided, %s reads
-from STDIN. Unless '-o' is used, %s writes the decrypted output to STDOUT.
-
-Options:
-`, Z, Z, Z, Z)
-
-	fs.PrintDefaults()
-	os.Exit(0)
-}
-
-func mustOpen(fn string, flag int) *os.File {
-	fdk, err := os.OpenFile(fn, flag, 0600)
-	if err != nil {
-		Die("can't open file %s: %s", fn, err)
-	}
-	return fdk
-}

src/die.go

@@ -1,55 +0,0 @@
-// die.go -- die() and warn()
-//
-// (c) 2016 Sudhi Herle <sudhi@herle.net>
-//
-// Licensing Terms: GPLv2
-//
-// If you need a commercial license for this work, please contact
-// the author.
-//
-// This software does not come with any express or implied
-// warranty; it is provided "as is". No claim  is made to its
-// suitability for any purpose.
-
-package main
-
-import (
-	"fmt"
-	"os"
-)
-
-var atExit []func()
-
-// Die prints an error message to stderr
-// and exits the program after calling all the registered
-// at-exit functions.
-func Die(f string, v ...interface{}) {
-	Warn(f, v...)
-	Exit(1)
-}
-
-// Warn prints an error message to stderr
-func Warn(f string, v ...interface{}) {
-	z := fmt.Sprintf("%s: %s", os.Args[0], f)
-	s := fmt.Sprintf(z, v...)
-	if n := len(s); s[n-1] != '\n' {
-		s += "\n"
-	}
-
-	os.Stderr.WriteString(s)
-	os.Stderr.Sync()
-}
-
-// AtExit registers a function to be called before the program exits.
-func AtExit(f func()) {
-	atExit = append(atExit, f)
-}
-
-// Exit invokes the registered atexit handlers and exits with the
-// given code.
-func Exit(v int) {
-	for _, f := range atExit {
-		f()
-	}
-	os.Exit(v)
-}

src/gen.go

@@ -1,100 +0,0 @@
-// gen.go -- generate keys
-//
-// (c) 2016 Sudhi Herle <sudhi@herle.net>
-//
-// Licensing Terms: GPLv2
-//
-// If you need a commercial license for this work, please contact
-// the author.
-//
-// This software does not come with any express or implied
-// warranty; it is provided "as is". No claim  is made to its
-// suitability for any purpose.
-
-package main
-
-import (
-	"fmt"
-	"os"
-	"path"
-
-	"git.rgst.io/homelab/sigtool/v3/sign"
-	"github.com/opencoff/go-utils"
-	flag "github.com/opencoff/pflag"
-)
-
-// Run the generate command
-func gen(args []string) {
-	var nopw, help, force bool
-	var comment string
-	var envpw string
-
-	fs := flag.NewFlagSet("generate", flag.ExitOnError)
-	fs.BoolVarP(&help, "help", "h", false, "Show this help and exit")
-	fs.BoolVarP(&nopw, "no-password", "", false, "Don't ask for a password for the private key")
-	fs.StringVarP(&comment, "comment", "c", "", "Use `C` as the text comment for the keys")
-	fs.StringVarP(&envpw, "env-password", "E", "", "Use passphrase from environment variable `E`")
-	fs.BoolVarP(&force, "overwrite", "", false, "Overwrite the output file if it exists")
-
-	fs.Parse(args)
-
-	if help {
-		fs.SetOutput(os.Stdout)
-		fmt.Printf(`%s generate|gen|g [options] file-prefix
-
-Generate a new Ed25519 public+private key pair and write public key to
-FILE-PREFIX.pub and private key to FILE-PREFIX.key.
-
-Options:
-`, Z)
-		fs.PrintDefaults()
-		os.Exit(0)
-	}
-
-	args = fs.Args()
-	if len(args) < 1 {
-		Die("Insufficient arguments to 'generate'. Try '%s generate -h' ..", Z)
-	}
-
-	bn := args[0]
-
-	pkn := fmt.Sprintf("%s.pub", path.Clean(bn))
-	skn := fmt.Sprintf("%s.key", path.Clean(bn))
-
-	if !force {
-		if exists(pkn) || exists(skn) {
-			Die("Public/Private key files (%s, %s) exist. won't overwrite!", skn, pkn)
-		}
-	}
-
-	var err error
-	var pw []byte
-
-	if !nopw {
-		var pws string
-		if len(envpw) > 0 {
-			pws = os.Getenv(envpw)
-		} else {
-			pws, err = utils.Askpass("Enter passphrase for private key", true)
-			if err != nil {
-				Die("%s", err)
-			}
-		}
-
-		pw = []byte(pws)
-	}
-
-	sk, err := sign.NewPrivateKey()
-	if err != nil {
-		Die("%s", err)
-	}
-
-	if err = sk.Serialize(skn, comment, force, pw); err != nil {
-		Die("%s", err)
-	}
-
-	pk := sk.PublicKey()
-	if err = pk.Serialize(pkn, comment, force); err != nil {
-		Die("%s", err)
-	}
-}

src/sign.go

@@ -1,116 +0,0 @@
-// sign.go -- 'sign' command implementation
-//
-// (c) 2016 Sudhi Herle <sudhi@herle.net>
-//
-// Licensing Terms: GPLv2
-//
-// If you need a commercial license for this work, please contact
-// the author.
-//
-// This software does not come with any express or implied
-// warranty; it is provided "as is". No claim  is made to its
-// suitability for any purpose.
-
-package main
-
-import (
-	"fmt"
-	"io"
-	"os"
-
-	"git.rgst.io/homelab/sigtool/v3/sign"
-	"github.com/opencoff/go-fio"
-	"github.com/opencoff/go-utils"
-	flag "github.com/opencoff/pflag"
-)
-
-// Run the 'sign' command.
-func signify(args []string) {
-	var nopw, help, force bool
-	var output string
-	var envpw string
-
-	fs := flag.NewFlagSet("sign", flag.ExitOnError)
-	fs.BoolVarP(&help, "help", "h", false, "Show this help and exit")
-	fs.BoolVarP(&nopw, "no-password", "", false, "Don't ask for a password for the private key")
-	fs.StringVarP(&envpw, "env-password", "E", "", "Use passphrase from environment variable `E`")
-	fs.StringVarP(&output, "output", "o", "", "Write signature to file `F`")
-	fs.BoolVarP(&force, "overwrite", "", false, "Overwrite previous signature file if it exists")
-
-	fs.Parse(args)
-
-	if help {
-		fs.SetOutput(os.Stdout)
-		fmt.Printf(`%s sign|s [options] privkey file
-
-Sign FILE with a Ed25519 private key PRIVKEY and write signature to FILE.sig
-
-Options:
-`, Z)
-		fs.PrintDefaults()
-		os.Exit(0)
-	}
-
-	args = fs.Args()
-	if len(args) < 2 {
-		Die("Insufficient arguments to 'sign'. Try '%s sign -h' ..", Z)
-	}
-
-	kn := args[0]
-	fn := args[1]
-	outf := fmt.Sprintf("%s.sig", fn)
-
-	var err error
-
-	if len(output) > 0 {
-		outf = output
-	}
-
-	var fd io.WriteCloser = os.Stdout
-
-	if outf != "-" {
-		var opts uint32
-		if force {
-			opts |= fio.OPT_OVERWRITE
-		}
-		sf, err := fio.NewSafeFile(outf, opts, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644)
-		if err != nil {
-			Die("can't create sig file: %s", err)
-		}
-
-		// we unlink and remove temp on any error
-		AtExit(sf.Abort)
-		defer sf.Abort()
-		fd = sf
-	}
-
-	sk, err := sign.ReadPrivateKey(kn, func() ([]byte, error) {
-		if nopw {
-			return nil, nil
-		}
-
-		var pws string
-		if len(envpw) > 0 {
-			pws = os.Getenv(envpw)
-		} else {
-			pws, err = utils.Askpass("Enter passphrase for private key", false)
-			if err != nil {
-				Die("%s", err)
-			}
-		}
-
-		return []byte(pws), nil
-	})
-	if err != nil {
-		Die("%s", err)
-	}
-
-	sig, err := sk.SignFile(fn)
-	if err != nil {
-		Die("%s", err)
-	}
-
-	sigbytes, err := sig.MarshalBinary(fmt.Sprintf("input=%s", fn))
-	fd.Write(sigbytes)
-	fd.Close()
-}

src/sigtool.go

@@ -1,129 +0,0 @@
-// sigtool.go -- Tool to generate, manage Ed25519 keys and
-// signatures.
-//
-// (c) 2016 Sudhi Herle <sudhi@herle.net>
-//
-// Licensing Terms: GPLv2
-//
-// If you need a commercial license for this work, please contact
-// the author.
-//
-// This software does not come with any express or implied
-// warranty; it is provided "as is". No claim  is made to its
-// suitability for any purpose.
-
-package main
-
-import (
-	"fmt"
-	"os"
-	"path"
-	"strings"
-
-	"git.rgst.io/homelab/sigtool/v3/sign"
-	"github.com/opencoff/go-utils"
-	flag "github.com/opencoff/pflag"
-)
-
-var Z string = path.Base(os.Args[0])
-
-func main() {
-	var ver, help, debug bool
-
-	mf := flag.NewFlagSet(Z, flag.ExitOnError)
-	mf.SetInterspersed(false)
-	mf.BoolVarP(&ver, "version", "v", false, "Show version info and exit")
-	mf.BoolVarP(&help, "help", "h", false, "Show help info exit")
-	mf.BoolVarP(&debug, "debug", "", false, "Enable debug mode")
-	mf.Parse(os.Args[1:])
-
-	if ver {
-		fmt.Printf("%s - %s [%s]\n", Z, ProductVersion, RepoVersion)
-		os.Exit(0)
-	}
-
-	if help {
-		usage(0)
-	}
-
-	args := mf.Args()
-	if len(args) < 1 {
-		Die("Insufficient arguments. Try '%s -h'", Z)
-	}
-
-	cmds := map[string]func(args []string){
-		"generate": gen,
-		"sign":     signify,
-		"verify":   verify,
-		"encrypt":  encrypt,
-		"decrypt":  decrypt,
-
-		"help": func(_ []string) {
-			usage(0)
-		},
-	}
-
-	words := make([]string, 0, len(cmds))
-	for k := range cmds {
-		words = append(words, k)
-	}
-
-	ab := utils.Abbrev(words)
-	canon, ok := ab[strings.ToLower(args[0])]
-	if !ok {
-		Die("Unknown command %s", args[0])
-	}
-
-	cmd := cmds[canon]
-	if cmd == nil {
-		Die("can't map command %s", canon)
-	}
-
-	if debug {
-		sign.Debug(1)
-	}
-
-	cmd(args[1:])
-
-	// always call Exit so that at-exit handlers are called.
-	Exit(0)
-}
-
-// Verify signature on a given file
-
-func usage(c int) {
-	x := fmt.Sprintf(`%s is a tool to generate, sign and verify files with Ed25519 signatures.
-
-Usage: %s [global-options] command [options] arg [args..]
-
-Global options:
-  -h, --help       Show help and exit
-  -v, --version    Show version info and exit
-  --debug	   Enable debug (DANGEROUS)
-
-Commands:
-  generate, g      Generate a new Ed25519 keypair
-  sign, s          Sign a file with a private key
-  verify, v        Verify a signature against a file and a public key
-  encrypt, e       Encrypt an input file to one or more recipients
-  decrypt, d       Decrypt a file with a private key
-`, Z, Z)
-
-	os.Stdout.Write([]byte(x))
-	os.Exit(c)
-}
-
-// Return true if $bn.key or $bn.pub exist; false otherwise
-func exists(nm string) bool {
-	if _, err := os.Stat(nm); err == nil {
-		return true
-	}
-
-	return false
-}
-
-// This will be filled in by "build"
-var RepoVersion string = "UNDEFINED"
-var ProductVersion string = "UNDEFINED"
-
-// vim: ft=go:sw=8:ts=8:noexpandtab:tw=98:

src/verify.go

@@ -1,96 +0,0 @@
-// verify.go -- Verify signatures
-//
-// (c) 2016 Sudhi Herle <sudhi@herle.net>
-//
-// Licensing Terms: GPLv2
-//
-// If you need a commercial license for this work, please contact
-// the author.
-//
-// This software does not come with any express or implied
-// warranty; it is provided "as is". No claim  is made to its
-// suitability for any purpose.
-
-package main
-
-import (
-	"fmt"
-	"os"
-
-	"git.rgst.io/homelab/sigtool/v3/sign"
-	flag "github.com/opencoff/pflag"
-)
-
-func verify(args []string) {
-	var help, quiet bool
-
-	fs := flag.NewFlagSet("verify", flag.ExitOnError)
-	fs.BoolVarP(&help, "help", "h", false, "Show this help and exit")
-	fs.BoolVarP(&quiet, "quiet", "q", false, "Don't show any output; exit with status code only")
-
-	fs.Parse(args)
-
-	if help {
-		fs.SetOutput(os.Stdout)
-		fmt.Printf(`%s verify|v [options] pubkey sig file
-
-Verify an Ed25519 signature in SIG of FILE using a public key PUBKEY.
-The pubkey can be one of:
-  - a file: either OpenSSH ed25519 pubkey or a sigtool pubkey
-  - a string: the raw OpenSSH or sigtool pubkey
-
-%s will first parse it as a string before trying to parse it as a file.
-
-Options:
-`, Z, Z)
-		fs.PrintDefaults()
-		os.Exit(0)
-	}
-
-	args = fs.Args()
-	if len(args) < 3 {
-		Die("Insufficient arguments to 'verify'. Try '%s verify -h' ..", Z)
-	}
-
-	pn := args[0]
-	sn := args[1]
-	fn := args[2]
-
-	// We first try to read the public key as a base64/openssh string
-	pk, err := sign.MakePublicKeyFromString(pn)
-	if err != nil {
-		pk, err = sign.ReadPublicKey(pn)
-		if err != nil {
-			Die("%s", err)
-		}
-	}
-
-	sig, err := sign.ReadSignature(sn)
-	if err != nil {
-		Die("Can't read signature '%s': %s", sn, err)
-	}
-
-	if !sig.IsPKMatch(pk) {
-		Die("Wrong public key '%s' for verifying '%s'", pn, sn)
-	}
-
-	ok, err := pk.VerifyFile(fn, sig)
-	if err != nil {
-		Die("%s", err)
-	}
-
-	exit := 0
-	if !ok {
-		exit = 1
-	}
-
-	if !quiet {
-		if ok {
-			fmt.Printf("%s: Signature %s verified\n", fn, sn)
-		} else {
-			fmt.Printf("%s: Signature %s verification failure\n", fn, sn)
-		}
-	}
-
-	os.Exit(exit)
-}

tests.sh

@@ -1,124 +0,0 @@
-#! /usr/bin/env bash
-# simple round-trip tests to verify the tool
-# Usage:
-#    $0 [bin=/path/to/sigtool] [tmpdir=/path/to/workdir]
-
-Z=`basename $0`
-die() {
-    echo "$Z: $@" 1>&2
-    echo "$Z: Test output in $tmpdir .." 1>&2
-    exit 1
-}
-
-# cmd line args processing
-for a in $*; do
-    key=${a%=*}
-    val=${a#*=}
-    case $key in
-        bin)
-            bin=$val
-            ;;
-
-        tmpdir)
-            tmpdir=$val
-            ;;
-
-        *)
-            echo "Ignoring $key .."
-            ;;
-    esac
-done
-
-if [ -z "$bin" ]; then
-    arch=`./build --print-arch`
-    bin=./bin/$arch/sigtool
-
-    [ -x $bin ] || ./build || die "can't find & build sigtool"
-fi
-
-[ -z "$tmpdir" ] && tmpdir=/tmp/sigtool$$
-
-mkdir -p $tmpdir        || die "can't mkdir $tmpdir"
-
-# env name for reading the password
-passenv=FOO
-
-# this is the password for SKs
-FOO=bar
-
-
-#trap "rm -rf $tmpdir" EXIT
-
-bn=$tmpdir/foo
-sig=$tmpdir/$Z.sig
-pk=$bn.pub
-sk=$bn.key
-bn2=$tmpdir/bar
-pk2=$bn2.pub
-sk2=$bn2.key
-
-encout=$tmpdir/$Z.enc
-decout=$tmpdir/$Z.dec
-
-# exit on any failure
-set -e
-
-# Now try with ssh ed25519 keys
-keygen=`which ssh-keygen`
-[ -z "$keygen" ] && die "can't find ssh-keygen"
-
-ssk1=$tmpdir/ssk1
-spk1=$ssk1.pub
-
-ssk2=$tmpdir/ssk2
-spk2=$ssk2.pub
-
-# first generate two ssh keys
-$keygen -q -C 'ssk1@foo' -t ed25519 -f $ssk1 -N "" 
-$keygen -q -C 'ssk2@foo' -t ed25519 -f $ssk2 -N "" 
-
-# extract the pk string
-spk1_str=$(cat $spk1 | awk '{ print $2 }')
-
-$bin s --no-password $ssk1 -o $sig $0       || die "can't sign with $ssk1"
-$bin v -q $spk1 $sig $0                     || die "can't verify with $spk2"
-$bin v -q $spk1_str $sig $0                 || die "can't verify with $spk2_str"
-
-$bin e --no-password -o $encout $spk2 $0       || die "can't encrypt to $spk2 with $ssk1"
-$bin d --no-password -o $decout $ssk2 $encout  || die "can't decrypt with $ssk2"
-
-# cleanup state
-rm -f $sig $encout $decout
-
-# generate keys
-$bin g -E FOO $bn                || die "can't gen keypair $pk, $sk"
-$bin g -E FOO $bn 2>/dev/null    && die "overwrote prev keypair"
-$bin g -E FOO --overwrite $bn    || die "can't force gen keypair $pk, $sk"
-$bin g -E FOO $bn2               || die "can't force gen keypair $pk2, $sk2"
-
-# extract pk string
-pk_str=$(cat $pk | grep 'pk:' | sed -e 's/^pk: //g')
-pk2_str=$(cat $pk2 | grep 'pk:' | sed -e 's/^pk: //g')
-
-# sign and verify
-$bin s -E FOO $sk $0 -o $sig            || die "can't sign $0"
-$bin v -q $pk $sig $0                   || die "can't verify signature of $0"
-$bin v -q $pk_str $sig $0               || die "can't verify signature of $0"
-$bin v -q $pk2 $sig $0 2>/dev/null      && die "bad verification with wrong $pk2"
-$bin v -q $pk2_str $sig $0 2>/dev/null  && die "bad verification with wrong $pk2"
-
-# encrypt/decrypt
-$bin e -E FOO -o $encout $pk2 $0      || die "can't encrypt to $pk2"
-$bin d -E FOO -o $decout $sk2 $encout || die "can't decrypt with $sk2"
-cmp -s $decout $0                     || die "decrypted file mismatch with $0"
-
-# now with sender verification
-$bin e -E FOO --overwrite -o $encout -s $sk $pk2 $0      || die "can't sender-encrypt to $pk2"
-$bin d -E FOO --overwrite -o $decout -v $pk $sk2 $encout || die "can't decrypt with $sk2"
-cmp -s $decout $0                                        || die "decrypted file mismatch with $0"
-
-# Only delete if everything worked
-echo "$Z: All tests pass!"
-rm -rf $tmpdir
-
-# vim: tw=100 sw=4 ts=4 expandtab