42bbe5ddeb
* Added new SafeFile (io.WriteCloser) class + methods to atomically write a file.
* Teach core lib to use SafeFile for all file I/O
* Teach sigtool to use SafeFile for all file I/O
* Cleaned up the public interfaces of sign/ to be more coherent:
- with uniform APIs for marshaling, unmarshaling, serialization.
- removed KeyPair class/interface and stick to PrivateKey as the primary
interface.
* collected common rand utility functions into rand.go
* Teach sigtool to NOT overwrite existing output files (keys, signatures etc.)
* Teach sigtool to use a new --overwrite option for every command that creates
files (generate, sign, encrypt, decrypt)
* encrypt/decrypt will try to use the input file mode/perm where possible
(unless input is stdin).
* Added more tests
40 lines
833 B
Go
40 lines
833 B
Go
// rand.go - utility functions to generate random quantities
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//
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// (c) 2018 Sudhi Herle <sudhi@herle.net>
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//
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// Licensing Terms: GPLv2
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//
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// If you need a commercial license for this work, please contact
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// the author.
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//
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// This software does not come with any express or implied
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// warranty; it is provided "as is". No claim is made to its
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// suitability for any purpose.
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package sign
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import (
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"crypto/rand"
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"encoding/binary"
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"fmt"
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"io"
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)
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func randu32() uint32 {
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var b [4]byte
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_, err := io.ReadFull(rand.Reader, b[:])
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if err != nil {
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panic(fmt.Sprintf("can't read 4 rand bytes: %s", err))
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}
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return binary.LittleEndian.Uint32(b[:])
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}
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func randRead(b []byte) []byte {
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_, err := io.ReadFull(rand.Reader, b)
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if err != nil {
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panic(fmt.Sprintf("can't read %d bytes of random data: %s", len(b), err))
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}
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return b
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}
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