sigtool/internal/pb/hdr.proto

syntax="proto3";

//import "gogoproto/gogo.proto"

package pb;

//option (gogoproto.marshaler_all) = true;
//option (gogoproto.sizer_all) = true;
//option (gogoproto.unmarshaler_all) = true;
//option (gogoproto.goproto_getters_all) = false;

/*
 * 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_sign = 4;  // signature block of sender
	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
}