public SenderKeyMessage(uint keyId, uint iteration, byte[] ciphertext, ECPrivateKey signatureKey)
{
byte[] version = { ByteUtil.intsToByteHighAndLow((int)CURRENT_VERSION, (int)CURRENT_VERSION) };
byte[] message = new SenderKeyMessage
{
Id = keyId,
Iteration = iteration,
Ciphertext = ByteString.CopyFrom(ciphertext),
}.ToByteArray();
byte[] signature = getSignature(signatureKey, ByteUtil.combine(version, message));
this.serialized = ByteUtil.combine(version, message, signature);
this.messageVersion = CURRENT_VERSION;
this.keyId = keyId;
this.iteration = iteration;
this.ciphertext = ciphertext;
}
public SenderKeyMessage(byte[] serialized)
{
try
{
byte[][] messageParts = ByteUtil.split(serialized, 1, serialized.Length - 1 - SIGNATURE_LENGTH, SIGNATURE_LENGTH);
byte version = messageParts[0][0];
byte[] message = messageParts[1];
byte[] signature = messageParts[2];
if (ByteUtil.highBitsToInt(version) < 3)
{
throw new LegacyMessageException("Legacy message: " + ByteUtil.highBitsToInt(version));
}
if (ByteUtil.highBitsToInt(version) > CURRENT_VERSION)
{
throw new InvalidMessageException("Unknown version: " + ByteUtil.highBitsToInt(version));
}
SenderKeyMessage senderKeyMessage = SenderKeyMessage.Parser.ParseFrom(message);
if (senderKeyMessage.IdOneofCase == IdOneofOneofCase.None ||
senderKeyMessage.IterationOneofCase == IterationOneofOneofCase.None ||
senderKeyMessage.CiphertextOneofCase == CiphertextOneofOneofCase.None)
{
throw new InvalidMessageException("Incomplete message.");
}
this.serialized = serialized;
this.messageVersion = (uint)ByteUtil.highBitsToInt(version);
this.keyId = senderKeyMessage.Id;
this.iteration = senderKeyMessage.Iteration;
this.ciphertext = senderKeyMessage.Ciphertext.ToByteArray();
}
catch (/*InvalidProtocolBufferException | Parse*/ Exception e)
{
throw new InvalidMessageException(e);
}
}
