public SenderKeyMessage(uint keyId, uint iteration, byte[] ciphertext, IEcPrivateKey signatureKey)
{
byte[] version = { ByteUtil.IntsToByteHighAndLow((int)CurrentVersion, (int)CurrentVersion) };
byte[] message = new SenderKeyMessage
{
Id = keyId,
Iteration = iteration,
Ciphertext = ByteString.CopyFrom(ciphertext),
}.ToByteArray();
byte[] signature = GetSignature(signatureKey, ByteUtil.Combine(version, message));
_serialized = ByteUtil.Combine(version, message, signature);
_messageVersion = CurrentVersion;
_keyId = keyId;
_iteration = iteration;
_ciphertext = ciphertext;
}
public SenderKeyMessage(byte[] serialized)
{
try
{
byte[][] messageParts = ByteUtil.Split(serialized, 1, serialized.Length - 1 - SignatureLength, SignatureLength);
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) > CurrentVersion)
{
throw new InvalidMessageException("Unknown version: " + ByteUtil.HighBitsToInt(version));
}
SenderKeyMessage senderKeyMessage = Parser.ParseFrom(message);
if (senderKeyMessage.IdOneofCase == IdOneofOneofCase.None ||
senderKeyMessage.IterationOneofCase == IterationOneofOneofCase.None ||
senderKeyMessage.CiphertextOneofCase == CiphertextOneofOneofCase.None)
{
throw new InvalidMessageException("Incomplete message.");
}
_serialized = serialized;
_messageVersion = (uint)ByteUtil.HighBitsToInt(version);
_keyId = senderKeyMessage.Id;
_iteration = senderKeyMessage.Iteration;
_ciphertext = senderKeyMessage.Ciphertext.ToByteArray();
}
catch (/*InvalidProtocolBufferException | Parse*/ Exception e)
{
throw new InvalidMessageException(e);
}
}