public WhisperMessage(UInt32 messageVersion, byte[] macKey, ECPublicKey senderRatchetKey,
UInt32 counter, UInt32 previousCounter, byte[] ciphertext,
IdentityKey senderIdentityKey,
IdentityKey receiverIdentityKey)
{
byte[] version = { ByteUtil.IntsToByteHighAndLow(messageVersion, CURRENT_VERSION) };
var messageObj = new WhisperProtos.WhisperMessage {
RatchetKey = senderRatchetKey.Serialize(),
Counter = counter,
PreviousCounter = previousCounter,
Ciphertext = ciphertext
};
byte[] message;
using(var stream = new MemoryStream())
{
Serializer.Serialize<WhisperProtos.WhisperMessage>(stream, messageObj);
message = stream.ToArray();
}
byte[] mac = GetMac(messageVersion, senderIdentityKey, receiverIdentityKey, macKey,
ByteUtil.Combine(version, message));
_serialized = ByteUtil.Combine(version, message, mac);
SenderRatchetKey = senderRatchetKey;
Counter = counter;
PreviousCounter = previousCounter;
Body = ciphertext;
MessageVersion = messageVersion;
}
public WhisperMessage(byte[] serialized)
{
try
{
byte[][] messageParts = ByteUtil.split(serialized, 1, serialized.Length - 1 - MAC_LENGTH, MAC_LENGTH);
byte version = messageParts[0][0];
byte[] message = messageParts[1];
byte[] mac = messageParts[2];
if (ByteUtil.highBitsToInt(version) <= CiphertextMessage.UNSUPPORTED_VERSION)
{
throw new LegacyMessageException("Legacy message: " + ByteUtil.highBitsToInt(version));
}
if (ByteUtil.highBitsToInt(version) > CURRENT_VERSION)
{
throw new InvalidMessageException("Unknown version: " + ByteUtil.highBitsToInt(version));
}
WhisperProtos.WhisperMessage whisperMessage = WhisperProtos.WhisperMessage.ParseFrom(message);
if (!whisperMessage.HasCiphertext ||
!whisperMessage.HasCounter ||
!whisperMessage.HasRatchetKey)
{
throw new InvalidMessageException("Incomplete message.");
}
this.serialized = serialized;
this.senderRatchetKey = Curve.decodePoint(whisperMessage.RatchetKey.ToByteArray(), 0);
this.messageVersion = (uint)ByteUtil.highBitsToInt(version);
this.counter = whisperMessage.Counter;
this.previousCounter = whisperMessage.PreviousCounter;
this.ciphertext = whisperMessage.Ciphertext.ToByteArray();
}
catch (/*InvalidProtocolBufferException | InvalidKeyException | Parse*/ Exception e)
{
throw new InvalidMessageException(e);
}
}
