private byte[] GetCiphertext(uint version, MessageKeys messageKeys, byte[] plaintext)
{
try
{
if (version >= 3)
{
//cipher = getCipher(Cipher.ENCRYPT_MODE, messageKeys.getCipherKey(), messageKeys.getIv());
return(Util.Encrypt.AesCbcPkcs5(plaintext, messageKeys.GetCipherKey(), messageKeys.GetIv()));
}
else
{
//cipher = getCipher(Cipher.ENCRYPT_MODE, messageKeys.getCipherKey(), messageKeys.getCounter());
return(Util.Encrypt.AesCtr(plaintext, messageKeys.GetCipherKey(), messageKeys.GetCounter()));
}
}
catch (/*IllegalBlockSizeException | BadPadding*/ Exception e)
{
throw new Exception(e.Message);
}
}
private byte[] GetPlaintext(uint version, MessageKeys messageKeys, byte[] cipherText)
{
try
{
//Cipher cipher;
if (version >= 3)
{
//cipher = getCipher(Cipher.DECRYPT_MODE, messageKeys.getCipherKey(), messageKeys.getIv());
return(Util.Decrypt.AesCbcPkcs5(cipherText, messageKeys.GetCipherKey(), messageKeys.GetIv()));
}
else
{
//cipher = getCipher(Cipher.DECRYPT_MODE, messageKeys.getCipherKey(), messageKeys.getCounter())
return(Util.Decrypt.AesCtr(cipherText, messageKeys.GetCipherKey(), messageKeys.GetCounter()));
}
}
catch (/*IllegalBlockSizeException | BadPadding*/ Exception e)
{
throw new InvalidMessageException(e);
}
}
public void SetMessageKeys(IEcPublicKey senderEphemeral, MessageKeys messageKeys)
{
Pair <SessionStructure.Types.Chain, uint> chainAndIndex = GetReceiverChain(senderEphemeral);
SessionStructure.Types.Chain chain = chainAndIndex.First();
SessionStructure.Types.Chain.Types.MessageKey messageKeyStructure = new SessionStructure.Types.Chain.Types.MessageKey
{
CipherKey = ByteString.CopyFrom(messageKeys.GetCipherKey()),
MacKey = ByteString.CopyFrom(messageKeys.GetMacKey()),
Index = messageKeys.GetCounter(),
Iv = ByteString.CopyFrom(messageKeys.GetIv())
};
chain.MessageKeys.Add(messageKeyStructure);
if (chain.MessageKeys.Count > MaxMessageKeys)
{
chain.MessageKeys.RemoveAt(0);
}
_sessionStructure.ReceiverChains[(int)chainAndIndex.Second()] = chain;
}
public void SetMessageKeys(ECPublicKey senderEphemeral, MessageKeys messageKeys)
{
Pair <Chain, uint> chainAndIndex = GetReceiverChain(senderEphemeral);
Chain chain = chainAndIndex.First();
Chain.Types.MessageKey messageKeyStructure = Chain.Types.MessageKey.CreateBuilder()
.SetCipherKey(ByteString.CopyFrom(messageKeys.GetCipherKey() /*.getEncoded()*/))
.SetMacKey(ByteString.CopyFrom(messageKeys.GetMacKey() /*.getEncoded()*/))
.SetIndex(messageKeys.GetCounter())
.SetIv(ByteString.CopyFrom(messageKeys.GetIv() /*.getIV()*/))
.Build();
Chain.Builder updatedChain = chain.ToBuilder().AddMessageKeys(messageKeyStructure);
if (updatedChain.MessageKeysList.Count > MAX_MESSAGE_KEYS)
{
updatedChain.MessageKeysList.RemoveAt(0);
}
this.sessionStructure = this.sessionStructure.ToBuilder()
.SetReceiverChains((int)chainAndIndex.Second(), updatedChain.Build()) // TODO: conv
.Build();
}
private byte[] GetPlaintext(MessageKeys messageKeys, byte[] cipherText)
{
return(Util.Decrypt.AesCbcPkcs5(cipherText, messageKeys.GetCipherKey(), messageKeys.GetIv()));
}
private byte[] GetCiphertext(MessageKeys messageKeys, byte[] plaintext)
{
return(Util.Encrypt.AesCbcPkcs5(plaintext, messageKeys.GetCipherKey(), messageKeys.GetIv()));
}