public static int Encrypt(byte[] plaintext, int offset, int len, byte[] additionalData, byte[] nonce, byte[] key, byte[] outBuffer)
{
lock (mutex) {
if (cipher == null)
{
cipher = new ChaCha7539Engine();
}
else
{
cipher.Reset();
}
if (_encryptKey == null)
{
_encryptKey = new KeyParameter(key);
}
else
{
_encryptKey.Reset();
_encryptKey.SetKey(key);
}
if (_temp_Params == null)
{
_temp_Params = new ParametersWithIV(_encryptKey, nonce);
}
else
{
_temp_Params.Reset();
_temp_Params.Set(_encryptKey, nonce);
}
cipher.Init(true, _temp_Params);
byte[] firstBlock = BufferPool.GetBuffer(64);
KeyParameter macKey = GenerateRecordMacKey(cipher, firstBlock);
cipher.ProcessBytes(plaintext, offset, len, outBuffer, 0);
byte[] mac = BufferPool.GetBuffer(16);
int macsize = CalculateRecordMac(macKey, additionalData, outBuffer, 0, len, mac);
Array.Copy(mac, 0, outBuffer, len, macsize);
BufferPool.ReturnBuffer(mac);
BufferPool.ReturnBuffer(firstBlock);
return(len + 16);
}
}
