public ChaCha20Stream(Stream underlying, byte[] key)
: base(underlying)
{
_key = key;
_chachaEncrypt = new ChaCha20(_key, _nonceLen);
Init(Send, Read);
}
int Read(Stream underlying, byte[] buf, int pos, int cnt)
{
var r = underlying.Read(_readBuffer, 0, Math.Min(cnt, _readBuffer.Length));
if (r == 0)
{
return(0);
}
var ro = 0;
if (!_icReceived)
{
var remoteNonce = new byte[_nonceLen];
Array.Copy(_readBuffer, 0, remoteNonce, 0, _nonceLen);
_icReceived = true;
r -= _nonceLen;
ro += _nonceLen;
_chachaDecrypt = new ChaCha20(_key, remoteNonce);
}
_chachaDecrypt.Crypt(_readBuffer, ro, buf, pos, r);
// Trace.WriteLine("DEC << " + Utils.Utf8.GetString(buf, pos, Math.Max(r, 40)));
return(r);
}
public ChaCha20Stream(Stream underlying, string password)
: this(underlying, ChaCha20.Kdf(password))
{
}