public void Encrypt(ReadOnlySpan <byte> nonce, ReadOnlySpan <byte> source,
Span <byte> destination, Span <byte> tag, ReadOnlySpan <byte> associatedData = default)
{
var input = ArrayPool <byte> .Shared.Rent(source.Length);
var output = ArrayPool <byte> .Shared.Rent(destination.Length + tag.Length);
try
{
_engine = new BufferedAeadCipher(new ChaCha20Poly1305());
_engine.Init(true, new AeadParameters(_key, 128, nonce.ToArray(), associatedData.ToArray()));
source.CopyTo(input);
_engine.DoFinal(input, 0, source.Length, output, 0);
output.AsSpan(0, destination.Length).CopyTo(destination);
output.AsSpan(destination.Length, tag.Length).CopyTo(tag);
}
finally
{
ArrayPool <byte> .Shared.Return(input);
ArrayPool <byte> .Shared.Return(output);
}
}
public BcChaCha20Poly1305Crypto(byte[] key)
{
_key = new KeyParameter(key);
_engine = new BufferedAeadCipher(new ChaCha20Poly1305());
}