namespace Org.BouncyCastle.Crypto.Agreement { public sealed class X25519Agreement : IRawAgreement { public int AgreementSize { get; } public void Init(ICipherParameters parameters); public void CalculateAgreement(ICipherParameters publicKey, byte[] buf, int off); public void CalculateAgreement(ICipherParameters publicKey, Span<byte> buf); public X25519Agreement(); } }