<PackageReference Include="BouncyCastle.Cryptography" Version="2.4.0" />

IRsa

public interface IRsa
using Org.BouncyCastle.Math; namespace Org.BouncyCastle.Crypto { public interface IRsa { void Init(bool forEncryption, ICipherParameters parameters); int GetInputBlockSize(); int GetOutputBlockSize(); BigInteger ConvertInput(byte[] buf, int off, int len); BigInteger ProcessBlock(BigInteger input); byte[] ConvertOutput(BigInteger result); } }