<PackageReference Include="BouncyCastle.Cryptography" Version="2.3.0" />

Org.BouncyCastle.Crypto.Engines.RC6Engine

public class RC6Engine : IBlockCipher
namespace Org.BouncyCastle.Crypto.Engines { public class RC6Engine : IBlockCipher { public virtual string AlgorithmName { get; } public RC6Engine(); public virtual int GetBlockSize(); public virtual void Init(bool forEncryption, ICipherParameters parameters); public virtual int ProcessBlock(byte[] input, int inOff, byte[] output, int outOff); } }