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

Org.BouncyCastle.Crypto.Engines.Cast5Engine

public class Cast5Engine : IBlockCipher
namespace Org.BouncyCastle.Crypto.Engines { public class Cast5Engine : IBlockCipher { public virtual string AlgorithmName { get; } public Cast5Engine(); public virtual void Init(bool forEncryption, ICipherParameters parameters); public virtual int ProcessBlock(byte[] input, int inOff, byte[] output, int outOff); public virtual int GetBlockSize(); } }