<PackageReference Include="BouncyCastle.Cryptography" Version="2.6.2" />

Org.BouncyCastle.Crypto.Engines.XteaEngine

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