Org.BouncyCastle.Crypto.Engines.SM4Engine public class SM4Engine : IBlockCipher SM4 Block Cipher - SM4 is a 128 bit block cipher with a 128 bit key. Documentation Code public virtual string AlgorithmName { get; } public SM4Engine() public virtual int GetBlockSize() public virtual void Init(bool forEncryption, ICipherParameters parameters) public virtual int ProcessBlock(byte[] input, int inOff, byte[] output, int outOff) public virtual int ProcessBlock(ReadOnlySpan<byte> input, Span<byte> output)