sm4加密工具类

using Org.BouncyCastle.Utilities.Encoders;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BM.BLL.Utils
{

    /// <summary>
    /// SM4工具类
    /// </summary>
    public class SM4Util
    {
        public string secretKey = "DYoH2wH2ovikJmTAn_uTdDYSPoeiqumHeFM".Substring(0, 16); // 长度必须为16字节
        public string iv = "0000000000000000";
        public bool hexString = false;

        public string Encrypt_ECB(string plainText)
        {
            var ctx = new SM4_Context
            {
                isPadding = true,
                mode = SM4.SM4_ENCRYPT
            };

            byte[] keyBytes;
            if (hexString)
            {
                keyBytes = Hex.Decode(secretKey);
            }
            else
            {
                keyBytes = Encoding.ASCII.GetBytes(secretKey);
            }

            var sm4 = new SM4();
            sm4.Sm4_setkey_enc(ctx, keyBytes);
            byte[] encrypted = sm4.Sm4_crypt_ecb(ctx, Encoding.ASCII.GetBytes(plainText));

            string cipherText = Encoding.ASCII.GetString(Base64.Encode(encrypted));
            return cipherText;
        }

        public byte[] Encrypt_ECB(byte[] plainBytes, byte[] keyBytes)
        {
            var ctx = new SM4_Context
            {
                isPadding = false,
                mode = SM4.SM4_ENCRYPT
            };

            var sm4 = new SM4();
            sm4.Sm4_setkey_enc(ctx, keyBytes);
            byte[] encrypted = sm4.Sm4_crypt_ecb(ctx, plainBytes);
            return encrypted;

            //return Hex.Encode(encrypted);
        }

        public string Decrypt_ECB(string cipherText)
        {
            var ctx = new SM4_Context
            {
                isPadding = true,
                mode = SM4.SM4_DECRYPT
            };

            byte[] keyBytes;
            if (hexString)
            {
                keyBytes = Hex.Decode(secretKey);
            }
            else
            {
                keyBytes = Encoding.ASCII.GetBytes(secretKey);
            }

            var sm4 = new SM4();
            sm4.Sm4_setkey_dec(ctx, keyBytes);
            byte[] decrypted = sm4.Sm4_crypt_ecb(ctx, Base64.Decode(cipherText));
            return Encoding.ASCII.GetString(decrypted);
        }

        public string Encrypt_CBC(string plainText)
        {
            var ctx = new SM4_Context
            {
                isPadding = true,
                mode = SM4.SM4_ENCRYPT
            };

            byte[] keyBytes;
            byte[] ivBytes;
            if (hexString)
            {
                keyBytes = Hex.Decode(secretKey);
                ivBytes = Hex.Decode(iv);
            }
            else
            {
                keyBytes = Encoding.ASCII.GetBytes(secretKey);
                ivBytes = Encoding.ASCII.GetBytes(iv);
            }

            var sm4 = new SM4();
            sm4.Sm4_setkey_enc(ctx, keyBytes);
            byte[] encrypted = sm4.Sm4_crypt_cbc(ctx, ivBytes, Encoding.ASCII.GetBytes(plainText));

            string cipherText = Encoding.ASCII.GetString(Hex.Encode(encrypted));
            return cipherText;
        }

        public string Decrypt_CBC(string cipherText)
        {
            var ctx = new SM4_Context
            {
                isPadding = true,
                mode = SM4.SM4_DECRYPT
            };

            byte[] keyBytes;
            byte[] ivBytes;
            if (hexString)
            {
                keyBytes = Hex.Decode(secretKey);
                ivBytes = Hex.Decode(iv);
            }
            else
            {
                keyBytes = Encoding.ASCII.GetBytes(secretKey);
                ivBytes = Encoding.ASCII.GetBytes(iv);
            }

            var sm4 = new SM4();
            sm4.Sm4_setkey_dec(ctx, keyBytes);
            byte[] decrypted = sm4.Sm4_crypt_cbc(ctx, ivBytes, Hex.Decode(cipherText));
            return Encoding.ASCII.GetString(decrypted);
        }
    }

    public class SM4
    {
        public const int SM4_ENCRYPT = 1;
        public const int SM4_DECRYPT = 0;

        private static long GET_ULONG_BE(byte[] b, int i)
        {
            long n = (long)(b[i] & 0xff) << 24 | (long)((b[i + 1] & 0xff) << 16) | (long)((b[i + 2] & 0xff) << 8) | b[i + 3] & 0xff & 0xffffffffL;
            return n;
        }

        private static void PUT_ULONG_BE(long n, byte[] b, int i)
        {
            b[i] = (byte)(int)(0xFF & n >> 24);
            b[i + 1] = (byte)(int)(0xFF & n >> 16);
            b[i + 2] = (byte)(int)(0xFF & n >> 8);
            b[i + 3] = (byte)(int)(0xFF & n);
        }

        private static long SHL(long x, int n)
        {
            return (x & 0xFFFFFFFF) << n;
        }

        private static long ROTL(long x, int n)
        {
            return SHL(x, n) | x >> (32 - n);
        }

        private static void SWAP(long[] sk, int i)
        {
            long t = sk[i];
            sk[i] = sk[(31 - i)];
            sk[(31 - i)] = t;
        }

        public byte[] SboxTable = new byte[] {
        0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7,
        0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
        0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3,
        0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
        0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a,
        0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
        0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95,
        0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
        0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba,
        0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
        0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b,
        0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
        0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2,
        0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
        0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52,
        0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
        0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5,
        0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
        0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55,
        0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
        0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60,
        0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
        0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f,
        0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
        0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f,
        0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
        0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd,
        0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
        0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e,
        0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
        0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20,
        0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48
    };

        public uint[] FK = {
        0xa3b1bac6,
        0x56aa3350,
        0x677d9197,
        0xb27022dc
    };

        public uint[] CK = {
        0x00070e15,0x1c232a31,0x383f464d,0x545b6269,
        0x70777e85,0x8c939aa1,0xa8afb6bd,0xc4cbd2d9,
        0xe0e7eef5,0xfc030a11,0x181f262d,0x343b4249,
        0x50575e65,0x6c737a81,0x888f969d,0xa4abb2b9,
        0xc0c7ced5,0xdce3eaf1,0xf8ff060d,0x141b2229,
        0x30373e45,0x4c535a61,0x686f767d,0x848b9299,
        0xa0a7aeb5,0xbcc3cad1,0xd8dfe6ed,0xf4fb0209,
        0x10171e25,0x2c333a41,0x484f565d,0x646b7279
    };

        private byte Sm4Sbox(byte inch)
        {
            int i = inch & 0xFF;
            byte retVal = SboxTable[i];
            return retVal;
        }

        private long Sm4Lt(long ka)
        {
            byte[] a = new byte[4];
            byte[] b = new byte[4];
            PUT_ULONG_BE(ka, a, 0);
            b[0] = Sm4Sbox(a[0]);
            b[1] = Sm4Sbox(a[1]);
            b[2] = Sm4Sbox(a[2]);
            b[3] = Sm4Sbox(a[3]);
            long bb = GET_ULONG_BE(b, 0);
            long c = bb ^ ROTL(bb, 2) ^ ROTL(bb, 10) ^ ROTL(bb, 18) ^ ROTL(bb, 24);
            return c;
        }

        private long Sm4F(long x0, long x1, long x2, long x3, long rk)
        {
            return x0 ^ Sm4Lt(x1 ^ x2 ^ x3 ^ rk);
        }

        private long Sm4CalciRK(long ka)
        {
            byte[] a = new byte[4];
            byte[] b = new byte[4];
            PUT_ULONG_BE(ka, a, 0);
            b[0] = Sm4Sbox(a[0]);
            b[1] = Sm4Sbox(a[1]);
            b[2] = Sm4Sbox(a[2]);
            b[3] = Sm4Sbox(a[3]);
            long bb = GET_ULONG_BE(b, 0);
            long rk = bb ^ ROTL(bb, 13) ^ ROTL(bb, 23);
            return rk;
        }

        private void Sm4_setkey(long[] SK, byte[] key)
        {
            long[] MK = new long[4];
            long[] k = new long[36];
            int i = 0;
            MK[0] = GET_ULONG_BE(key, 0);
            MK[1] = GET_ULONG_BE(key, 4);
            MK[2] = GET_ULONG_BE(key, 8);
            MK[3] = GET_ULONG_BE(key, 12);
            k[0] = MK[0] ^ (long)FK[0];
            k[1] = MK[1] ^ (long)FK[1];
            k[2] = MK[2] ^ (long)FK[2];
            k[3] = MK[3] ^ (long)FK[3];
            for (; i < 32; i++)
            {
                k[(i + 4)] = (k[i] ^ Sm4CalciRK(k[(i + 1)] ^ k[(i + 2)] ^ k[(i + 3)] ^ (long)CK[i]));
                SK[i] = k[(i + 4)];
            }
        }

        private void Sm4_one_round(long[] sk, byte[] input, byte[] output)
        {
            int i = 0;
            long[] ulbuf = new long[36];
            ulbuf[0] = GET_ULONG_BE(input, 0);
            ulbuf[1] = GET_ULONG_BE(input, 4);
            ulbuf[2] = GET_ULONG_BE(input, 8);
            ulbuf[3] = GET_ULONG_BE(input, 12);
            while (i < 32)
            {
                ulbuf[(i + 4)] = Sm4F(ulbuf[i], ulbuf[(i + 1)], ulbuf[(i + 2)], ulbuf[(i + 3)], sk[i]);
                i++;
            }
            PUT_ULONG_BE(ulbuf[35], output, 0);
            PUT_ULONG_BE(ulbuf[34], output, 4);
            PUT_ULONG_BE(ulbuf[33], output, 8);
            PUT_ULONG_BE(ulbuf[32], output, 12);
        }

        private static byte[] Padding(byte[] input, int mode)
        {
            if (input == null)
            {
                return null;
            }

            byte[] ret;
            if (mode == SM4_ENCRYPT)
            {
                int p = 16 - input.Length % 16;
                ret = new byte[input.Length + p];
                Array.Copy(input, 0, ret, 0, input.Length);
                for (int i = 0; i < p; i++)
                {
                    ret[input.Length + i] = (byte)p;
                }
            }
            else
            {
                int p = input[input.Length - 1];
                ret = new byte[input.Length - p];
                Array.Copy(input, 0, ret, 0, input.Length - p);
            }
            return ret;
        }

        public void Sm4_setkey_enc(SM4_Context ctx, byte[] key)
        {
            ctx.mode = SM4_ENCRYPT;
            Sm4_setkey(ctx.sk, key);
        }

        public void Sm4_setkey_dec(SM4_Context ctx, byte[] key)
        {
            ctx.mode = SM4_DECRYPT;
            Sm4_setkey(ctx.sk, key);
            int i;
            for (i = 0; i < 16; i++)
            {
                SWAP(ctx.sk, i);
            }
        }

        public byte[] Sm4_crypt_ecb(SM4_Context ctx, byte[] input)
        {
            if ((ctx.isPadding) && (ctx.mode == SM4_ENCRYPT))
            {
                input = Padding(input, SM4_ENCRYPT);
            }

            int length = input.Length;
            byte[] bins = new byte[length];
            Array.Copy(input, 0, bins, 0, length);
            byte[] bous = new byte[length];
            for (int i = 0; length > 0; length -= 16, i++)
            {
                byte[] inBytes = new byte[16];
                byte[] outBytes = new byte[16];
                Array.Copy(bins, i * 16, inBytes, 0, length > 16 ? 16 : length);
                Sm4_one_round(ctx.sk, inBytes, outBytes);
                Array.Copy(outBytes, 0, bous, i * 16, length > 16 ? 16 : length);
            }

            if (ctx.isPadding && ctx.mode == SM4_DECRYPT)
            {
                bous = Padding(bous, SM4_DECRYPT);
            }
            return bous;
        }

        public byte[] Sm4_crypt_cbc(SM4_Context ctx, byte[] iv, byte[] input)
        {
            if (ctx.isPadding && ctx.mode == SM4_ENCRYPT)
            {
                input = Padding(input, SM4_ENCRYPT);
            }

            int i = 0;
            int length = input.Length;
            byte[] bins = new byte[length];
            Array.Copy(input, 0, bins, 0, length);
            var bousList = new List<byte>();
            if (ctx.mode == SM4_ENCRYPT)
            {
                for (int j = 0; length > 0; length -= 16, j++)
                {
                    byte[] inBytes = new byte[16];
                    byte[] outBytes = new byte[16];
                    byte[] out1 = new byte[16];

                    Array.Copy(bins, i * 16, inBytes, 0, length > 16 ? 16 : length);
                    for (i = 0; i < 16; i++)
                    {
                        outBytes[i] = ((byte)(inBytes[i] ^ iv[i]));
                    }
                    Sm4_one_round(ctx.sk, outBytes, out1);
                    Array.Copy(out1, 0, iv, 0, 16);
                    for (int k = 0; k < 16; k++)
                    {
                        bousList.Add(out1[k]);
                    }
                }
            }
            else
            {
                byte[] temp = new byte[16];
                for (int j = 0; length > 0; length -= 16, j++)
                {
                    byte[] inBytes = new byte[16];
                    byte[] outBytes = new byte[16];
                    byte[] out1 = new byte[16];

                    Array.Copy(bins, i * 16, inBytes, 0, length > 16 ? 16 : length);
                    Array.Copy(inBytes, 0, temp, 0, 16);
                    Sm4_one_round(ctx.sk, inBytes, outBytes);
                    for (i = 0; i < 16; i++)
                    {
                        out1[i] = ((byte)(outBytes[i] ^ iv[i]));
                    }
                    Array.Copy(temp, 0, iv, 0, 16);
                    for (int k = 0; k < 16; k++)
                    {
                        bousList.Add(out1[k]);
                    }
                }
            }

            if (ctx.isPadding && ctx.mode == SM4_DECRYPT)
            {
                byte[] bous = Padding(bousList.ToArray(), SM4_DECRYPT);
                return bous;
            }
            else
            {
                return bousList.ToArray();
            }
        }
    }

    public class SM4_Context
    {
        public int mode;

        public long[] sk;

        public bool isPadding;

        public SM4_Context()
        {
            this.mode = 1;
            this.isPadding = true;
            this.sk = new long[32];
        }
    }

}