C#实现SM4国密算法(可调用,直接用)_c# sm4-程序员宅基地

技术标签: 算法  

C#实现SM4国密算法,可调用可运行,有示例

此项目基础需要第三方Nuget包:Portable.BouncyCastle;
添加方法:右击项目名称,选择“管理Nuget程序包”,在搜索栏搜索Portable.BouncyCastle,选择安装。
此项目有四个类,Sm4Crypto、SM4、SM4Context、Form1。其中Form1是调用加密算法及输入原文的界面类。
需要引入的命名空间:
using Org.BouncyCastle.Utilities.Encoders;

1.Sm4Crypto

public class Sm4Crypto
{
public string secretKey = “98145489617106616498”;
public string iv = “0000000000000000”;
public bool hexString = false;

    #region ECB模式加密
    /// <summary>
    /// ECB模式加密
    /// </summary>
    /// <param name="plainText"></param>
    /// <returns></returns>
    public byte[] Encrypt_ECB(string plainText)
    {
        SM4Context ctx = new SM4Context();
        ctx.isPadding = true;
        ctx.mode = SM4.SM4_ENCRYPT;

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

        SM4 sm4 = new SM4();
        sm4.sm4_setkey_enc(ctx, keyBytes);
        byte[] encrypted = sm4.sm4_crypt_ecb(ctx, Encoding.Default.GetBytes(plainText));

        return Hex.Encode(encrypted);
    }
    /// <summary>
    /// ECB模式加密
    /// </summary>
    /// <param name="plainBytes"></param>
    /// <returns></returns>
    public byte[] Encrypt_ECB(byte[] plainBytes)
    {
        SM4Context ctx = new SM4Context();
        ctx.isPadding = true;
        ctx.mode = SM4.SM4_ENCRYPT;

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

        SM4 sm4 = new SM4();
        sm4.sm4_setkey_enc(ctx, keyBytes);
        byte[] encrypted = sm4.sm4_crypt_ecb(ctx, plainBytes);

        return Hex.Encode(encrypted);
    }
    /// <summary>
    /// ECB模式加密
    /// </summary>
    /// <param name="plainText"></param>
    /// <returns></returns>
    public string Encrypt_ECB_Str(string plainText)
    {
        SM4Context ctx = new SM4Context();
        ctx.isPadding = true;
        ctx.mode = SM4.SM4_ENCRYPT;

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

        SM4 sm4 = new SM4();
        sm4.sm4_setkey_enc(ctx, keyBytes);
        byte[] encrypted = sm4.sm4_crypt_ecb(ctx, Encoding.Default.GetBytes(plainText));

        return Encoding.Default.GetString(Hex.Encode(encrypted));
    }
    /// <summary>
    /// ECB模式加密
    /// </summary>
    /// <param name="plainBytes"></param>
    /// <returns></returns>
    public string Encrypt_ECB_Str(byte[] plainBytes)
    {
        SM4Context ctx = new SM4Context();
        ctx.isPadding = true;
        ctx.mode = SM4.SM4_ENCRYPT;

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

        SM4 sm4 = new SM4();
        sm4.sm4_setkey_enc(ctx, keyBytes);
        byte[] encrypted = sm4.sm4_crypt_ecb(ctx, plainBytes);

        return Encoding.Default.GetString(Hex.Encode(encrypted));
    }
    #endregion

    #region ECB模式解密
    /// <summary>
    /// ECB模式解密
    /// </summary>
    /// <param name="cipherText"></param>
    /// <returns></returns>
    public byte[] Decrypt_ECB(string cipherText)
    {
        SM4Context ctx = new SM4Context();
        ctx.isPadding = true;
        ctx.mode = SM4.SM4_DECRYPT;

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

        SM4 sm4 = new SM4();
        sm4.sm4_setkey_dec(ctx, keyBytes);
        byte[] decrypted = sm4.sm4_crypt_ecb(ctx, Hex.Decode(cipherText));
        return decrypted;
    }

    /// <summary>
    /// ECB模式解密
    /// </summary>
    /// <param name="plainBytes"></param>
    /// <returns></returns>
    public byte[] Decrypt_ECB(byte[] cipherBytes)
    {
        SM4Context ctx = new SM4Context();
        ctx.isPadding = true;
        ctx.mode = SM4.SM4_DECRYPT;

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

        SM4 sm4 = new SM4();
        sm4.sm4_setkey_dec(ctx, keyBytes);
        byte[] decrypted = sm4.sm4_crypt_ecb(ctx, Hex.Decode(cipherBytes));
        return decrypted;
    }

    /// <summary>
    /// ECB模式解密
    /// </summary>
    /// <param name="cipherText"></param>
    /// <returns></returns>
    public string Decrypt_ECB_Str(string cipherText)
    {
        SM4Context ctx = new SM4Context();
        ctx.isPadding = true;
        ctx.mode = SM4.SM4_DECRYPT;

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

        SM4 sm4 = new SM4();
        sm4.sm4_setkey_dec(ctx, keyBytes);
        byte[] decrypted = sm4.sm4_crypt_ecb(ctx, Hex.Decode(cipherText));
        return Encoding.Default.GetString(decrypted);
    }

    /// <summary>
    /// ECB模式解密
    /// </summary>
    /// <param name="plainBytes"></param>
    /// <returns></returns>
    public string Decrypt_ECB_Str(byte[] cipherBytes)
    {
        SM4Context ctx = new SM4Context();
        ctx.isPadding = true;
        ctx.mode = SM4.SM4_DECRYPT;

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

        SM4 sm4 = new SM4();
        sm4.sm4_setkey_dec(ctx, keyBytes);
        byte[] decrypted = sm4.sm4_crypt_ecb(ctx, Hex.Decode(cipherBytes));
        return Encoding.Default.GetString(decrypted);
    }
    #endregion

    #region CBC模式加密
    /// <summary>
    /// CBC模式加密
    /// </summary>
    /// <param name="plainText"></param>
    /// <returns></returns>
    public byte[] Encrypt_CBC(string plainText)
    {
        SM4Context ctx = new SM4Context();
        ctx.isPadding = true;
        ctx.mode = SM4.SM4_ENCRYPT;

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

        SM4 sm4 = new SM4();
        sm4.sm4_setkey_enc(ctx, keyBytes);
        byte[] encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, Encoding.Default.GetBytes(plainText));

        return Hex.Encode(encrypted);
    }

    /// <summary>
    /// CBC模式加密
    /// </summary>
    /// <param name="plainBytes"></param>
    /// <returns></returns>
    public byte[] Encrypt_CBC(byte[] plainBytes)
    {
        SM4Context ctx = new SM4Context();
        ctx.isPadding = true;
        ctx.mode = SM4.SM4_ENCRYPT;

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

        SM4 sm4 = new SM4();
        sm4.sm4_setkey_enc(ctx, keyBytes);
        byte[] encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, plainBytes);

        return Hex.Encode(encrypted);
    }

    /// <summary>
    /// CBC模式加密
    /// </summary>
    /// <param name="plainText"></param>
    /// <returns></returns>
    public string Encrypt_CBC_Str(string plainText)
    {
        SM4Context ctx = new SM4Context();
        ctx.isPadding = true;
        ctx.mode = SM4.SM4_ENCRYPT;

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

        SM4 sm4 = new SM4();
        sm4.sm4_setkey_enc(ctx, keyBytes);
        byte[] encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, Encoding.Default.GetBytes(plainText));

        return Encoding.Default.GetString(Hex.Encode(encrypted));
    }

    /// <summary>
    /// CBC模式加密
    /// </summary>
    /// <param name="plainBytes"></param>
    /// <returns></returns>
    public string Encrypt_CBC_Str(byte[] plainBytes)
    {
        SM4Context ctx = new SM4Context();
        ctx.isPadding = true;
        ctx.mode = SM4.SM4_ENCRYPT;

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

        SM4 sm4 = new SM4();
        sm4.sm4_setkey_enc(ctx, keyBytes);
        byte[] encrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, plainBytes);

        return Encoding.Default.GetString(Hex.Encode(encrypted));
    }
    #endregion

    #region CBC模式解密
    /// <summary>
    /// CBC模式解密
    /// </summary>
    /// <param name="cipherText"></param>
    /// <returns></returns>
    public byte[] Decrypt_CBC(string cipherText)
    {
        SM4Context ctx = new SM4Context();
        ctx.isPadding = true;
        ctx.mode = SM4.SM4_DECRYPT;

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

        SM4 sm4 = new SM4();
        sm4.sm4_setkey_dec(ctx, keyBytes);
        byte[] decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, Hex.Decode(cipherText));
        return decrypted;
    }

    /// <summary>
    /// CBC模式解密
    /// </summary>
    /// <param name="cipherText"></param>
    /// <returns></returns>
    public byte[] Decrypt_CBC(byte[] cipherBytes)
    {
        SM4Context ctx = new SM4Context();
        ctx.isPadding = true;
        ctx.mode = SM4.SM4_DECRYPT;

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

        SM4 sm4 = new SM4();
        sm4.sm4_setkey_dec(ctx, keyBytes);
        byte[] decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, Hex.Decode(cipherBytes));
        return decrypted;
    }
    /// <summary>
    /// CBC模式解密
    /// </summary>
    /// <param name="cipherText"></param>
    /// <returns></returns>
    public string Decrypt_CBC_Str(string cipherText)
    {
        SM4Context ctx = new SM4Context();
        ctx.isPadding = true;
        ctx.mode = SM4.SM4_DECRYPT;

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

        SM4 sm4 = new SM4();
        sm4.sm4_setkey_dec(ctx, keyBytes);
        byte[] decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, Hex.Decode(cipherText));
        return Encoding.Default.GetString(decrypted);
    }

    /// <summary>
    /// CBC模式解密
    /// </summary>
    /// <param name="cipherText"></param>
    /// <returns></returns>
    public string Decrypt_CBC_Str(byte[] cipherBytes)
    {
        SM4Context ctx = new SM4Context();
        ctx.isPadding = true;
        ctx.mode = SM4.SM4_DECRYPT;

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

        SM4 sm4 = new SM4();
        sm4.sm4_setkey_dec(ctx, keyBytes);
        byte[] decrypted = sm4.sm4_crypt_cbc(ctx, ivBytes, Hex.Decode(cipherBytes));
        return Encoding.Default.GetString(decrypted);
    }
    #endregion
}

2.SM4

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

    private 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) | (long)(b[i + 3] & 0xff) & 0xffffffffL;
        return n;
    }

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

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

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

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

        byte[] ret = (byte[])null;
        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(SM4Context ctx, byte[] key)
    {
        ctx.mode = SM4_ENCRYPT;
        sm4_setkey(ctx.sk, key);
    }

    public void sm4_setkey_dec(SM4Context ctx, byte[] key)
    {
        int i = 0;
        ctx.mode = SM4_DECRYPT;
        sm4_setkey(ctx.sk, key);
        for (i = 0; i < 16; i++)
        {
            SWAP(ctx.sk, i);
        }
    }

    public byte[] sm4_crypt_ecb(SM4Context 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(SM4Context 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);
        byte[] bous = null;
        List<byte> 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)
        {
            bous = padding(bousList.ToArray(), SM4_DECRYPT);
            return bous;
        }
        else
        {
            return bousList.ToArray();
        }
    }
}

3.SM4Context

public class SM4Context
{
    public int mode;

    public long[] sk;

    public bool isPadding;

    public SM4Context()
    {
        this.mode = 1;
        this.isPadding = true;
        this.sk = new long[32];
    }
}

4.Form1

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void btn_Encrypt_Click(object sender, EventArgs e)
    {
        Sm4Crypto sm4Crypto = new Sm4Crypto();
        string plainText = txt_Plain.Text;
        string encrypText = sm4Crypto.Encrypt_ECB_Str(plainText);
        txt_Encryp.Text = encrypText;
    }
}

实现界面

在这里插入图片描述

版权声明:本文为博主原创文章,遵循 CC 4.0 BY-SA 版权协议,转载请附上原文出处链接和本声明。
本文链接:https://blog.csdn.net/muyiliu/article/details/124401282

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