"국 밀 암호 화 알고리즘" SM 시리즈 의 C \ # 실현 방법

30216 단어 c#
요약
본 고 는 주로 '국 밀 암호 화 알고리즘' SM 시리즈 의 C \ # 실현 방법 을 설명 하고 구체 적 인 알고리즘 분석 과 관련 되 지 않 으 며 인터넷 에서 찾 은 자바 실현 방법 이 비교적 적 고 크로스 언어 암호 화 복호화 에 문제 가 있 을 수 있 으 므 로 이 문 지 를 정리 하고 자 한다.JAVA 참조 실현http://blog.csdn.net/ererfei/article/details/50998162
1.SM2 & SM3
SM2 알고리즘 에서 SM3 요약 알고리즘 을 사용 해 야 하기 때문에 함께 놓 습 니 다.
프로젝트 디 렉 터 리 구 조 는 다음 과 같 습 니 다.
"국 밀 암호 화 알고리즘" SM 시리즈 의 C \ # 실현 방법 b. Sm2 도구 류
【SM2Utils.cs】
using Com.Mlq.SM;using Org.BouncyCastle.Crypto;using Org.BouncyCastle.Crypto.Parameters;using Org.BouncyCastle.Math;using Org.BouncyCastle.Math.EC;using Org.BouncyCastle.Utilities.Encoders;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;
namespace Com.Mlq.SM{class SM2Utils{public static void GenerateKeyPair(){SM2 sm2 = SM2.Instance;AsymmetricCipherKeyPair key = sm2.ecc_key_pair_generator.GenerateKeyPair(); ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters) key.Private; ECPublicKeyParameters ecpub = (ECPublicKeyParameters) key.Public; BigInteger privateKey = ecpriv.D; ECPoint publicKey = ecpub.Q;
        System.Console.Out.WriteLine("  : " + Encoding.Default.GetString(Hex.Encode(publicKey.GetEncoded())).ToUpper());
        System.Console.Out.WriteLine("  : " + Encoding.Default.GetString(Hex.Encode(privateKey.ToByteArray())).ToUpper());  
    }

    public static String Encrypt(byte[] publicKey,byte[] data)
    {
        if (null == publicKey || publicKey.Length == 0)
        {
            return null;
        }
        if (data == null || data.Length == 0)
        {
            return null;
        }

        byte[] source = new byte[data.Length];
        Array.Copy(data, 0, source, 0, data.Length);

        Cipher cipher = new Cipher();
        SM2 sm2 = SM2.Instance;

        ECPoint userKey = sm2.ecc_curve.DecodePoint(publicKey);

        ECPoint c1 = cipher.Init_enc(sm2, userKey);
        cipher.Encrypt(source);

        byte[] c3 = new byte[32];
        cipher.Dofinal(c3);

        String sc1 = Encoding.Default.GetString(Hex.Encode(c1.GetEncoded()));
        String sc2 = Encoding.Default.GetString(Hex.Encode(source));
        String sc3 = Encoding.Default.GetString(Hex.Encode(c3));

        return (sc1 + sc2 + sc3).ToUpper();
    }

    public static byte[] Decrypt(byte[] privateKey, byte[] encryptedData)
    {
        if (null == privateKey || privateKey.Length == 0)
        {
            return null;
        }
        if (encryptedData == null || encryptedData.Length == 0)
        {
            return null;
        }

        String data = Encoding.Default.GetString(Hex.Encode(encryptedData));

        byte[] c1Bytes = Hex.Decode(Encoding.Default.GetBytes(data.Substring(0 , 130)));
        int c2Len = encryptedData.Length - 97;
        byte[] c2 = Hex.Decode(Encoding.Default.GetBytes(data.Substring(130 , 2 * c2Len)));
        byte[] c3 = Hex.Decode(Encoding.Default.GetBytes(data.Substring(130 + 2 * c2Len , 64)));

        SM2 sm2 = SM2.Instance;
        BigInteger userD = new BigInteger(1, privateKey);

        ECPoint c1 = sm2.ecc_curve.DecodePoint(c1Bytes);
        Cipher cipher = new Cipher();
        cipher.Init_dec(userD, c1);
        cipher.Decrypt(c2);
        cipher.Dofinal(c3);

        return c2;
    }

    //[STAThread]
    //public static void Main()
    //{
    //    GenerateKeyPair();

    //    String plainText = "ererfeiisgod";
    //    byte[] sourceData = Encoding.Default.GetBytes(plainText);

    //    //         generateKeyPair()         
    //    //           
    //    String prik = "3690655E33D5EA3D9A4AE1A1ADD766FDEA045CDEAA43A9206FB8C430CEFE0D94";
    //    //           
    //    String pubk = "04F6E0C3345AE42B51E06BF50B98834988D54EBC7460FE135A48171BC0629EAE205EEDE253A530608178A98F1E19BB737302813BA39ED3FA3C51639D7A20C7391A";

    //    System.Console.Out.WriteLine("  : ");
    //    String cipherText = SM2Utils.Encrypt(Hex.Decode(pubk), sourceData);
    //    System.Console.Out.WriteLine(cipherText);
    //    System.Console.Out.WriteLine("  : ");
    //    plainText = Encoding.Default.GetString(SM2Utils.Decrypt(Hex.Decode(prik), Hex.Decode(cipherText)));
    //    System.Console.Out.WriteLine(plainText);

    //    Console.ReadLine();
    //}
}

}
c. SM3 도구 클래스
【SM3Digest.cs】
using System;using Org.BouncyCastle.Utilities.Encoders;using System.Text;using Org.BouncyCastle.Crypto;
namespace Com.Mlq.SM{public abstract class GeneralDigest : IDigest{private const int BYTE_LENGTH = 64;
    private byte[] xBuf;
    private int xBufOff;

    private long byteCount;

    internal GeneralDigest()
    {
        xBuf = new byte[4];
    }

    internal GeneralDigest(GeneralDigest t)
    {
        xBuf = new byte[t.xBuf.Length];
        Array.Copy(t.xBuf, 0, xBuf, 0, t.xBuf.Length);

        xBufOff = t.xBufOff;
        byteCount = t.byteCount;
    }

    public void Update(byte input)
    {
        xBuf[xBufOff++] = input;

        if (xBufOff == xBuf.Length)
        {
            ProcessWord(xBuf, 0);
            xBufOff = 0;
        }

        byteCount++;
    }

    public void BlockUpdate(
        byte[] input,
        int inOff,
        int length)
    {
        //
        // fill the current word
        //
        while ((xBufOff != 0) && (length > 0))
        {
            Update(input[inOff]);
            inOff++;
            length--;
        }

        //
        // process whole words.
        //
        while (length > xBuf.Length)
        {
            ProcessWord(input, inOff);

            inOff += xBuf.Length;
            length -= xBuf.Length;
            byteCount += xBuf.Length;
        }

        //
        // load in the remainder.
        //
        while (length > 0)
        {
            Update(input[inOff]);

            inOff++;
            length--;
        }
    }

    public void Finish()
    {
        long bitLength = (byteCount << 3);

        //
        // add the pad bytes.
        //
        Update(unchecked((byte)128));

        while (xBufOff != 0) Update(unchecked((byte)0));
        ProcessLength(bitLength);
        ProcessBlock();
    }

    public virtual void Reset()
    {
        byteCount = 0;
        xBufOff = 0;
        Array.Clear(xBuf, 0, xBuf.Length);
    }

    public int GetByteLength()
    {
        return BYTE_LENGTH;
    }

    internal abstract void ProcessWord(byte[] input, int inOff);
    internal abstract void ProcessLength(long bitLength);
    internal abstract void ProcessBlock();
    public abstract string AlgorithmName { get; }
    public abstract int GetDigestSize();
    public abstract int DoFinal(byte[] output, int outOff);
}

public class SupportClass
{
    /// 
    /// Performs an unsigned bitwise right shift with the specified number
    /// 
    /// Number to operate on
    /// Ammount of bits to shift
    /// The resulting number from the shift operation
    public static int URShift(int number, int bits)
    {
        if (number >= 0)
            return number >> bits;
        else
            return (number >> bits) + (2 << ~bits);
    }

    /// 
    /// Performs an unsigned bitwise right shift with the specified number
    /// 
    /// Number to operate on
    /// Ammount of bits to shift
    /// The resulting number from the shift operation
    public static int URShift(int number, long bits)
    {
        return URShift(number, (int)bits);
    }

    /// 
    /// Performs an unsigned bitwise right shift with the specified number
    /// 
    /// Number to operate on
    /// Ammount of bits to shift
    /// The resulting number from the shift operation
    public static long URShift(long number, int bits)
    {
        if (number >= 0)
            return number >> bits;
        else
            return (number >> bits) + (2L << ~bits);
    }

    /// 
    /// Performs an unsigned bitwise right shift with the specified number
    /// 
    /// Number to operate on
    /// Ammount of bits to shift
    /// The resulting number from the shift operation
    public static long URShift(long number, long bits)
    {
        return URShift(number, (int)bits);
    }

}

public class SM3Digest : GeneralDigest
{
    public override string AlgorithmName
    {
        get
        {
            return "SM3";
        }

    }
    public override int GetDigestSize()
    {
        return DIGEST_LENGTH;
    }

    private const int DIGEST_LENGTH = 32;

    private static readonly int[] v0 = new int[]{0x7380166f, 0x4914b2b9, 0x172442d7, unchecked((int) 0xda8a0600), unchecked((int) 0xa96f30bc), 0x163138aa, unchecked((int) 0xe38dee4d), unchecked((int) 0xb0fb0e4e)};

    private int[] v = new int[8];
    private int[] v_ = new int[8];

    private static readonly int[] X0 = new int[]{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

    private int[] X = new int[68];
    private int xOff;

    private int T_00_15 = 0x79cc4519;
    private int T_16_63 = 0x7a879d8a;

    public SM3Digest()
    {
        Reset();
    }

    public SM3Digest(SM3Digest t):base(t)
    {

        Array.Copy(t.X, 0, X, 0, t.X.Length);
        xOff = t.xOff;

        Array.Copy(t.v, 0, v, 0, t.v.Length);
    }

    public override void  Reset()
    {
        base.Reset();

        Array.Copy(v0, 0, v, 0, v0.Length);

        xOff = 0;
        Array.Copy(X0, 0, X, 0, X0.Length);
    }

    internal override void ProcessBlock()
    {
        int i;

        int[] ww = X;
        int[] ww_ = new int[64];

        for (i = 16; i < 68; i++)
        {
            ww[i] = P1(ww[i - 16] ^ ww[i - 9] ^ (ROTATE(ww[i - 3], 15))) ^ (ROTATE(ww[i - 13], 7)) ^ ww[i - 6];
        }

        for (i = 0; i < 64; i++)
        {
            ww_[i] = ww[i] ^ ww[i + 4];
        }

        int[] vv = v;
        int[] vv_ = v_;

        Array.Copy(vv, 0, vv_, 0, v0.Length);

        int SS1, SS2, TT1, TT2, aaa;
        for (i = 0; i < 16; i++)
        {
            aaa = ROTATE(vv_[0], 12);
            SS1 = aaa + vv_[4] + ROTATE(T_00_15, i);
            SS1 = ROTATE(SS1, 7);
            SS2 = SS1 ^ aaa;

            TT1 = FF_00_15(vv_[0], vv_[1], vv_[2]) + vv_[3] + SS2 + ww_[i];
            TT2 = GG_00_15(vv_[4], vv_[5], vv_[6]) + vv_[7] + SS1 + ww[i];
            vv_[3] = vv_[2];
            vv_[2] = ROTATE(vv_[1], 9);
            vv_[1] = vv_[0];
            vv_[0] = TT1;
            vv_[7] = vv_[6];
            vv_[6] = ROTATE(vv_[5], 19);
            vv_[5] = vv_[4];
            vv_[4] = P0(TT2);
        }
        for (i = 16; i < 64; i++)
        {
            aaa = ROTATE(vv_[0], 12);
            SS1 = aaa + vv_[4] + ROTATE(T_16_63, i);
            SS1 = ROTATE(SS1, 7);
            SS2 = SS1 ^ aaa;

            TT1 = FF_16_63(vv_[0], vv_[1], vv_[2]) + vv_[3] + SS2 + ww_[i];
            TT2 = GG_16_63(vv_[4], vv_[5], vv_[6]) + vv_[7] + SS1 + ww[i];
            vv_[3] = vv_[2];
            vv_[2] = ROTATE(vv_[1], 9);
            vv_[1] = vv_[0];
            vv_[0] = TT1;
            vv_[7] = vv_[6];
            vv_[6] = ROTATE(vv_[5], 19);
            vv_[5] = vv_[4];
            vv_[4] = P0(TT2);
        }
        for (i = 0; i < 8; i++)
        {
            vv[i] ^= vv_[i];
        }

        // Reset
        xOff = 0;
        Array.Copy(X0, 0, X, 0, X0.Length);
    }

    internal override void  ProcessWord(byte[] in_Renamed, int inOff)
    {
        int n = in_Renamed[inOff] << 24;
        n |= (in_Renamed[++inOff] & 0xff) << 16;
        n |= (in_Renamed[++inOff] & 0xff) << 8;
        n |= (in_Renamed[++inOff] & 0xff);
        X[xOff] = n;

        if (++xOff == 16)
        {
            ProcessBlock();
        }
    }

    internal override void ProcessLength(long bitLength)
    {
        if (xOff > 14)
        {
            ProcessBlock();
        }

        X[14] = (int) (SupportClass.URShift(bitLength, 32));
        X[15] = (int) (bitLength & unchecked((int) 0xffffffff));
    }

    public static void  IntToBigEndian(int n, byte[] bs, int off)
    {
        bs[off] = (byte) (SupportClass.URShift(n, 24));
        bs[++off] = (byte) (SupportClass.URShift(n, 16));
        bs[++off] = (byte) (SupportClass.URShift(n, 8));
        bs[++off] = (byte) (n);
    }

    public override int DoFinal(byte[] out_Renamed, int outOff)
    {
        Finish();

        for (int i = 0; i < 8; i++)
        {
            IntToBigEndian(v[i], out_Renamed, outOff + i * 4);
        }

        Reset();

        return DIGEST_LENGTH;
    }

    private int ROTATE(int x, int n)
    {
        return (x << n) | (SupportClass.URShift(x, (32 - n)));
    }

    private int P0(int X)
    {
        return ((X) ^ ROTATE((X), 9) ^ ROTATE((X), 17));
    }

    private int P1(int X)
    {
        return ((X) ^ ROTATE((X), 15) ^ ROTATE((X), 23));
    }

    private int FF_00_15(int X, int Y, int Z)
    {
        return (X ^ Y ^ Z);
    }

    private int FF_16_63(int X, int Y, int Z)
    {
        return ((X & Y) | (X & Z) | (Y & Z));
    }

    private int GG_00_15(int X, int Y, int Z)
    {
        return (X ^ Y ^ Z);
    }

    private int GG_16_63(int X, int Y, int Z)
    {
        return ((X & Y) | (~ X & Z));
    }

    //[STAThread]
    //public static void  Main()
    //{
    //    byte[] md = new byte[32];
    //    byte[] msg1 = Encoding.Default.GetBytes("ererfeiisgod");
    //    SM3Digest sm3 = new SM3Digest();
    //    sm3.BlockUpdate(msg1, 0, msg1.Length);
    //    sm3.DoFinal(md, 0);
    //    System.String s = new UTF8Encoding().GetString(Hex.Encode(md));
    //    System.Console.Out.WriteLine(s.ToUpper());

    //    Console.ReadLine();
    //}
}

}
2.SM4
직접 코드 올 리 기:
a. Sm4 주 클래스
【SM4.cs】
using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Text;using System.Threading.Tasks;
namespace Com.Mlq.SM{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(SM4_Context ctx, byte[] key)
    {
        ctx.mode = SM4_ENCRYPT;
        sm4_setkey(ctx.sk, key);
    }

    public void sm4_setkey_dec(SM4_Context 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(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);
        byte[] bous = null;
        List bousList = new List();
        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();
        }
    }
}

}
b. Sm4 실체 클래스
【SM4_Context.cs】
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;
namespace Com.Mlq.SM{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];
    }  
}

}
c. SM4 도구 클래스
【SM4Utils.cs】
using Org.BouncyCastle.Utilities.Encoders;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;
namespace Com.Mlq.SM{class SM4Utils{public String secretKey = "";public String iv = "";public bool hexString = false;
    public String Encrypt_ECB(String plainText)
    {
        SM4_Context ctx = new SM4_Context();
        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));

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

    public String Decrypt_ECB(String cipherText)
    {
        SM4_Context ctx = new SM4_Context();
        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);
    }
    public String Encrypt_CBC(String plainText)
    {
        SM4_Context ctx = new SM4_Context();
        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));

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

    public String Decrypt_CBC(String cipherText)
    {
        SM4_Context ctx = new SM4_Context();
        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);
    }

    //[STAThread]
    //public static void Main()
    //{
    //    String plainText = "ererfeiisgod";  

    //    SM4Utils sm4 = new SM4Utils();  
    //    sm4.secretKey = "JeF8U9wHFOMfs2Y8";  
    //    sm4.hexString = false;  

    //    System.Console.Out.WriteLine("ECB  ");  
    //    String cipherText = sm4.Encrypt_ECB(plainText);  
    //    System.Console.Out.WriteLine("  : " + cipherText);  
    //    System.Console.Out.WriteLine("");  

    //    plainText = sm4.Decrypt_ECB(cipherText);  
    //    System.Console.Out.WriteLine("  : " + plainText);  
    //    System.Console.Out.WriteLine("");  

    //    System.Console.Out.WriteLine("CBC  ");  
    //    sm4.iv = "UISwD9fW6cFh9SNS";  
    //    cipherText = sm4.Encrypt_CBC(plainText);  
    //    System.Console.Out.WriteLine("  : " + cipherText);  
    //    System.Console.Out.WriteLine("");  

    //    plainText = sm4.Decrypt_CBC(cipherText);  
    //    System.Console.Out.WriteLine("  : " + plainText);

    //    Console.ReadLine();
    //}
}

}
이상 은 SM2 & SM3 & SM4 C \ # 실 현 된 전문 소개 입 니 다. 프로그램 프로 그래 밍 을 배우 고 사용 하 는 데 도움 이 되 기 를 바 랍 니 다.

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