摘要】

本文主要讲解“国密加密算法”SM系列的C#实现方法，不涉及具体的算法剖析，在网络上找到的java实现方法比较少，切在跨语言加密解密上会存在一些问题，所以整理此文志之。JAVA实现参考http://blog.csdn.net/ererfei/article/details/50998162

1.SM2 & SM3

由于SM2算法中需要使用SM3摘要算法，所以把他们放在一起

项目目录结构如下：

“国密加密算法”SM系列的C#实现方法

b.SM2工具类

【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("公钥: " + Encoding.Default.GetString(Hex.Encode(publicKey.GetEncoded())).ToUpper());

System.Console.Out.WriteLine("私钥: " + 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);

// //下面的秘钥可以使用generateKeyPair()生成的秘钥内容

// // 国密规范正式私钥

// String prik = "3690655E33D5EA3D9A4AE1A1ADD766FDEA045CDEAA43A9206FB8C430CEFE0D94";

// // 国密规范正式公钥

// String pubk = "04F6E0C3345AE42B51E06BF50B98834988D54EBC7460FE135A48171BC0629EAE205EEDE253A530608178A98F1E19BB737302813BA39ED3FA3C51639D7A20C7391A";

// System.Console.Out.WriteLine("加密: ");

// String cipherText = SM2Utils.Encrypt(Hex.Decode(pubk), sourceData);

// System.Console.Out.WriteLine(cipherText);

// System.Console.Out.WriteLine("解密: ");

// plainText = Encoding.Default.GetString(SM2Utils.Decrypt(Hex.Decode(prik), Hex.Decode(cipherText)));

// System.Console.Out.WriteLine(plainText);

// Console.ReadLine();

//}

}

}

c.SM3工具类

【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

直接上代码：

a.SM4主类

【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实体类

【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工具类

【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模式");

// String cipherText = sm4.Encrypt_ECB(plainText);

// System.Console.Out.WriteLine("密文: " + cipherText);

// System.Console.Out.WriteLine("");

// plainText = sm4.Decrypt_ECB(cipherText);

// System.Console.Out.WriteLine("明文: " + plainText);

// System.Console.Out.WriteLine("");

// System.Console.Out.WriteLine("CBC模式");

// sm4.iv = "UISwD9fW6cFh9SNS";

// cipherText = sm4.Encrypt_CBC(plainText);

// System.Console.Out.WriteLine("密文: " + cipherText);

// System.Console.Out.WriteLine("");

// plainText = sm4.Decrypt_CBC(cipherText);

// System.Console.Out.WriteLine("明文: " + plainText);

// Console.ReadLine();

//}

}

}

以上就是SM2&SM3&SM4 C#实现的全文介绍,希望对您学习和使用程序编程有所帮助.