C#实现SM2国密加密

焦稚清 發表於 2020-5-7 14:21:00

<img src="https://img2020.cnblogs.com/blog/82863/202005/82863-20200507142133300-509867814.png" alt="">
 
 
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：
 
首先要下载一个dll包——BouncyCastle.Crypto.dll，并将此dll引用到项目中。实现代码如下（每个工具类都有Main可以运行测试）：
a.      SM2主类
【SM2.cs】
<div class="cnblogs_code">
<pre>using System;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Math.EC;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Security;
using System.Text;

namespace Com.Mlq.SM
{

public class SM2
{
 public static SM2 Instance
 {
 get
 {
 return new SM2();
 }

 }
 public static SM2 InstanceTest
 {
 get
 {
 return new SM2();
 }

 }

 public static readonly string[] sm2_param = {
 "FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF",// p,0
 "FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC",// a,1
 "28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93",// b,2
 "FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123",// n,3
 "32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7",// gx,4
 "BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0" // gy,5
 };

 public string[] ecc_param = sm2_param;

 public readonly BigInteger ecc_p;
 public readonly BigInteger ecc_a;
 public readonly BigInteger ecc_b;
 public readonly BigInteger ecc_n;
 public readonly BigInteger ecc_gx;
 public readonly BigInteger ecc_gy;

 public readonly ECCurve ecc_curve;
 public readonly ECPoint ecc_point_g;

 public readonly ECDomainParameters ecc_bc_spec;

 public readonly ECKeyPairGenerator ecc_key_pair_generator;

 private SM2()
 {
 ecc_param = sm2_param;

 ECFieldElement ecc_gx_fieldelement;
 ECFieldElement ecc_gy_fieldelement;

 ecc_p = new BigInteger(ecc_param[0], 16);
 ecc_a = new BigInteger(ecc_param[1], 16);
 ecc_b = new BigInteger(ecc_param[2], 16);
 ecc_n = new BigInteger(ecc_param[3], 16);
 ecc_gx = new BigInteger(ecc_param[4], 16);
 ecc_gy = new BigInteger(ecc_param[5], 16);

 ecc_gx_fieldelement = new FpFieldElement(ecc_p, ecc_gx);
 ecc_gy_fieldelement = new FpFieldElement(ecc_p, ecc_gy);

 ecc_curve = new FpCurve(ecc_p, ecc_a, ecc_b);
 ecc_point_g = new FpPoint(ecc_curve, ecc_gx_fieldelement, ecc_gy_fieldelement);

 ecc_bc_spec = new ECDomainParameters(ecc_curve, ecc_point_g, ecc_n);

 ECKeyGenerationParameters ecc_ecgenparam;
 ecc_ecgenparam = new ECKeyGenerationParameters(ecc_bc_spec, new SecureRandom());

 ecc_key_pair_generator = new ECKeyPairGenerator();
 ecc_key_pair_generator.Init(ecc_ecgenparam);
 }

 public virtual byte[] Sm2GetZ(byte[] userId, ECPoint userKey)
 {
 SM3Digest sm3 = new SM3Digest();
 byte[] p;
 // userId length
 int len = userId.Length * 8;
 sm3.Update((byte) (len >> 8 & 0x00ff));
 sm3.Update((byte) (len & 0x00ff));

 // userId
 sm3.BlockUpdate(userId, 0, userId.Length);

 // a,b
 p = ecc_a.ToByteArray();
 sm3.BlockUpdate(p, 0, p.Length);
 p = ecc_b.ToByteArray();
 sm3.BlockUpdate(p, 0, p.Length);
 // gx,gy
 p = ecc_gx.ToByteArray();
 sm3.BlockUpdate(p, 0, p.Length);
 p = ecc_gy.ToByteArray();
 sm3.BlockUpdate(p, 0, p.Length);

 // x,y
 p = userKey.X.ToBigInteger().ToByteArray();
 sm3.BlockUpdate(p, 0, p.Length);
 p = userKey.Y.ToBigInteger().ToByteArray();
 sm3.BlockUpdate(p, 0, p.Length);

 // Z
 byte[] md = new byte;
 sm3.DoFinal(md, 0);

 return md;
 }

}
}</pre>
</div>
b.      SM2工具类
【SM2Utils.cs】
<div class="cnblogs_code">
<pre>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;
 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;
 }

 //
 //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();
 //}
 }
}</pre>
</div>
c.      SM3工具类
【SM3Digest.cs】
<div class="cnblogs_code">
<pre>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;
 Array.Copy(t.xBuf, 0, xBuf, 0, t.xBuf.Length);

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

 public void Update(byte input)
 {
 xBuf = 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++;
 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++;
 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
{
 /// <summary>
 /// Performs an unsigned bitwise right shift with the specified number
 /// </summary>
 /// <param name="number">Number to operate on</param>
 /// <param name="bits">Ammount of bits to shift</param>
 /// <returns>The resulting number from the shift operation</returns>
 public static int URShift(int number, int bits)
 {
 if (number >= 0)
 return number >> bits;
 else
 return (number >> bits) + (2 << ~bits);
 }

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

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

 /// <summary>
 /// Performs an unsigned bitwise right shift with the specified number
 /// </summary>
 /// <param name="number">Number to operate on</param>
 /// <param name="bits">Ammount of bits to shift</param>
 /// <returns>The resulting number from the shift operation</returns>
 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 voidReset()
 {
 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 = P1(ww ^ ww ^ (ROTATE(ww, 15))) ^ (ROTATE(ww, 7)) ^ ww;
 }

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

 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_;
 TT2 = GG_00_15(vv_[4], vv_[5], vv_[6]) + vv_[7] + SS1 + ww;
 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_;
 TT2 = GG_16_63(vv_[4], vv_[5], vv_[6]) + vv_[7] + SS1 + ww;
 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 ^= vv_;
 }

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

 internal override voidProcessWord(byte[] in_Renamed, int inOff)
 {
 int n = in_Renamed << 24;
 n |= (in_Renamed[++inOff] & 0xff) << 16;
 n |= (in_Renamed[++inOff] & 0xff) << 8;
 n |= (in_Renamed[++inOff] & 0xff);
 X = 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 voidIntToBigEndian(int n, byte[] bs, int off)
 {
 bs = (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, 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));
 }

 //
 //public static voidMain()
 //{
 // byte[] md = new byte;
 // 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();
 //}
 }
}</pre>
</div>
<h1>2.SM4</h1>
直接上代码：
a.      SM4主类
【SM4.cs】
<div class="cnblogs_code">
<pre>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 & 0xff) << 24 | (long)((b & 0xff) << 16) | (long)((b & 0xff) << 8) | (long)(b & 0xff) & 0xffffffffL;
 return n;
 }

 private void PUT_ULONG_BE(long n, byte[] b, int i)
 {
 b = (byte)(int)(0xFF & n >> 24);
 b = (byte)(int)(0xFF & n >> 16);
 b = (byte)(int)(0xFF & n >> 8);
 b = (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;
 sk = 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;
 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 ^ sm4CalciRK(k[(i + 1)] ^ k[(i + 2)] ^ k[(i + 3)] ^ (long) CK));
 SK = 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, ulbuf[(i + 1)], ulbuf[(i + 2)], ulbuf[(i + 3)], sk);
 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;
 Array.Copy(input, 0, ret, 0, input.Length);
 for (int i = 0; i < p; i++)
 {
 ret = (byte) p;
 }
 }
 else
 {
 int p = input;
 ret = new byte;
 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;
 Array.Copy(input,0,bins,0,length);
 byte[] bous = new byte;
 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;
 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 = ((byte) (inBytes ^ iv));
 }
 sm4_one_round(ctx.sk, outBytes, out1);
 Array.Copy(out1, 0, iv, 0, 16);
 for(int k = 0;k < 16;k ++){
 bousList.Add(out1);
 }
 }
 }
 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 = ((byte) (outBytes ^ iv));
 }
 Array.Copy(temp, 0, iv, 0, 16);
 for (int k = 0; k < 16; k++)
 {
 bousList.Add(out1);
 }
 }

 }

 if (ctx.isPadding && ctx.mode == SM4_DECRYPT)
 {
 bous = padding(bousList.ToArray(), SM4_DECRYPT);
 return bous;
 }
 else
 {
 return bousList.ToArray();
 }
 }
}
}</pre>
</div>
b.      SM4实体类
【SM4_Context.cs】
<div class="cnblogs_code">
<pre>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];
 }
}
}</pre>
</div>
c.      SM4工具类
【SM4Utils.cs】
<div class="cnblogs_code">
<pre>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);
 }

 //
 //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();
 //}
 }
}</pre>
</div>
【Cipher.cs】
<div class="cnblogs_code">
<pre>using Com.Mlq.SM;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Math.EC;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Com.Mlq.SM
{
public class Cipher
{
 private int ct = 1;

 private ECPoint p2;
 private SM3Digest sm3keybase;
 private SM3Digest sm3c3;

 private byte[] key = new byte[32];
 private byte keyOff = 0;

 public Cipher()
 {
 }

 private void Reset()
 {
 sm3keybase = new SM3Digest();
 sm3c3 = new SM3Digest();

 byte[] p;

 p = p2.X.ToBigInteger().ToByteArray();
 sm3keybase.BlockUpdate(p, 0, p.Length);
 sm3c3.BlockUpdate(p, 0, p.Length);

 p = p2.Y.ToBigInteger().ToByteArray();
 sm3keybase.BlockUpdate(p, 0, p.Length);

 ct = 1;
 NextKey();
 }

 private void NextKey()
 {
 SM3Digest sm3keycur = new SM3Digest(sm3keybase);
 sm3keycur.Update((byte)(ct >> 24 & 0x00ff));
 sm3keycur.Update((byte)(ct >> 16 & 0x00ff));
 sm3keycur.Update((byte)(ct >> 8 & 0x00ff));
 sm3keycur.Update((byte)(ct & 0x00ff));
 sm3keycur.DoFinal(key, 0);
 keyOff = 0;
 ct++;
 }

 public virtual ECPoint Init_enc(SM2 sm2, ECPoint userKey)
 {
 BigInteger k = null;
 ECPoint c1 = null;

 AsymmetricCipherKeyPair key = sm2.ecc_key_pair_generator.GenerateKeyPair();
 ECPrivateKeyParameters ecpriv = (ECPrivateKeyParameters)key.Private;
 ECPublicKeyParameters ecpub = (ECPublicKeyParameters)key.Public;
 k = ecpriv.D;
 c1 = ecpub.Q;

 p2 = userKey.Multiply(k);
 Reset();

 return c1;
 }

 public virtual void Encrypt(byte[] data)
 {
 sm3c3.BlockUpdate(data, 0, data.Length);
 for (int i = 0; i < data.Length; i++)
 {
 if (keyOff == key.Length)
 NextKey();

 data ^= key;
 }
 }

 public virtual void Init_dec(BigInteger userD, ECPoint c1)
 {
 p2 = c1.Multiply(userD);
 Reset();
 }

 public virtual void Decrypt(byte[] data)
 {
 for (int i = 0; i < data.Length; i++)
 {
 if (keyOff == key.Length)
 NextKey();

 data ^= key;
 }
 sm3c3.BlockUpdate(data, 0, data.Length);
 }

 public virtual void Dofinal(byte[] c3)
 {
 byte[] p = p2.Y.ToBigInteger().ToByteArray();
 sm3c3.BlockUpdate(p, 0, p.Length);
 sm3c3.DoFinal(c3, 0);
 Reset();
 }
}
}</pre>
</div>
 引用地址：https://blog.csdn.net/ererfei/article/details/50999820 
来源：https://www.cnblogs.com/valu/p/12842778.html

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C#实现SM2国密加密