using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace GMTest
{
public class GMHelper
{
#region SM4
/// <summary>
/// SM4
/// </summary>
public class SM4
{
#region Sm4Context
/// <summary>
/// Sm4Context
/// </summary>
public class Sm4Context
{
public Sm4Context()
{
Mode = 1;
IsPadding = true;
Key = new long[32];
}
/// <summary>
/// 1表示加密，0表示解密
/// </summary>
public int Mode;
/// <summary>
/// 密钥
/// </summary>
public long[] Key;
/// <summary>
/// 是否补足16进制字符串
/// </summary>
public bool IsPadding;
}
#endregion
#region 内部函数
/// <summary>
/// 加密 非线性τ函数B=τ(A)
/// </summary>
/// <param name="b"></param>
/// <param name="i"></param>
/// <returns></returns>
private static long GetULongByBe(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;
}
/// <summary>
/// 解密 非线性τ函数B=τ(A)
/// </summary>
/// <param name="n"></param>
/// <param name="b"></param>
/// <param name="i"></param>
private static void PutULongToBe(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);
}
/// <summary>
/// 循环移位,为32位的x循环左移n位
/// </summary>
/// <param name="x"></param>
/// <param name="n"></param>
/// <returns></returns>
private static long Rotl(long x, int n)
{
return ((x & 0xFFFFFFFF) << n) | x >> (32 - n);
}
/// <summary>
/// 将密钥逆序
/// </summary>
/// <param name="sk"></param>
/// <param name="i"></param>
private static void Swap(long[] sk, int i)
{
long t = sk[i];
sk[i] = sk[(31 - i)];
sk[(31 - i)] = t;
}
/// <summary>
/// S盒
/// </summary>
private static readonly byte[] SboxTable = new byte[] {
// 0 1 2 3 4 5 6 7 8 9 a b c d e f
0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60, 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48
};
/// <summary>
/// 系统参数FK
/// </summary>
private static readonly uint[] FK = { 0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc };
/// <summary>
/// 固定参数CK
/// </summary>
private static readonly 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
};
/// <summary>
/// Sm4的S盒取值
/// </summary>
/// <param name="inch"></param>
/// <returns></returns>
private static byte Sm4Sbox(byte inch)
{
int i = inch & 0xFF;
byte retVal = SboxTable[i];
return retVal;
}
/// <summary>
/// 线性变换 L
/// </summary>
/// <param name="ka"></param>
/// <returns></returns>
private static long Sm4Lt(long ka)
{
byte[] a = new byte[4];
byte[] b = new byte[4];
PutULongToBe(ka, a, 0);
b[0] = Sm4Sbox(a[0]);
b[1] = Sm4Sbox(a[1]);
b[2] = Sm4Sbox(a[2]);
b[3] = Sm4Sbox(a[3]);
long bb = GetULongByBe(b, 0);
long c = bb ^ Rotl(bb, 2) ^ Rotl(bb, 10) ^ Rotl(bb, 18) ^ Rotl(bb, 24);
return c;
}
/// <summary>
/// 轮函数 F
/// </summary>
/// <param name="x0"></param>
/// <param name="x1"></param>
/// <param name="x2"></param>
/// <param name="x3"></param>
/// <param name="rk"></param>
/// <returns></returns>
private static long Sm4F(long x0, long x1, long x2, long x3, long rk)
{
return x0 ^ Sm4Lt(x1 ^ x2 ^ x3 ^ rk);
}
/// <summary>
/// 轮密钥rk
/// </summary>
/// <param name="ka"></param>
/// <returns></returns>
private static long Sm4CalciRk(long ka)
{
byte[] a = new byte[4];
byte[] b = new byte[4];
PutULongToBe(ka, a, 0);
b[0] = Sm4Sbox(a[0]);
b[1] = Sm4Sbox(a[1]);
b[2] = Sm4Sbox(a[2]);
b[3] = Sm4Sbox(a[3]);
long bb = GetULongByBe(b, 0);
long rk = bb ^ Rotl(bb, 13) ^ Rotl(bb, 23);
return rk;
}
/// <summary>
/// 加密密钥
/// </summary>
/// <param name="SK"></param>
/// <param name="key"></param>
private static void SetKey(long[] SK, byte[] key)
{
//加密密钥长度为 128 比特
long[] MK = new long[4];
int i = 0;
MK[0] = GetULongByBe(key, 0);
MK[1] = GetULongByBe(key, 4);
MK[2] = GetULongByBe(key, 8);
MK[3] = GetULongByBe(key, 12);
long[] k = new long[36];
//轮密钥生成方法
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)];
}
}
/// <summary>
/// 解密函数
/// </summary>
/// <param name="sk">轮密钥</param>
/// <param name="input">输入分组的密文</param>
/// <param name="output">输出的对应的分组明文</param>
private static void Sm4OneRound(long[] sk, byte[] input, byte[] output)
{
int i = 0;
long[] ulbuf = new long[36];
ulbuf[0] = GetULongByBe(input, 0);
ulbuf[1] = GetULongByBe(input, 4);
ulbuf[2] = GetULongByBe(input, 8);
ulbuf[3] = GetULongByBe(input, 12);
while (i < 32) //开始32轮解密 ，一次进行4轮，共计八次
{
ulbuf[(i + 4)] = Sm4F(ulbuf[i], ulbuf[(i + 1)], ulbuf[(i + 2)], ulbuf[(i + 3)], sk[i]);
i++;
}
PutULongToBe(ulbuf[35], output, 0);
PutULongToBe(ulbuf[34], output, 4);
PutULongToBe(ulbuf[33], output, 8);
PutULongToBe(ulbuf[32], output, 12);
}
#endregion
#region 外部函数
/// <summary>
/// 补足 16 进制字符串的 0 字符，返回不带 0x 的16进制字符串
/// </summary>
/// <param name="input"></param>
/// <param name="mode">1表示加密，0表示解密</param>
/// <returns></returns>
public static byte[] Padding(byte[] input, int mode)
{
if (input == null)
{
return null;
}
byte[] ret;
if (mode == 1)
{
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;
}
/// <summary>
/// 设置加密的key
/// </summary>
/// <param name="ctx"></param>
/// <param name="key">16字节</param>
public static void SetKeyEnc(Sm4Context ctx, byte[] key)
{
ctx.Mode = 1;
SetKey(ctx.Key, key);
}
/// <summary>
/// 设置解密的key
/// </summary>
/// <param name="ctx"></param>
/// <param name="key">16字节</param>
public static void Sm4SetKeyDec(Sm4Context ctx, byte[] key)
{
ctx.Mode = 0;
SetKey(ctx.Key, key);
for (int i = 0; i < 16; i++)
{
Swap(ctx.Key, i);
}
}
/// <summary>
/// ECB
/// </summary>
/// <param name="ctx"></param>
/// <param name="input"></param>
/// <returns></returns>
public static byte[] Sm4CryptEcb(Sm4Context ctx, byte[] input)
{
if (ctx.IsPadding && (ctx.Mode == 1))
{
input = Padding(input, 1);
}
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);
Sm4OneRound(ctx.Key, inBytes, outBytes);
Array.Copy(outBytes, 0, bous, i * 16, length > 16 ? 16 : length);
}
if (ctx.IsPadding && ctx.Mode == 0)
{
bous = Padding(bous, 0);
}
return bous;
}
/// <summary>
/// CBC
/// </summary>
/// <param name="ctx"></param>
/// <param name="input"></param>
/// <param name="iv">16字节，为null时，默认使用0000000000000000</param>
/// <returns></returns>
public static byte[] Sm4CryptCbc(Sm4Context ctx, byte[] input, byte[] iv = null)
{
if (iv == null)
{
iv = System.Text.Encoding.Default.GetBytes("0000000000000000");
}
if (ctx.IsPadding && ctx.Mode == 1)
{
input = Padding(input, 1);
}
int length = input.Length;
byte[] bins = new byte[length];
Array.Copy(input, 0, bins, 0, length);
List<byte> bousList = new List<byte>();
int i;
if (ctx.Mode == 1)
{
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, j * 16, inBytes, 0, length > 16 ? 16 : length);
for (i = 0; i < 16; i++)
{
outBytes[i] = ((byte)(inBytes[i] ^ iv[i]));
}
Sm4OneRound(ctx.Key, 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, j * 16, inBytes, 0, length > 16 ? 16 : length);
Array.Copy(inBytes, 0, temp, 0, 16);
Sm4OneRound(ctx.Key, 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 == 0)
{
byte[] bous = Padding(bousList.ToArray(), 0);
return bous;
}
else
{
return bousList.ToArray();
}
}
#endregion
}
#endregion
}
}
测试代码
private void button1_Click(object sender, EventArgs e)
{
var msg = Encoding.Default.GetBytes("你好，123！");
var key = Encoding.Default.GetBytes("1234567812345678");
var ctx = new GMHelper.SM4.Sm4Context();
GMHelper.SM4.SetKeyEnc(ctx, key);
var data = GMHelper.SM4.Sm4CryptCbc(ctx, msg);
GMHelper.SM4.Sm4SetKeyDec(ctx, key);
var decMsg = GMHelper.SM4.Sm4CryptCbc(ctx, data);
var hexMsg = Encoding.Default.GetString(Hex.Encode(data));
var base64Msg = Convert.ToBase64String(data);
Console.WriteLine("CBC_Hex数据:" + hexMsg);
Console.WriteLine("CBC_Base64数据:" + base64Msg);
for (var i = 0; i < decMsg.Length; i++)
{
if (msg[i] != decMsg[i])
{
MessageBox.Show(this, "CBC解密失败");
return;
}
}
MessageBox.Show(this, "CBC解密成功");
GMHelper.SM4.SetKeyEnc(ctx, key);
data = GMHelper.SM4.Sm4CryptEcb(ctx, msg);
GMHelper.SM4.Sm4SetKeyDec(ctx, key);
decMsg = GMHelper.SM4.Sm4CryptEcb(ctx, data);
hexMsg = Encoding.Default.GetString(Hex.Encode(data));
base64Msg = Convert.ToBase64String(data);
Console.WriteLine("ECB_Hex数据:" + hexMsg);
Console.WriteLine("ECB_Base64数据:" + base64Msg);
for (var i = 0; i < decMsg.Length; i++)
{
if (msg[i] != decMsg[i])
{
MessageBox.Show(this, "ECB解密失败");
return;
}
}
MessageBox.Show(this, "ECB解密成功");
}
