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@ -0,0 +1,323 @@
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namespace NPin.Framework.Core.Crypt.SM4;
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internal sealed class Sm4
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{
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/// <summary>
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/// 固定参数CK
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/// </summary>
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private readonly uint[] CK =
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[
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0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
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0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
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0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
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0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
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0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
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0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
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0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
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0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279
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];
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/// <summary>
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/// 系统参数FK
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/// </summary>
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private readonly uint[] FK = [0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc];
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/// <summary>
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/// S盒
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/// </summary>
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private readonly byte[] SBoxTable =
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[
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/* 0 1 2 3 4 5 6 7 8 9 a b c d e f*/
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/*0*/ 0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
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/*1*/ 0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
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/*2*/ 0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
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/*3*/ 0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
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/*4*/ 0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
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/*5*/ 0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
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/*6*/ 0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
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/*7*/ 0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
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/*8*/ 0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5, 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
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/*9*/ 0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
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/*a*/ 0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60, 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
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/*b*/ 0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f, 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
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/*c*/ 0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
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/*d*/ 0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
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/*e*/ 0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
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/*f*/ 0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48
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];
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/// <summary>
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/// 加密 非线性τ函数B=τ(A)
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/// </summary>
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/// <param name="b"></param>
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/// <param name="i"></param>
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/// <returns></returns>
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private static long GetULongByBe(byte[] b, int i) => ((long)(b[i] & 0xff) << 24) | (uint)((b[i + 1] & 0xff) << 16) | (uint)((b[i + 2] & 0xff) << 8) | (b[i + 3] & 0xff & 0xffffffffL);
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/// <summary>
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/// 解密 非线性τ函数B=τ(A)
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/// </summary>
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/// <param name="n"></param>
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/// <param name="b"></param>
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/// <param name="i"></param>
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private static void PutULongToBe(long n, byte[] b, int i)
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{
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b[i] = (byte)(int)(0xFF & (n >> 24));
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b[i + 1] = (byte)(int)(0xFF & (n >> 16));
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b[i + 2] = (byte)(int)(0xFF & (n >> 8));
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b[i + 3] = (byte)(int)(0xFF & n);
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}
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private static long SHL(long x, int n) => (x & 0xFFFFFFFF) << n;
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/// <summary>
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/// 循环移位,为32位的x循环左移n位
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/// </summary>
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/// <param name="x"></param>
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/// <param name="n"></param>
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/// <returns></returns>
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private static long RotL(long x, int n) => SHL(x, n) | (x >> (32 - n));
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/// <summary>
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/// 将密钥逆序
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/// </summary>
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/// <param name="sk"></param>
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/// <param name="i"></param>
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private static void Swap(long[] sk, int i) => (sk[i], sk[31 - i]) = (sk[31 - i], sk[i]);
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/// <summary>
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/// Sm4的S盒取值
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/// </summary>
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/// <param name="inch"></param>
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/// <returns></returns>
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private byte SBox(byte inch) => SBoxTable[inch & 0xFF];
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/// <summary>
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/// 线性变换 L
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/// </summary>
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/// <param name="ka"></param>
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/// <returns></returns>
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private long Lt(long ka)
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{
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var a = new byte[4];
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var b = new byte[4];
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PutULongToBe(ka, a, 0);
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b[0] = SBox(a[0]);
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b[1] = SBox(a[1]);
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b[2] = SBox(a[2]);
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b[3] = SBox(a[3]);
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var bb = GetULongByBe(b, 0);
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return bb ^ RotL(bb, 2) ^ RotL(bb, 10) ^ RotL(bb, 18) ^ RotL(bb, 24);
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}
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/// <summary>
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/// 轮函数 F
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/// </summary>
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/// <param name="x0"></param>
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/// <param name="x1"></param>
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/// <param name="x2"></param>
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/// <param name="x3"></param>
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/// <param name="rk"></param>
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/// <returns></returns>
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private long F(long x0, long x1, long x2, long x3, long rk) => x0 ^ Lt(x1 ^ x2 ^ x3 ^ rk);
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/// <summary>
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/// 轮密钥rk
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/// </summary>
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/// <param name="ka"></param>
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/// <returns></returns>
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private long CalcRK(long ka)
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{
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var a = new byte[4];
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var b = new byte[4];
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PutULongToBe(ka, a, 0);
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b[0] = SBox(a[0]);
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b[1] = SBox(a[1]);
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b[2] = SBox(a[2]);
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b[3] = SBox(a[3]);
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var bb = GetULongByBe(b, 0);
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return bb ^ RotL(bb, 13) ^ RotL(bb, 23);
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}
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/// <summary>
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/// 加密密钥
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/// </summary>
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/// <param name="SK"></param>
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/// <param name="key"></param>
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private void SetKey(long[] SK, byte[] key)
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{
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var MK = new long[4];
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var k = new long[36];
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var i = 0;
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MK[0] = GetULongByBe(key, 0);
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MK[1] = GetULongByBe(key, 4);
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MK[2] = GetULongByBe(key, 8);
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MK[3] = GetULongByBe(key, 12);
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k[0] = MK[0] ^ FK[0];
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k[1] = MK[1] ^ FK[1];
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k[2] = MK[2] ^ FK[2];
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k[3] = MK[3] ^ FK[3];
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for (; i < 32; i++)
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{
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k[i + 4] = k[i] ^ CalcRK(k[i + 1] ^ k[i + 2] ^ k[i + 3] ^ CK[i]);
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SK[i] = k[i + 4];
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}
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}
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/// <summary>
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/// 解密函数
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/// </summary>
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/// <param name="sk">轮密钥</param>
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/// <param name="input">输入分组的密文</param>
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/// <param name="output">输出的对应的分组明文</param>
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private void OneRound(long[] sk, byte[] input, byte[] output)
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{
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var i = 0;
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var ul_buf = new long[36];
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ul_buf[0] = GetULongByBe(input, 0);
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ul_buf[1] = GetULongByBe(input, 4);
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ul_buf[2] = GetULongByBe(input, 8);
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ul_buf[3] = GetULongByBe(input, 12);
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while (i < 32)
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{
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ul_buf[i + 4] = F(ul_buf[i], ul_buf[i + 1], ul_buf[i + 2], ul_buf[i + 3], sk[i]);
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i++;
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}
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PutULongToBe(ul_buf[35], output, 0);
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PutULongToBe(ul_buf[34], output, 4);
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PutULongToBe(ul_buf[33], output, 8);
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PutULongToBe(ul_buf[32], output, 12);
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}
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/// <summary>
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/// 补足 16 进制字符串的 0 字符，返回不带 0x 的16进制字符串
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/// </summary>
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/// <param name="input"></param>
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/// <param name="mode">1表示加密，0表示解密</param>
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/// <returns></returns>
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private static byte[] Padding(byte[] input, Sm4Mode mode)
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{
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byte[] ret;
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if (mode is Sm4Mode.Encrypt)
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{
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var p = 16 - input.Length % 16;
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ret = new byte[input.Length + p];
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Array.Copy(input, 0, ret, 0, input.Length);
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for (var i = 0; i < p; i++)
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{
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ret[input.Length + i] = (byte)p;
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}
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}
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else
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{
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int p = input[^1];
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ret = new byte[input.Length - p];
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Array.Copy(input, 0, ret, 0, input.Length - p);
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}
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return ret;
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}
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/// <summary>
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/// 设置加密的key
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/// </summary>
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/// <param name="ctx"></param>
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/// <param name="key"></param>
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internal void SetKeyEnc(Sm4Context ctx, byte[] key)
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{
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ctx.Mode = Sm4Mode.Encrypt;
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SetKey(ctx.Key, key);
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}
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/// <summary>
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/// 设置解密的key
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/// </summary>
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/// <param name="ctx"></param>
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/// <param name="key"></param>
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internal void SetKeyDec(Sm4Context ctx, byte[] key)
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{
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ctx.Mode = Sm4Mode.Decrypt;
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SetKey(ctx.Key, key);
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for (var i = 0; i < 16; i++)
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{
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Swap(ctx.Key, i);
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}
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}
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internal byte[] ECB(Sm4Context ctx, byte[] input)
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{
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if (ctx is { IsPadding: true, Mode: Sm4Mode.Encrypt })
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{
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input = Padding(input, Sm4Mode.Encrypt);
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}
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var length = input.Length;
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var bins = new byte[length];
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Array.Copy(input, 0, bins, 0, length);
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var bous = new byte[length];
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for (var i = 0; length > 0; length -= 16, i++)
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{
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var inBytes = new byte[16];
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var outBytes = new byte[16];
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Array.Copy(bins, i * 16, inBytes, 0, length > 16 ? 16 : length);
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OneRound(ctx.Key, inBytes, outBytes);
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Array.Copy(outBytes, 0, bous, i * 16, length > 16 ? 16 : length);
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}
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if (ctx is { IsPadding: true, Mode: Sm4Mode.Decrypt })
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{
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bous = Padding(bous, Sm4Mode.Decrypt);
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}
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return bous;
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}
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internal byte[] CBC(Sm4Context ctx, byte[] iv, byte[] input)
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{
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if (ctx is { IsPadding: true, Mode: Sm4Mode.Encrypt }) input = Padding(input, Sm4Mode.Encrypt);
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var length = input.Length;
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var bins = new byte[length];
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Array.Copy(input, 0, bins, 0, length);
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var bousList = new List<byte>();
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int i;
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if (ctx.Mode is Sm4Mode.Encrypt)
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{
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for (var j = 0; length > 0; length -= 16, j++)
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{
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var inBytes = new byte[16];
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var outBytes = new byte[16];
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var out1 = new byte[16];
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Array.Copy(bins, j * 16, inBytes, 0, length > 16 ? 16 : length);
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for (i = 0; i < 16; i++)
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{
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outBytes[i] = (byte)(inBytes[i] ^ iv[i]);
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}
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OneRound(ctx.Key, outBytes, out1);
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Array.Copy(out1, 0, iv, 0, 16);
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for (var k = 0; k < 16; k++)
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{
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bousList.Add(out1[k]);
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}
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}
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}
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else
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{
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var temp = new byte[16];
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for (var j = 0; length > 0; length -= 16, j++)
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{
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var inBytes = new byte[16];
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var outBytes = new byte[16];
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var out1 = new byte[16];
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Array.Copy(bins, j * 16, inBytes, 0, length > 16 ? 16 : length);
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Array.Copy(inBytes, 0, temp, 0, 16);
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OneRound(ctx.Key, inBytes, outBytes);
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for (i = 0; i < 16; i++)
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{
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out1[i] = (byte)(outBytes[i] ^ iv[i]);
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}
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Array.Copy(temp, 0, iv, 0, 16);
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for (var k = 0; k < 16; k++)
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{
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bousList.Add(out1[k]);
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}
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}
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}
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return ctx is { IsPadding: true, Mode: Sm4Mode.Decrypt } ? Padding(bousList.ToArray(), Sm4Mode.Decrypt) : bousList.ToArray();
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}
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}
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