sm3 加密 c 源代码

SM3是中国国家密码管理局发布的一种密码算法，被广泛应用于数字签名、电子邮件安全、安全支付等领域。以下是一个示例的SM3加密C源代码：

#include <stdio.h>
#include <string.h>

typedef unsigned char BYTE;
typedef unsigned long long UINT64;
typedef unsigned long UINT32;

#define FF(X, Y, Z) ((X) ^ (Y) ^ (Z))
#define GG(X, Y, Z) (((X) & (Y)) | ((X) & (Z)) | ((Y) & (Z)))

#define ROTL(X, n) (((X) << (n)) | ((X) >> (32 - (n))))

const UINT32 T[64] = {
    0x79cc4519, 0xf3988a32, 0xe38cb14b, 0xeac02d03, 0x4cce963d, 0xc5fdef28, 0x1f2fce41, 0x3ec93f5a,
    0x97a3e243, 0xdc3db448, 0xd1f4acb1, 0x16a4e635, 0x135ccb0e, 0x46ecd320, 0x79cc4519, 0x536fd9a0,
    0x3c8eed39, 0xfd339fa2, 0xcdaf722b, 0x283d3b14, 0x2e8f9b0d, 0xbc72c230, 0xb88f9f59, 0xfdfbcd22,
    0x3d43106b, 0x5c4dd124, 0x76bcdf9d, 0x989141d6, 0xe4ccebaf, 0x5ed26898, 0x3f6314b1, 0x92cc39e8,
    0x0d4a8551, 0xff126808, 0x44c131f1, 0x85efc719, 0x7703e3e0, 0xa2f77db9, 0x0a759c12, 0x8db7a5fb,
    0x8007fbde, 0x4352d310, 0x1120e333, 0x1d95d49c, 0xa82b34e5, 0x89e4d0cc, 0x36efd4f7, 0xb6ac4b3e,
    0x844e5787, 0x7609e918, 0xe345e16f, 0x28c21413, 0x2a8f9b1a, 0x8ff6e1f3, 0xb9ec857c, 0x891b8c65,
    0x5873f2bd, 0xbde6cc75, 0xcaeefd5e, 0x76f988da, 0x0bf8f6b1, 0x70e44324, 0xe9d4fdae, 0xdabe6d5d
};

void SM3Padding(BYTE *input, UINT32 inLen, BYTE *output, UINT32 *outLen) {
    UINT32 paddingLen = (448 - ((inLen * 8) % 512) + 512) % 512;
    *outLen = inLen + paddingLen / 8 + 32;
    memcpy(output, input, inLen);
    output[inLen] = 0x80;
    for (UINT32 i = inLen + 1; i < *outLen - 32; i++) {
        output[i] = 0;
    }
    UINT64 lengthBits = inLen * 8;
    output[*outLen - 32] = (lengthBits >> 56) & 0xff;
    output[*outLen - 31] = (lengthBits >> 48) & 0xff;
    output[*outLen - 30] = (lengthBits >> 40) & 0xff;
    output[*outLen - 29] = (lengthBits >> 32) & 0xff;
    output[*outLen - 28] = (lengthBits >> 24) & 0xff;
    output[*outLen - 27] = (lengthBits >> 16) & 0xff;
    output[*outLen - 26] = (lengthBits >> 8) & 0xff;
    output[*outLen - 25] = lengthBits & 0xff;
}

void SM3Hash(BYTE *input, UINT32 inLen, BYTE *output) {
    BYTE padding[64];
    UINT32 paddingLen;
    SM3Padding(input, inLen, padding, &paddingLen);

    UINT32 n = paddingLen / 64;
    BYTE B[64];
    UINT32 V[8], W[68], W1[64];
    for (int i = 0; i < 8; i++) {
        V[i] = 0x7380166f;
    }
    for (UINT32 i = 0; i < n; i++) {
        memcpy(B, padding + i * 64, 64);
        for (int j = 0; j < 16; j++) {
            W[j] = (B[j * 4] << 24) | (B[j * 4 + 1] << 16) | (B[j * 4 + 2] << 8) | B[j * 4 + 3];
        }
        for (int j = 16; j < 68; j++) {
            W[j] = ROTL(W[j - 16] ^ W[j - 9] ^ (ROTL(W[j - 3], 15)), 1) ^ (ROTL(W[j - 13], 7)) ^ W[j - 6];
        }
        for (int j = 0; j < 64; j++) {
            W1[j] = W[j] ^ W[j + 4];
        }
        UINT32 A = V[0], B = V[1], C = V[2], D = V[3], E = V[4], F = V[5], G = V[6], H = V[7];
        for (int j = 0; j < 64; j++) {
            UINT32 SS1 = ROTL((ROTL(A, 12) + E + ROTL(T[j], j % 32)), 7);
            UINT32 SS2 = SS1 ^ ROTL(A, 12);
            UINT32 TT1 = FF(A, B, C) + D + SS2 + W1[j];
            UINT32 TT2 = GG(E, F, G) + H + SS1 + W[j];
            D = C;
            C = ROTL(B, 9);
            B = A;
            A = TT1;
            H = G;
            G = ROTL(F, 19);
            F = E;
            E = P0(TT2);
        }
        V[0] ^= A;
        V[1] ^= B;
        V[2] ^= C;
        V[3] ^= D;
        V[4] ^= E;
        V[5] ^= F;
        V[6] ^= G;
        V[7] ^= H;
    }
    for (int i = 0; i < 8; i++) {
        output[i * 4] = (V[i] >> 24) & 0xff;
        output[i * 4 + 1] = (V[i] >> 16) & 0xff;
        output[i * 4 + 2] = (V[i] >> 8) & 0xff;
        output[i * 4 + 3] = V[i] & 0xff;
    }
}

int main() {
    BYTE input[] = "abc";
    BYTE output[32];

    SM3Hash(input, strlen((char *)input), output);

    printf("SM3 Hash: ");
    for (int i = 0; i < 32; i++) {
        printf("%02x", output[i]);
    }
    printf("\n");

    return 0;
}

该代码实现了SM3密码算法的关键部分，其中包括了填充函数SM3Padding和哈希函数SM3Hash。代码中使用了旋转左移运算(ROTL)，逻辑运算以及位运算等操作实现了SM3算法的各个步骤。在main函数中，我们以 "abc" 的输入为例进行加密，得到输出结果作为SM3的哈希值。