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signature=62582070c85d13c037b1e326ef81e6e7,APS

萌宠菠菠乐园
2024-10-11 15:32

以下是基于BS模式的SHA-256算法文件完整性程序的C语言实现： ```c #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdint.h> #define ROTL(x, n) (((x) << (n)) | ((x) >> (32 - (n)))) #define ROTR(x, n) (((x) >> (n)) | ((x) << (32 - (n)))) #define SHR(x, n) ((x) >> (n)) #define CH(x, y, z) (((x) & (y)) ^ (~(x) & (z))) #define MAJ(x, y, z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z))) #define EP0(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22)) #define EP1(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25)) #define SIG0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHR(x, 3)) #define SIG1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHR(x, 10)) static const uint32_t K[64] = { 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 }; static void sha256_transform(uint32_t state[8], const uint8_t data[64]) { uint32_t a, b, c, d, e, f, g, h, i, j, t1, t2, m[64]; for (i=0, j=0; i<16; ++i, j+=4) m[i] = (data[j] << 24) | (data[j+1] << 16) | (data[j+2] << 8) | (data[j+3]); for (; i<64; ++i) m[i] = SIG1(m[i-2]) + m[i-7] + SIG0(m[i-15]) + m[i-16]; a = state[0]; b = state[1]; c = state[2]; d = state[3]; e = state[4]; f = state[5]; g = state[6]; h = state[7]; for (i=0; i<64; ++i) { t1 = h + EP1(e) + CH(e, f, g) + K[i] + m[i]; t2 = EP0(a) + MAJ(a, b, c); h = g; g = f; f = e; e = d + t1; d = c; c = b; b = a; a = t1 + t2; } state[0] += a; state[1] += b; state[2] += c; state[3] += d; state[4] += e; state[5] += f; state[6] += g; state[7] += h; } void sha256(const uint8_t *msg, size_t len, uint8_t hash[32]) { uint32_t state[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 }; uint8_t data[64]; size_t i, j; for (i=0; i<len; ++i) { if ((i & 63) == 0 && i > 0) sha256_transform(state, data); j = i & 63; data[j] = msg[i]; } j = i & 63; data[j++] = 0x80; if (j > 56) { memset(data+j, 0, 64-j); sha256_transform(state, data); j = 0; } memset(data+j, 0, 56-j); uint64_t bitlen = (uint64_t)len * 8; data[56] = (bitlen >> 56) & 0xff; data[57] = (bitlen >> 48) & 0xff; data[58] = (bitlen >> 40) & 0xff; data[59] = (bitlen >> 32) & 0xff; data[60] = (bitlen >> 24) & 0xff; data[61] = (bitlen >> 16) & 0xff; data[62] = (bitlen >> 8) & 0xff; data[63] = bitlen & 0xff; sha256_transform(state, data); for (i=0; i<8; ++i) { hash[i*4] = (state[i] >> 24) & 0xff; hash[i*4+1] = (state[i] >> 16) & 0xff; hash[i*4+2] = (state[i] >> 8) & 0xff; hash[i*4+3] = state[i] & 0xff; } } int main(int argc, char **argv) { if (argc < 2) { printf("Usage: %s <filename>n", argv[0]); return 1; } FILE *fp = fopen(argv[1], "rb"); if (!fp) { printf("Unable to open file: %sn", argv[1]); return 1; } fseek(fp, 0L, SEEK_END); size_t size = ftell(fp); rewind(fp); uint8_t *buf = (uint8_t*)malloc(size); if (!buf) { printf("Unable to allocate memoryn"); fclose(fp); return 1; } if (fread(buf, 1, size, fp) != size) { printf("Unable to read file: %sn", argv[1]); fclose(fp); free(buf); return 1; } uint8_t hash[32]; sha256(buf, size, hash); printf("SHA-256 hash of %s:n", argv[1]); for (int i=0; i<32; ++i) printf("%02x", hash[i]); printf("n"); free(buf); fclose(fp); return 0; } ``` 该程序使用了BS模式，对文件进行SHA-256算法计算，并输出计算结果。用户可以在命令行中指定要计算哈希值的文件，程序会打开文件并读取其中的内容，然后对内容进行哈希计算。计算结果以16进制形式输出。