c语言编写sha256代码
时间: 2023-10-24 11:07:29 浏览: 42
以下是一个简单的C语言SHA-256实现示例:
```c
#include <stdio.h>
#include <stdint.h>
#include <string.h>
const uint32_t K[] = {
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
};
const uint32_t H[] = {
0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
};
uint32_t ROTR(uint32_t x, uint32_t n) {
return (x >> n) | (x << (32 - n));
}
uint32_t Ch(uint32_t x, uint32_t y, uint32_t z) {
return (x & y) ^ (~x & z);
}
uint32_t Maj(uint32_t x, uint32_t y, uint32_t z) {
return (x & y) ^ (x & z) ^ (y & z);
}
uint32_t Sigma0(uint32_t x) {
return ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22);
}
uint32_t Sigma1(uint32_t x) {
return ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25);
}
uint32_t sigma0(uint32_t x) {
return ROTR(x, 7) ^ ROTR(x, 18) ^ (x >> 3);
}
uint32_t sigma1(uint32_t x) {
return ROTR(x, 17) ^ ROTR(x, 19) ^ (x >> 10);
}
void sha256(uint8_t *msg, uint32_t len, uint32_t H[]) {
uint32_t W[64], a, b, c, d, e, f, g, h, i, j, T1, T2;
for (i = 0; i < len; i += 64) {
a = H[0];
b = H[1];
c = H[2];
d = H[3];
e = H[4];
f = H[5];
g = H[6];
h = H[7];
for (j = 0; j < 16; j++) {
W[j] = msg[i + j*4] << 24;
W[j] |= msg[i + j*4 + 1] << 16;
W[j] |= msg[i + j*4 + 2] << 8;
W[j] |= msg[i + j*4 + 3];
}
for (j = 16; j < 64; j++) {
W[j] = sigma1(W[j-2]) + W[j-7] + sigma0(W[j-15]) + W[j-16];
}
for (j = 0; j < 64; j++) {
T1 = h + Sigma1(e) + Ch(e, f, g) + K[j] + W[j];
T2 = Sigma0(a) + Maj(a, b, c);
h = g;
g = f;
f = e;
e = d + T1;
d = c;
c = b;
b = a;
a = T1 + T2;
}
H[0] += a;
H[1] += b;
H[2] += c;
H[3] += d;
H[4] += e;
H[5] += f;
H[6] += g;
H[7] += h;
}
}
int main() {
uint8_t msg[] = "hello, world!";
uint32_t len = strlen((char *)msg);
uint8_t digest[32];
sha256(msg, len, (uint32_t *)&H);
memcpy(digest, &H, 32);
printf("Message: %s\n", msg);
printf("Hash: ");
for (int i = 0; i < 32; i++) {
printf("%02x", digest[i]);
}
printf("\n");
return 0;
}
```
这个示例实现了一个简单的SHA-256哈希函数,可以对输入的字符串进行哈希并输出结果。请注意,在实际使用中,SHA-256应该用于更复杂和安全的方式。