c语言实现sha1加密代码,不使用openssl
时间: 2024-09-06 18:02:18 浏览: 39
SHA-1(安全散列算法1)是一种密码散列函数,产生一个160位(20字节)的散列值,用于确保信息传输完整一致。在C语言中实现SHA-1加密不使用外部库如OpenSSL,可以通过直接实现SHA-1算法来完成。下面是一个简化的SHA-1加密算法的C语言实现示例:
```c
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
// 定义四个辅助函数
#define SHABLK0(i) (W[i] = data[i<<2] ^ data[(i<<2)+1] ^ data[(i<<2)+2] ^ data[(i<<2)+3])
#define SHABLK(i) (W[i&15] ^ W[(i-3)&15])
#define循环左移(n,x) (((x) << (n)) | ((x) >> (32-(n))))
#define CH(x,y,z) ((x & y) ^ (~x & z))
#define PARITY(x,y,z) ((x ^ y) ^ z)
#define Maj(x,y,z) ((x & y) ^ (x & z) ^ (y & z))
// SHA-1 初始化
void SHA1Init(uint32_t* state) {
state[0] = 0x67452301;
state[1] = 0xefcdab89;
state[2] = 0x98badcfe;
state[3] = 0x10325476;
state[4] = 0xc3d2e1f0;
}
// SHA-1 迭代处理
void SHA1Transform(uint32_t state[5], const uint8_t buffer[64]) {
uint32_t W[16], a, b, c, d, e;
int i;
for (i = 0; i < 16; i++)
W[i] = ((uint32_t)buffer[4*i]) << 24 | ((uint32_t)buffer[4*i+1]) << 16 |
((uint32_t)buffer[4*i+2]) << 8 | ((uint32_t)buffer[4*i+3]);
for (i = 16; i < 80; i++)
W[i] =循环左移(1, W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16]);
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = state[4];
for (i = 0; i < 20; i++) {
e +=循环左移(5, a) + CH(b, c, d) + 0x5a827999 + W[i];
b =循环左移(30, b);
}
for (i = 20; i < 40; i++) {
e +=循环左移(5, a) + PARITY(b, c, d) + 0x6ed9eba1 + W[i];
b =循环左移(30, b);
}
for (i = 40; i < 60; i++) {
e +=循环左移(5, a) + Maj(b, c, d) + 0x8f1bbcdc + W[i];
b =循环左移(30, b);
}
for (i = 60; i < 80; i++) {
e +=循环左移(5, a) + PARITY(b, c, d) + 0xca62c1d6 + W[i];
b =循环左移(30, b);
}
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
}
// SHA-1 加密处理
void SHA1Update(uint32_t state[5], const uint8_t* buffer, uint32_t count) {
uint32_t data[16];
int i;
for (i = 0; i < count; i++) {
data[i>>2] = (buffer[i] << 24) | ((uint32_t)buffer[i+1] << 16) |
((uint32_t)buffer[i+2] << 8) | (buffer[i+3]);
if ((i & 63) == 63) {
SHA1Transform(state, data);
data[0] = 0;
data[1] = 0;
data[2] = 0;
data[3] = 0;
data[14] = 0;
data[15] = 0;
}
}
}
// SHA-1 最终处理和输出
void SHA1Final(uint8_t digest[20], uint32_t state[5]) {
uint32_t data[16];
uint32_t count = 0;
int i;
data[14] = count>>29 | (count << 3);
data[15] = count << 3;
for (i = 0; i < 14; i++) {
data[i>>2] = (digest[i] << 24) | ((uint32_t)digest[i+1] << 16) |
((uint32_t)digest[i+2] << 8) | (digest[i+3]);
}
SHA1Transform(state, data);
for (i = 0; i < 20; i++)
digest[i] = (state[i>>2] >> ((3-(i & 3)) * 8)) & 0xff;
}
int main() {
// 示例使用
uint8_t digest[20];
uint32_t state[5];
char input[] = "The quick brown fox jumps over the lazy dog";
SHA1Init(state);
SHA1Update(state, (uint8_t*)input, strlen(input));
SHA1Final(digest, state);
for (int i = 0; i < 20; i++)
printf("%02x", digest[i]);
printf("\n");
return 0;
}
```
上述代码展示了如何使用C语言实现SHA-1加密,其中包含了SHA-1算法的核心步骤。这只是一个简化版的实现,不包含输入数据的填充和分块处理,实际使用时需要根据需要进行适当的调整和补充。
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