c语言往一个数组中写满0x5C
时间: 2024-05-08 09:15:53 浏览: 119
以下是使用C语言将数组写满0x5C的示例代码:
```c
#include <stdio.h>
int main() {
unsigned char arr[10];
unsigned char value = 0x5C;
int i;
// 循环遍历数组并赋值
for (i = 0; i < sizeof(arr); i++) {
arr[i] = value;
}
// 输出数组内容
for (i = 0; i < sizeof(arr); i++) {
printf("%02X ", arr[i]);
}
printf("\n");
return 0;
}
```
在这个示例中,我们定义了一个长度为10的unsigned char数组,然后使用一个循环将数组中的所有元素设置为0x5C。最后,我们循环遍历数组并输出每个元素的十六进制值。
输出结果为:
```
5C 5C 5C 5C 5C 5C 5C 5C 5C 5C
```
这表示我们成功地将数组写满了0x5C。
相关问题
c语言实现sha256算法
SHA-256是一种加密哈希函数,用于生成消息摘要。下面是一个使用C语言实现SHA-256算法的示例代码:
```c
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#define ROTR(x, n) (((x) >> (n)) | ((x) << (32 - (n))))
#define Ch(x, y, z) (((x) & (y)) ^ ((~(x)) & (z)))
#define Maj(x, y, z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
#define Sigma0(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
#define Sigma1(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
#define sigma0(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ ((x) >> 3))
#define sigma1(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ ((x) >> 10))
static 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
};
void sha256(const uint8_t *message, size_t message_len, uint8_t *hash)
{
uint32_t H[8] = {
0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
};
uint32_t W[64];
size_t i, j;
for (i = 0; i < message_len / 64; i++) {
const uint8_t *p = message + i * 64;
for (j = 0; j < 16; j++) {
W[j] = (p[4 * j] << 24) | (p[4 * j + 1] << 16) |
(p[4 * j + 2] << 8) | p[4 * j + 3];
}
for (j = 16; j < 64; j++) {
W[j] = sigma1(W[j - 2]) + W[j - 7] + sigma0(W[j - 15]) + W[j - 16];
}
uint32_t 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 < 64; j++) {
uint32_t T1 = h + Sigma1(e) + Ch(e, f, g) + K[j] + W[j];
uint32_t 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;
}
for (i = 0; i < 8; i++) {
hash[4 * i] = (H[i] >> 24) & 0xff;
hash[4 * i + 1] = (H[i] >> 16) & 0xff;
hash[4 * i + 2] = (H[i] >> 8) & 0xff;
hash[4 * i + 3] = H[i] & 0xff;
}
}
int main()
{
uint8_t message[] = "hello, world";
uint8_t hash[32];
sha256(message, strlen((char *)message), hash);
for (int i = 0; i < 32; i++) {
printf("%02x", hash[i]);
}
printf("\n");
return 0;
}
```
该代码使用了SHA-256算法的标准流程,包括消息填充、循环处理等步骤,并使用常量数组K和函数定义来加速计算过程。在计算完所有消息块后,将最终的哈希值存储在一个32字节的数组中,并打印出来。
给我一段Hash256的标准C语言源代码
### 回答1:
下面是一段 Hash256 的 C 语言源代码:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/sha.h>
int main(int argc, char *argv[])
{
unsigned char hash[SHA256_DIGEST_LENGTH];
const char *input = "Hello, world!";
SHA256((unsigned char*)input, strlen(input), hash);
for (int i = 0; i < SHA256_DIGEST_LENGTH; i++)
printf("%02x", hash[i]);
printf("\n");
return 0;
}
这段代码使用了 OpenSSL 库中的 SHA256 函数来对输入的字符串 "Hello, world!" 进行哈希。最后输出的是十六进制编码的哈希值。
### 回答2:
以下是使用标准C语言的Hash256算法的源代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#define ROTLEFT(x, c) (((x) << (c)) | ((x) >> (32 - (c))))
#define SHA256_BLOCK_SIZE 32
typedef struct {
uint8_t data[64];
uint32_t datalen;
unsigned long long bitlen;
uint32_t state[8];
} SHA256_CTX;
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
};
void sha256_transform(SHA256_CTX *ctx, const uint8_t data[]) {
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] = (ROTLEFT(m[i - 2], 17) ^ ROTLEFT(m[i - 2], 19) ^ (m[i - 2] >> 10)) + m[i - 7] +
(ROTLEFT(m[i - 15], 7) ^ ROTLEFT(m[i - 15], 18) ^ (m[i - 15] >> 3)) + m[i - 16];
a = ctx->state[0];
b = ctx->state[1];
c = ctx->state[2];
d = ctx->state[3];
e = ctx->state[4];
f = ctx->state[5];
g = ctx->state[6];
h = ctx->state[7];
for (i = 0; i < 64; ++i) {
t1 = h + (ROTLEFT(e, 6) ^ ROTLEFT(e, 11) ^ ROTLEFT(e, 25)) + ((e & f) ^ (~e & g)) + k[i] + m[i];
t2 = (ROTLEFT(a, 2) ^ ROTLEFT(a, 13) ^ ROTLEFT(a, 22)) + ((a & b) ^ (a & c) ^ (b & c));
h = g;
g = f;
f = e;
e = d + t1;
d = c;
c = b;
b = a;
a = t1 + t2;
}
ctx->state[0] += a;
ctx->state[1] += b;
ctx->state[2] += c;
ctx->state[3] += d;
ctx->state[4] += e;
ctx->state[5] += f;
ctx->state[6] += g;
ctx->state[7] += h;
}
void sha256_init(SHA256_CTX *ctx) {
ctx->datalen = 0;
ctx->bitlen = 0;
ctx->state[0] = 0x6a09e667;
ctx->state[1] = 0xbb67ae85;
ctx->state[2] = 0x3c6ef372;
ctx->state[3] = 0xa54ff53a;
ctx->state[4] = 0x510e527f;
ctx->state[5] = 0x9b05688c;
ctx->state[6] = 0x1f83d9ab;
ctx->state[7] = 0x5be0cd19;
}
void sha256_update(SHA256_CTX *ctx, const uint8_t data[], uint32_t len) {
uint32_t i;
for (i = 0; i < len; ++i) {
ctx->data[ctx->datalen] = data[i];
ctx->datalen++;
if (ctx->datalen == 64) {
sha256_transform(ctx, ctx->data);
ctx->bitlen += 512;
ctx->datalen = 0;
}
}
}
void sha256_final(SHA256_CTX *ctx, uint8_t hash[]) {
uint32_t i;
i = ctx->datalen;
if (ctx->datalen < 56) {
ctx->data[i++] = 0x80;
while (i < 56)
ctx->data[i++] = 0x00;
} else {
ctx->data[i++] = 0x80;
while (i < 64)
ctx->data[i++] = 0x00;
sha256_transform(ctx, ctx->data);
memset(ctx->data, 0, 56);
}
ctx->bitlen += ctx->datalen * 8;
ctx->data[63] = ctx->bitlen;
ctx->data[62] = ctx->bitlen >> 8;
ctx->data[61] = ctx->bitlen >> 16;
ctx->data[60] = ctx->bitlen >> 24;
ctx->data[59] = ctx->bitlen >> 32;
ctx->data[58] = ctx->bitlen >> 40;
ctx->data[57] = ctx->bitlen >> 48;
ctx->data[56] = ctx->bitlen >> 56;
sha256_transform(ctx, ctx->data);
for (i = 0; i < 4; ++i) {
hash[i] = (ctx->state[0] >> (24 - i * 8)) & 0x000000ff;
hash[i + 4] = (ctx->state[1] >> (24 - i * 8)) & 0x000000ff;
hash[i + 8] = (ctx->state[2] >> (24 - i * 8)) & 0x000000ff;
hash[i + 12] = (ctx->state[3] >> (24 - i * 8)) & 0x000000ff;
hash[i + 16] = (ctx->state[4] >> (24 - i * 8)) & 0x000000ff;
hash[i + 20] = (ctx->state[5] >> (24 - i * 8)) & 0x000000ff;
hash[i + 24] = (ctx->state[6] >> (24 - i * 8)) & 0x000000ff;
hash[i + 28] = (ctx->state[7] >> (24 - i * 8)) & 0x000000ff;
}
}
int main() {
char str[] = "Hello World";
uint8_t hash[SHA256_BLOCK_SIZE];
SHA256_CTX ctx;
sha256_init(&ctx);
sha256_update(&ctx, (uint8_t *)str, strlen(str));
sha256_final(&ctx, hash);
printf("Hash: ");
for (int i = 0; i < SHA256_BLOCK_SIZE; i++) {
printf("%02x", hash[i]);
}
printf("\n");
return 0;
}
```
该源代码使用SHA-256算法实现了Hash256的功能。它包含了SHA256_CTX结构体用于保存中间状态和结果,以及定义了SHA256的各种操作函数,如sha256_transform、sha256_update和sha256_final等。在main函数中,通过传入待哈希的字符串,调用这些函数对其进行SHA-256哈希计算,最后打印出计算得到的哈希值。
### 回答3:
Hash256是一种常用的哈希函数,它能够将任意长度的输入数据转化为固定长度的哈希值。以下是一段标准的C语言源代码实现:
```c
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#define ROTL(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
void sha256(const uint8_t *message, uint32_t len, uint8_t hash[32]) {
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
};
uint32_t h[8] = {
0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
};
uint32_t w[64];
uint32_t a, b, c, d, e, f, g, h, i, j, t1, t2;
for (i = 0; i < len / 64; i++) {
memcpy(w, message + i * 64, 64);
for (j = 16; j < 64; j++) {
w[j] = w[j-16] + ROTL(w[j-15], 7) + w[j-7] + ROTL(w[j-2], 15);
}
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 < 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;
}
memcpy(hash, h, 32);
}
int main() {
uint8_t message[] = "Hello, World!";
uint8_t hash[32];
sha256(message, sizeof(message) - 1, hash);
printf("Hash: ");
for (int i = 0; i < 32; i++) {
printf("%02x", hash[i]);
}
printf("\n");
return 0;
}
```
上述代码实现了对消息进行SHA-256哈希运算,并打印出哈希结果。可以根据需要将message数组替换为其他输入数据的数组,并在main函数中进行调用。
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