墨迹的Blog使用openssl做md5,sha,hmac加密
Publish: January 17, 2019 Category: C/C++ No Comments
依赖openssl, 所以确保安装了openssl-devel库
ctcrypt.c:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <openssl/md5.h>
#include <openssl/sha.h>
#include <openssl/conf.h>
#include <openssl/hmac.h>
#include <openssl/evp.h>
/*
* @param in_str 需要md5的源字符串
* @param in_str_len 源字符串的长度
* @param out_str 保存md5后的字符串buf
* @param out_str_size out_str的空间长度
*
* @return 0 成功 1 失败
*/
int ct_md5(char *in_str, size_t in_str_len, char *out_str, size_t out_str_size)
{
MD5_CTX hash_ctx;
unsigned char hash_ret[16];
int i;
if (*in_str == '\0' || in_str_len == 0) {
return 1;
}
// initialize a hash context
if (MD5_Init(&hash_ctx) == 0) {
return 1;
}
// update the input string to the hash context (you can update
// more string to the hash context)
if (MD5_Update(&hash_ctx, in_str, in_str_len) == 0) {
return 1;
}
// compute the hash result
if (MD5_Final(hash_ret, &hash_ctx) == 0) {
return 1;
}
char *pout = out_str;
int pout_len = 0;
for (i=0; i<32; i++) {
if (i%2 == 0) {
pout_len += snprintf(pout+pout_len, out_str_size - pout_len, "%x", (hash_ret[i/2] >> 4) & 0xf);
} else {
pout_len += snprintf(pout+pout_len, out_str_size - pout_len, "%x", (hash_ret[i/2]) & 0xf);
}
}
return 0;
}
/*
* sha1加密
* @param in_str 需要sha1的源字符串
* @param in_str_len 源字符串的长度
* @param out_str 保存sha1后的字符串buf
* @param out_str_size out_str的空间长度
*
* @return 0 成功 1 失败
*/
int ct_sha1(char *in_str, size_t in_str_len, char *out_str, size_t out_str_size)
{
SHA_CTX hash_ctx;
unsigned char hash_ret[20];
int i;
// initialize a hash context
if (SHA1_Init(&hash_ctx) == 0) {
return 1;
}
if (SHA1_Update(&hash_ctx, in_str, in_str_len) == 0) {
return 1;
}
if (SHA1_Final(hash_ret, &hash_ctx) == 0) {
return 1;
}
char *pout = out_str;
int pout_len = 0;
for (i=0; i<40; i++) {
if (i%2 == 0) {
pout_len += snprintf(pout+pout_len, out_str_size - pout_len, "%x", (hash_ret[i/2] >> 4) & 0xf);
} else {
pout_len += snprintf(pout+pout_len, out_str_size - pout_len, "%x", (hash_ret[i/2]) & 0xf);
}
}
return 0;
}
/*
* hash_hmac加密
* @param algo 使用hash的算法:
* md2, md4, md5, sha, sha1, dss, dss1, ecdsa, sha224,
* sha256, sha384, sha512, ripemd160, whirlpool
* @param data 被hash的数据
* @param data_len 被hash的数据的长度
* @param key Shared secret key used for generating the HMAC variant of the message digest.
* @param key_len key的长度
* @param out_data 保存hash后的字符串buf
* @param out_data_size out_data的空间长度
*
* @return 0 成功 1 失败
*/
int ct_hash_hmac(char *algo, char *data, size_t data_len, char *key, size_t key_len, char *out_data, size_t out_data_size)
{
HMAC_CTX *hash_ctx;
unsigned char hash_ret[20];
unsigned int hash_ret_len = 20;
int i;
const EVP_MD *evp_md;
if (algo == NULL) {
evp_md = EVP_md_null();
} else if (strcasecmp(algo, "md2") == 0) {
evp_md = EVP_md2();
} else if (strcasecmp(algo, "md4") == 0) {
evp_md = EVP_md4();
} else if (strcasecmp(algo, "md5") == 0) {
evp_md = EVP_md5();
} else if (strcasecmp(algo, "sha") == 0) {
evp_md = EVP_sha();
} else if (strcasecmp(algo, "sha1") == 0) {
evp_md = EVP_sha1();
} else if (strcasecmp(algo, "dss") == 0) {
evp_md = EVP_dss();
} else if (strcasecmp(algo, "dss1") == 0) {
evp_md = EVP_dss1();
} else if (strcasecmp(algo, "ecdsa") == 0) {
evp_md = EVP_ecdsa();
} else if (strcasecmp(algo, "sha224") == 0) {
evp_md = EVP_sha224();
} else if (strcasecmp(algo, "sha256") == 0) {
evp_md = EVP_sha256();
} else if (strcasecmp(algo, "sha384") == 0) {
evp_md = EVP_sha384();
} else if (strcasecmp(algo, "sha512") == 0) {
evp_md = EVP_sha512();
} else if (strcasecmp(algo, "ripemd160") == 0) {
evp_md = EVP_ripemd160();
} else if (strcasecmp(algo, "whirlpool") == 0) {
evp_md = EVP_whirlpool();
}
hash_ctx = HMAC_CTX_new();
HMAC_CTX_init(hash_ctx);
if (HMAC_Init_ex(hash_ctx, key, key_len, evp_md, NULL) == 0) {
return 1;
}
if (HMAC_Update(hash_ctx, (unsigned char *)data, data_len) == 0) {
return 1;
}
if (HMAC_Final(hash_ctx, hash_ret, &hash_ret_len) == 0) {
return 1;
}
HMAC_CTX_cleanup(hash_ctx);
HMAC_CTX_free(hash_ctx);
char *pout = out_data;
int pout_len = 0;
for (i=0; i<hash_ret_len; i++) {
pout_len += snprintf(pout+pout_len, out_data_size - pout_len, "%02x", (unsigned int)hash_ret[i]);
}
return 0;
}ctcrypt.h:
#ifndef _CTCRYPT_H_ #define _CTCRYPT_H_ /* * md5加密 * @param in_str 需要md5的源字符串 * @param in_str_len 源字符串的长度 * @param out_str 保存md5后的字符串buf * @param out_str_size out_str的空间长度 * * @return 0 成功 1 失败 */ int ct_md5(char *in_str, size_t in_str_len, char *out_str, size_t out_str_size); /* * sha1加密 * @param in_str 需要sha1的源字符串 * @param in_str_len 源字符串的长度 * @param out_str 保存sha1后的字符串buf * @param out_str_size out_str的空间长度 * * @return 0 成功 1 失败 */ int ct_sha1(char *in_str, size_t in_str_len, char *out_str, size_t out_str_size); /* * hash_hmac加密 * @param algo 使用hash的算法: * md2, md4, md5, sha, sha1, dss, dss1, ecdsa, sha224, * sha256, sha384, sha512, ripemd160, whirlpool * @param data 被hash的数据 * @param data_len 被hash的数据的长度 * @param key Shared secret key used for generating the HMAC variant of the message digest. * @param key_len key的长度 * @param out_data 保存hash后的字符串buf * @param out_data_size out_data的空间长度 * * @return 0 成功 1 失败 */ int ct_hash_hmac(char *algo, char *data, size_t data_len, char *key, size_t key_len, char *out_data, size_t out_data_size); #endif
sample.c:
/*
* 使用方法:
* # gcc -g -o sample sample.c -I/usr/include/ -L/usr/lib64/ -lcrypto
* # ./sample 'hello, world'
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "ctcrypt.h"
int main(int argc, char **argv)
{
char out_string[1024] = {0};
int ret = 0;
ret = ct_md5(argv[1], strlen(argv[1]), out_string, sizeof(out_string));
printf("md5 ret[%d]:%s\n", ret, out_string);
memset(out_string, 0, sizeof(out_string));
ret = ct_sha1(argv[1], strlen(argv[1]), out_string, sizeof(out_string));
printf("sha1 ret[%d]:%s\n", ret, out_string);
memset(out_string, 0, sizeof(out_string));
char key[] = "012345678";
ret = ct_hash_hmac("sha1", argv[1], strlen(argv[1]), key, strlen(key), out_string, sizeof(out_string));
printf("hmac ret[%d]:%s\n", ret, out_string);
return 0;
}