Linux下openssl提供了一系列哈希及加密的函数，如果调用openssl提供的MD5函数生成任意字符串的MD5呢？下面提供了一段代码实现Linux下c字符串生成md5的函数。
具体代码:
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#include "stdio.h"#include <string.h>#include <stdlib.h>#include <openssl/md5.h>int get_md5( char *input, char *output){ char password[1024*1024*5]={0}; MD5_CTX x; int i = 0, len; char *out = NULL; unsigned char d[16]; unsigned char tmp[128] = { 0 }; strcpy (password,input); MD5_Init(&x); MD5_Update(&x, ( char *)password, strlen (password)); MD5_Final(d, &x); out = ( char *) malloc (35); memset (out, 0x00, 35); strcpy (out, "$1$" ); // printf("MD5(\"%s\") = ", password); for (i = 0; i < 16; i++) { sprintf (out + (i*2), "%02X" , d[i]); // 转换为32位 } out[32] = 0; // printf("%s\n", out); strcpy (output,out); free (out); return 0;} |
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另外提供两段代码供参考:
方法一：
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#include<stdio.h>#include<openssl/md5.h>#include<string.h>int main( int argc, char **argv ){MD5_CTX ctx;unsigned char *data= "123" ;unsigned char md[16];char buf[33]={ '\0' };char tmp[3]={ '\0' };int i;MD5_Init(&ctx);MD5_Update(&ctx,data, strlen (data));MD5_Final(md,&ctx);for ( i=0; i<16; i++ ){sprintf (tmp, "%02X" ,md[i]);strcat (buf,tmp);}printf ( "%s\n" ,buf);return 0;} |
输出：
202CB962AC59075B964B07152D234B70
方法二：
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#include<stdio.h>#include<openssl/md5.h>#include<string.h>int main( int argc, char **argv ){unsigned char *data = "123" ;unsigned char md[16];int i;char tmp[3]={ '\0' },buf[33]={ '\0' };MD5(data, strlen (data),md);for (i = 0; i < 16; i++){sprintf (tmp, "%2.2x" ,md[i]);strcat (buf,tmp);}printf ( "%s\n" ,buf);return 0;} |
输出：
202cb962ac59075b964b07152d234b70