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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:
#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; }
另外提供两段代码供参考:
方法一:
#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:
#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