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