使用openssl实现md5加密

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OpenSSL 是一个强大的安全套接字层密码库，囊括主要的密码算法、常用的密钥和证书封装管理功能及SSL协议，并提供丰富的应用程序供测试或其它目的使用。

要使用openssl，首先安装openssl库

apt-get install openssl  libssl-dev libssl-doc libcurl4-openssl-dev

源代码如下：

#include<stdio.h>#include<stdlib.h>#include<string.h>#include<openssl/hmac.h>#include<openssl/md5.h>int output(char *p, unsigned char* pwd, int len) {int i;printf("%s", p);for (i = 0; i < len; i++) {printf("%x", pwd[i]);}printf("\n");return 0;}int main(int argc, char *argv[]) {if (argc < 2) {fprintf(stderr, "%s <original password><salt password><hash length>\n",argv[0]);return 1;}int i, hashLen;unsigned char *originalPwd;unsigned char *saltPwd;originalPwd = (unsigned char *) malloc(strlen(argv[1]) + 1); //argv[1]是初始密码saltPwd = (unsigned char *) malloc(strlen(argv[2]) + 1); //argv[2]是加盐：是指通过在密码任意固定位置插入特定的字符串，让散列后的结果和使用原始密码的散列结果不相符strcpy(originalPwd, argv[1]);strcpy(saltPwd, argv[2]);hashLen = atoi(argv[3]);//设置加密密码的长度unsigned char encryptPwd[hashLen];printf("Before add salt into the original password:\n");MD5((unsigned char *) originalPwd, strlen(originalPwd), encryptPwd);//使用MD5算法对密码进行加密（不加盐），并输出加密前后密码output("Original Password = ", (unsigned char *) originalPwd,strlen(originalPwd));output("Encrypt Password = ", (unsigned char *) encryptPwd, hashLen);printf("\nAfter add salt into the original password:\n");memset(encryptPwd, 0, sizeof(encryptPwd));strcat(originalPwd, saltPwd);MD5((unsigned char *) originalPwd, strlen(originalPwd), encryptPwd);//使用MD5算法对密码进行加密（加盐），并输出加密前后密码output("Original Password = ", (unsigned char *) originalPwd,strlen(originalPwd));output("Encrypt Password = ", (unsigned char *) encryptPwd, hashLen);return 0;}

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