evp_md.zip_digest_evp_哈希算法

/* ------------------------------------------------------------------------- * Copyright (c) 2007 JianShen. * All rights reserved. * This source code and any compilation or derivative thereof is the * proprietary information of Author(s). and is confidential in nature. * * Under no circumstances is this software to be combined with any Open * Source Software in any way or placed under an Open Source License of * any type without the express written permission of Author(s). * ------------------------------------------------------------------------- */ /* ------------------------------------------------------------------------- * Description: * 一个测试用指定的摘要计算方法计算消息摘要的例子程序。 * Author: Jian Shen * Created:2007/05/19 * Change History: * ------------------------------------------------------------------------- */ #include <stdio.h> #include <string.h> #include <openssl/evp.h> void main(int argc, char *argv[]) { EVP_MD_CTX mdctx; const EVP_MD *md; //要被计算的消息数组 char msgs[][64]={"It's just for test", "Author: Jian Shen","Hello World from openssl"}; //摘要算法名称 const char *digestName="md5";//"sha1" //const char *digestName="sha1"; unsigned char md_value[EVP_MAX_MD_SIZE]; int md_len, i; OpenSSL_add_all_digests(); //依据摘要名称获取摘要算法对象 md = EVP_get_digestbyname(digestName); if(!md) { printf("错误的摘要算法名称:%s\n", digestName); exit(1); } EVP_MD_CTX_init(&mdctx); //初始化摘要计算 EVP_DigestInit(&mdctx, md); //循环加入要计算摘要的数据 for( i=0;i<sizeof(msgs)/sizeof(msgs[0]);i++ ) { EVP_DigestUpdate(&mdctx, //摘要计算上下文 msgs[i], //要加入的信息 strlen(msgs[i]) //信息长度 ); } //结束摘要计算，并输出摘要值，md_len是摘要值的长度 EVP_DigestFinal(&mdctx, md_value, &md_len); EVP_MD_CTX_cleanup(&mdctx); printf("摘要值是: (类型=%s,长度=%d字节): ",digestName,md_len); for(i = 0; i < md_len; i++) printf("%02x", md_value[i]); printf("\n"); printf("\n click any key to continue."); //相当于暂停，观察程序运行结果 getchar(); }