如何利用openssl来计算md4, md5, sha1, sha256, sha384, sha512等常用哈希值?

转载：http://blog.csdn.net/stpeace/article/details/41922115

openssl的库的用法， 前面已经介绍了， 所以不再啰嗦， 直接给出代码：

 // openssl的库的用法， 前面已经介绍了， 所以不再啰嗦， 直接给出代码

 #include
 #include
 #pragma comment(lib, "libeay32.lib")
 #pragma comment(lib, "ssleay32.lib") // 可以注释掉
 using namespace std;


 int main()
 {
     char digestType[][20] =
     {
         "xxx", // 非法
         "md4",
         "md5",
         "sha1",
         "sha256",
         "sha384",
         "sha512",
     };

     int size = sizeof(digestType) / sizeof(digestType[0]);
     int i = 0;
     for(i = 0; i < size; i++)
     {
         EVP_MD_CTX mdctx;
         const EVP_MD *md = NULL;
         char str[] = "testOpenssl";
         unsigned char mdValue[EVP_MAX_MD_SIZE] = {0};
         unsigned int mdLen = 0;

         OpenSSL_add_all_digests();
         md = EVP_get_digestbyname(digestType[i]);
         if(!md) // 不支持的格式
         {
             printf("Unknown message digest %s\n", digestType[i]);
             continue;
         }

         EVP_MD_CTX_init(&mdctx);
         EVP_DigestInit_ex(&mdctx, md, NULL);
         EVP_DigestUpdate(&mdctx, str, strlen(str));
         EVP_DigestFinal_ex(&mdctx, mdValue, &mdLen);
         EVP_MD_CTX_cleanup(&mdctx);

         printf("%s is ",  digestType[i]);
         int j = 0;
         for(j = 0; j < mdLen; j++)
         {
             printf("%02X", mdValue[j]);
         }

         printf("\n");
     }

     return 0;
 }

      结果为：

Unknown message digest xxx
md4 is 3F1DED43A61E531EB49771D7519741A6
md5 is BD9A9CAE3D300EC608C217658E20F934
sha1 is 842CC44DB178A7A73BDB2BCDB7386BCABD56A5CB
sha256 is DB22DB9C451E72D85ED9348A736A69A66451593598C2CABACC949C6E33D844DF
sha384 is 707F730102F9C512C53348BE2C0A80D5B5CB8C67CC7A4A4602E99710CD37466BC3ED4F076BA9B77428D1C2EC35A7F261
sha512 is DAE45250C34FCF0860D02F692B9FC79FEA7E6D82C342EB7C402C71959D1B8CABCFFBC61142FFA21344130E809F0AE87AA002C24DB3F1542BA8331A6E82743C7F