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

openssl的庫的用法， 前面已經介紹了， 所以不再啰嗦， 直接給出代碼：

[cpp]?view plaincopy

//?openssl的庫的用法，?前面已經介紹了，?所以不再啰嗦，?直接給出代碼??

??

#include?<iostream>??

#include?<openssl/evp.h>??

#pragma?comment(lib,?"libeay32.lib")??

#pragma?comment(lib,?"ssleay32.lib")?//?可以注釋掉??

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;??

}??

? ? ? 結果為：

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

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