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/*
* This file is part of PowerDNS or weakforced.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 3 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <string>
#include "hmac.hh"
#include "wforce_exception.hh"
static const EVP_MD* getMDType(HashAlgo algo)
{
switch(algo) {
case HashAlgo::SHA224:
return EVP_sha224();
break;
case HashAlgo::SHA256:
return EVP_sha256();
break;
case HashAlgo::SHA384:
return EVP_sha384();
break;
case HashAlgo::SHA512:
return EVP_sha512();
break;
default:
throw WforceException("Unknown hash algorithm requested from calculateHMAC()");
}
}
// This function is borrowed and modified from pdns src
std::string calculateHMAC(const std::string& key, const std::string& text, HashAlgo algo)
{
const EVP_MD* md_type;
unsigned int outlen;
unsigned char hash[EVP_MAX_MD_SIZE];
md_type = getMDType(algo);
unsigned char* out = HMAC(md_type,
reinterpret_cast<const unsigned char*>(key.c_str()), key.size(),
reinterpret_cast<const unsigned char*>(text.c_str()), text.size(),
hash, &outlen);
if (out != NULL && outlen > 0) {
return std::string((char*) hash, outlen);
}
return "";
}
std::string calculateHash(const std::string& text, HashAlgo algo)
{
EVP_MD_CTX *mdctx;
const EVP_MD *md_type;
unsigned char hash[EVP_MAX_MD_SIZE];
unsigned int out_len;
md_type = getMDType(algo);
mdctx = EVP_MD_CTX_create();
EVP_DigestInit_ex(mdctx, md_type, NULL);
EVP_DigestUpdate(mdctx, reinterpret_cast<const unsigned char*>(text.c_str()), text.size());
int ret = EVP_DigestFinal_ex(mdctx, hash, &out_len);
EVP_MD_CTX_destroy(mdctx);
if ((ret == 1) && (out_len > 0)) {
return std::string((char*) hash, out_len);
}
return "";
}
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