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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#include "messageDigest.h"
#include "util.h"
#include "array_fun.h"
namespace aria2 {
const std::string MessageDigestContext::SHA1("sha-1");
const std::string MessageDigestContext::SHA256("sha-256");
const std::string MessageDigestContext::MD5("md-5");
namespace {
struct DigestAlgoEntry {
MessageDigestContext::DigestAlgo algo;
int strength;
DigestAlgoEntry(const MessageDigestContext::DigestAlgo& algo, int strength):
algo(algo), strength(strength) {}
};
}
typedef std::map<std::string, DigestAlgoEntry>
DigestAlgoMap;
static const DigestAlgoMap& getDigestAlgos()
{
enum AlgoStrength {
STRENGTH_MD5 = 0,
STRENGTH_SHA_1 = 1,
STRENGTH_SHA_256 = 2
};
static const DigestAlgoMap::value_type digests[] = {
#ifdef HAVE_LIBSSL
DigestAlgoMap::value_type("md5", DigestAlgoEntry(EVP_md5(), STRENGTH_MD5)),
DigestAlgoMap::value_type
("sha-1", DigestAlgoEntry(EVP_sha1(), STRENGTH_SHA_1)),
DigestAlgoMap::value_type
("sha1", DigestAlgoEntry(EVP_sha1(), STRENGTH_SHA_1)),
# ifdef HAVE_EVP_SHA256
DigestAlgoMap::value_type
("sha-256", DigestAlgoEntry(EVP_sha256(), STRENGTH_SHA_256)),
DigestAlgoMap::value_type
("sha256", DigestAlgoEntry(EVP_sha256(), STRENGTH_SHA_256)),
# endif // HAVE_EVP_SHA256
#elif HAVE_LIBGCRYPT
DigestAlgoMap::value_type
("md5", DigestAlgoEntry(GCRY_MD_MD5, STRENGTH_MD5)),
DigestAlgoMap::value_type
("sha-1", DigestAlgoEntry(GCRY_MD_SHA1, STRENGTH_SHA_1)),
DigestAlgoMap::value_type
("sha1", DigestAlgoEntry(GCRY_MD_SHA1, STRENGTH_SHA_1)),
DigestAlgoMap::value_type
("sha-256", DigestAlgoEntry(GCRY_MD_SHA256, STRENGTH_SHA_256)),
DigestAlgoMap::value_type
("sha256", DigestAlgoEntry(GCRY_MD_SHA256, STRENGTH_SHA_256)),
#endif // HAVE_LIBGCRYPT
};
static const DigestAlgoMap algomap(vbegin(digests), vend(digests));
return algomap;
}
std::string MessageDigestContext::digestFinal()
{
size_t length = digestLength(algo);
unsigned char* rawMD = new unsigned char[length];
digestFinal(rawMD);
std::string rawMDString(&rawMD[0], &rawMD[length]);
delete [] rawMD;
return rawMDString;
}
bool MessageDigestContext::supports(const std::string& algostring)
{
const DigestAlgoMap& allAlgos = getDigestAlgos();
DigestAlgoMap::const_iterator itr = allAlgos.find(algostring);
if(itr == allAlgos.end()) {
return false;
} else {
return true;
}
}
MessageDigestContext::DigestAlgo
MessageDigestContext::getDigestAlgo(const std::string& algostring)
{
const DigestAlgoMap& allAlgos = getDigestAlgos();
DigestAlgoMap::const_iterator itr = allAlgos.find(algostring);
if(itr == allAlgos.end()) {
throw DL_ABORT_EX
(StringFormat("Digest algorithm %s is not supported.",
algostring.c_str()).str());
}
return (*itr).second.algo;
}
std::string MessageDigestContext::getSupportedAlgoString()
{
const DigestAlgoMap& allAlgos = getDigestAlgos();
std::string algos;
for(DigestAlgoMap::const_iterator itr = allAlgos.begin(),
eoi = allAlgos.end(); itr != eoi; ++itr) {
algos += (*itr).first;
algos += ", ";
}
return util::trim(algos, ", ");
}
bool MessageDigestContext::isStronger
(const std::string& lhs, const std::string& rhs)
{
const DigestAlgoMap& allAlgos = getDigestAlgos();
DigestAlgoMap::const_iterator lhsitr = allAlgos.find(lhs);
DigestAlgoMap::const_iterator rhsitr = allAlgos.find(rhs);
if(lhsitr == allAlgos.end() || rhsitr == allAlgos.end()) {
return false;
}
return (*lhsitr).second.strength > (*rhsitr).second.strength;
}
} // namespace aria2
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