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/*
* Copyright (C) 2010 Felix Geyer <debfx@fobos.de>
*
* 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 or (at your option)
* version 3 of the License.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "CryptoHash.h"
#include <gcrypt.h>
#include "crypto/Crypto.h"
class CryptoHashPrivate
{
public:
gcry_md_hd_t ctx;
int hashLen;
};
CryptoHash::CryptoHash(Algorithm algo, bool hmac)
: d_ptr(new CryptoHashPrivate())
{
Q_D(CryptoHash);
Q_ASSERT(Crypto::initalized());
int algoGcrypt = -1;
unsigned int flagsGcrypt = GCRY_MD_FLAG_SECURE;
switch (algo) {
case CryptoHash::Sha256:
algoGcrypt = GCRY_MD_SHA256;
break;
case CryptoHash::Sha512:
algoGcrypt = GCRY_MD_SHA512;
break;
default:
Q_ASSERT(false);
break;
}
if (hmac) {
flagsGcrypt |= GCRY_MD_FLAG_HMAC;
}
gcry_error_t error = gcry_md_open(&d->ctx, algoGcrypt, flagsGcrypt);
if (error != GPG_ERR_NO_ERROR) {
qWarning("Gcrypt error (ctor): %s\n %s", gcry_strerror(error), gcry_strsource(error));
}
Q_ASSERT(error == 0); // TODO: error handling
d->hashLen = gcry_md_get_algo_dlen(algoGcrypt);
}
CryptoHash::~CryptoHash()
{
Q_D(CryptoHash);
gcry_md_close(d->ctx);
delete d_ptr;
}
void CryptoHash::addData(const QByteArray& data)
{
Q_D(CryptoHash);
if (data.isEmpty()) {
return;
}
gcry_md_write(d->ctx, data.constData(), static_cast<size_t>(data.size()));
}
void CryptoHash::setKey(const QByteArray& data)
{
Q_D(CryptoHash);
gcry_error_t error = gcry_md_setkey(d->ctx, data.constData(), static_cast<size_t>(data.size()));
if (error) {
qWarning("Gcrypt error (setKey): %s\n %s", gcry_strerror(error), gcry_strsource(error));
}
Q_ASSERT(error == 0);
}
QByteArray CryptoHash::result() const
{
Q_D(const CryptoHash);
const auto result = reinterpret_cast<const char*>(gcry_md_read(d->ctx, 0));
return QByteArray(result, d->hashLen);
}
QByteArray CryptoHash::hash(const QByteArray& data, Algorithm algo)
{
// replace with gcry_md_hash_buffer()?
CryptoHash cryptoHash(algo);
cryptoHash.addData(data);
return cryptoHash.result();
}
QByteArray CryptoHash::hmac(const QByteArray& data, const QByteArray& key, Algorithm algo)
{
// replace with gcry_md_hash_buffer()?
CryptoHash cryptoHash(algo, true);
cryptoHash.setKey(key);
cryptoHash.addData(data);
return cryptoHash.result();
}
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