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/**
* KQOAuth - An OAuth authentication library for Qt.
*
* Author: Johan Paul (johan.paul@gmail.com)
* http://www.johanpaul.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* KQOAuth 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with KQOAuth. If not, see <http://www.gnu.org/licenses/>.
*/
#include <QString>
#include <QCryptographicHash>
#include <QByteArray>
#include <QtDebug>
#include "kqoauthutils.h"
QString KQOAuthUtils::hmac_sha1(const QString &message, const QString &key)
{
QByteArray keyBytes = key.toLatin1();
int keyLength; // Lenght of key word
const int blockSize = 64; // Both MD5 and SHA-1 have a block size of 64.
keyLength = keyBytes.size();
// If key is longer than block size, we need to hash the key
if (keyLength > blockSize) {
QCryptographicHash hash(QCryptographicHash::Sha1);
hash.addData(keyBytes);
keyBytes = hash.result();
}
/* http://tools.ietf.org/html/rfc2104 - (1) */
// Create the opad and ipad for the hash function.
QByteArray ipad;
QByteArray opad;
ipad.fill( 0, blockSize);
opad.fill( 0, blockSize);
ipad.replace(0, keyBytes.length(), keyBytes);
opad.replace(0, keyBytes.length(), keyBytes);
/* http://tools.ietf.org/html/rfc2104 - (2) & (5) */
for (int i=0; i<64; i++) {
ipad[i] = ipad[i] ^ 0x36;
opad[i] = opad[i] ^ 0x5c;
}
QByteArray workArray;
workArray.clear();
workArray.append(ipad, 64);
/* http://tools.ietf.org/html/rfc2104 - (3) */
workArray.append(message.toLatin1());
/* http://tools.ietf.org/html/rfc2104 - (4) */
QByteArray sha1 = QCryptographicHash::hash(workArray, QCryptographicHash::Sha1);
/* http://tools.ietf.org/html/rfc2104 - (6) */
workArray.clear();
workArray.append(opad, 64);
workArray.append(sha1);
sha1.clear();
/* http://tools.ietf.org/html/rfc2104 - (7) */
sha1 = QCryptographicHash::hash(workArray, QCryptographicHash::Sha1);
return QString(sha1.toBase64());
}
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