Add CompositeKey::transformKeyBenchmark().

This method tests how many key transformation rounds can be calculated
within a specific time.

src/CMakeLists.txt

@@ -99,6 +99,7 @@ set(keepassx_MOC
     gui/GroupModel.h
     gui/GroupView.h
     gui/MainWindow.h
+    keys/CompositeKey_p.h
     streams/HashedBlockStream.h
     streams/LayeredStream.h
     streams/qtiocompressor.h

src/keys/CompositeKey.cpp

@@ -16,8 +16,10 @@
 */
 
 #include "CompositeKey.h"
+#include "CompositeKey_p.h"
 
 #include <QtCore/QtConcurrentRun>
+#include <QtCore/QTime>
 
 #include "crypto/CryptoHash.h"
 #include "crypto/SymmetricCipher.h"
@@ -103,3 +105,48 @@ void CompositeKey::addKey(const Key& key)
 {
     m_keys.append(key.clone());
 }
+
+int CompositeKey::transformKeyBenchmark(int msec)
+{
+    TransformKeyBenchmarkThread thread1(msec);
+    TransformKeyBenchmarkThread thread2(msec);
+
+    thread1.start();
+    thread2.start();
+
+    thread1.wait();
+    thread2.wait();
+
+    return qMin(thread1.rounds(), thread2.rounds());
+}
+
+
+TransformKeyBenchmarkThread::TransformKeyBenchmarkThread(int msec)
+    : m_msec(msec)
+    , m_rounds(0)
+{
+    Q_ASSERT(msec > 0);
+}
+
+int TransformKeyBenchmarkThread::rounds()
+{
+    return m_rounds;
+}
+
+void TransformKeyBenchmarkThread::run()
+{
+    QByteArray key = QByteArray('\x7E', 32);
+    QByteArray seed = QByteArray('\x4B', 32);
+    QByteArray iv(16, 0);
+
+    SymmetricCipher cipher(SymmetricCipher::Aes256, SymmetricCipher::Ecb,
+                           SymmetricCipher::Encrypt, seed, iv);
+
+    QTime t;
+    t.start();
+
+    do {
+        cipher.processInPlace(key, 100);
+        m_rounds += 100;
+    } while (t.elapsed() < m_msec);
+}

src/keys/CompositeKey.h

@@ -36,6 +36,8 @@ public:
     QByteArray transform(const QByteArray& seed, int rounds) const;
     void addKey(const Key& key);
 
+    static int transformKeyBenchmark(int msec);
+
 private:
     static QByteArray transformKeyRaw(const QByteArray& key, const QByteArray& seed,
                                       int rounds);

src/keys/CompositeKey_p.h

@@ -0,0 +1,39 @@
+/*
+*  Copyright (C) 2012 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/>.
+*/
+
+#ifndef KEEPASSX_COMPOSITEKEY_P_H
+#define KEEPASSX_COMPOSITEKEY_P_H
+
+#include <QtCore/QThread>
+
+class TransformKeyBenchmarkThread : public QThread
+{
+    Q_OBJECT
+
+public:
+    explicit TransformKeyBenchmarkThread(int msec);
+    int rounds();
+
+protected:
+    void run();
+
+private:
+    int m_msec;
+    int m_rounds;
+};
+
+#endif // KEEPASSX_COMPOSITEKEY_P_H