Add Salsa20 cipher.

Restructure SymmetricCipher implementation to allow multiple backends.

src/crypto/SymmetricCipherSalsa20.h

@@ -0,0 +1,47 @@
+/*
+*  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/>.
+*/
+
+#ifndef KEEPASSX_SYMMETRICCIPHERSALSA20_H
+#define KEEPASSX_SYMMETRICCIPHERSALSA20_H
+
+#include "SymmetricCipherBackend.h"
+#include "salsa20/ecrypt-sync.h"
+
+class SymmetricCipherSalsa20 : public SymmetricCipherBackend
+{
+public:
+    ~SymmetricCipherSalsa20();
+    void setAlgorithm(SymmetricCipher::Algorithm algo);
+    void setMode(SymmetricCipher::Mode mode);
+    void setDirection(SymmetricCipher::Direction direction);
+    void init();
+    void setKey(const QByteArray& key);
+    void setIv(const QByteArray& iv);
+
+    QByteArray process(const QByteArray& data);
+    void processInPlace(QByteArray& data);
+
+    void reset();
+    int blockSize() const;
+
+private:
+    ECRYPT_ctx m_ctx;
+    QByteArray m_key;
+    QByteArray m_iv;
+};
+
+#endif // KEEPASSX_SYMMETRICCIPHERSALSA20_H