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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 "SymmetricCipherSalsa20.h"
SymmetricCipherSalsa20::SymmetricCipherSalsa20(SymmetricCipher::Algorithm algo, SymmetricCipher::Mode mode,
SymmetricCipher::Direction direction)
{
Q_ASSERT(algo == SymmetricCipher::Salsa20);
Q_UNUSED(algo);
Q_ASSERT(mode == SymmetricCipher::Stream);
Q_UNUSED(mode);
Q_UNUSED(direction);
}
SymmetricCipherSalsa20::~SymmetricCipherSalsa20()
{
}
void SymmetricCipherSalsa20::init()
{
}
void SymmetricCipherSalsa20::setKey(const QByteArray& key)
{
Q_ASSERT((key.size() == 16) || (key.size() == 32));
m_key = key;
ECRYPT_keysetup(&m_ctx, reinterpret_cast<const u8*>(m_key.constData()), m_key.size()*8, 64);
}
void SymmetricCipherSalsa20::setIv(const QByteArray& iv)
{
Q_ASSERT(iv.size() == 8);
m_iv = iv;
ECRYPT_ivsetup(&m_ctx, reinterpret_cast<const u8*>(m_iv.constData()));
}
QByteArray SymmetricCipherSalsa20::process(const QByteArray& data)
{
Q_ASSERT((data.size() < blockSize()) || ((data.size() % blockSize()) == 0));
QByteArray result;
result.resize(data.size());
ECRYPT_encrypt_bytes(&m_ctx, reinterpret_cast<const u8*>(data.constData()),
reinterpret_cast<u8*>(result.data()), data.size());
return result;
}
void SymmetricCipherSalsa20::processInPlace(QByteArray& data)
{
Q_ASSERT((data.size() < blockSize()) || ((data.size() % blockSize()) == 0));
ECRYPT_encrypt_bytes(&m_ctx, reinterpret_cast<const u8*>(data.constData()),
reinterpret_cast<u8*>(data.data()), data.size());
}
void SymmetricCipherSalsa20::processInPlace(QByteArray& data, int rounds)
{
Q_ASSERT((data.size() < blockSize()) || ((data.size() % blockSize()) == 0));
for (int i = 0; i != rounds; ++i) {
ECRYPT_encrypt_bytes(&m_ctx, reinterpret_cast<const u8*>(data.constData()),
reinterpret_cast<u8*>(data.data()), data.size());
}
}
void SymmetricCipherSalsa20::reset()
{
ECRYPT_ivsetup(&m_ctx, reinterpret_cast<const u8*>(m_iv.constData()));
}
int SymmetricCipherSalsa20::blockSize() const
{
return 64;
}
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