mirror of
https://github.com/keepassxreboot/keepassxc.git
synced 2024-10-01 01:26:01 -04:00
80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
/*
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* Copyright (C) 2010 Felix Geyer <debfx@fobos.de>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 or (at your option)
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* version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "KeePass2RandomStream.h"
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#include "crypto/CryptoHash.h"
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#include "format/KeePass2.h"
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KeePass2RandomStream::KeePass2RandomStream(const QByteArray& key)
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: m_cipher(SymmetricCipher::Salsa20, SymmetricCipher::Stream, SymmetricCipher::Encrypt,
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CryptoHash::hash(key, CryptoHash::Sha256), KeePass2::INNER_STREAM_SALSA20_IV)
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, m_offset(0)
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{
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}
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QByteArray KeePass2RandomStream::randomBytes(int size)
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{
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QByteArray result;
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int bytesRemaining = size;
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while (bytesRemaining > 0) {
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if (m_buffer.size() == m_offset) {
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loadBlock();
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}
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int bytesToCopy = qMin(bytesRemaining, m_buffer.size() - m_offset);
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result.append(m_buffer.mid(m_offset, bytesToCopy));
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m_offset += bytesToCopy;
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bytesRemaining -= bytesToCopy;
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}
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return result;
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}
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QByteArray KeePass2RandomStream::process(const QByteArray& data)
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{
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QByteArray randomData = randomBytes(data.size());
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QByteArray result;
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result.resize(data.size());
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for (int i = 0; i < data.size(); i++) {
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result[i] = data[i] ^ randomData[i];
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}
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return result;
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}
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void KeePass2RandomStream::processInPlace(QByteArray& data)
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{
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QByteArray randomData = randomBytes(data.size());
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for (int i = 0; i < data.size(); i++) {
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data[i] = data[i] ^ randomData[i];
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}
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}
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void KeePass2RandomStream::loadBlock()
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{
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Q_ASSERT(m_offset == m_buffer.size());
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m_buffer.fill('\0', m_cipher.blockSize());
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m_cipher.processInPlace(m_buffer);
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m_offset = 0;
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}
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