/*
 *  Copyright (C) 2026 KeePassXC Team <team@keepassxc.org>
 *  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 "TestKeePass2RandomStream.h"

#include "crypto/Crypto.h"
#include "crypto/CryptoHash.h"
#include "crypto/SymmetricCipher.h"
#include "format/KeePass2.h"
#include "format/KeePass2RandomStream.h"

#include <QTest>

QTEST_GUILESS_MAIN(TestKeePass2RandomStream)

void TestKeePass2RandomStream::initTestCase()
{
    QVERIFY(Crypto::init());
    QLocale::setDefault(QLocale::c());
}

void TestKeePass2RandomStream::test()
{
    const QByteArray key("\x11\x22\x33\x44\x55\x66\x77\x88");
    const int Size = 128;

    SymmetricCipher cipher;
    QVERIFY(cipher.init(SymmetricCipher::Salsa20,
                        SymmetricCipher::Encrypt,
                        CryptoHash::hash(key, CryptoHash::Sha256),
                        KeePass2::INNER_STREAM_SALSA20_IV));

    const QByteArray data(QByteArray::fromHex("601ec313775789a5b7a7f504bbf3d228f443e3ca4d62b59aca84e990cacaf5c5"
                                              "2b0930daa23de94ce87017ba2d84988ddfc9c58db67aada613c2dd08457941a6"
                                              "1abc932417521ca24f2b0459fe7e6e0b090339ec0aa6faefd5ccc2c6f4ce8e94"
                                              "1e36b26bd1ebc670d1bd1d665620abf74f78a7f6d29809585a97daec58c6b050"));

    QByteArray cipherPad;
    cipherPad.fill('\0', Size);
    QVERIFY(cipher.process(cipherPad));

    QByteArray cipherData;
    cipherData.resize(Size);

    for (int i = 0; i < Size; i++) {
        cipherData[i] = data[i] ^ cipherPad[i];
    }

    KeePass2RandomStream randomStream;
    bool ok;
    QVERIFY(randomStream.init(SymmetricCipher::Salsa20, key));
    QByteArray randomStreamData;
    randomStreamData.append(randomStream.process(data.mid(0, 7), &ok));
    QVERIFY(ok);
    randomStreamData.append(randomStream.process(data.mid(7, 1), &ok));
    QVERIFY(ok);
    QByteArray tmpData = data.mid(8, 12);
    QVERIFY(randomStream.processInPlace(tmpData));
    randomStreamData.append(tmpData);
    randomStreamData.append(randomStream.process(data.mid(20, 44), &ok));
    QVERIFY(ok);
    randomStreamData.append(randomStream.process(data.mid(64, 64), &ok));
    QVERIFY(ok);

    SymmetricCipher cipherEncrypt;
    QVERIFY(cipherEncrypt.init(SymmetricCipher::Salsa20,
                               SymmetricCipher::Encrypt,
                               CryptoHash::hash(key, CryptoHash::Sha256),
                               KeePass2::INNER_STREAM_SALSA20_IV));
    QByteArray cipherDataEncrypt = data;
    QVERIFY(cipherEncrypt.process(cipherDataEncrypt));

    QCOMPARE(randomStreamData.size(), Size);
    QCOMPARE(cipherData, cipherDataEncrypt);
    QCOMPARE(randomStreamData, cipherData);
}
