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/*
* Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
*
* 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 "KeePass2.h"
#include "crypto/CryptoHash.h"
#include "crypto/kdf/AesKdf.h"
#include "crypto/kdf/Argon2Kdf.h"
#include <QSharedPointer>
#define UUID_LENGTH 16
const QUuid KeePass2::CIPHER_AES128 = QUuid("61ab05a1-9464-41c3-8d74-3a563df8dd35");
const QUuid KeePass2::CIPHER_AES256 = QUuid("31c1f2e6-bf71-4350-be58-05216afc5aff");
const QUuid KeePass2::CIPHER_TWOFISH = QUuid("ad68f29f-576f-4bb9-a36a-d47af965346c");
const QUuid KeePass2::CIPHER_CHACHA20 = QUuid("d6038a2b-8b6f-4cb5-a524-339a31dbb59a");
const QUuid KeePass2::KDF_AES_KDBX3 = QUuid("c9d9f39a-628a-4460-bf74-0d08c18a4fea");
const QUuid KeePass2::KDF_AES_KDBX4 = QUuid("7c02bb82-79a7-4ac0-927d-114a00648238");
const QUuid KeePass2::KDF_ARGON2 = QUuid("ef636ddf-8c29-444b-91f7-a9a403e30a0c");
const QByteArray KeePass2::INNER_STREAM_SALSA20_IV("\xe8\x30\x09\x4b\x97\x20\x5d\x2a");
const QString KeePass2::KDFPARAM_UUID("$UUID");
// AES parameters
const QString KeePass2::KDFPARAM_AES_ROUNDS("R");
const QString KeePass2::KDFPARAM_AES_SEED("S");
// Argon2 parameters
const QString KeePass2::KDFPARAM_ARGON2_SALT("S");
const QString KeePass2::KDFPARAM_ARGON2_PARALLELISM("P");
const QString KeePass2::KDFPARAM_ARGON2_MEMORY("M");
const QString KeePass2::KDFPARAM_ARGON2_ITERATIONS("I");
const QString KeePass2::KDFPARAM_ARGON2_VERSION("V");
const QString KeePass2::KDFPARAM_ARGON2_SECRET("K");
const QString KeePass2::KDFPARAM_ARGON2_ASSOCDATA("A");
const QList<QPair<QUuid, QString>> KeePass2::CIPHERS{
qMakePair(KeePass2::CIPHER_AES256, QObject::tr("AES: 256-bit")),
qMakePair(KeePass2::CIPHER_TWOFISH, QObject::tr("Twofish: 256-bit")),
qMakePair(KeePass2::CIPHER_CHACHA20, QObject::tr("ChaCha20: 256-bit"))};
const QList<QPair<QUuid, QString>> KeePass2::KDFS{
qMakePair(KeePass2::KDF_ARGON2, QObject::tr("Argon2 (KDBX 4 – recommended)")),
qMakePair(KeePass2::KDF_AES_KDBX4, QObject::tr("AES-KDF (KDBX 4)")),
qMakePair(KeePass2::KDF_AES_KDBX3, QObject::tr("AES-KDF (KDBX 3.1)"))};
QByteArray KeePass2::hmacKey(const QByteArray& masterSeed, const QByteArray& transformedMasterKey)
{
CryptoHash hmacKeyHash(CryptoHash::Sha512);
hmacKeyHash.addData(masterSeed);
hmacKeyHash.addData(transformedMasterKey);
hmacKeyHash.addData(QByteArray(1, '\x01'));
return hmacKeyHash.result();
}
/**
* Create KDF object from KDBX4+ KDF parameters.
*
* @param p variant map containing parameters
* @return initialized KDF
*/
QSharedPointer<Kdf> KeePass2::kdfFromParameters(const QVariantMap& p)
{
QByteArray uuidBytes = p.value(KDFPARAM_UUID).toByteArray();
if (uuidBytes.size() != UUID_LENGTH) {
return {};
}
QUuid kdfUuid = QUuid::fromRfc4122(uuidBytes);
if (kdfUuid == KDF_AES_KDBX3) {
// upgrade to non-legacy AES-KDF, since KDBX3 doesn't have any KDF parameters
kdfUuid = KDF_AES_KDBX4;
}
QSharedPointer<Kdf> kdf = uuidToKdf(kdfUuid);
if (kdf.isNull()) {
return {};
}
if (!kdf->processParameters(p)) {
return {};
}
return kdf;
}
QVariantMap KeePass2::kdfToParameters(const QSharedPointer<Kdf>& kdf)
{
return kdf->writeParameters();
}
QSharedPointer<Kdf> KeePass2::uuidToKdf(const QUuid& uuid)
{
if (uuid == KDF_AES_KDBX3) {
return QSharedPointer<AesKdf>::create(true);
}
if (uuid == KDF_AES_KDBX4) {
return QSharedPointer<AesKdf>::create();
}
if (uuid == KDF_ARGON2) {
return QSharedPointer<Argon2Kdf>::create();
}
return {};
}
KeePass2::ProtectedStreamAlgo KeePass2::idToProtectedStreamAlgo(quint32 id)
{
switch (id) {
case static_cast<quint32>(KeePass2::ProtectedStreamAlgo::ArcFourVariant):
return KeePass2::ProtectedStreamAlgo::ArcFourVariant;
case static_cast<quint32>(KeePass2::ProtectedStreamAlgo::Salsa20):
return KeePass2::ProtectedStreamAlgo::Salsa20;
case static_cast<quint32>(KeePass2::ProtectedStreamAlgo::ChaCha20):
return KeePass2::ProtectedStreamAlgo::ChaCha20;
default:
return KeePass2::ProtectedStreamAlgo::InvalidProtectedStreamAlgo;
}
}
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