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/*
* CryptoCore.cpp - core functions for crypto features
*
* Copyright (c) 2017-2019 Tobias Junghans <tobydox@veyon.io>
*
* This file is part of Veyon - http://veyon.io
*
* 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 of the License, or (at your option) any later version.
*
* 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 (see COPYING); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
#include <openssl/bn.h>
#include "CryptoCore.h"
CryptoCore::CryptoCore() :
m_qcaInitializer(),
m_defaultPrivateKey()
{
const auto features = QCA::supportedFeatures();
qDebug() << "CryptoCore instance created - features supported by QCA" << qcaVersionStr() << features;
if( features.contains( QStringLiteral( "rsa" ) ) == false )
{
qFatal( "CryptoCore: RSA not supported! Please install a QCA plugin which provides RSA support "
"(e.g. packages such as libqca-qt5-2-plugins or qca-qt5-ossl)." );
}
m_defaultPrivateKey = PrivateKey::fromPEMFile( QStringLiteral(":/resources/default-pkey.pem") );
}
CryptoCore::~CryptoCore()
{
qDebug( "CryptoCore instance destroyed" );
}
QByteArray CryptoCore::generateChallenge()
{
BIGNUM * challengeBigNum = BN_new();
if( challengeBigNum == nullptr )
{
qCritical( "CryptoCore::generateChallenge(): BN_new() failed" );
return QByteArray();
}
// generate a random challenge
BN_rand( challengeBigNum, ChallengeSize * 8, 0, 0 );
QByteArray chall( BN_num_bytes( challengeBigNum ), 0 );
BN_bn2bin( challengeBigNum, reinterpret_cast<unsigned char *>( chall.data() ) );
BN_free( challengeBigNum );
return chall;
}
QString CryptoCore::encryptPassword( const QString& password ) const
{
return m_defaultPrivateKey.toPublicKey().encrypt( password.toUtf8(), DefaultEncryptionAlgorithm ).toByteArray().toHex();
}
QString CryptoCore::decryptPassword( const QString& encryptedPassword ) const
{
SecureArray decryptedPassword;
if( PrivateKey( m_defaultPrivateKey ).decrypt( QByteArray::fromHex( encryptedPassword.toUtf8() ),
&decryptedPassword, DefaultEncryptionAlgorithm ) )
{
return decryptedPassword.toByteArray();
}
qCritical("CryptoCore: failed to decrypt password!" );
return QString();
}
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