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/*
* DsaKey.h - easy to use C++ classes for dealing with DSA-keys, -signatures
* etc.
*
* Copyright (c) 2006-2013 Tobias Doerffel <tobydox/at/users/dot/sf/dot/net>
*
* This file is part of iTALC - http://italc.sourceforge.net
*
* 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.
*
*/
/****************************************************************************
*
* In addition, as a special exception, Tobias Doerffel gives permission to link
* the code of its release of iTALC with the OpenSSL project's "OpenSSL" library
* (or modified versions of the "OpenSSL" library that use the same license
* as the original version), and distribute the linked executables.
*
* You must comply with the GNU General Public License version 2 in all
* respects for all of the code used other than the "OpenSSL" code. If you
* modify this file, you may extend this exception to your version of the file,
* but you are not obligated to do so. If you do not wish to do so, delete
* this exception statement from your version of this file.
*
****************************************************************************/
#ifndef DSA_KEY_H
#define DSA_KEY_H
#include <QtCore/QByteArray>
#include <QtCore/QString>
#include <openssl/dsa.h>
class DsaKey
{
public:
enum KeyType
{
Public,
Private
} ;
static const int DefaultChallengeSize;
// constructor
DsaKey( const KeyType _type ) :
m_dsa( NULL ),
m_type( _type )
{
}
// destructor
virtual ~DsaKey()
{
if( isValid() )
{
DSA_free( m_dsa );
}
}
// return key-type
inline KeyType type( void ) const
{
return m_type;
}
inline bool isValid( void ) const
{
return ( m_dsa != NULL );
}
virtual bool load( const QString & _file,
QString _passphrase = QString::null ) = 0;
virtual bool save( const QString & _file,
QString _passphrase = QString::null ) const = 0;
bool verifySignature( const QByteArray & _data,
const QByteArray & _signature ) const;
const DSA * dsaData( void ) const
{
return m_dsa;
}
static QByteArray generateChallenge( void );
protected:
DSA * m_dsa;
KeyType m_type;
} ;
class PrivateDSAKey : public DsaKey
{
public:
// constructor - load private key from file
PrivateDSAKey( const QString & _file,
const QString & _passphrase = QString::null ) :
DsaKey( Private )
{
load( _file, _passphrase );
}
// constructor - generate new private key with given number of bits
PrivateDSAKey( const unsigned int _bits );
// returns signature for data
QByteArray sign( const QByteArray & _data ) const;
virtual bool load( const QString & _file,
QString _passphrase = QString::null );
virtual bool save( const QString & _file,
QString _passphrase = QString::null ) const;
} ;
class PublicDSAKey : public DsaKey
{
public:
// constructor - load public key from file
PublicDSAKey( const QString & _file ) :
DsaKey( Public )
{
load( _file );
}
// constructor - derive public key from private key
explicit PublicDSAKey( const PrivateDSAKey & _pkey );
virtual bool load( const QString & _file,
QString _passphrase = QString::null );
virtual bool save( const QString & _file,
QString _passphrase = QString::null ) const;
} ;
#endif
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