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#ifndef _KVI_CRYPT_ENGINE_H_
#define _KVI_CRYPT_ENGINE_H_
//=============================================================================
//
// File : KviCryptEngine.h
// Creation date : Fri Nov 03 2000 01:45:21 CEST by Szymon Stefanek
//
// This file is part of the KVIrc IRC client distribution
// Copyright (C) 2000-2010 Szymon Stefanek (pragma at kvirc dot 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. If not, write to the Free Software Foundation,
// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
//=============================================================================
#include "kvi_settings.h"
//
// Base class for all IRC crypt engines
// These intend to encrypt plain text into something
// that can be sent through the IRC protocol...
// so it should not contain NULL, CR, LF and other
// similar stuff...
//
#include "KviHeapObject.h"
#include <QObject>
class KviCString;
#ifdef COMPILE_CRYPT_SUPPORT
class KviCryptEngine;
typedef KviCryptEngine * (*crypt_engine_allocator_func)();
typedef void (*crypt_engine_deallocator_func)(KviCryptEngine *);
#endif //COMPILE_CRYPT_SUPPORT
// we must include this declaration to make moc happy even
// if we're not compiling the crypt support
class KVILIB_API KviCryptEngine : public QObject, public KviHeapObject
{
Q_OBJECT
friend class KviCryptEngineManager;
public:
enum EngineFlag
{
CanEncrypt = 1,
CanDecrypt = 2,
WantEncryptKey = 4,
WantDecryptKey = 8
};
enum EncryptResult
{
Encrypted,
Encoded,
EncryptError
};
enum DecryptResult
{
DecryptOkWasEncrypted,
DecryptOkWasEncoded,
DecryptOkWasPlainText,
DecryptError
};
KviCryptEngine();
~KviCryptEngine();
#ifdef COMPILE_CRYPT_SUPPORT
private:
crypt_engine_deallocator_func m_deallocFunc; // this is accessed by KviCryptEngineManager only
QString m_szLastError;
int m_iMaxEncryptLen;
public:
void setMaxEncryptLen(int m) { m_iMaxEncryptLen = m; }
int maxEncryptLen() const { return m_iMaxEncryptLen; }
virtual bool init(const char * encKey, int encKeyLen, const char * decKey, int decKeyLen);
//
// Encrypts utf8 plainText and returns the encrypted
// data in outBuffer. The encrypted data must be
// suitable for sending through an IRC (eventually DCC
// that is less restrictive) connection and must be utf8 encoded: so
// no NULL, CR and LF in the output.
// 0x01 should be also avoided since
// it is the CTCP delimiter.
// Converting the result in a HEX string
// is a good trick...also Base64 could be used.
// Should return false in case of an error.
// Theoretically we could allow NULLs in plainText
// but this is not the case of KVIrc.
//
virtual EncryptResult encrypt(const char * plainText, KviCString & outBuffer);
//
// Decrypts the utf8 data in inBuffer and puts the decrypted utf8
// stuff in plainText. inBuffer is the thingie
// that we got from outBuffer of encrupt() so it
// follows the same rules.
// Should return false in case of error.
//
virtual DecryptResult decrypt(const char * inBuffer, KviCString & plainText);
//
// Returns the string containing the description
// of the last error or an empty string if there
// was no error after the last init() call.
//
const QString & lastError() const { return m_szLastError; }
protected:
//
// The following two should have clear meaning
//
void clearLastError() { setLastError(""); }
void setLastError(const QString & err) { m_szLastError = err; }
#endif //COMPILE_CRYPT_SUPPORT
};
#endif // _KVI_CRYPT_ENGINE_H_
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