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/*
* blowfish.h
*
* Adapted from BeeCrypt: http://sourceforge.net/projects/beecrypt
*
* (c) 2008-2010 by Jeremy Bowman <jmbowman@alum.mit.edu>
* (c) 1999, 2000, 2002 Beeyond Software Holding BV
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/** @file blowfish.h
* Blowfish block cipher header file.
*
* For more information on this blockcipher, see:
* "Applied Cryptography", second edition,
* Bruce Schneier,
* Wiley & Sons.
*
* Also see http://www.counterpane.com/blowfish.html
*/
#ifndef _BLOWFISH_H
#define _BLOWFISH_H
#include <QByteArray>
#define BLOWFISHROUNDS 16
#define BLOWFISHPSIZE (BLOWFISHROUNDS+2)
/**
* Holds all the parameters necessary for the %Blowfish cipher.
*/
struct blowfishParam
{
quint32 p[BLOWFISHPSIZE]; /**< Holds the key expansion. */
quint32 s[1024]; /**< Holds the s-boxes. */
quint32 fdback[2]; /**< Buffer to be used by block chaining or feedback modes. */
};
/**
* Implementation of the %Blowfish block cipher using CBC mode. Derived
* from the implementation in BeeCrypt, refactored to include only the
* parts needed by %PortaBase and to take advantage of C++ code organization
* features.
*/
class Blowfish
{
public:
Blowfish();
int setup(const QByteArray &key);
QByteArray encrypt(const QByteArray &data, const QByteArray &iv);
QByteArray decrypt(const QByteArray &data, const QByteArray &iv);
public:
static size_t blockSize; /** The size of one block of data, in bytes. */
private:
int setup(blowfishParam *bp, const quint8 *key, size_t keybits);
int setIV(blowfishParam *bp, const quint8 *iv);
int encrypt(blowfishParam *bp, quint32 *dst, const quint32 *src);
int decrypt (blowfishParam *bp, quint32 *dst, const quint32 *src);
int blockEncryptCBC(quint32 *dst, const quint32 *src, unsigned int nblocks);
int blockDecryptCBC(quint32 *dst, const quint32 *src, unsigned int nblocks);
private:
blowfishParam encryptParam; /**< Encryption parameters struct */
blowfishParam decryptParam; /**< Decryption parameters struct */
};
#endif
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