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/***************************************************************************
* *
* copyright (C) 2003, 2004 by Michael Buesch *
* email: mbuesch@freenet.de *
* *
* blowfish.c - Blowfish encryption *
* Copyright (C) 1998, 2001, 2002 Free Software Foundation, Inc. *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License version 2 *
* as published by the Free Software Foundation. *
* *
***************************************************************************/
/***************************************************************************
* copyright (C) 2004 by Ulf Schenk
* This file is originaly based on version 1.0.1 of pwmanager
* and was modified to run on embedded devices that run microkde
*
* $Id$
**************************************************************************/
#ifndef BLOWFISH_H
#define BLOWFISH_H
//#include "pwmexception.h"
#ifndef _WIN32_
#include <stdint.h>
#else
#endif
#include <string>
using std::string;
#define BLOWFISH_BLOCKSIZE 8
#define BLOWFISH_ROUNDS 16
#define CIPHER_ALGO_BLOWFISH 4 /* blowfish 128 bit key */
#ifndef _WIN32_
typedef uint8_t byte;
#else
#define uint8_t Q_UINT8
#define byte Q_UINT8
#define uint32_t Q_UINT32
#endif
//#include "pwmexception.h"
/** blowfish encryption algorithm.
* Derived from libgcrypt-1.1.12
*/
class Blowfish
{
struct BLOWFISH_context
{
uint32_t s0[256];
uint32_t s1[256];
uint32_t s2[256];
uint32_t s3[256];
uint32_t p[BLOWFISH_ROUNDS+2];
};
public:
Blowfish() {}
static bool selfTest();
/** set key to encrypt. if return == 1, it is a weak key. */
int bf_setkey( byte *key, unsigned int keylen );
/** encrypt inbuf and return it in outbuf.
* inbuf and outbuf have to be: buf % 8 == 0
* You may check this with getPaddedLen() and pad with NULL.
*/
int bf_encrypt( byte *outbuf, byte *inbuf, unsigned int inbuf_len );
/** decrypt inbuf and return it in outbuf.
* inbuf and outbuf have to be: buf % 8 == 0
* You may check this with getPaddedLen() and pad with NULL.
*/
int bf_decrypt( byte *outbuf, byte *inbuf, unsigned int inbuf_len );
/** returns the length, the sting has to be padded to */
static unsigned int getPaddedLen(unsigned int inLen)
{ return ((8 - (inLen % 8)) + inLen); }
/** pad up to 8 bytes. */
static void padNull(string *buf);
/** remove padded data */
static bool unpadNull(string *buf);
protected:
#if BLOWFISH_ROUNDS != 16
uint32_t function_F( uint32_t x)
{
uint16_t a, b, c, d;
#ifdef BIG_ENDIAN_HOST
a = ((byte *) & x)[0];
b = ((byte *) & x)[1];
c = ((byte *) & x)[2];
d = ((byte *) & x)[3];
#else
a = ((byte *) & x)[3];
b = ((byte *) & x)[2];
c = ((byte *) & x)[1];
d = ((byte *) & x)[0];
#endif
return ((bc.s0[a] + bc.s1[b]) ^ bc.s2[c]) + bc.s3[d];
}
#endif
void R(uint32_t &l, uint32_t &r, uint32_t i, uint32_t *p,
uint32_t *s0, uint32_t *s1, uint32_t *s2, uint32_t *s3)
{
l ^= p[i];
#ifdef BIG_ENDIAN_HOST
r ^= (( s0[((byte*)&l)[0]] + s1[((byte*)&l)[1]])
^ s2[((byte*)&l)[2]]) + s3[((byte*)&l)[3]];
#else
r ^= (( s0[((byte*)&l)[3]] + s1[((byte*)&l)[2]])
^ s2[((byte*)&l)[1]]) + s3[((byte*)&l)[0]];
#endif
}
void encrypt_block(byte *outbuf, byte *inbuf);
void decrypt_block(byte *outbuf, byte *inbuf);
void burn_stack(int bytes);
void do_encrypt(uint32_t *ret_xl, uint32_t *ret_xr);
void do_decrypt(uint32_t *ret_xl, uint32_t *ret_xr);
void do_encrypt_block(byte *outbuf, byte *inbuf);
void do_decrypt_block(byte *outbuf, byte *inbuf);
int do_bf_setkey(byte *key, unsigned int keylen);
protected:
struct BLOWFISH_context bc;
};
#endif
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