Use the Blowfish encryption algorithm instead of IDEA. This is partly

[become] / src / blowfish.h

/* -*-c-*-
 *
 * $Id: blowfish.h,v 1.3.2.1 1997/09/26 09:07:59 mdw Exp $
 *
 * Blowfish encryption routines
 *
 * (c) 1997 Mark Wooding
 */
 
/*----- Licensing notice --------------------------------------------------*
 *
 * This file is part of `become'
 *
 * `Become' 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.
 *
 * `Become' 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 `become'; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*----- Revision history --------------------------------------------------*
 *
 * $Log: blowfish.h,v $
 * Revision 1.3.2.1  1997/09/26 09:07:59  mdw
 * Use the Blowfish encryption algorithm instead of IDEA.  This is partly
 * because I prefer Blowfish (without any particularly strong evidence) but
 * mainly because IDEA is patented and Blowfish isn't.
 *
 * Revision 1.3  1997/08/07 09:43:20  mdw
 * Fix address of the FSF.
 *
 * Revision 1.2  1997/08/04 10:24:20  mdw
 * Sources placed under CVS control.
 *
 * Revision 1.1  1997/07/21  13:47:53  mdw
 * Initial revision
 *
 */

#ifndef BLOWFISH_H
#define BLOWFISH_H

#ifdef __cplusplus
  extern "C" {
#endif

/*----- Required headers --------------------------------------------------*/

#ifndef CONFIG_H
#  include "config.h"
#endif

/*----- Type definitions --------------------------------------------------*/

/* --- A blowfish expanded key --- */

typedef struct blowfish_key {
  uint_32 p[18];
  uint_32 s0[256];
  uint_32 s1[256];
  uint_32 s2[256];
  uint_32 s3[256];
} blowfish_key;

/* --- Size of a blowfish block --- */

#define BLOWFISH_BLKSIZE (8u)

/*----- Functions provided ------------------------------------------------*/

/* --- @blowfish_encrypt@ --- *
 *
 * Arguments:	@const blowfish_key *k@ = pointer to key block
 *		@const voic *from@ = block to encrypt from
 *		@void *to@ = block to encrypt to
 *
 * Returns:	---
 *
 * Use:		Encrypts a block using the Blowfish algorithm.
 */

extern void blowfish_encrypt(const blowfish_key */*k*/,
			     const void */*from*/, void */*to*/);


/* --- @blowfish_decrypt@ --- *
 *
 * Arguments:	@const blowfish_key *k@ = pointer to key block
 *		@const void *from@ = block to decrypt from
 *		@void *to@ = block to decrypt to
 *
 * Returns:	---
 *
 * Use:		Decrypts a block using the Blowfish algorithm.
 */

extern void blowfish_decrypt(const blowfish_key */*k*/,
			     const void */*from*/, void */*to*/);

/* --- @blowfish_setKey@ --- *
 *
 * Arguments:	@blowfish_key *kb@ = pointer to key block to fill
 *		@void *k@ = pointer to key data
 *		@size_t sz@ = length of data in bytes
 *
 * Returns:	---
 *
 * Use:		Expands a key which isn't represented as a number of whole
 *		words.  This is a nonstandard extension, although it can be
 *		used to support 40-bit keys, which some governments might
 *		find more palatable than 160-bit (or 448-bit!) keys.
 */

extern void blowfish_setKey(blowfish_key */*kb*/,
			    const void */*k*/, size_t /*sz*/);

/*----- That's all, folks -------------------------------------------------*/

#ifdef __cplusplus
  }
#endif

#endif