[u/mdw/catacomb] / cast-base.h

/* -*-c-*-
 *
 * $Id: cast-base.h,v 1.3 2004/04/08 01:36:15 mdw Exp $
 *
 * Basic macros and definitions for CAST-128 and CAST-256
 *
 * (c) 2000 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------* 
 *
 * This file is part of Catacomb.
 *
 * Catacomb is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 * 
 * Catacomb 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 Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with Catacomb; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

#ifndef CATACOMB_CAST_BASE_H
#define CATACOMB_CAST_BASE_H

#ifdef __cplusplus
  extern "C" {
#endif

/*----- Header files ------------------------------------------------------*/

#include <mLib/bits.h>

/*----- Round functions ---------------------------------------------------*/

#define CAST_R_guts(km, kr, xx, yy, aop, bop, cop) do {			\
  uint32 i = km aop yy;							\
  unsigned _r = kr;							\
  i = ROL32(i, _r);							\
  xx ^= ((cast_s[0][U8(i >> 24)] bop					\
	  cast_s[1][U8(i >> 16)]) cop					\
	  cast_s[2][U8(i >>  8)]) aop					\
	  cast_s[3][U8(i >>  0)];					\
} while (0)

#define CAST_R1(km, kr, xx, yy) CAST_R_guts(km, kr, xx, yy, +, ^, -)
#define CAST_R2(km, kr, xx, yy) CAST_R_guts(km, kr, xx, yy, ^, -, +)
#define CAST_R3(km, kr, xx, yy) CAST_R_guts(km, kr, xx, yy, -, +, ^)

/*----- Global variables --------------------------------------------------*/

extern const uint32 cast_s[4][256], cast_sk[4][256];

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

#ifdef __cplusplus
  }
#endif

#endif
Commit	Line	Data
c54131f4	1	/* --c--
c54131f4	2	*
b817bfc6	3	* $Id: cast-base.h,v 1.3 2004/04/08 01:36:15 mdw Exp $
c54131f4	4	*
	5	* Basic macros and definitions for CAST-128 and CAST-256
	6	*
	7	* (c) 2000 Straylight/Edgeware
	8	*/
	9
	10	/----- Licensing notice --------------------------------------------------
	11	*
	12	* This file is part of Catacomb.
	13	*
	14	* Catacomb is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU Library General Public License as
	16	* published by the Free Software Foundation; either version 2 of the
	17	* License, or (at your option) any later version.
	18	*
	19	* Catacomb is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU Library General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU Library General Public
	25	* License along with Catacomb; if not, write to the Free
	26	* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
	27	* MA 02111-1307, USA.
	28	*/
	29
c54131f4	30	#ifndef CATACOMB_CAST_BASE_H
	31	#define CATACOMB_CAST_BASE_H
	32
	33	#ifdef __cplusplus
	34	extern "C" {
	35	#endif
	36
	37	/----- Header files ------------------------------------------------------/
	38
	39	#include <mLib/bits.h>
	40
	41	/----- Round functions ---------------------------------------------------/
	42
	43	#define CAST_R_guts(km, kr, xx, yy, aop, bop, cop) do { \
	44	uint32 i = km aop yy; \
	45	unsigned _r = kr; \
	46	i = ROL32(i, _r); \
	47	xx ^= ((cast_s[0][U8(i >> 24)] bop \
	48	cast_s[1][U8(i >> 16)]) cop \
	49	cast_s[2][U8(i >> 8)]) aop \
	50	cast_s[3][U8(i >> 0)]; \
	51	} while (0)
	52
	53	#define CAST_R1(km, kr, xx, yy) CAST_R_guts(km, kr, xx, yy, +, ^, -)
	54	#define CAST_R2(km, kr, xx, yy) CAST_R_guts(km, kr, xx, yy, ^, -, +)
	55	#define CAST_R3(km, kr, xx, yy) CAST_R_guts(km, kr, xx, yy, -, +, ^)
	56
	57	/----- Global variables --------------------------------------------------/
	58
4e66da02	59	extern const uint32 cast_s[4][256], cast_sk[4][256];
c54131f4	60
	61	/----- That's all, folks -------------------------------------------------/
	62
	63	#ifdef __cplusplus
	64	}
	65	#endif
	66
	67	#endif