[u/mdw/catacomb] / rijndael256.c

/* -*-c-*-
 *
 * $Id: rijndael256.c,v 1.2 2004/04/08 01:36:15 mdw Exp $
 *
 * The Rijndael block cipher, 256-bit version
 *
 * (c) 2001 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.
 */

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

#include <assert.h>
#include <stdio.h>

#include <mLib/bits.h>

#include "blkc.h"
#include "gcipher.h"
#include "rijndael.h"
#include "rijndael256.h"
#include "rijndael-base.h"

/*----- Main code ---------------------------------------------------------*/

/* --- @rijndael256_init@ --- *
 *
 * Arguments:	@rijndael_ctx *k@ = pointer to context to initialize
 *		@const void *buf@ = pointer to buffer of key material
 *		@size_t sz@ = size of the key material
 *
 * Returns:	---
 *
 * Use:		Initializes a Rijndael context with a particular key.  This
 *		implementation of Rijndael doesn't impose any particular
 *		limits on the key size except that it must be multiple of 4
 *		bytes long.  256 bits seems sensible, though.
 */

void rijndael256_init(rijndael_ctx *k, const void *buf, size_t sz)
{
  rijndael_setup(k, RIJNDAEL256_BLKSZ / 4, buf, sz);
}

/* --- @rijndael256_eblk@, @rijndael256_dblk@ --- *
 *
 * Arguments:	@const rijndael_ctx *k@ = pointer to Rijndael context
 *		@const uint32 s[4]@ = pointer to source block
 *		@uint32 d[4]@ = pointer to destination block
 *
 * Returns:	---
 *
 * Use:		Low-level block encryption and decryption.
 */

#define DO(what, t,							\
	   aa, bb, cc, dd, ee, ff, gg, hh,				\
	   a, b, c, d, e, f, g, h, w) do {				\
  aa = what(t, a, b, d, e) ^ *w++;					\
  bb = what(t, b, c, e, f) ^ *w++;					\
  cc = what(t, c, d, f, g) ^ *w++;					\
  dd = what(t, d, e, g, h) ^ *w++;					\
  ee = what(t, e, f, h, a) ^ *w++;					\
  ff = what(t, f, g, a, b) ^ *w++;					\
  gg = what(t, g, h, b, c) ^ *w++;					\
  hh = what(t, h, a, c, d) ^ *w++;					\
} while (0)

#define UNDO(what, t,							\
	     aa, bb, cc, dd, ee, ff, gg, hh,				\
	     a, b, c, d, e, f, g, h, w) do {				\
  aa = what(t, a, h, f, e) ^ *w++;					\
  bb = what(t, b, a, g, f) ^ *w++;					\
  cc = what(t, c, b, h, g) ^ *w++;					\
  dd = what(t, d, c, a, h) ^ *w++;					\
  ee = what(t, e, d, b, a) ^ *w++;					\
  ff = what(t, f, e, c, b) ^ *w++;					\
  gg = what(t, g, f, d, c) ^ *w++;					\
  hh = what(t, h, g, e, d) ^ *w++;					\
} while (0)

void rijndael256_eblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst)
{
  uint32 a = s[0], b = s[1], c = s[2], d = s[3];
  uint32 e = s[4], f = s[5], g = s[6], h = s[7];
  uint32 aa, bb, cc, dd, ee, ff, gg, hh;
  const uint32 *w = k->w;

  a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++;
  e ^= *w++; f ^= *w++; g ^= *w++; h ^= *w++;

  DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
  DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
  DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
  DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
  DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
  DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
  DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
  DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
  DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
  DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
  DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
  DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
  DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
  DO(SUB, S, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);

  dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d;
  dst[4] = e; dst[5] = f; dst[6] = g; dst[7] = h;
}

void rijndael256_dblk(const rijndael_ctx *k, const uint32 *s, uint32 *dst)
{
  uint32 a = s[0], b = s[1], c = s[2], d = s[3];
  uint32 e = s[4], f = s[5], g = s[6], h = s[7];
  uint32 aa, bb, cc, dd, ee, ff, gg, hh;
  const uint32 *w = k->wi;

  a ^= *w++; b ^= *w++; c ^= *w++; d ^= *w++;
  e ^= *w++; f ^= *w++; g ^= *w++; h ^= *w++;

  UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
  UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
  UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
  UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
  UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
  UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
  UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
  UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
  UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
  UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
  UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
  UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
  UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
  UNDO(SUB, SI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);

  dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d;
  dst[4] = e; dst[5] = f; dst[6] = g; dst[7] = h;
}

BLKC_TEST(RIJNDAEL256, rijndael256)

/*----- That's all, folks -------------------------------------------------*/
Commit	Line	Data
2e8eb64a	1	/* --c--
2e8eb64a	2	*
b817bfc6	3	* $Id: rijndael256.c,v 1.2 2004/04/08 01:36:15 mdw Exp $
2e8eb64a	4	*
	5	* The Rijndael block cipher, 256-bit version
	6	*
	7	* (c) 2001 Straylight/Edgeware
	8	*/
	9
45c0fd36	10	/----- Licensing notice --------------------------------------------------
2e8eb64a	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.
45c0fd36	18	*
2e8eb64a	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.
45c0fd36	23	*
2e8eb64a	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
2e8eb64a	30	/----- Header files ------------------------------------------------------/
	31
	32	#include <assert.h>
	33	#include <stdio.h>
	34
	35	#include <mLib/bits.h>
	36
	37	#include "blkc.h"
	38	#include "gcipher.h"
	39	#include "rijndael.h"
	40	#include "rijndael256.h"
	41	#include "rijndael-base.h"
	42
	43	/----- Main code ---------------------------------------------------------/
	44
	45	/* --- @rijndael256_init@ --- *
	46	*
	47	* Arguments: @rijndael_ctx *k@ = pointer to context to initialize
	48	* @const void *buf@ = pointer to buffer of key material
	49	* @size_t sz@ = size of the key material
	50	*
	51	* Returns: ---
	52	*
	53	* Use: Initializes a Rijndael context with a particular key. This
	54	* implementation of Rijndael doesn't impose any particular
	55	* limits on the key size except that it must be multiple of 4
	56	* bytes long. 256 bits seems sensible, though.
	57	*/
	58
	59	void rijndael256_init(rijndael_ctx k, const void buf, size_t sz)
	60	{
	61	rijndael_setup(k, RIJNDAEL256_BLKSZ / 4, buf, sz);
	62	}
	63
	64	/* --- @rijndael256_eblk@, @rijndael256_dblk@ --- *
	65	*
	66	* Arguments: @const rijndael_ctx *k@ = pointer to Rijndael context
	67	* @const uint32 s[4]@ = pointer to source block
	68	* @uint32 d[4]@ = pointer to destination block
	69	*
	70	* Returns: ---
	71	*
	72	* Use: Low-level block encryption and decryption.
	73	*/
	74
	75	#define DO(what, t, \
	76	aa, bb, cc, dd, ee, ff, gg, hh, \
	77	a, b, c, d, e, f, g, h, w) do { \
	78	aa = what(t, a, b, d, e) ^ *w++; \
	79	bb = what(t, b, c, e, f) ^ *w++; \
	80	cc = what(t, c, d, f, g) ^ *w++; \
	81	dd = what(t, d, e, g, h) ^ *w++; \
	82	ee = what(t, e, f, h, a) ^ *w++; \
	83	ff = what(t, f, g, a, b) ^ *w++; \
	84	gg = what(t, g, h, b, c) ^ *w++; \
	85	hh = what(t, h, a, c, d) ^ *w++; \
	86	} while (0)
	87
	88	#define UNDO(what, t, \
	89	aa, bb, cc, dd, ee, ff, gg, hh, \
	90	a, b, c, d, e, f, g, h, w) do { \
	91	aa = what(t, a, h, f, e) ^ *w++; \
	92	bb = what(t, b, a, g, f) ^ *w++; \
	93	cc = what(t, c, b, h, g) ^ *w++; \
94	dd = what(t, d, c, a, h) ^ *w++; \
95	ee = what(t, e, d, b, a) ^ *w++; \
96	ff = what(t, f, e, c, b) ^ *w++; \
97	gg = what(t, g, f, d, c) ^ *w++; \
98	hh = what(t, h, g, e, d) ^ *w++; \
99	} while (0)
100
101	void rijndael256_eblk(const rijndael_ctx k, const uint32 s, uint32 *dst)
102	{
103	uint32 a = s[0], b = s[1], c = s[2], d = s[3];
104	uint32 e = s[4], f = s[5], g = s[6], h = s[7];
105	uint32 aa, bb, cc, dd, ee, ff, gg, hh;
78ec50fa	106	const uint32 *w = k->w;
2e8eb64a	107
	108	a ^= w++; b ^= w++; c ^= w++; d ^= w++;
	109	e ^= w++; f ^= w++; g ^= w++; h ^= w++;
	110
	111	DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
	112	DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
	113	DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
	114	DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
	115	DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
	116	DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
	117	DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
	118	DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
	119	DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
	120	DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
	121	DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
	122	DO(MIX, T, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
	123	DO(MIX, T, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
	124	DO(SUB, S, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
	125
	126	dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d;
	127	dst[4] = e; dst[5] = f; dst[6] = g; dst[7] = h;
	128	}
	129
	130	void rijndael256_dblk(const rijndael_ctx k, const uint32 s, uint32 *dst)
	131	{
	132	uint32 a = s[0], b = s[1], c = s[2], d = s[3];
	133	uint32 e = s[4], f = s[5], g = s[6], h = s[7];
	134	uint32 aa, bb, cc, dd, ee, ff, gg, hh;
78ec50fa	135	const uint32 *w = k->wi;
2e8eb64a	136
	137	a ^= w++; b ^= w++; c ^= w++; d ^= w++;
	138	e ^= w++; f ^= w++; g ^= w++; h ^= w++;
	139
	140	UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
	141	UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
	142	UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
	143	UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
	144	UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
	145	UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
	146	UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
	147	UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
	148	UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
	149	UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
	150	UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
	151	UNDO(MIX, TI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
	152	UNDO(MIX, TI, aa, bb, cc, dd, ee, ff, gg, hh, a, b, c, d, e, f, g, h, w);
	153	UNDO(SUB, SI, a, b, c, d, e, f, g, h, aa, bb, cc, dd, ee, ff, gg, hh, w);
	154
	155	dst[0] = a; dst[1] = b; dst[2] = c; dst[3] = d;
	156	dst[4] = e; dst[5] = f; dst[6] = g; dst[7] = h;
	157	}
	158
	159	BLKC_TEST(RIJNDAEL256, rijndael256)
	160
	161	/----- That's all, folks -------------------------------------------------/