[apple/xnu.git] / bsd / crypto / des / des_setkey.c

/*	$FreeBSD: src/sys/crypto/des/des_setkey.c,v 1.1.2.4 2002/03/26 10:12:25 ume Exp $	*/
/*	$KAME: des_setkey.c,v 1.7 2001/09/10 04:03:58 itojun Exp $	*/

/* crypto/des/set_key.c */
/* Copyright (C) 1995-1996 Eric Young (eay@mincom.oz.au)
 * All rights reserved.
 *
 * This file is part of an SSL implementation written
 * by Eric Young (eay@mincom.oz.au).
 * The implementation was written so as to conform with Netscapes SSL
 * specification.  This library and applications are
 * FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
 * as long as the following conditions are aheared to.
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.  If this code is used in a product,
 * Eric Young should be given attribution as the author of the parts used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by Eric Young (eay@mincom.oz.au)
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

/* set_key.c v 1.4 eay 24/9/91
 * 1.4 Speed up by 400% :-)
 * 1.3 added register declarations.
 * 1.2 unrolled make_key_sched a bit more
 * 1.1 added norm_expand_bits
 * 1.0 First working version
 */
#include <sys/param.h>
#include <sys/systm.h>
#include <crypto/des/des_locl.h>
#include <crypto/des/podd.h>
#include <crypto/des/sk.h>

int des_check_key=0;

void des_set_odd_parity(des_cblock *key)
{
	int i;

	for (i=0; i<DES_KEY_SZ; i++)
		(*key)[i]=odd_parity[(*key)[i]];
}

int des_check_key_parity(des_cblock *key)
{
	int i;

	for (i=0; i<DES_KEY_SZ; i++)
		{
		if ((*key)[i] != odd_parity[(*key)[i]])
			return(0);
		}
	return(1);
}

/* Weak and semi week keys as take from
 * %A D.W. Davies
 * %A W.L. Price
 * %T Security for Computer Networks
 * %I John Wiley & Sons
 * %D 1984
 * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference
 * (and actual cblock values).
 */
#define NUM_WEAK_KEY	16
static des_cblock weak_keys[NUM_WEAK_KEY]={
	/* weak keys */
	{0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
	{0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
	{0x1F,0x1F,0x1F,0x1F,0x0E,0x0E,0x0E,0x0E},
	{0xE0,0xE0,0xE0,0xE0,0xF1,0xF1,0xF1,0xF1},
	/* semi-weak keys */
	{0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE},
	{0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
	{0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
	{0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
	{0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
	{0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
	{0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
	{0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
	{0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
	{0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
	{0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
	{0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}};

int des_is_weak_key(des_cblock *key)
{
	int i;

	for (i=0; i<NUM_WEAK_KEY; i++)
		/* Added == 0 to comparison, I obviously don't run
		 * this section very often :-(, thanks to
		 * engineering@MorningStar.Com for the fix
		 * eay 93/06/29
		 * Another problem, I was comparing only the first 4
		 * bytes, 97/03/18 */
		if (memcmp(weak_keys[i],key,sizeof(des_cblock)) == 0) return(1);
	return(0);
}

/* NOW DEFINED IN des_local.h
 * See ecb_encrypt.c for a pseudo description of these macros. 
 * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
 * 	(b)^=(t),\
 * 	(a)=((a)^((t)<<(n))))
 */

#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
	(a)=(a)^(t)^(t>>(16-(n))))

int des_set_key(des_cblock *key, des_key_schedule schedule)
{
	if (des_check_key)
	{
		return des_set_key_checked(key, schedule);
	}
	else
	{
		des_set_key_unchecked(key, schedule);
		return 0;
	}
}

/* return 0 if key parity is odd (correct),
 * return -1 if key parity error,
 * return -2 if illegal weak key.
 */
int des_set_key_checked(des_cblock *key, des_key_schedule schedule)
{
	if (!des_check_key_parity(key))
		return(-1);
	if (des_is_weak_key(key))
		return(-2);
	des_set_key_unchecked(key, schedule);
	return 0;
}

void des_set_key_unchecked(des_cblock *key, des_key_schedule schedule)
{
	static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0};
	register DES_LONG c,d,t,s,t2;
	register const unsigned char *in;
	register DES_LONG *k;
	register int i;

	k = &schedule->ks.deslong[0];
	in = &(*key)[0];

	c2l(in,c);
	c2l(in,d);

	/* do PC1 in 47 simple operations :-)
	 * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
	 * for the inspiration. :-) */
	PERM_OP (d,c,t,4,0x0f0f0f0fL);
	HPERM_OP(c,t,-2,0xcccc0000L);
	HPERM_OP(d,t,-2,0xcccc0000L);
	PERM_OP (d,c,t,1,0x55555555L);
	PERM_OP (c,d,t,8,0x00ff00ffL);
	PERM_OP (d,c,t,1,0x55555555L);
	d=	(((d&0x000000ffL)<<16L)| (d&0x0000ff00L)     |
		 ((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L));
	c&=0x0fffffffL;

	for (i=0; i<ITERATIONS; i++)
	{
		if (shifts2[i])
			{ c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); }
		else
			{ c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); }
		c&=0x0fffffffL;
		d&=0x0fffffffL;
		/* could be a few less shifts but I am to lazy at this
	 	* point in time to investigate */
		s=	des_skb[0][ (c    )&0x3f                ]|
			des_skb[1][((c>> 6L)&0x03)|((c>> 7L)&0x3c)]|
			des_skb[2][((c>>13L)&0x0f)|((c>>14L)&0x30)]|
			des_skb[3][((c>>20L)&0x01)|((c>>21L)&0x06) |
						  	((c>>22L)&0x38)];
		t=	des_skb[4][ (d    )&0x3f                ]|
			des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]|
			des_skb[6][ (d>>15L)&0x3f                ]|
			des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)];

		/* table contained 0213 4657 */
		t2=((t<<16L)|(s&0x0000ffffL))&0xffffffffL;
		*(k++)=ROTATE(t2,30)&0xffffffffL;

		t2=((s>>16L)|(t&0xffff0000L));
		*(k++)=ROTATE(t2,26)&0xffffffffL;
	}
}

int des_key_sched(des_cblock *key, des_key_schedule schedule)
{
	return(des_set_key(key,schedule));
}

void des_fixup_key_parity(des_cblock *key)
{
	des_set_odd_parity(key);
}
Commit	Line	Data
55e303ae A	1	/* $FreeBSD: src/sys/crypto/des/des_setkey.c,v 1.1.2.4 2002/03/26 10:12:25 ume Exp $ */
55e303ae A	2	/* $KAME: des_setkey.c,v 1.7 2001/09/10 04:03:58 itojun Exp $ */
9bccf70c	3
1c79356b A	4	/* crypto/des/set_key.c */
	5	/* Copyright (C) 1995-1996 Eric Young (eay@mincom.oz.au)
	6	* All rights reserved.
	7	*
	8	* This file is part of an SSL implementation written
	9	* by Eric Young (eay@mincom.oz.au).
	10	* The implementation was written so as to conform with Netscapes SSL
	11	* specification. This library and applications are
	12	* FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
	13	* as long as the following conditions are aheared to.
	14	*
	15	* Copyright remains Eric Young's, and as such any Copyright notices in
	16	* the code are not to be removed. If this code is used in a product,
	17	* Eric Young should be given attribution as the author of the parts used.
	18	* This can be in the form of a textual message at program startup or
	19	* in documentation (online or textual) provided with the package.
	20	*
	21	* Redistribution and use in source and binary forms, with or without
	22	* modification, are permitted provided that the following conditions
	23	* are met:
	24	* 1. Redistributions of source code must retain the copyright
	25	* notice, this list of conditions and the following disclaimer.
	26	* 2. Redistributions in binary form must reproduce the above copyright
	27	* notice, this list of conditions and the following disclaimer in the
	28	* documentation and/or other materials provided with the distribution.
	29	* 3. All advertising materials mentioning features or use of this software
	30	* must display the following acknowledgement:
	31	* This product includes software developed by Eric Young (eay@mincom.oz.au)
	32	*
	33	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	34	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	35	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	36	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	37	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	38	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	39	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	40	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	41	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	42	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	43	* SUCH DAMAGE.
	44	*
	45	* The licence and distribution terms for any publically available version or
	46	* derivative of this code cannot be changed. i.e. this code cannot simply be
	47	* copied and put under another distribution licence
	48	* [including the GNU Public Licence.]
	49	*/
	50
	51	/* set_key.c v 1.4 eay 24/9/91
	52	* 1.4 Speed up by 400% :-)
	53	* 1.3 added register declarations.
	54	* 1.2 unrolled make_key_sched a bit more
	55	* 1.1 added norm_expand_bits
	56	* 1.0 First working version
	57	*/
9bccf70c A	58	#include <sys/param.h>
9bccf70c A	59	#include <sys/systm.h>
1c79356b A	60	#include <crypto/des/des_locl.h>
	61	#include <crypto/des/podd.h>
	62	#include <crypto/des/sk.h>
	63
1c79356b A	64	int des_check_key=0;
1c79356b A	65
55e303ae A	66	void des_set_odd_parity(des_cblock *key)
55e303ae A	67	{
1c79356b A	68	int i;
	69
	70	for (i=0; i<DES_KEY_SZ; i++)
	71	(key)[i]=odd_parity[(key)[i]];
55e303ae	72	}
1c79356b	73
55e303ae A	74	int des_check_key_parity(des_cblock *key)
55e303ae A	75	{
1c79356b A	76	int i;
	77
	78	for (i=0; i<DES_KEY_SZ; i++)
	79	{
	80	if ((key)[i] != odd_parity[(key)[i]])
	81	return(0);
	82	}
	83	return(1);
55e303ae	84	}
1c79356b A	85
	86	/* Weak and semi week keys as take from
	87	* %A D.W. Davies
	88	* %A W.L. Price
	89	* %T Security for Computer Networks
	90	* %I John Wiley & Sons
	91	* %D 1984
	92	* Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference
	93	* (and actual cblock values).
	94	*/
	95	#define NUM_WEAK_KEY 16
	96	static des_cblock weak_keys[NUM_WEAK_KEY]={
	97	/* weak keys */
	98	{0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
	99	{0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
55e303ae A	100	{0x1F,0x1F,0x1F,0x1F,0x0E,0x0E,0x0E,0x0E},
55e303ae A	101	{0xE0,0xE0,0xE0,0xE0,0xF1,0xF1,0xF1,0xF1},
1c79356b A	102	/* semi-weak keys */
	103	{0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE},
	104	{0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
	105	{0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
	106	{0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
	107	{0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
	108	{0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
	109	{0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
	110	{0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
	111	{0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
	112	{0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
	113	{0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
	114	{0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}};
	115
55e303ae A	116	int des_is_weak_key(des_cblock *key)
55e303ae A	117	{
1c79356b A	118	int i;
	119
	120	for (i=0; i<NUM_WEAK_KEY; i++)
55e303ae	121	/* Added == 0 to comparison, I obviously don't run
1c79356b A	122	* this section very often :-(, thanks to
1c79356b A	123	* engineering@MorningStar.Com for the fix
55e303ae A	124	* eay 93/06/29
	125	* Another problem, I was comparing only the first 4
	126	* bytes, 97/03/18 */
	127	if (memcmp(weak_keys[i],key,sizeof(des_cblock)) == 0) return(1);
1c79356b	128	return(0);
55e303ae	129	}
1c79356b A	130
1c79356b A	131	/* NOW DEFINED IN des_local.h
55e303ae	132	* See ecb_encrypt.c for a pseudo description of these macros.
1c79356b A	133	* #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
	134	* (b)^=(t),\
	135	* (a)=((a)^((t)<<(n))))
	136	*/
	137
	138	#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
	139	(a)=(a)^(t)^(t>>(16-(n))))
	140
55e303ae A	141	int des_set_key(des_cblock *key, des_key_schedule schedule)
	142	{
	143	if (des_check_key)
	144	{
	145	return des_set_key_checked(key, schedule);
	146	}
	147	else
	148	{
	149	des_set_key_unchecked(key, schedule);
	150	return 0;
	151	}
	152	}
	153
1c79356b A	154	/* return 0 if key parity is odd (correct),
	155	* return -1 if key parity error,
	156	* return -2 if illegal weak key.
	157	*/
55e303ae A	158	int des_set_key_checked(des_cblock *key, des_key_schedule schedule)
	159	{
	160	if (!des_check_key_parity(key))
	161	return(-1);
	162	if (des_is_weak_key(key))
	163	return(-2);
	164	des_set_key_unchecked(key, schedule);
	165	return 0;
	166	}
	167
	168	void des_set_key_unchecked(des_cblock *key, des_key_schedule schedule)
	169	{
1c79356b	170	static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0};
55e303ae A	171	register DES_LONG c,d,t,s,t2;
55e303ae A	172	register const unsigned char *in;
1c79356b A	173	register DES_LONG *k;
	174	register int i;
	175
55e303ae A	176	k = &schedule->ks.deslong[0];
55e303ae A	177	in = &(*key)[0];
1c79356b A	178
	179	c2l(in,c);
	180	c2l(in,d);
	181
55e303ae	182	/* do PC1 in 47 simple operations :-)
1c79356b A	183	* Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
	184	* for the inspiration. :-) */
	185	PERM_OP (d,c,t,4,0x0f0f0f0fL);
	186	HPERM_OP(c,t,-2,0xcccc0000L);
	187	HPERM_OP(d,t,-2,0xcccc0000L);
	188	PERM_OP (d,c,t,1,0x55555555L);
	189	PERM_OP (c,d,t,8,0x00ff00ffL);
	190	PERM_OP (d,c,t,1,0x55555555L);
	191	d= (((d&0x000000ffL)<<16L)\| (d&0x0000ff00L) \|
	192	((d&0x00ff0000L)>>16L)\|((c&0xf0000000L)>>4L));
	193	c&=0x0fffffffL;
	194
	195	for (i=0; i<ITERATIONS; i++)
55e303ae	196	{
1c79356b A	197	if (shifts2[i])
	198	{ c=((c>>2L)\|(c<<26L)); d=((d>>2L)\|(d<<26L)); }
	199	else
	200	{ c=((c>>1L)\|(c<<27L)); d=((d>>1L)\|(d<<27L)); }
	201	c&=0x0fffffffL;
	202	d&=0x0fffffffL;
	203	/* could be a few less shifts but I am to lazy at this
55e303ae	204	* point in time to investigate */
1c79356b	205	s= des_skb[0][ (c )&0x3f ]\|
55e303ae A	206	des_skb[1][((c>> 6L)&0x03)\|((c>> 7L)&0x3c)]\|
	207	des_skb[2][((c>>13L)&0x0f)\|((c>>14L)&0x30)]\|
	208	des_skb[3][((c>>20L)&0x01)\|((c>>21L)&0x06) \|
	209	((c>>22L)&0x38)];
1c79356b A	210	t= des_skb[4][ (d )&0x3f ]\|
	211	des_skb[5][((d>> 7L)&0x03)\|((d>> 8L)&0x3c)]\|
	212	des_skb[6][ (d>>15L)&0x3f ]\|
	213	des_skb[7][((d>>21L)&0x0f)\|((d>>22L)&0x30)];
	214
	215	/* table contained 0213 4657 */
55e303ae A	216	t2=((t<<16L)\|(s&0x0000ffffL))&0xffffffffL;
	217	*(k++)=ROTATE(t2,30)&0xffffffffL;
	218
	219	t2=((s>>16L)\|(t&0xffff0000L));
	220	*(k++)=ROTATE(t2,26)&0xffffffffL;
1c79356b	221	}
55e303ae	222	}
1c79356b	223
55e303ae A	224	int des_key_sched(des_cblock *key, des_key_schedule schedule)
55e303ae A	225	{
1c79356b	226	return(des_set_key(key,schedule));
55e303ae A	227	}
	228
	229	void des_fixup_key_parity(des_cblock *key)
	230	{
	231	des_set_odd_parity(key);
	232	}