set_key.c

OpenSSL 0.9.8k 最新版OpenSSL

/* crypto/des/set_key.c */
/* Copyright (C) 1995-1998 Eric Young ([e-mail])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([e-mail]).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson ([e-mail]).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library 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 cryptographic software written by
 *     Eric Young ([e-mail])"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson ([e-mail])"
 * 
 * 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 "des_locl.h"
#ifdef OPENSSL_FIPS
#include <openssl/fips.h>
#endif


OPENSSL_IMPLEMENT_GLOBAL(int,DES_check_key);	/* defaults to false */

static const unsigned char odd_parity[256]={
  1,  1,  2,  2,  4,  4,  7,  7,  8,  8, 11, 11, 13, 13, 14, 14,
 16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31,
 32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47,
 49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62,
 64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79,
 81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94,
 97, 97, 98, 98,100,100,103,103,104,104,107,107,109,109,110,110,
112,112,115,115,117,117,118,118,121,121,122,122,124,124,127,127,
128,128,131,131,133,133,134,134,137,137,138,138,140,140,143,143,
145,145,146,146,148,148,151,151,152,152,155,155,157,157,158,158,
161,161,162,162,164,164,167,167,168,168,171,171,173,173,174,174,
176,176,179,179,181,181,182,182,185,185,186,186,188,188,191,191,
193,193,194,194,196,196,199,199,200,200,203,203,205,205,206,206,
208,208,211,211,213,213,214,214,217,217,218,218,220,220,223,223,
224,224,227,227,229,229,230,230,233,233,234,234,236,236,239,239,
241,241,242,242,244,244,247,247,248,248,251,251,253,253,254,254};

void DES_set_odd_parity(DES_cblock *key)
	{
	unsigned int i;

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

int DES_check_key_parity(const_DES_cblock *key)
	{
	unsigned 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 [e-mail] (Steven Bellovin) for the reference
 * (and actual cblock values).
 */
#define NUM_WEAK_KEY	16
static const 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(const_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
		 * [e-mail] 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))))

static const DES_LONG des_skb[8][64]={
	{
	/* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
	0x00000000L,0x00000010L,0x20000000L,0x20000010L,
	0x00010000L,0x00010010L,0x20010000L,0x20010010L,
	0x00000800L,0x00000810L,0x20000800L,0x20000810L,
	0x00010800L,0x00010810L,0x20010800L,0x20010810L,
	0x00000020L,0x00000030L,0x20000020L,0x20000030L,
	0x00010020L,0x00010030L,0x20010020L,0x20010030L,
	0x00000820L,0x00000830L,0x20000820L,0x20000830L,
	0x00010820L,0x00010830L,0x20010820L,0x20010830L,
	0x00080000L,0x00080010L,0x20080000L,0x20080010L,
	0x00090000L,0x00090010L,0x20090000L,0x20090010L,
	0x00080800L,0x00080810L,0x20080800L,0x20080810L,
	0x00090800L,0x00090810L,0x20090800L,0x20090810L,
	0x00080020L,0x00080030L,0x20080020L,0x20080030L,
	0x00090020L,0x00090030L,0x20090020L,0x20090030L,
	0x00080820L,0x00080830L,0x20080820L,0x20080830L,
	0x00090820L,0x00090830L,0x20090820L,0x20090830L,
	},{
	/* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */
	0x00000000L,0x02000000L,0x00002000L,0x02002000L,
	0x00200000L,0x02200000L,0x00202000L,0x02202000L,
	0x00000004L,0x02000004L,0x00002004L,0x02002004L,
	0x00200004L,0x02200004L,0x00202004L,0x02202004L,
	0x00000400L,0x02000400L,0x00002400L,0x02002400L,
	0x00200400L,0x02200400L,0x00202400L,0x02202400L,
	0x00000404L,0x02000404L,0x00002404L,0x02002404L,
	0x00200404L,0x02200404L,0x00202404L,0x02202404L,
	0x10000000L,0x12000000L,0x10002000L,0x12002000L,
	0x10200000L,0x12200000L,0x10202000L,0x12202000L,
	0x10000004L,0x12000004L,0x10002004L,0x12002004L,
	0x10200004L,0x12200004L,0x10202004L,0x12202004L,
	0x10000400L,0x12000400L,0x10002400L,0x12002400L,
	0x10200400L,0x12200400L,0x10202400L,0x12202400L,
	0x10000404L,0x12000404L,0x10002404L,0x12002404L,
	0x10200404L,0x12200404L,0x10202404L,0x12202404L,
	},{
	/* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */
	0x00000000L,0x00000001L,0x00040000L,0x00040001L,
	0x01000000L,0x01000001L,0x01040000L,0x01040001L,
	0x00000002L,0x00000003L,0x00040002L,0x00040003L,
	0x01000002L,0x01000003L,0x01040002L,0x01040003L,