300 lines
8.3 KiB
C
300 lines
8.3 KiB
C
/****************************************************************************
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* crypto/set_key.c
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* $OpenBSD: set_key.c,v 1.5 2021/03/12 10:22:46 jsg Exp $
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* lib/des/set_key.c
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* Copyright (C) 1995 Eric Young (eay@mincom.oz.au)
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* All rights reserved.
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*
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* This file is part of an SSL implementation written
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* by Eric Young (eay@mincom.oz.au).
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* The implementation was written so as to conform with Netscapes SSL
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* specification. This library and applications are
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* FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
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* as long as the following conditions are aheared to.
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed. If this code is used in a product,
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* Eric Young should be given attribution as the author of the parts used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by
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* Eric Young (eay@mincom.oz.au)
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed.
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* i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*
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* set_key.c v 1.4 eay 24/9/91
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* 1.4 Speed up by 400% :-)
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* 1.3 added register declarations.
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* 1.2 unrolled make_key_sched a bit more
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* 1.1 added norm_expand_bits
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* 1.0 First working version
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <strings.h>
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#include "des_locl.h"
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#include "podd.h"
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#include "sk.h"
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static int check_parity(FAR des_cblock *key);
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int des_check_key;
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static int check_parity(FAR des_cblock *key)
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{
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int i;
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for (i = 0; i < DES_KEY_SZ; i++)
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{
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if (*key[i] != odd_parity[*key[i]])
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{
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return 0;
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}
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}
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return 1;
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}
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/* Weak and semi week keys as take from
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* %A D.W. Davies
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* %A W.L. Price
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* %T Security for Computer Networks
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* %I John Wiley & Sons
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* %D 1984
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* Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference
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* (and actual cblock values).
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*/
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#define NUM_WEAK_KEY 16
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static des_cblock weak_keys[NUM_WEAK_KEY] =
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{
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/* weak keys */
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{
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01
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},
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{
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0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe
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},
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{
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0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f, 0x1f
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},
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{
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0xe0, 0xe0, 0xe0, 0xe0, 0xe0, 0xe0, 0xe0, 0xe0
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},
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/* semi-weak keys */
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{
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0x01, 0xfe, 0x01, 0xfe, 0x01, 0xfe, 0x01, 0xfe
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},
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{
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0xfe, 0x01, 0xfe, 0x01, 0xfe, 0x01, 0xfe, 0x01
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},
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{
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0x1f, 0xe0, 0x1f, 0xe0, 0x0e, 0xf1, 0x0e, 0xf1
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},
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{
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0xe0, 0x1f, 0xe0, 0x1f, 0xf1, 0x0e, 0xf1, 0x0e
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},
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{
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0x01, 0xe0, 0x01, 0xe0, 0x01, 0xf1, 0x01, 0xf1
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},
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{
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0xe0, 0x01, 0xe0, 0x01, 0xf1, 0x01, 0xf1, 0x01
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},
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{
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0x1f, 0xfe, 0x1f, 0xfe, 0x0e, 0xfe, 0x0e, 0xfe
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},
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{
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0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x0e, 0xfe, 0x0e
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},
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{
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0x01, 0x1f, 0x01, 0x1f, 0x01, 0x0e, 0x01, 0x0e
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},
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{
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0x1f, 0x01, 0x1f, 0x01, 0x0e, 0x01, 0x0e, 0x01
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},
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{
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0xe0, 0xfe, 0xe0, 0xfe, 0xf1, 0xfe, 0xf1, 0xfe
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},
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{
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0xfe, 0xe0, 0xfe, 0xe0, 0xfe, 0xf1, 0xfe, 0xf1
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}
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};
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int des_is_weak_key(FAR des_cblock *key)
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{
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int i;
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for (i = 0; i < NUM_WEAK_KEY; i++)
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{
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/* Added == 0 to comparison, I obviously don't run
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* this section very often :-(, thanks to
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* engineering@MorningStar.Com for the fix
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* eay 93/06/29
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*/
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if (bcmp(weak_keys[i], key, sizeof(des_cblock)) == 0)
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{
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return 1;
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}
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}
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return 0;
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}
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/* NOW DEFINED IN des_local.h
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* See ecb_encrypt.c for a pseudo description of these macros.
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* #define PERM_OP(a, b, t, n, m) ((t) = ((((a) >> (n))^(b)) & (m)),\
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* (b)^=(t),\
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* (a) = ((a)^((t) << (n))))
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*/
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#define HPERM_OP(a, t, n, m) ((t) = ((((a) << (16 - (n)))^(a)) & (m)),\
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(a) = (a)^(t)^(t >> (16 - (n))))
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static int shifts2[16] =
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{
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0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0
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};
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/* return 0 if key parity is odd (correct),
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* return -1 if key parity error,
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* return -2 if illegal weak key.
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*/
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int des_set_key(FAR des_cblock *key, des_key_schedule schedule)
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{
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register uint32_t c;
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register uint32_t d;
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register uint32_t t;
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register uint32_t s;
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FAR register unsigned char *in;
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FAR register uint32_t *k;
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register int i;
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if (des_check_key)
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{
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if (!check_parity(key))
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{
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return(-1);
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}
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if (des_is_weak_key(key))
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{
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return(-2);
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}
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}
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k = (FAR uint32_t *)schedule;
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in = (FAR unsigned char *)key;
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c2l(in, c);
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c2l(in, d);
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/* do PC1 in 60 simple operations */
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/* PERM_OP(d, c, t, 4, 0x0f0f0f0fL);
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* HPERM_OP(c, t, -2, 0xcccc0000L);
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* HPERM_OP(c, t, -1, 0xaaaa0000L);
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* HPERM_OP(c, t, 8, 0x00ff0000L);
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* HPERM_OP(c, t, -1, 0xaaaa0000L);
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* HPERM_OP(d, t, -8, 0xff000000L);
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* HPERM_OP(d, t, 8, 0x00ff0000L);
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* HPERM_OP(d, t, 2, 0x33330000L);
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* d = ((d & 0x00aa00aaL) << 7L) |
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* ((d & 0x55005500L) >> 7L) | (d & 0xaa55aa55L);
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* d = (d >> 8) | ((c & 0xf0000000L) >> 4);
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* c &= 0x0fffffffL;
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*/
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/* I now do it in 47 simple operations :-)
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* Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
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* for the inspiration. :-)
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*/
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PERM_OP (d, c, t, 4, 0x0f0f0f0fl);
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HPERM_OP(c, t, -2, 0xcccc0000l);
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HPERM_OP(d, t, -2, 0xcccc0000l);
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PERM_OP (d, c, t, 1, 0x55555555l);
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PERM_OP (c, d, t, 8, 0x00ff00ffl);
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PERM_OP (d, c, t, 1, 0x55555555l);
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d = (((d & 0x000000ffl) << 16l) | (d & 0x0000ff00l) |
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((d & 0x00ff0000l) >> 16l) | ((c & 0xf0000000l) >> 4l));
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c &= 0x0fffffffl;
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for (i = 0; i < ITERATIONS; i++)
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{
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if (shifts2[i])
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{
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c = ((c >> 2l) | (c << 26l)); d = ((d >> 2l) | (d << 26l));
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}
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else
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{
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c = ((c >> 1l) | (c << 27l)); d = ((d >> 1l) | (d << 27l));
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}
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c &= 0x0fffffffl;
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d &= 0x0fffffffl;
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/* could be a few less shifts but I am to lazy at this
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* point in time to investigate
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*/
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s = des_skb[0][(c) & 0x3f] |
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des_skb[1][((c >> 6) & 0x03) | ((c >> 7l) & 0x3c)] |
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des_skb[2][((c >> 13) & 0x0f) | ((c >> 14l) & 0x30)] |
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des_skb[3][((c >> 20) & 0x01) | ((c >> 21l) & 0x06) |
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((c >> 22l) & 0x38)];
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t = des_skb[4][(d) & 0x3f] |
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des_skb[5][((d >> 7l) & 0x03) | ((d >> 8l) & 0x3c)] |
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des_skb[6][(d >> 15l) & 0x3f] |
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des_skb[7][((d >> 21l) & 0x0f) | ((d >> 22l) & 0x30)];
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/* table contained 0213 4657 */
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*(k++) = ((t << 16l) | (s & 0x0000ffffl)) & 0xffffffffl;
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s = ((s >> 16l) | (t & 0xffff0000l));
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s = (s << 4l) | (s >> 28l);
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*(k++) = s & 0xffffffffl;
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}
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return 0;
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}
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