215 lines
7.1 KiB
C
215 lines
7.1 KiB
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 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. 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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#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(des_cblock (*key));
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int des_check_key=0;
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static int
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check_parity(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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if ((*key)[i] != odd_parity[(*key)[i]])
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return(0);
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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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/* weak keys */
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{0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
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{0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
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{0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F},
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{0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0},
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/* semi-weak keys */
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{0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE},
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{0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
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{0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
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{0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
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{0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
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{0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
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{0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
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{0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
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{0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
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{0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
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{0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
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{0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}};
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int
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des_is_weak_key(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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/* 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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if (bcmp(weak_keys[i], key, sizeof(des_cblock)) == 0)
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return (1);
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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]={0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0};
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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
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des_set_key(des_cblock (*key), des_key_schedule schedule)
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{
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register u_int32_t c, d, t, s;
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register unsigned char *in;
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register u_int32_t *k;
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register int i;
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if (des_check_key) {
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if (!check_parity(key))
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return(-1);
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if (des_is_weak_key(key))
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return(-2);
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}
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k = (u_int32_t *) schedule;
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in = (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) | ((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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/* 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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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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if (shifts2[i])
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{ c = ((c >> 2L) | (c << 26L)); d = ((d >> 2L) | (d << 26L)); }
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else
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{ c = ((c >> 1L) | (c << 27L)); d = ((d >> 1L) | (d << 27L)); }
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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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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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