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1/* $FreeBSD: head/sys/crypto/des/des_setkey.c 62587 2000-07-04 16:35:15Z itojun $ */
2/* $KAME: des_setkey.c,v 1.3 2000/03/27 04:36:33 sumikawa Exp $ */
1/* $FreeBSD: head/sys/crypto/des/des_setkey.c 78064 2001-06-11 12:39:29Z ume $ */
2/* $KAME: des_setkey.c,v 1.5 2000/11/06 13:58:09 itojun Exp $ */
3
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 */
58#include <sys/param.h>
59#include <sys/systm.h>
60#include <crypto/des/des_locl.h>
61#include <crypto/des/podd.h>
62#include <crypto/des/sk.h>
63
62#ifndef NOPROTO
63static int check_parity(des_cblock (*key));
64#else
65static int check_parity();
66#endif
64static int check_parity __P((des_cblock (*)));
65
66int des_check_key=0;
67
68void des_set_odd_parity(key)
69des_cblock (*key);
70 {
71 int i;
72
73 for (i=0; i<DES_KEY_SZ; i++)
74 (*key)[i]=odd_parity[(*key)[i]];
75 }
76
77static int check_parity(key)
78des_cblock (*key);
79 {
80 int i;
81
82 for (i=0; i<DES_KEY_SZ; i++)
83 {
84 if ((*key)[i] != odd_parity[(*key)[i]])
85 return(0);
86 }
87 return(1);
88 }
89
90/* Weak and semi week keys as take from
91 * %A D.W. Davies
92 * %A W.L. Price
93 * %T Security for Computer Networks
94 * %I John Wiley & Sons
95 * %D 1984
96 * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference
97 * (and actual cblock values).
98 */
99#define NUM_WEAK_KEY 16
100static des_cblock weak_keys[NUM_WEAK_KEY]={
101 /* weak keys */
102 {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
103 {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
104 {0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F},
105 {0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0},
106 /* semi-weak keys */
107 {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE},
108 {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
109 {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
110 {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
111 {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
112 {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
113 {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
114 {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
115 {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
116 {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
117 {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
118 {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}};
119
120int des_is_weak_key(key)
121des_cblock (*key);
122 {
123 int i;
124
125 for (i=0; i<NUM_WEAK_KEY; i++)
126 /* Added == 0 to comparision, I obviously don't run
127 * this section very often :-(, thanks to
128 * engineering@MorningStar.Com for the fix
129 * eay 93/06/29 */
130/*
131 if (memcmp(weak_keys[i],key,sizeof(key)) == 0) return(1);
132*/
133 if (bcmp(weak_keys[i],key,sizeof(key)) == 0) return(1);
134 return(0);
135 }
136
137/* NOW DEFINED IN des_local.h
138 * See ecb_encrypt.c for a pseudo description of these macros.
139 * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
140 * (b)^=(t),\
141 * (a)=((a)^((t)<<(n))))
142 */
143
144#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
145 (a)=(a)^(t)^(t>>(16-(n))))
146
147/* return 0 if key parity is odd (correct),
148 * return -1 if key parity error,
149 * return -2 if illegal weak key.
150 */
151int des_set_key(key, schedule)
152des_cblock (*key);
153des_key_schedule schedule;
154 {
155 static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0};
156 register DES_LONG c,d,t,s;
157 register unsigned char *in;
158 register DES_LONG *k;
159 register int i;
160
161 if (des_check_key)
162 {
163 if (!check_parity(key))
164 return(-1);
165
166 if (des_is_weak_key(key))
167 return(-2);
168 }
169
170 k=(DES_LONG *)schedule;
171 in=(unsigned char *)key;
172
173 c2l(in,c);
174 c2l(in,d);
175
176 /* do PC1 in 60 simple operations */
177/* PERM_OP(d,c,t,4,0x0f0f0f0fL);
178 HPERM_OP(c,t,-2, 0xcccc0000L);
179 HPERM_OP(c,t,-1, 0xaaaa0000L);
180 HPERM_OP(c,t, 8, 0x00ff0000L);
181 HPERM_OP(c,t,-1, 0xaaaa0000L);
182 HPERM_OP(d,t,-8, 0xff000000L);
183 HPERM_OP(d,t, 8, 0x00ff0000L);
184 HPERM_OP(d,t, 2, 0x33330000L);
185 d=((d&0x00aa00aaL)<<7L)|((d&0x55005500L)>>7L)|(d&0xaa55aa55L);
186 d=(d>>8)|((c&0xf0000000L)>>4);
187 c&=0x0fffffffL; */
188
189 /* I now do it in 47 simple operations :-)
190 * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
191 * for the inspiration. :-) */
192 PERM_OP (d,c,t,4,0x0f0f0f0fL);
193 HPERM_OP(c,t,-2,0xcccc0000L);
194 HPERM_OP(d,t,-2,0xcccc0000L);
195 PERM_OP (d,c,t,1,0x55555555L);
196 PERM_OP (c,d,t,8,0x00ff00ffL);
197 PERM_OP (d,c,t,1,0x55555555L);
198 d= (((d&0x000000ffL)<<16L)| (d&0x0000ff00L) |
199 ((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L));
200 c&=0x0fffffffL;
201
202 for (i=0; i<ITERATIONS; i++)
203 {
204 if (shifts2[i])
205 { c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); }
206 else
207 { c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); }
208 c&=0x0fffffffL;
209 d&=0x0fffffffL;
210 /* could be a few less shifts but I am to lazy at this
211 * point in time to investigate */
212 s= des_skb[0][ (c )&0x3f ]|
213 des_skb[1][((c>> 6)&0x03)|((c>> 7L)&0x3c)]|
214 des_skb[2][((c>>13)&0x0f)|((c>>14L)&0x30)]|
215 des_skb[3][((c>>20)&0x01)|((c>>21L)&0x06) |
216 ((c>>22L)&0x38)];
217 t= des_skb[4][ (d )&0x3f ]|
218 des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]|
219 des_skb[6][ (d>>15L)&0x3f ]|
220 des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)];
221
222 /* table contained 0213 4657 */
223 *(k++)=((t<<16L)|(s&0x0000ffffL))&0xffffffffL;
224 s= ((s>>16L)|(t&0xffff0000L));
225
226 s=(s<<4L)|(s>>28L);
227 *(k++)=s&0xffffffffL;
228 }
229 return(0);
230 }
231
232int des_key_sched(key, schedule)
233des_cblock (*key);
234des_key_schedule schedule;
235 {
236 return(des_set_key(key,schedule));
237 }