1 /* $KAME: des_setkey.c,v 1.7 2001/09/10 04:03:58 itojun Exp $ */
3 /* crypto/des/set_key.c */
5 /* Copyright (C) 1995-1996 Eric Young (eay@mincom.oz.au)
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.
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.
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
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)
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
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.]
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
59 #include <sys/cdefs.h>
60 #include <sys/param.h>
69 void des_set_odd_parity(des_cblock *key)
73 for (i=0; i<DES_KEY_SZ; i++)
74 (*key)[i]=odd_parity[(*key)[i]];
77 int des_check_key_parity(des_cblock *key)
81 for (i=0; i<DES_KEY_SZ; i++)
83 if ((*key)[i] != odd_parity[(*key)[i]])
89 /* Weak and semi week keys as take from
92 * %T Security for Computer Networks
93 * %I John Wiley & Sons
95 * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference
96 * (and actual cblock values).
98 #define NUM_WEAK_KEY 16
99 static des_cblock weak_keys[NUM_WEAK_KEY]={
101 {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
102 {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
103 {0x1F,0x1F,0x1F,0x1F,0x0E,0x0E,0x0E,0x0E},
104 {0xE0,0xE0,0xE0,0xE0,0xF1,0xF1,0xF1,0xF1},
106 {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE},
107 {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
108 {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
109 {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
110 {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
111 {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
112 {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
113 {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
114 {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
115 {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
116 {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
117 {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}};
119 int des_is_weak_key(des_cblock *key)
123 for (i=0; i<NUM_WEAK_KEY; i++)
124 /* Added == 0 to comparison, I obviously don't run
125 * this section very often :-(, thanks to
126 * engineering@MorningStar.Com for the fix
128 * Another problem, I was comparing only the first 4
130 if (memcmp(weak_keys[i],key,sizeof(des_cblock)) == 0) return(1);
134 /* NOW DEFINED IN des_local.h
135 * See ecb_encrypt.c for a pseudo description of these macros.
136 * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
138 * (a)=((a)^((t)<<(n))))
141 #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
142 (a)=(a)^(t)^(t>>(16-(n))))
144 int des_set_key(des_cblock *key, des_key_schedule schedule)
148 return des_set_key_checked(key, schedule);
152 des_set_key_unchecked(key, schedule);
157 /* return 0 if key parity is odd (correct),
158 * return -1 if key parity error,
159 * return -2 if illegal weak key.
161 int des_set_key_checked(des_cblock *key, des_key_schedule schedule)
163 if (!des_check_key_parity(key))
165 if (des_is_weak_key(key))
167 des_set_key_unchecked(key, schedule);
171 void des_set_key_unchecked(des_cblock *key, des_key_schedule schedule)
173 static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0};
174 register DES_LONG c,d,t,s,t2;
175 register const unsigned char *in;
176 register DES_LONG *k;
179 k = &schedule->ks.deslong[0];
185 /* do PC1 in 47 simple operations :-)
186 * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
187 * for the inspiration. :-) */
188 PERM_OP (d,c,t,4,0x0f0f0f0fL);
189 HPERM_OP(c,t,-2,0xcccc0000L);
190 HPERM_OP(d,t,-2,0xcccc0000L);
191 PERM_OP (d,c,t,1,0x55555555L);
192 PERM_OP (c,d,t,8,0x00ff00ffL);
193 PERM_OP (d,c,t,1,0x55555555L);
194 d= (((d&0x000000ffL)<<16L)| (d&0x0000ff00L) |
195 ((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L));
198 for (i=0; i<ITERATIONS; i++)
201 { c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); }
203 { c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); }
206 /* could be a few less shifts but I am to lazy at this
207 * point in time to investigate */
208 s= des_skb[0][ (c )&0x3f ]|
209 des_skb[1][((c>> 6L)&0x03)|((c>> 7L)&0x3c)]|
210 des_skb[2][((c>>13L)&0x0f)|((c>>14L)&0x30)]|
211 des_skb[3][((c>>20L)&0x01)|((c>>21L)&0x06) |
213 t= des_skb[4][ (d )&0x3f ]|
214 des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]|
215 des_skb[6][ (d>>15L)&0x3f ]|
216 des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)];
218 /* table contained 0213 4657 */
219 t2=((t<<16L)|(s&0x0000ffffL))&0xffffffffL;
220 *(k++)=ROTATE(t2,30)&0xffffffffL;
222 t2=((s>>16L)|(t&0xffff0000L));
223 *(k++)=ROTATE(t2,26)&0xffffffffL;
227 int des_key_sched(des_cblock *key, des_key_schedule schedule)
229 return(des_set_key(key,schedule));
232 void des_fixup_key_parity(des_cblock *key)
234 des_set_odd_parity(key);