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1/* crypto/des/set_key.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59/* set_key.c v 1.4 eay 24/9/91
60 * 1.4 Speed up by 400% :-)
61 * 1.3 added register declarations.
62 * 1.2 unrolled make_key_sched a bit more
63 * 1.1 added norm_expand_bits
64 * 1.0 First working version
65 */
66#include "des_locl.h"
67#include "podd.h"
68#include "sk.h"
69
70static int check_parity(const_des_cblock *key);
71OPENSSL_GLOBAL int des_check_key=0;
72
73void des_set_odd_parity(des_cblock *key)
74 {
75 int i;
76
77 for (i=0; i<DES_KEY_SZ; i++)
78 (*key)[i]=odd_parity[(*key)[i]];
79 }
80
81static int check_parity(const_des_cblock *key)
82 {
83 int i;
84
85 for (i=0; i<DES_KEY_SZ; i++)
86 {
87 if ((*key)[i] != odd_parity[(*key)[i]])
88 return(0);
89 }
90 return(1);
91 }
92
93/* Weak and semi week keys as take from
94 * %A D.W. Davies
95 * %A W.L. Price
96 * %T Security for Computer Networks
97 * %I John Wiley & Sons
98 * %D 1984
99 * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference
100 * (and actual cblock values).
101 */
102#define NUM_WEAK_KEY 16
103static des_cblock weak_keys[NUM_WEAK_KEY]={
104 /* weak keys */
105 {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
106 {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
107 {0x1F,0x1F,0x1F,0x1F,0x0E,0x0E,0x0E,0x0E},
108 {0xE0,0xE0,0xE0,0xE0,0xF1,0xF1,0xF1,0xF1},
109 /* semi-weak keys */
110 {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE},
111 {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
112 {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
113 {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
114 {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
115 {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
116 {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
117 {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
118 {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
119 {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
120 {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
121 {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}};
122
123int des_is_weak_key(const_des_cblock *key)
124 {
125 int i;
126
127 for (i=0; i<NUM_WEAK_KEY; i++)
128 /* Added == 0 to comparision, I obviously don't run
129 * this section very often :-(, thanks to
130 * engineering@MorningStar.Com for the fix
131 * eay 93/06/29
132 * Another problem, I was comparing only the first 4
133 * bytes, 97/03/18 */
134 if (memcmp(weak_keys[i],key,sizeof(des_cblock)) == 0) return(1);
135 return(0);
136 }
137
138/* NOW DEFINED IN des_local.h
139 * See ecb_encrypt.c for a pseudo description of these macros.
140 * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
141 * (b)^=(t),\
142 * (a)=((a)^((t)<<(n))))
143 */
144
145#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
146 (a)=(a)^(t)^(t>>(16-(n))))
147
148/* return 0 if key parity is odd (correct),
149 * return -1 if key parity error,
150 * return -2 if illegal weak key.
151 */
152int des_set_key(const_des_cblock *key, des_key_schedule schedule)
153 {
154 static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0};
155 register DES_LONG c,d,t,s,t2;
156 register const unsigned char *in;
157 register DES_LONG *k;
158 register int i;
159
160 if (des_check_key)
161 {
162 if (!check_parity(key))
163 return(-1);
164
165 if (des_is_weak_key(key))
166 return(-2);
167 }
168
169 k = &schedule->ks.deslong[0];
170 in = &(*key)[0];
171
172 c2l(in,c);
173 c2l(in,d);
174
175 /* do PC1 in 60 simple operations */
176/* PERM_OP(d,c,t,4,0x0f0f0f0fL);
177 HPERM_OP(c,t,-2, 0xcccc0000L);
178 HPERM_OP(c,t,-1, 0xaaaa0000L);
179 HPERM_OP(c,t, 8, 0x00ff0000L);
180 HPERM_OP(c,t,-1, 0xaaaa0000L);
181 HPERM_OP(d,t,-8, 0xff000000L);
182 HPERM_OP(d,t, 8, 0x00ff0000L);
183 HPERM_OP(d,t, 2, 0x33330000L);
184 d=((d&0x00aa00aaL)<<7L)|((d&0x55005500L)>>7L)|(d&0xaa55aa55L);
185 d=(d>>8)|((c&0xf0000000L)>>4);
186 c&=0x0fffffffL; */
187
188 /* I now do it in 47 simple operations :-)
189 * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
190 * for the inspiration. :-) */
191 PERM_OP (d,c,t,4,0x0f0f0f0fL);
192 HPERM_OP(c,t,-2,0xcccc0000L);
193 HPERM_OP(d,t,-2,0xcccc0000L);
194 PERM_OP (d,c,t,1,0x55555555L);
195 PERM_OP (c,d,t,8,0x00ff00ffL);
196 PERM_OP (d,c,t,1,0x55555555L);
197 d= (((d&0x000000ffL)<<16L)| (d&0x0000ff00L) |
198 ((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L));
199 c&=0x0fffffffL;
200
201 for (i=0; i<ITERATIONS; i++)
202 {
203 if (shifts2[i])
204 { c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); }
205 else
206 { c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); }
207 c&=0x0fffffffL;
208 d&=0x0fffffffL;
209 /* could be a few less shifts but I am to lazy at this
210 * point in time to investigate */
211 s= des_skb[0][ (c )&0x3f ]|
212 des_skb[1][((c>> 6)&0x03)|((c>> 7L)&0x3c)]|
213 des_skb[2][((c>>13)&0x0f)|((c>>14L)&0x30)]|
214 des_skb[3][((c>>20)&0x01)|((c>>21L)&0x06) |
215 ((c>>22L)&0x38)];
216 t= des_skb[4][ (d )&0x3f ]|
217 des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]|
218 des_skb[6][ (d>>15L)&0x3f ]|
219 des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)];
220
221 /* table contained 0213 4657 */
222 t2=((t<<16L)|(s&0x0000ffffL))&0xffffffffL;
223 *(k++)=ROTATE(t2,30)&0xffffffffL;
224
225 t2=((s>>16L)|(t&0xffff0000L));
226 *(k++)=ROTATE(t2,26)&0xffffffffL;
227 }
228 return(0);
229 }
230
231int des_key_sched(const_des_cblock *key, des_key_schedule schedule)
232 {
233 return(des_set_key(key,schedule));
234 }
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