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1 | /* crypto/des/set_key.c */ |
2 | /* Copyright (C) 1995-1997 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 | ||
70 | #ifndef NOPROTO | |
71 | static int check_parity(des_cblock (*key)); | |
72 | #else | |
73 | static int check_parity(); | |
74 | #endif | |
75 | ||
76 | int des_check_key=0; | |
77 | ||
78 | void des_set_odd_parity(key) | |
79 | des_cblock (*key); | |
80 | { | |
81 | int i; | |
82 | ||
83 | for (i=0; i<DES_KEY_SZ; i++) | |
84 | (*key)[i]=odd_parity[(*key)[i]]; | |
85 | } | |
86 | ||
87 | static int check_parity(key) | |
88 | des_cblock (*key); | |
89 | { | |
90 | int i; | |
91 | ||
92 | for (i=0; i<DES_KEY_SZ; i++) | |
93 | { | |
94 | if ((*key)[i] != odd_parity[(*key)[i]]) | |
95 | return(0); | |
96 | } | |
97 | return(1); | |
98 | } | |
99 | ||
100 | /* Weak and semi week keys as take from | |
101 | * %A D.W. Davies | |
102 | * %A W.L. Price | |
103 | * %T Security for Computer Networks | |
104 | * %I John Wiley & Sons | |
105 | * %D 1984 | |
106 | * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference | |
107 | * (and actual cblock values). | |
108 | */ | |
109 | #define NUM_WEAK_KEY 16 | |
110 | static des_cblock weak_keys[NUM_WEAK_KEY]={ | |
111 | /* weak keys */ | |
112 | {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01}, | |
113 | {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE}, | |
114 | {0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F}, | |
115 | {0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0}, | |
116 | /* semi-weak keys */ | |
117 | {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE}, | |
118 | {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01}, | |
119 | {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1}, | |
120 | {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E}, | |
121 | {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1}, | |
122 | {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01}, | |
123 | {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE}, | |
124 | {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E}, | |
125 | {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E}, | |
126 | {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01}, | |
127 | {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE}, | |
128 | {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}}; | |
129 | ||
130 | int des_is_weak_key(key) | |
131 | des_cblock (*key); | |
132 | { | |
133 | int i; | |
134 | ||
135 | for (i=0; i<NUM_WEAK_KEY; i++) | |
136 | /* Added == 0 to comparision, I obviously don't run | |
137 | * this section very often :-(, thanks to | |
138 | * engineering@MorningStar.Com for the fix | |
139 | * eay 93/06/29 | |
140 | * Another problem, I was comparing only the first 4 | |
141 | * bytes, 97/03/18 */ | |
142 | if (memcmp(weak_keys[i],key,sizeof(des_cblock)) == 0) return(1); | |
143 | return(0); | |
144 | } | |
145 | ||
146 | /* NOW DEFINED IN des_local.h | |
147 | * See ecb_encrypt.c for a pseudo description of these macros. | |
148 | * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\ | |
149 | * (b)^=(t),\ | |
150 | * (a)=((a)^((t)<<(n)))) | |
151 | */ | |
152 | ||
153 | #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\ | |
154 | (a)=(a)^(t)^(t>>(16-(n)))) | |
155 | ||
156 | /* return 0 if key parity is odd (correct), | |
157 | * return -1 if key parity error, | |
158 | * return -2 if illegal weak key. | |
159 | */ | |
160 | int des_set_key(key, schedule) | |
161 | des_cblock (*key); | |
162 | des_key_schedule schedule; | |
163 | { | |
164 | static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0}; | |
165 | register DES_LONG c,d,t,s,t2; | |
166 | register unsigned char *in; | |
167 | register DES_LONG *k; | |
168 | register int i; | |
169 | ||
170 | if (des_check_key) | |
171 | { | |
172 | if (!check_parity(key)) | |
173 | return(-1); | |
174 | ||
175 | if (des_is_weak_key(key)) | |
176 | return(-2); | |
177 | } | |
178 | ||
179 | k=(DES_LONG *)schedule; | |
180 | in=(unsigned char *)key; | |
181 | ||
182 | c2l(in,c); | |
183 | c2l(in,d); | |
184 | ||
185 | /* do PC1 in 60 simple operations */ | |
186 | /* PERM_OP(d,c,t,4,0x0f0f0f0fL); | |
187 | HPERM_OP(c,t,-2, 0xcccc0000L); | |
188 | HPERM_OP(c,t,-1, 0xaaaa0000L); | |
189 | HPERM_OP(c,t, 8, 0x00ff0000L); | |
190 | HPERM_OP(c,t,-1, 0xaaaa0000L); | |
191 | HPERM_OP(d,t,-8, 0xff000000L); | |
192 | HPERM_OP(d,t, 8, 0x00ff0000L); | |
193 | HPERM_OP(d,t, 2, 0x33330000L); | |
194 | d=((d&0x00aa00aaL)<<7L)|((d&0x55005500L)>>7L)|(d&0xaa55aa55L); | |
195 | d=(d>>8)|((c&0xf0000000L)>>4); | |
196 | c&=0x0fffffffL; */ | |
197 | ||
198 | /* I now do it in 47 simple operations :-) | |
199 | * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov) | |
200 | * for the inspiration. :-) */ | |
201 | PERM_OP (d,c,t,4,0x0f0f0f0fL); | |
202 | HPERM_OP(c,t,-2,0xcccc0000L); | |
203 | HPERM_OP(d,t,-2,0xcccc0000L); | |
204 | PERM_OP (d,c,t,1,0x55555555L); | |
205 | PERM_OP (c,d,t,8,0x00ff00ffL); | |
206 | PERM_OP (d,c,t,1,0x55555555L); | |
207 | d= (((d&0x000000ffL)<<16L)| (d&0x0000ff00L) | | |
208 | ((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L)); | |
209 | c&=0x0fffffffL; | |
210 | ||
211 | for (i=0; i<ITERATIONS; i++) | |
212 | { | |
213 | if (shifts2[i]) | |
214 | { c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); } | |
215 | else | |
216 | { c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); } | |
217 | c&=0x0fffffffL; | |
218 | d&=0x0fffffffL; | |
219 | /* could be a few less shifts but I am to lazy at this | |
220 | * point in time to investigate */ | |
221 | s= des_skb[0][ (c )&0x3f ]| | |
222 | des_skb[1][((c>> 6)&0x03)|((c>> 7L)&0x3c)]| | |
223 | des_skb[2][((c>>13)&0x0f)|((c>>14L)&0x30)]| | |
224 | des_skb[3][((c>>20)&0x01)|((c>>21L)&0x06) | | |
225 | ((c>>22L)&0x38)]; | |
226 | t= des_skb[4][ (d )&0x3f ]| | |
227 | des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]| | |
228 | des_skb[6][ (d>>15L)&0x3f ]| | |
229 | des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)]; | |
230 | ||
231 | /* table contained 0213 4657 */ | |
232 | t2=((t<<16L)|(s&0x0000ffffL))&0xffffffffL; | |
233 | *(k++)=ROTATE(t2,30)&0xffffffffL; | |
234 | ||
235 | t2=((s>>16L)|(t&0xffff0000L)); | |
236 | *(k++)=ROTATE(t2,26)&0xffffffffL; | |
237 | } | |
238 | return(0); | |
239 | } | |
240 | ||
241 | int des_key_sched(key, schedule) | |
242 | des_cblock (*key); | |
243 | des_key_schedule schedule; | |
244 | { | |
245 | return(des_set_key(key,schedule)); | |
246 | } |