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Diffstat (limited to 'src/lib/libcrypto/des/set_key.c')
-rw-r--r-- | src/lib/libcrypto/des/set_key.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/src/lib/libcrypto/des/set_key.c b/src/lib/libcrypto/des/set_key.c new file mode 100644 index 0000000000..c3bcd7ee2b --- /dev/null +++ b/src/lib/libcrypto/des/set_key.c | |||
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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 | |||
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 | } | ||