1 /* crypto/des/set_key.c */
2 /* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@mincom.oz.au).
7 * The implementation was written so as to conform with Netscapes SSL.
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@mincom.oz.au).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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@mincom.oz.au)"
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@mincom.oz.au)"
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
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.]
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
71 static int check_parity(des_cblock (*key));
73 static int check_parity();
78 void des_set_odd_parity(key)
83 for (i=0; i<DES_KEY_SZ; i++)
84 (*key)[i]=odd_parity[(*key)[i]];
87 static int check_parity(key)
92 for (i=0; i<DES_KEY_SZ; i++)
94 if ((*key)[i] != odd_parity[(*key)[i]])
100 /* Weak and semi week keys were originally as take from
103 * %T Security for Computer Networks
104 * %I John Wiley & Sons
106 * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference
107 * (and actual cblock values).
110 /* The corrected values are from FIPS 74:
111 * http://www.itl.nist.gov/fipspubs/fip74.htm
114 #define NUM_WEAK_KEY 16
115 static des_cblock weak_keys[NUM_WEAK_KEY]={
117 {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
118 {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
119 {0x1F,0x1F,0x1F,0x1F,0x0E,0x0E,0x0E,0x0E},
120 {0xE0,0xE0,0xE0,0xE0,0xF1,0xF1,0xF1,0xF1},
122 {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE},
123 {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
124 {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
125 {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
126 {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
127 {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
128 {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
129 {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
130 {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
131 {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
132 {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
133 {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}};
135 int des_is_weak_key(key)
140 for (i=0; i<NUM_WEAK_KEY; i++)
141 /* Added == 0 to comparision, I obviously don't run
142 * this section very often :-(, thanks to
143 * engineering@MorningStar.Com for the fix
145 if (memcmp(weak_keys[i],key,sizeof(key)) == 0) return(1);
149 /* NOW DEFINED IN des_local.h
150 * See ecb_encrypt.c for a pseudo description of these macros.
151 * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
153 * (a)=((a)^((t)<<(n))))
156 #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
157 (a)=(a)^(t)^(t>>(16-(n))))
159 /* return 0 if key parity is odd (correct),
160 * return -1 if key parity error,
161 * return -2 if illegal weak key.
163 int des_set_key(key, schedule)
165 des_key_schedule schedule;
167 static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0};
168 register DES_LONG c,d,t,s,t2;
169 register unsigned char *in;
170 register DES_LONG *k;
175 if (!check_parity(key))
178 if (des_is_weak_key(key))
182 k=(DES_LONG *)schedule;
183 in=(unsigned char *)key;
188 /* do PC1 in 60 simple operations */
189 /* PERM_OP(d,c,t,4,0x0f0f0f0fL);
190 HPERM_OP(c,t,-2, 0xcccc0000L);
191 HPERM_OP(c,t,-1, 0xaaaa0000L);
192 HPERM_OP(c,t, 8, 0x00ff0000L);
193 HPERM_OP(c,t,-1, 0xaaaa0000L);
194 HPERM_OP(d,t,-8, 0xff000000L);
195 HPERM_OP(d,t, 8, 0x00ff0000L);
196 HPERM_OP(d,t, 2, 0x33330000L);
197 d=((d&0x00aa00aaL)<<7L)|((d&0x55005500L)>>7L)|(d&0xaa55aa55L);
198 d=(d>>8)|((c&0xf0000000L)>>4);
201 /* I now do it in 47 simple operations :-)
202 * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
203 * for the inspiration. :-) */
204 PERM_OP (d,c,t,4,0x0f0f0f0fL);
205 HPERM_OP(c,t,-2,0xcccc0000L);
206 HPERM_OP(d,t,-2,0xcccc0000L);
207 PERM_OP (d,c,t,1,0x55555555L);
208 PERM_OP (c,d,t,8,0x00ff00ffL);
209 PERM_OP (d,c,t,1,0x55555555L);
210 d= (((d&0x000000ffL)<<16L)| (d&0x0000ff00L) |
211 ((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L));
214 for (i=0; i<ITERATIONS; i++)
217 { c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); }
219 { c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); }
222 /* could be a few less shifts but I am to lazy at this
223 * point in time to investigate */
224 s= des_skb[0][ (c )&0x3f ]|
225 des_skb[1][((c>> 6)&0x03)|((c>> 7L)&0x3c)]|
226 des_skb[2][((c>>13)&0x0f)|((c>>14L)&0x30)]|
227 des_skb[3][((c>>20)&0x01)|((c>>21L)&0x06) |
229 t= des_skb[4][ (d )&0x3f ]|
230 des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]|
231 des_skb[6][ (d>>15L)&0x3f ]|
232 des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)];
234 /* table contained 0213 4657 */
235 t2=((t<<16L)|(s&0x0000ffffL))&0xffffffffL;
236 *(k++)=ROTATE(t2,30)&0xffffffffL;
238 t2=((s>>16L)|(t&0xffff0000L));
239 *(k++)=ROTATE(t2,26)&0xffffffffL;
244 int des_key_sched(key, schedule)
246 des_key_schedule schedule;
248 return(des_set_key(key,schedule));