1 /* $FreeBSD$ */ 2 /* $KAME: des_setkey.c,v 1.5 2000/11/06 13:58:09 itojun Exp $ */ 3 4 /* crypto/des/set_key.c */ 5 /* Copyright (C) 1995-1996 Eric Young (eay@mincom.oz.au) 6 * All rights reserved. 7 * 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. 14 * 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. 20 * 21 * Redistribution and use in source and binary forms, with or without 22 * modification, are permitted provided that the following conditions 23 * are met: 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) 32 * 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 43 * SUCH DAMAGE. 44 * 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.] 49 */ 50 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 57 */ 58 #include <sys/param.h> 59 #include <sys/systm.h> 60 #include <crypto/des/des_locl.h> 61 #include <crypto/des/podd.h> 62 #include <crypto/des/sk.h> 63 64 static int check_parity __P((des_cblock (*))); 65 66 int des_check_key=0; 67 68 void des_set_odd_parity(key) 69 des_cblock (*key); 70 { 71 int i; 72 73 for (i=0; i<DES_KEY_SZ; i++) 74 (*key)[i]=odd_parity[(*key)[i]]; 75 } 76 77 static int check_parity(key) 78 des_cblock (*key); 79 { 80 int i; 81 82 for (i=0; i<DES_KEY_SZ; i++) 83 { 84 if ((*key)[i] != odd_parity[(*key)[i]]) 85 return(0); 86 } 87 return(1); 88 } 89 90 /* Weak and semi week keys as take from 91 * %A D.W. Davies 92 * %A W.L. Price 93 * %T Security for Computer Networks 94 * %I John Wiley & Sons 95 * %D 1984 96 * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference 97 * (and actual cblock values). 98 */ 99 #define NUM_WEAK_KEY 16 100 static des_cblock weak_keys[NUM_WEAK_KEY]={ 101 /* weak keys */ 102 {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01}, 103 {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE}, 104 {0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F}, 105 {0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0}, 106 /* semi-weak keys */ 107 {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE}, 108 {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01}, 109 {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1}, 110 {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E}, 111 {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1}, 112 {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01}, 113 {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE}, 114 {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E}, 115 {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E}, 116 {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01}, 117 {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE}, 118 {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}}; 119 120 int des_is_weak_key(key) 121 des_cblock (*key); 122 { 123 int i; 124 125 for (i=0; i<NUM_WEAK_KEY; i++) 126 /* Added == 0 to comparision, I obviously don't run 127 * this section very often :-(, thanks to 128 * engineering@MorningStar.Com for the fix 129 * eay 93/06/29 */ 130 /* 131 if (memcmp(weak_keys[i],key,sizeof(key)) == 0) return(1); 132 */ 133 if (bcmp(weak_keys[i],key,sizeof(key)) == 0) return(1); 134 return(0); 135 } 136 137 /* NOW DEFINED IN des_local.h 138 * See ecb_encrypt.c for a pseudo description of these macros. 139 * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\ 140 * (b)^=(t),\ 141 * (a)=((a)^((t)<<(n)))) 142 */ 143 144 #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\ 145 (a)=(a)^(t)^(t>>(16-(n)))) 146 147 /* return 0 if key parity is odd (correct), 148 * return -1 if key parity error, 149 * return -2 if illegal weak key. 150 */ 151 int des_set_key(key, schedule) 152 des_cblock (*key); 153 des_key_schedule schedule; 154 { 155 static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0}; 156 register DES_LONG c,d,t,s; 157 register unsigned char *in; 158 register DES_LONG *k; 159 register int i; 160 161 if (des_check_key) 162 { 163 if (!check_parity(key)) 164 return(-1); 165 166 if (des_is_weak_key(key)) 167 return(-2); 168 } 169 170 k=(DES_LONG *)schedule; 171 in=(unsigned char *)key; 172 173 c2l(in,c); 174 c2l(in,d); 175 176 /* do PC1 in 60 simple operations */ 177 /* PERM_OP(d,c,t,4,0x0f0f0f0fL); 178 HPERM_OP(c,t,-2, 0xcccc0000L); 179 HPERM_OP(c,t,-1, 0xaaaa0000L); 180 HPERM_OP(c,t, 8, 0x00ff0000L); 181 HPERM_OP(c,t,-1, 0xaaaa0000L); 182 HPERM_OP(d,t,-8, 0xff000000L); 183 HPERM_OP(d,t, 8, 0x00ff0000L); 184 HPERM_OP(d,t, 2, 0x33330000L); 185 d=((d&0x00aa00aaL)<<7L)|((d&0x55005500L)>>7L)|(d&0xaa55aa55L); 186 d=(d>>8)|((c&0xf0000000L)>>4); 187 c&=0x0fffffffL; */ 188 189 /* I now do it in 47 simple operations :-) 190 * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov) 191 * for the inspiration. :-) */ 192 PERM_OP (d,c,t,4,0x0f0f0f0fL); 193 HPERM_OP(c,t,-2,0xcccc0000L); 194 HPERM_OP(d,t,-2,0xcccc0000L); 195 PERM_OP (d,c,t,1,0x55555555L); 196 PERM_OP (c,d,t,8,0x00ff00ffL); 197 PERM_OP (d,c,t,1,0x55555555L); 198 d= (((d&0x000000ffL)<<16L)| (d&0x0000ff00L) | 199 ((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L)); 200 c&=0x0fffffffL; 201 202 for (i=0; i<ITERATIONS; i++) 203 { 204 if (shifts2[i]) 205 { c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); } 206 else 207 { c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); } 208 c&=0x0fffffffL; 209 d&=0x0fffffffL; 210 /* could be a few less shifts but I am to lazy at this 211 * point in time to investigate */ 212 s= des_skb[0][ (c )&0x3f ]| 213 des_skb[1][((c>> 6)&0x03)|((c>> 7L)&0x3c)]| 214 des_skb[2][((c>>13)&0x0f)|((c>>14L)&0x30)]| 215 des_skb[3][((c>>20)&0x01)|((c>>21L)&0x06) | 216 ((c>>22L)&0x38)]; 217 t= des_skb[4][ (d )&0x3f ]| 218 des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]| 219 des_skb[6][ (d>>15L)&0x3f ]| 220 des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)]; 221 222 /* table contained 0213 4657 */ 223 *(k++)=((t<<16L)|(s&0x0000ffffL))&0xffffffffL; 224 s= ((s>>16L)|(t&0xffff0000L)); 225 226 s=(s<<4L)|(s>>28L); 227 *(k++)=s&0xffffffffL; 228 } 229 return(0); 230 } 231 232 int des_key_sched(key, schedule) 233 des_cblock (*key); 234 des_key_schedule schedule; 235 { 236 return(des_set_key(key,schedule)); 237 } 238