1/* $FreeBSD: src/sys/crypto/des/des_setkey.c,v 1.1.2.4 2002/03/26 10:12:25 ume Exp $ */ 2/* $KAME: des_setkey.c,v 1.7 2001/09/10 04:03:58 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 64int des_check_key=0; 65 66void des_set_odd_parity(des_cblock *key) 67{ 68 int i; 69 70 for (i=0; i<DES_KEY_SZ; i++) 71 (*key)[i]=odd_parity[(*key)[i]]; 72} 73 74int des_check_key_parity(des_cblock *key) 75{ 76 int i; 77 78 for (i=0; i<DES_KEY_SZ; i++) 79 { 80 if ((*key)[i] != odd_parity[(*key)[i]]) 81 return(0); 82 } 83 return(1); 84} 85 86/* Weak and semi week keys as take from 87 * %A D.W. Davies 88 * %A W.L. Price 89 * %T Security for Computer Networks 90 * %I John Wiley & Sons 91 * %D 1984 92 * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference 93 * (and actual cblock values). 94 */ 95#define NUM_WEAK_KEY 16 96static des_cblock weak_keys[NUM_WEAK_KEY]={ 97 /* weak keys */ 98 {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01}, 99 {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE}, 100 {0x1F,0x1F,0x1F,0x1F,0x0E,0x0E,0x0E,0x0E}, 101 {0xE0,0xE0,0xE0,0xE0,0xF1,0xF1,0xF1,0xF1}, 102 /* semi-weak keys */ 103 {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE}, 104 {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01}, 105 {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1}, 106 {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E}, 107 {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1}, 108 {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01}, 109 {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE}, 110 {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E}, 111 {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E}, 112 {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01}, 113 {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE}, 114 {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}}; 115 116int des_is_weak_key(des_cblock *key) 117{ 118 int i; 119 120 for (i=0; i<NUM_WEAK_KEY; i++) 121 /* Added == 0 to comparison, I obviously don't run 122 * this section very often :-(, thanks to 123 * engineering@MorningStar.Com for the fix 124 * eay 93/06/29 125 * Another problem, I was comparing only the first 4 126 * bytes, 97/03/18 */ 127 if (memcmp(weak_keys[i],key,sizeof(des_cblock)) == 0) return(1); 128 return(0); 129} 130 131/* NOW DEFINED IN des_local.h 132 * See ecb_encrypt.c for a pseudo description of these macros. 133 * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\ 134 * (b)^=(t),\ 135 * (a)=((a)^((t)<<(n)))) 136 */ 137 138#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\ 139 (a)=(a)^(t)^(t>>(16-(n)))) 140 141int des_set_key(des_cblock *key, des_key_schedule schedule) 142{ 143 if (des_check_key) 144 { 145 return des_set_key_checked(key, schedule); 146 } 147 else 148 { 149 des_set_key_unchecked(key, schedule); 150 return 0; 151 } 152} 153 154/* return 0 if key parity is odd (correct), 155 * return -1 if key parity error, 156 * return -2 if illegal weak key. 157 */ 158int des_set_key_checked(des_cblock *key, des_key_schedule schedule) 159{ 160 if (!des_check_key_parity(key)) 161 return(-1); 162 if (des_is_weak_key(key)) 163 return(-2); 164 des_set_key_unchecked(key, schedule); 165 return 0; 166} 167 168void des_set_key_unchecked(des_cblock *key, des_key_schedule schedule) 169{ 170 static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0}; 171 register DES_LONG c,d,t,s,t2; 172 register const unsigned char *in; 173 register DES_LONG *k; 174 register int i; 175 176 k = &schedule->ks.deslong[0]; 177 in = &(*key)[0]; 178 179 c2l(in,c); 180 c2l(in,d); 181 182 /* do PC1 in 47 simple operations :-) 183 * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov) 184 * for the inspiration. :-) */ 185 PERM_OP (d,c,t,4,0x0f0f0f0fL); 186 HPERM_OP(c,t,-2,0xcccc0000L); 187 HPERM_OP(d,t,-2,0xcccc0000L); 188 PERM_OP (d,c,t,1,0x55555555L); 189 PERM_OP (c,d,t,8,0x00ff00ffL); 190 PERM_OP (d,c,t,1,0x55555555L); 191 d= (((d&0x000000ffL)<<16L)| (d&0x0000ff00L) | 192 ((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L)); 193 c&=0x0fffffffL; 194 195 for (i=0; i<ITERATIONS; i++) 196 { 197 if (shifts2[i]) 198 { c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); } 199 else 200 { c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); } 201 c&=0x0fffffffL; 202 d&=0x0fffffffL; 203 /* could be a few less shifts but I am to lazy at this 204 * point in time to investigate */ 205 s= des_skb[0][ (c )&0x3f ]| 206 des_skb[1][((c>> 6L)&0x03)|((c>> 7L)&0x3c)]| 207 des_skb[2][((c>>13L)&0x0f)|((c>>14L)&0x30)]| 208 des_skb[3][((c>>20L)&0x01)|((c>>21L)&0x06) | 209 ((c>>22L)&0x38)]; 210 t= des_skb[4][ (d )&0x3f ]| 211 des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]| 212 des_skb[6][ (d>>15L)&0x3f ]| 213 des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)]; 214 215 /* table contained 0213 4657 */ 216 t2=((t<<16L)|(s&0x0000ffffL))&0xffffffffL; 217 *(k++)=ROTATE(t2,30)&0xffffffffL; 218 219 t2=((s>>16L)|(t&0xffff0000L)); 220 *(k++)=ROTATE(t2,26)&0xffffffffL; 221 } 222} 223 224int des_key_sched(des_cblock *key, des_key_schedule schedule) 225{ 226 return(des_set_key(key,schedule)); 227} 228 229void des_fixup_key_parity(des_cblock *key) 230{ 231 des_set_odd_parity(key); 232} 233