| 1 | /* $NetBSD: des_setkey.c,v 1.10 2005/12/11 12:20:52 christos Exp $ */ |
| 2 | /* $KAME: des_setkey.c,v 1.6 2001/07/03 14:27:53 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 | |
| 59 | #include <sys/cdefs.h> |
| 60 | __KERNEL_RCSID(0, "$NetBSD: des_setkey.c,v 1.10 2005/12/11 12:20:52 christos Exp $" ); |
| 61 | |
| 62 | #include <sys/param.h> |
| 63 | #ifdef _KERNEL |
| 64 | #include <sys/systm.h> |
| 65 | #else |
| 66 | #include <string.h> |
| 67 | #endif |
| 68 | #include <crypto/des/des_locl.h> |
| 69 | #include <crypto/des/podd.h> |
| 70 | #include <crypto/des/sk.h> |
| 71 | |
| 72 | int des_check_key=0; |
| 73 | |
| 74 | void des_set_odd_parity(des_cblock *key) |
| 75 | { |
| 76 | unsigned int i; |
| 77 | |
| 78 | for (i=0; i<DES_KEY_SZ; i++) |
| 79 | (*key)[i]=odd_parity[(*key)[i]]; |
| 80 | } |
| 81 | |
| 82 | int des_check_key_parity(des_cblock *key) |
| 83 | { |
| 84 | unsigned int i; |
| 85 | |
| 86 | for (i=0; i<DES_KEY_SZ; i++) |
| 87 | { |
| 88 | if ((*key)[i] != odd_parity[(*key)[i]]) |
| 89 | return(0); |
| 90 | } |
| 91 | return(1); |
| 92 | } |
| 93 | |
| 94 | /* Weak and semi week keys as take from |
| 95 | * %A D.W. Davies |
| 96 | * %A W.L. Price |
| 97 | * %T Security for Computer Networks |
| 98 | * %I John Wiley & Sons |
| 99 | * %D 1984 |
| 100 | * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference |
| 101 | * (and actual cblock values). |
| 102 | */ |
| 103 | #define NUM_WEAK_KEY 16 |
| 104 | static des_cblock weak_keys[NUM_WEAK_KEY]={ |
| 105 | /* weak keys */ |
| 106 | {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01}, |
| 107 | {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE}, |
| 108 | {0x1F,0x1F,0x1F,0x1F,0x0E,0x0E,0x0E,0x0E}, |
| 109 | {0xE0,0xE0,0xE0,0xE0,0xF1,0xF1,0xF1,0xF1}, |
| 110 | /* semi-weak keys */ |
| 111 | {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE}, |
| 112 | {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01}, |
| 113 | {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1}, |
| 114 | {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E}, |
| 115 | {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1}, |
| 116 | {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01}, |
| 117 | {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE}, |
| 118 | {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E}, |
| 119 | {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E}, |
| 120 | {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01}, |
| 121 | {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE}, |
| 122 | {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}}; |
| 123 | |
| 124 | int des_is_weak_key(des_cblock *key) |
| 125 | { |
| 126 | int i; |
| 127 | |
| 128 | for (i=0; i<NUM_WEAK_KEY; i++) |
| 129 | /* Added == 0 to comparison, I obviously don't run |
| 130 | * this section very often :-(, thanks to |
| 131 | * engineering@MorningStar.Com for the fix |
| 132 | * eay 93/06/29 |
| 133 | * Another problem, I was comparing only the first 4 |
| 134 | * bytes, 97/03/18 */ |
| 135 | if (memcmp(weak_keys[i],key,sizeof(des_cblock)) == 0) return(1); |
| 136 | return(0); |
| 137 | } |
| 138 | |
| 139 | /* NOW DEFINED IN des_local.h |
| 140 | * See ecb_encrypt.c for a pseudo description of these macros. |
| 141 | * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\ |
| 142 | * (b)^=(t),\ |
| 143 | * (a)=((a)^((t)<<(n)))) |
| 144 | */ |
| 145 | |
| 146 | #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\ |
| 147 | (a)=(a)^(t)^(t>>(16-(n)))) |
| 148 | |
| 149 | int des_set_key(des_cblock *key, des_key_schedule schedule) |
| 150 | { |
| 151 | if (des_check_key) |
| 152 | { |
| 153 | return des_set_key_checked(key, schedule); |
| 154 | } |
| 155 | else |
| 156 | { |
| 157 | des_set_key_unchecked(key, schedule); |
| 158 | return 0; |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | /* return 0 if key parity is odd (correct), |
| 163 | * return -1 if key parity error, |
| 164 | * return -2 if illegal weak key. |
| 165 | */ |
| 166 | int des_set_key_checked(des_cblock *key, des_key_schedule schedule) |
| 167 | { |
| 168 | if (!des_check_key_parity(key)) |
| 169 | return(-1); |
| 170 | if (des_is_weak_key(key)) |
| 171 | return(-2); |
| 172 | des_set_key_unchecked(key, schedule); |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | void des_set_key_unchecked(des_cblock *key, des_key_schedule schedule) |
| 177 | { |
| 178 | static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0}; |
| 179 | register DES_LONG c,d,t,s,t2; |
| 180 | register const unsigned char *in; |
| 181 | register DES_LONG *k; |
| 182 | register int i; |
| 183 | |
| 184 | k = &schedule->ks.deslong[0]; |
| 185 | in = &(*key)[0]; |
| 186 | |
| 187 | c2l(in,c); |
| 188 | c2l(in,d); |
| 189 | |
| 190 | /* do PC1 in 47 simple operations :-) |
| 191 | * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov) |
| 192 | * for the inspiration. :-) */ |
| 193 | PERM_OP (d,c,t,4,0x0f0f0f0fL); |
| 194 | HPERM_OP(c,t,-2,0xcccc0000L); |
| 195 | HPERM_OP(d,t,-2,0xcccc0000L); |
| 196 | PERM_OP (d,c,t,1,0x55555555L); |
| 197 | PERM_OP (c,d,t,8,0x00ff00ffL); |
| 198 | PERM_OP (d,c,t,1,0x55555555L); |
| 199 | d= (((d&0x000000ffL)<<16L)| (d&0x0000ff00L) | |
| 200 | ((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L)); |
| 201 | c&=0x0fffffffL; |
| 202 | |
| 203 | for (i=0; i<ITERATIONS; i++) |
| 204 | { |
| 205 | if (shifts2[i]) |
| 206 | { c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); } |
| 207 | else |
| 208 | { c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); } |
| 209 | c&=0x0fffffffL; |
| 210 | d&=0x0fffffffL; |
| 211 | /* could be a few less shifts but I am to lazy at this |
| 212 | * point in time to investigate */ |
| 213 | s= des_skb[0][ (c )&0x3f ]| |
| 214 | des_skb[1][((c>> 6L)&0x03)|((c>> 7L)&0x3c)]| |
| 215 | des_skb[2][((c>>13L)&0x0f)|((c>>14L)&0x30)]| |
| 216 | des_skb[3][((c>>20L)&0x01)|((c>>21L)&0x06) | |
| 217 | ((c>>22L)&0x38)]; |
| 218 | t= des_skb[4][ (d )&0x3f ]| |
| 219 | des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]| |
| 220 | des_skb[6][ (d>>15L)&0x3f ]| |
| 221 | des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)]; |
| 222 | |
| 223 | /* table contained 0213 4657 */ |
| 224 | t2=((t<<16L)|(s&0x0000ffffL))&0xffffffffL; |
| 225 | *(k++)=ROTATE(t2,30)&0xffffffffL; |
| 226 | |
| 227 | t2=((s>>16L)|(t&0xffff0000L)); |
| 228 | *(k++)=ROTATE(t2,26)&0xffffffffL; |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | int des_key_sched(des_cblock *key, des_key_schedule schedule) |
| 233 | { |
| 234 | return(des_set_key(key,schedule)); |
| 235 | } |
| 236 | |
| 237 | void des_fixup_key_parity(des_cblock *key) |
| 238 | { |
| 239 | des_set_odd_parity(key); |
| 240 | } |
| 241 | |