set_key.c revision 55714
1191783Srmacklem/* crypto/des/set_key.c */ 2191783Srmacklem/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3191783Srmacklem * All rights reserved. 4191783Srmacklem * 5191783Srmacklem * This package is an SSL implementation written 6191783Srmacklem * by Eric Young (eay@cryptsoft.com). 7191783Srmacklem * The implementation was written so as to conform with Netscapes SSL. 8191783Srmacklem * 9191783Srmacklem * This library is free for commercial and non-commercial use as long as 10191783Srmacklem * the following conditions are aheared to. The following conditions 11191783Srmacklem * apply to all code found in this distribution, be it the RC4, RSA, 12191783Srmacklem * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13191783Srmacklem * included with this distribution is covered by the same copyright terms 14191783Srmacklem * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15191783Srmacklem * 16191783Srmacklem * Copyright remains Eric Young's, and as such any Copyright notices in 17191783Srmacklem * the code are not to be removed. 18191783Srmacklem * If this package is used in a product, Eric Young should be given attribution 19191783Srmacklem * as the author of the parts of the library used. 20191783Srmacklem * This can be in the form of a textual message at program startup or 21191783Srmacklem * in documentation (online or textual) provided with the package. 22191783Srmacklem * 23191783Srmacklem * Redistribution and use in source and binary forms, with or without 24191783Srmacklem * modification, are permitted provided that the following conditions 25191783Srmacklem * are met: 26191783Srmacklem * 1. Redistributions of source code must retain the copyright 27191783Srmacklem * notice, this list of conditions and the following disclaimer. 28191783Srmacklem * 2. Redistributions in binary form must reproduce the above copyright 29191783Srmacklem * notice, this list of conditions and the following disclaimer in the 30191783Srmacklem * documentation and/or other materials provided with the distribution. 31191783Srmacklem * 3. All advertising materials mentioning features or use of this software 32191783Srmacklem * must display the following acknowledgement: 33191783Srmacklem * "This product includes cryptographic software written by 34191783Srmacklem * Eric Young (eay@cryptsoft.com)" 35191783Srmacklem * The word 'cryptographic' can be left out if the rouines from the library 36191783Srmacklem * being used are not cryptographic related :-). 37224778Srwatson * 4. If you include any Windows specific code (or a derivative thereof) from 38224778Srwatson * the apps directory (application code) you must include an acknowledgement: 39191783Srmacklem * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40191783Srmacklem * 41191783Srmacklem * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42191783Srmacklem * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43191783Srmacklem * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44191783Srmacklem * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45191783Srmacklem * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46214255Srmacklem * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47191783Srmacklem * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48192503Srmacklem * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49192503Srmacklem * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50191783Srmacklem * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51219028Snetchild * SUCH DAMAGE. 52219028Snetchild * 53191783Srmacklem * The licence and distribution terms for any publically available version or 54191783Srmacklem * derivative of this code cannot be changed. i.e. this code cannot simply be 55191783Srmacklem * copied and put under another distribution licence 56191783Srmacklem * [including the GNU Public Licence.] 57191783Srmacklem */ 58191783Srmacklem 59220530Srmacklem/* set_key.c v 1.4 eay 24/9/91 60243738Srmacklem * 1.4 Speed up by 400% :-) 61191783Srmacklem * 1.3 added register declarations. 62191783Srmacklem * 1.2 unrolled make_key_sched a bit more 63255532Srmacklem * 1.1 added norm_expand_bits 64255532Srmacklem * 1.0 First working version 65191783Srmacklem */ 66191783Srmacklem#include "des_locl.h" 67191783Srmacklem#include "podd.h" 68217432Srmacklem#include "sk.h" 69217432Srmacklem 70217432Srmacklemstatic int check_parity(const_des_cblock *key); 71217432SrmacklemOPENSSL_GLOBAL int des_check_key=0; 72192503Srmacklem 73191783Srmacklemvoid des_set_odd_parity(des_cblock *key) 74192255Srmacklem { 75192255Srmacklem int i; 76191783Srmacklem 77220645Srmacklem for (i=0; i<DES_KEY_SZ; i++) 78191783Srmacklem (*key)[i]=odd_parity[(*key)[i]]; 79191783Srmacklem } 80191783Srmacklem 81192255Srmacklemstatic int check_parity(const_des_cblock *key) 82192255Srmacklem { 83221615Srmacklem int i; 84221615Srmacklem 85220645Srmacklem for (i=0; i<DES_KEY_SZ; i++) 86221615Srmacklem { 87192255Srmacklem if ((*key)[i] != odd_parity[(*key)[i]]) 88221615Srmacklem return(0); 89192255Srmacklem } 90221615Srmacklem return(1); 91192255Srmacklem } 92221615Srmacklem 93192255Srmacklem/* Weak and semi week keys as take from 94191783Srmacklem * %A D.W. Davies 95229617Sjhb * %A W.L. Price 96229617Sjhb * %T Security for Computer Networks 97191783Srmacklem * %I John Wiley & Sons 98191783Srmacklem * %D 1984 99191783Srmacklem * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference 100191783Srmacklem * (and actual cblock values). 101191783Srmacklem */ 102191783Srmacklem#define NUM_WEAK_KEY 16 103229617Sjhbstatic des_cblock weak_keys[NUM_WEAK_KEY]={ 104191783Srmacklem /* weak keys */ 105191783Srmacklem {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01}, 106191783Srmacklem {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE}, 107191783Srmacklem {0x1F,0x1F,0x1F,0x1F,0x0E,0x0E,0x0E,0x0E}, 108191783Srmacklem {0xE0,0xE0,0xE0,0xE0,0xF1,0xF1,0xF1,0xF1}, 109191783Srmacklem /* semi-weak keys */ 110229617Sjhb {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE}, 111229617Sjhb {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01}, 112229617Sjhb {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1}, 113229617Sjhb {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E}, 114229617Sjhb {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1}, 115229617Sjhb {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01}, 116229617Sjhb {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE}, 117229617Sjhb {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E}, 118229617Sjhb {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E}, 119229617Sjhb {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01}, 120229617Sjhb {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE}, 121229617Sjhb {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}}; 122229617Sjhb 123229617Sjhbint des_is_weak_key(const_des_cblock *key) 124229617Sjhb { 125229617Sjhb int i; 126229617Sjhb 127229617Sjhb for (i=0; i<NUM_WEAK_KEY; i++) 128229617Sjhb /* Added == 0 to comparision, I obviously don't run 129229617Sjhb * this section very often :-(, thanks to 130229617Sjhb * engineering@MorningStar.Com for the fix 131229617Sjhb * eay 93/06/29 132229617Sjhb * Another problem, I was comparing only the first 4 133229617Sjhb * bytes, 97/03/18 */ 134229617Sjhb if (memcmp(weak_keys[i],key,sizeof(des_cblock)) == 0) return(1); 135229617Sjhb return(0); 136229617Sjhb } 137229617Sjhb 138229617Sjhb/* NOW DEFINED IN des_local.h 139229617Sjhb * See ecb_encrypt.c for a pseudo description of these macros. 140229617Sjhb * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\ 141229617Sjhb * (b)^=(t),\ 142229617Sjhb * (a)=((a)^((t)<<(n)))) 143229617Sjhb */ 144229617Sjhb 145229617Sjhb#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\ 146229617Sjhb (a)=(a)^(t)^(t>>(16-(n)))) 147229617Sjhb 148229617Sjhb/* return 0 if key parity is odd (correct), 149229617Sjhb * return -1 if key parity error, 150229617Sjhb * return -2 if illegal weak key. 151229617Sjhb */ 152229617Sjhbint des_set_key(const_des_cblock *key, des_key_schedule schedule) 153229617Sjhb { 154229617Sjhb static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0}; 155229617Sjhb register DES_LONG c,d,t,s,t2; 156229617Sjhb register const unsigned char *in; 157229617Sjhb register DES_LONG *k; 158229617Sjhb register int i; 159229617Sjhb 160229617Sjhb if (des_check_key) 161229617Sjhb { 162229617Sjhb if (!check_parity(key)) 163229617Sjhb return(-1); 164229617Sjhb 165229617Sjhb if (des_is_weak_key(key)) 166229617Sjhb return(-2); 167191783Srmacklem } 168191783Srmacklem 169191783Srmacklem k = &schedule->ks.deslong[0]; 170191783Srmacklem in = &(*key)[0]; 171216693Srmacklem 172191783Srmacklem c2l(in,c); 173191783Srmacklem c2l(in,d); 174191783Srmacklem 175216693Srmacklem /* do PC1 in 60 simple operations */ 176216693Srmacklem/* PERM_OP(d,c,t,4,0x0f0f0f0fL); 177216693Srmacklem HPERM_OP(c,t,-2, 0xcccc0000L); 178216693Srmacklem HPERM_OP(c,t,-1, 0xaaaa0000L); 179216693Srmacklem HPERM_OP(c,t, 8, 0x00ff0000L); 180216693Srmacklem HPERM_OP(c,t,-1, 0xaaaa0000L); 181224083Szack HPERM_OP(d,t,-8, 0xff000000L); 182216693Srmacklem HPERM_OP(d,t, 8, 0x00ff0000L); 183224081Szack HPERM_OP(d,t, 2, 0x33330000L); 184216693Srmacklem d=((d&0x00aa00aaL)<<7L)|((d&0x55005500L)>>7L)|(d&0xaa55aa55L); 185191783Srmacklem d=(d>>8)|((c&0xf0000000L)>>4); 186191783Srmacklem c&=0x0fffffffL; */ 187216693Srmacklem 188224082Szack /* I now do it in 47 simple operations :-) 189224086Szack * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov) 190224086Szack * for the inspiration. :-) */ 191191783Srmacklem PERM_OP (d,c,t,4,0x0f0f0f0fL); 192191783Srmacklem HPERM_OP(c,t,-2,0xcccc0000L); 193191783Srmacklem HPERM_OP(d,t,-2,0xcccc0000L); 194191783Srmacklem PERM_OP (d,c,t,1,0x55555555L); 195191783Srmacklem PERM_OP (c,d,t,8,0x00ff00ffL); 196191783Srmacklem PERM_OP (d,c,t,1,0x55555555L); 197191783Srmacklem d= (((d&0x000000ffL)<<16L)| (d&0x0000ff00L) | 198191783Srmacklem ((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L)); 199191783Srmacklem c&=0x0fffffffL; 200191783Srmacklem 201191783Srmacklem for (i=0; i<ITERATIONS; i++) 202191783Srmacklem { 203191783Srmacklem if (shifts2[i]) 204191783Srmacklem { c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); } 205224086Szack else 206224086Szack { c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); } 207191783Srmacklem c&=0x0fffffffL; 208191783Srmacklem d&=0x0fffffffL; 209191783Srmacklem /* could be a few less shifts but I am to lazy at this 210191783Srmacklem * point in time to investigate */ 211191783Srmacklem s= des_skb[0][ (c )&0x3f ]| 212191783Srmacklem des_skb[1][((c>> 6)&0x03)|((c>> 7L)&0x3c)]| 213200999Srmacklem des_skb[2][((c>>13)&0x0f)|((c>>14L)&0x30)]| 214200999Srmacklem des_skb[3][((c>>20)&0x01)|((c>>21L)&0x06) | 215200999Srmacklem ((c>>22L)&0x38)]; 216191783Srmacklem t= des_skb[4][ (d )&0x3f ]| 217191783Srmacklem des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]| 218191783Srmacklem des_skb[6][ (d>>15L)&0x3f ]| 219191783Srmacklem des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)]; 220191783Srmacklem 221200999Srmacklem /* table contained 0213 4657 */ 222200999Srmacklem t2=((t<<16L)|(s&0x0000ffffL))&0xffffffffL; 223200999Srmacklem *(k++)=ROTATE(t2,30)&0xffffffffL; 224191783Srmacklem 225191783Srmacklem t2=((s>>16L)|(t&0xffff0000L)); 226191783Srmacklem *(k++)=ROTATE(t2,26)&0xffffffffL; 227191783Srmacklem } 228216893Srmacklem return(0); 229224086Szack } 230224086Szack 231224086Szackint des_key_sched(const_des_cblock *key, des_key_schedule schedule) 232224086Szack { 233216893Srmacklem return(des_set_key(key,schedule)); 234191783Srmacklem } 235191783Srmacklem