191671Sume/* $KAME: des_setkey.c,v 1.7 2001/09/10 04:03:58 itojun Exp $ */ 262587Sitojun 355009Sshin/* crypto/des/set_key.c */ 4130443Sobrien 555009Sshin/* Copyright (C) 1995-1996 Eric Young (eay@mincom.oz.au) 655009Sshin * All rights reserved. 755009Sshin * 855009Sshin * This file is part of an SSL implementation written 955009Sshin * by Eric Young (eay@mincom.oz.au). 1055009Sshin * The implementation was written so as to conform with Netscapes SSL 1155009Sshin * specification. This library and applications are 1255009Sshin * FREE FOR COMMERCIAL AND NON-COMMERCIAL USE 1355009Sshin * as long as the following conditions are aheared to. 1455009Sshin * 1555009Sshin * Copyright remains Eric Young's, and as such any Copyright notices in 1655009Sshin * the code are not to be removed. If this code is used in a product, 1755009Sshin * Eric Young should be given attribution as the author of the parts used. 1855009Sshin * This can be in the form of a textual message at program startup or 1955009Sshin * in documentation (online or textual) provided with the package. 2055009Sshin * 2155009Sshin * Redistribution and use in source and binary forms, with or without 2255009Sshin * modification, are permitted provided that the following conditions 2355009Sshin * are met: 2455009Sshin * 1. Redistributions of source code must retain the copyright 2555009Sshin * notice, this list of conditions and the following disclaimer. 2655009Sshin * 2. Redistributions in binary form must reproduce the above copyright 2755009Sshin * notice, this list of conditions and the following disclaimer in the 2855009Sshin * documentation and/or other materials provided with the distribution. 2955009Sshin * 3. All advertising materials mentioning features or use of this software 3055009Sshin * must display the following acknowledgement: 3155009Sshin * This product includes software developed by Eric Young (eay@mincom.oz.au) 3255009Sshin * 3355009Sshin * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 3455009Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 3555009Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 3655009Sshin * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 3755009Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3855009Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3955009Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4055009Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4155009Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 4255009Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 4355009Sshin * SUCH DAMAGE. 4455009Sshin * 4555009Sshin * The licence and distribution terms for any publically available version or 4655009Sshin * derivative of this code cannot be changed. i.e. this code cannot simply be 4755009Sshin * copied and put under another distribution licence 4855009Sshin * [including the GNU Public Licence.] 4955009Sshin */ 5055009Sshin 5155009Sshin/* set_key.c v 1.4 eay 24/9/91 5255009Sshin * 1.4 Speed up by 400% :-) 5355009Sshin * 1.3 added register declarations. 5455009Sshin * 1.2 unrolled make_key_sched a bit more 5555009Sshin * 1.1 added norm_expand_bits 5655009Sshin * 1.0 First working version 5755009Sshin */ 58130443Sobrien 59130443Sobrien#include <sys/cdefs.h> 60130443Sobrien__FBSDID("$FreeBSD$"); 61130443Sobrien 6278064Sume#include <sys/param.h> 6378064Sume#include <sys/systm.h> 6455009Sshin#include <crypto/des/des_locl.h> 6555009Sshin#include <crypto/des/podd.h> 6655009Sshin#include <crypto/des/sk.h> 6755009Sshin 6855009Sshinint des_check_key=0; 6955009Sshin 7091671Sumevoid des_set_odd_parity(des_cblock *key) 7191671Sume{ 7255009Sshin int i; 7355009Sshin 7455009Sshin for (i=0; i<DES_KEY_SZ; i++) 7555009Sshin (*key)[i]=odd_parity[(*key)[i]]; 7691671Sume} 7755009Sshin 7891671Sumeint des_check_key_parity(des_cblock *key) 7991671Sume{ 8055009Sshin int i; 8155009Sshin 8255009Sshin for (i=0; i<DES_KEY_SZ; i++) 8355009Sshin { 8455009Sshin if ((*key)[i] != odd_parity[(*key)[i]]) 8555009Sshin return(0); 8655009Sshin } 8755009Sshin return(1); 8891671Sume} 8955009Sshin 9055009Sshin/* Weak and semi week keys as take from 9155009Sshin * %A D.W. Davies 9255009Sshin * %A W.L. Price 9355009Sshin * %T Security for Computer Networks 9455009Sshin * %I John Wiley & Sons 9555009Sshin * %D 1984 9655009Sshin * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference 9755009Sshin * (and actual cblock values). 9855009Sshin */ 9962587Sitojun#define NUM_WEAK_KEY 16 10055009Sshinstatic des_cblock weak_keys[NUM_WEAK_KEY]={ 10155009Sshin /* weak keys */ 10255009Sshin {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01}, 10355009Sshin {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE}, 10491671Sume {0x1F,0x1F,0x1F,0x1F,0x0E,0x0E,0x0E,0x0E}, 10591671Sume {0xE0,0xE0,0xE0,0xE0,0xF1,0xF1,0xF1,0xF1}, 10655009Sshin /* semi-weak keys */ 10755009Sshin {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE}, 10855009Sshin {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01}, 10955009Sshin {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1}, 11055009Sshin {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E}, 11155009Sshin {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1}, 11255009Sshin {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01}, 11355009Sshin {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE}, 11455009Sshin {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E}, 11555009Sshin {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E}, 11655009Sshin {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01}, 11755009Sshin {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE}, 11855009Sshin {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}}; 11955009Sshin 12091671Sumeint des_is_weak_key(des_cblock *key) 12191671Sume{ 12255009Sshin int i; 12355009Sshin 12455009Sshin for (i=0; i<NUM_WEAK_KEY; i++) 12591671Sume /* Added == 0 to comparison, I obviously don't run 12655009Sshin * this section very often :-(, thanks to 12755009Sshin * engineering@MorningStar.Com for the fix 12891671Sume * eay 93/06/29 12991671Sume * Another problem, I was comparing only the first 4 13091671Sume * bytes, 97/03/18 */ 13191671Sume if (memcmp(weak_keys[i],key,sizeof(des_cblock)) == 0) return(1); 13255009Sshin return(0); 13391671Sume} 13455009Sshin 13555009Sshin/* NOW DEFINED IN des_local.h 13691671Sume * See ecb_encrypt.c for a pseudo description of these macros. 13755009Sshin * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\ 13855009Sshin * (b)^=(t),\ 13955009Sshin * (a)=((a)^((t)<<(n)))) 14055009Sshin */ 14155009Sshin 14262587Sitojun#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\ 14355009Sshin (a)=(a)^(t)^(t>>(16-(n)))) 14455009Sshin 14591671Sumeint des_set_key(des_cblock *key, des_key_schedule schedule) 14691671Sume{ 14791671Sume if (des_check_key) 14891671Sume { 14991671Sume return des_set_key_checked(key, schedule); 15091671Sume } 15191671Sume else 15291671Sume { 15391671Sume des_set_key_unchecked(key, schedule); 15491671Sume return 0; 15591671Sume } 15691671Sume} 15791671Sume 15855009Sshin/* return 0 if key parity is odd (correct), 15955009Sshin * return -1 if key parity error, 16055009Sshin * return -2 if illegal weak key. 16155009Sshin */ 16291671Sumeint des_set_key_checked(des_cblock *key, des_key_schedule schedule) 16391671Sume{ 16491671Sume if (!des_check_key_parity(key)) 16591671Sume return(-1); 16691671Sume if (des_is_weak_key(key)) 16791671Sume return(-2); 16891671Sume des_set_key_unchecked(key, schedule); 16991671Sume return 0; 17091671Sume} 17191671Sume 17291671Sumevoid des_set_key_unchecked(des_cblock *key, des_key_schedule schedule) 17391671Sume{ 17455009Sshin static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0}; 17591671Sume register DES_LONG c,d,t,s,t2; 17691671Sume register const unsigned char *in; 17755009Sshin register DES_LONG *k; 17855009Sshin register int i; 17955009Sshin 18091671Sume k = &schedule->ks.deslong[0]; 18191671Sume in = &(*key)[0]; 18255009Sshin 18355009Sshin c2l(in,c); 18455009Sshin c2l(in,d); 18555009Sshin 18691671Sume /* do PC1 in 47 simple operations :-) 18755009Sshin * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov) 18855009Sshin * for the inspiration. :-) */ 18955009Sshin PERM_OP (d,c,t,4,0x0f0f0f0fL); 19055009Sshin HPERM_OP(c,t,-2,0xcccc0000L); 19155009Sshin HPERM_OP(d,t,-2,0xcccc0000L); 19255009Sshin PERM_OP (d,c,t,1,0x55555555L); 19355009Sshin PERM_OP (c,d,t,8,0x00ff00ffL); 19455009Sshin PERM_OP (d,c,t,1,0x55555555L); 19555009Sshin d= (((d&0x000000ffL)<<16L)| (d&0x0000ff00L) | 19655009Sshin ((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L)); 19755009Sshin c&=0x0fffffffL; 19855009Sshin 19955009Sshin for (i=0; i<ITERATIONS; i++) 20091671Sume { 20155009Sshin if (shifts2[i]) 20255009Sshin { c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); } 20355009Sshin else 20455009Sshin { c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); } 20555009Sshin c&=0x0fffffffL; 20655009Sshin d&=0x0fffffffL; 20755009Sshin /* could be a few less shifts but I am to lazy at this 20891671Sume * point in time to investigate */ 20955009Sshin s= des_skb[0][ (c )&0x3f ]| 21091671Sume des_skb[1][((c>> 6L)&0x03)|((c>> 7L)&0x3c)]| 21191671Sume des_skb[2][((c>>13L)&0x0f)|((c>>14L)&0x30)]| 21291671Sume des_skb[3][((c>>20L)&0x01)|((c>>21L)&0x06) | 21391671Sume ((c>>22L)&0x38)]; 21455009Sshin t= des_skb[4][ (d )&0x3f ]| 21555009Sshin des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]| 21655009Sshin des_skb[6][ (d>>15L)&0x3f ]| 21755009Sshin des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)]; 21855009Sshin 21955009Sshin /* table contained 0213 4657 */ 22091671Sume t2=((t<<16L)|(s&0x0000ffffL))&0xffffffffL; 22191671Sume *(k++)=ROTATE(t2,30)&0xffffffffL; 22291671Sume 22391671Sume t2=((s>>16L)|(t&0xffff0000L)); 22491671Sume *(k++)=ROTATE(t2,26)&0xffffffffL; 22555009Sshin } 22691671Sume} 22755009Sshin 22891671Sumeint des_key_sched(des_cblock *key, des_key_schedule schedule) 22991671Sume{ 23055009Sshin return(des_set_key(key,schedule)); 23191671Sume} 23291671Sume 23391671Sumevoid des_fixup_key_parity(des_cblock *key) 23491671Sume{ 23591671Sume des_set_odd_parity(key); 23691671Sume} 237