1 /* crypto/des/set_key.c */
\r/* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
\r * All rights reserved.
\r *
\r * This package is an SSL implementation written
\r * by Eric Young (eay@mincom.oz.au).
\r * The implementation was written so as to conform with Netscapes SSL.
\r *
\r * This library is free for commercial and non-commercial use as long as
\r * the following conditions are aheared to. The following conditions
\r * apply to all code found in this distribution, be it the RC4, RSA,
\r * lhash, DES, etc., code; not just the SSL code. The SSL documentation
\r * included with this distribution is covered by the same copyright terms
\r * except that the holder is Tim Hudson (tjh@mincom.oz.au).
\r *
\r * Copyright remains Eric Young's, and as such any Copyright notices in
\r * the code are not to be removed.
\r * If this package is used in a product, Eric Young should be given attribution
\r * as the author of the parts of the library used.
\r * This can be in the form of a textual message at program startup or
\r * in documentation (online or textual) provided with the package.
\r *
\r * Redistribution and use in source and binary forms, with or without
\r * modification, are permitted provided that the following conditions
\r * are met:
\r * 1. Redistributions of source code must retain the copyright
\r * notice, this list of conditions and the following disclaimer.
\r * 2. Redistributions in binary form must reproduce the above copyright
\r * notice, this list of conditions and the following disclaimer in the
\r * documentation and/or other materials provided with the distribution.
\r * 3. All advertising materials mentioning features or use of this software
\r * must display the following acknowledgement:
\r * "This product includes cryptographic software written by
\r * Eric Young (eay@mincom.oz.au)"
\r * The word 'cryptographic' can be left out if the rouines from the library
\r * being used are not cryptographic related :-).
\r * 4. If you include any Windows specific code (or a derivative thereof) from
\r * the apps directory (application code) you must include an acknowledgement:
\r * "This product includes software written by Tim Hudson (tjh@mincom.oz.au)"
\r *
\r * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
\r * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
\r * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
\r * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
\r * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
\r * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
\r * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
\r * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
\r * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
\r * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
\r * SUCH DAMAGE.
\r *
\r * The licence and distribution terms for any publically available version or
\r * derivative of this code cannot be changed. i.e. this code cannot simply be
\r * copied and put under another distribution licence
\r * [including the GNU Public Licence.]
\r */
\r\r/* set_key.c v 1.4 eay 24/9/91
\r * 1.4 Speed up by 400% :-)
\r * 1.3 added register declarations.
\r * 1.2 unrolled make_key_sched a bit more
\r * 1.1 added norm_expand_bits
\r * 1.0 First working version
\r */
\r#include "des_locl.h"
\r#include "podd.h"
\r#include "sk.h"
\r\r#ifndef NOPROTO
\rstatic int check_parity(des_cblock (*key));
\r#else
\rstatic int check_parity();
\r#endif
\r\rint des_check_key=0;
\r\rvoid des_set_odd_parity(key)
\rdes_cblock (*key);
\r {
\r int i;
\r\r for (i=0; i<DES_KEY_SZ; i++)
\r (*key)[i]=odd_parity[(*key)[i]];
\r }
\r\rstatic int check_parity(key)
\rdes_cblock (*key);
\r {
\r int i;
\r\r for (i=0; i<DES_KEY_SZ; i++)
\r {
\r if ((*key)[i] != odd_parity[(*key)[i]])
\r return(0);
\r }
\r return(1);
\r }
\r\r/* Weak and semi week keys as take from
\r * %A D.W. Davies
\r * %A W.L. Price
\r * %T Security for Computer Networks
\r * %I John Wiley & Sons
\r * %D 1984
\r * Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference
\r * (and actual cblock values).
\r */
\r#define NUM_WEAK_KEY 16
\rstatic des_cblock weak_keys[NUM_WEAK_KEY]={
\r /* weak keys */
\r {0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
\r {0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
\r {0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F},
\r {0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0},
\r /* semi-weak keys */
\r {0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE},
\r {0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
\r {0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
\r {0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
\r {0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
\r {0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
\r {0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
\r {0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
\r {0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
\r {0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
\r {0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
\r {0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}};
\r\rint des_is_weak_key(key)
\rdes_cblock (*key);
\r {
\r int i;
\r\r for (i=0; i<NUM_WEAK_KEY; i++)
\r /* Added == 0 to comparision, I obviously don't run
\r * this section very often :-(, thanks to
\r * engineering@MorningStar.Com for the fix
\r * eay 93/06/29 */
\r if (memcmp(weak_keys[i],key,sizeof(key)) == 0) return(1);
\r return(0);
\r }
\r\r/* NOW DEFINED IN des_local.h
\r * See ecb_encrypt.c for a pseudo description of these macros.
\r * #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
\r * (b)^=(t),\
\r * (a)=((a)^((t)<<(n))))
\r */
\r\r#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
\r (a)=(a)^(t)^(t>>(16-(n))))
\r\r/* return 0 if key parity is odd (correct),
\r * return -1 if key parity error,
\r * return -2 if illegal weak key.
\r */
\rint des_set_key(key, schedule)
\rdes_cblock (*key);
\rdes_key_schedule schedule;
\r {
\r static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0};
\r register DES_LONG c,d,t,s,t2;
\r register unsigned char *in;
\r register DES_LONG *k;
\r register int i;
\r\r if (des_check_key)
\r {
\r if (!check_parity(key))
\r return(-1);
\r\r if (des_is_weak_key(key))
\r return(-2);
\r }
\r\r k=(DES_LONG *)schedule;
\r in=(unsigned char *)key;
\r\r c2l(in,c);
\r c2l(in,d);
\r\r /* do PC1 in 60 simple operations */
\r/* PERM_OP(d,c,t,4,0x0f0f0f0fL);
\r HPERM_OP(c,t,-2, 0xcccc0000L);
\r HPERM_OP(c,t,-1, 0xaaaa0000L);
\r HPERM_OP(c,t, 8, 0x00ff0000L);
\r HPERM_OP(c,t,-1, 0xaaaa0000L);
\r HPERM_OP(d,t,-8, 0xff000000L);
\r HPERM_OP(d,t, 8, 0x00ff0000L);
\r HPERM_OP(d,t, 2, 0x33330000L);
\r d=((d&0x00aa00aaL)<<7L)|((d&0x55005500L)>>7L)|(d&0xaa55aa55L);
\r d=(d>>8)|((c&0xf0000000L)>>4);
\r c&=0x0fffffffL; */
\r\r /* I now do it in 47 simple operations :-)
\r * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
\r * for the inspiration. :-) */
\r PERM_OP (d,c,t,4,0x0f0f0f0fL);
\r HPERM_OP(c,t,-2,0xcccc0000L);
\r HPERM_OP(d,t,-2,0xcccc0000L);
\r PERM_OP (d,c,t,1,0x55555555L);
\r PERM_OP (c,d,t,8,0x00ff00ffL);
\r PERM_OP (d,c,t,1,0x55555555L);
\r d= (((d&0x000000ffL)<<16L)| (d&0x0000ff00L) |
\r ((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L));
\r c&=0x0fffffffL;
\r\r for (i=0; i<ITERATIONS; i++)
\r {
\r if (shifts2[i])
\r { c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); }
\r else
\r { c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); }
\r c&=0x0fffffffL;
\r d&=0x0fffffffL;
\r /* could be a few less shifts but I am to lazy at this
\r * point in time to investigate */
\r s= des_skb[0][ (c )&0x3f ]|
\r des_skb[1][((c>> 6)&0x03)|((c>> 7L)&0x3c)]|
\r des_skb[2][((c>>13)&0x0f)|((c>>14L)&0x30)]|
\r des_skb[3][((c>>20)&0x01)|((c>>21L)&0x06) |
\r ((c>>22L)&0x38)];
\r t= des_skb[4][ (d )&0x3f ]|
\r des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]|
\r des_skb[6][ (d>>15L)&0x3f ]|
\r des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)];
\r\r /* table contained 0213 4657 */
\r t2=((t<<16L)|(s&0x0000ffffL))&0xffffffffL;
\r *(k++)=ROTATE(t2,30)&0xffffffffL;
\r\r t2=((s>>16L)|(t&0xffff0000L));
\r *(k++)=ROTATE(t2,26)&0xffffffffL;
\r }
\r return(0);
\r }
\r\rint des_key_sched(key, schedule)
\rdes_cblock (*key);
\rdes_key_schedule schedule;
\r {
\r return(des_set_key(key,schedule));
\r }
\r