234 lines
7.8 KiB
C
234 lines
7.8 KiB
C
/* crypto/des/set_key.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* set_key.c v 1.4 eay 24/9/91
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* 1.4 Speed up by 400% :-)
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* 1.3 added register declarations.
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* 1.2 unrolled make_key_sched a bit more
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* 1.1 added norm_expand_bits
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* 1.0 First working version
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*/
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#include "des_locl.h"
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#include "podd.h"
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#include "sk.h"
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static int check_parity(const des_cblock key);
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GLOBAL int des_check_key=0;
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void des_set_odd_parity(des_cblock key)
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{
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int i;
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for (i=0; i<DES_KEY_SZ; i++)
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key[i]=odd_parity[key[i]];
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}
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static int check_parity(const des_cblock key)
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{
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int i;
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for (i=0; i<DES_KEY_SZ; i++)
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{
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if (key[i] != odd_parity[key[i]])
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return(0);
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}
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return(1);
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}
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/* Weak and semi week keys as take from
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* %A D.W. Davies
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* %A W.L. Price
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* %T Security for Computer Networks
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* %I John Wiley & Sons
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* %D 1984
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* Many thanks to smb@ulysses.att.com (Steven Bellovin) for the reference
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* (and actual cblock values).
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*/
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#define NUM_WEAK_KEY 16
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static des_cblock weak_keys[NUM_WEAK_KEY]={
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/* weak keys */
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{0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
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{0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
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{0x1F,0x1F,0x1F,0x1F,0x0E,0x0E,0x0E,0x0E},
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{0xE0,0xE0,0xE0,0xE0,0xF1,0xF1,0xF1,0xF1},
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/* semi-weak keys */
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{0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE},
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{0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
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{0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
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{0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
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{0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
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{0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
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{0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
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{0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
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{0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
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{0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
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{0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
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{0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}};
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int des_is_weak_key(const des_cblock key)
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{
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int i;
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for (i=0; i<NUM_WEAK_KEY; i++)
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/* Added == 0 to comparision, I obviously don't run
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* this section very often :-(, thanks to
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* engineering@MorningStar.Com for the fix
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* eay 93/06/29
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* Another problem, I was comparing only the first 4
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* bytes, 97/03/18 */
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if (memcmp(weak_keys[i],key,sizeof(des_cblock)) == 0) return(1);
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return(0);
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}
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/* NOW DEFINED IN des_local.h
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* See ecb_encrypt.c for a pseudo description of these macros.
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* #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
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* (b)^=(t),\
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* (a)=((a)^((t)<<(n))))
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*/
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#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
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(a)=(a)^(t)^(t>>(16-(n))))
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/* return 0 if key parity is odd (correct),
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* return -1 if key parity error,
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* return -2 if illegal weak key.
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*/
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int des_set_key(const des_cblock key, des_key_schedule schedule)
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{
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static int shifts2[16]={0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0};
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register DES_LONG c,d,t,s,t2;
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register const unsigned char *in;
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register DES_LONG *k;
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register int i;
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if (des_check_key)
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{
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if (!check_parity(key))
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return(-1);
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if (des_is_weak_key(key))
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return(-2);
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}
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k=(DES_LONG *)schedule;
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in=key;
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c2l(in,c);
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c2l(in,d);
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/* do PC1 in 60 simple operations */
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/* PERM_OP(d,c,t,4,0x0f0f0f0fL);
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HPERM_OP(c,t,-2, 0xcccc0000L);
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HPERM_OP(c,t,-1, 0xaaaa0000L);
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HPERM_OP(c,t, 8, 0x00ff0000L);
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HPERM_OP(c,t,-1, 0xaaaa0000L);
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HPERM_OP(d,t,-8, 0xff000000L);
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HPERM_OP(d,t, 8, 0x00ff0000L);
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HPERM_OP(d,t, 2, 0x33330000L);
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d=((d&0x00aa00aaL)<<7L)|((d&0x55005500L)>>7L)|(d&0xaa55aa55L);
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d=(d>>8)|((c&0xf0000000L)>>4);
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c&=0x0fffffffL; */
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/* I now do it in 47 simple operations :-)
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* Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
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* for the inspiration. :-) */
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PERM_OP (d,c,t,4,0x0f0f0f0fL);
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HPERM_OP(c,t,-2,0xcccc0000L);
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HPERM_OP(d,t,-2,0xcccc0000L);
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PERM_OP (d,c,t,1,0x55555555L);
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PERM_OP (c,d,t,8,0x00ff00ffL);
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PERM_OP (d,c,t,1,0x55555555L);
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d= (((d&0x000000ffL)<<16L)| (d&0x0000ff00L) |
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((d&0x00ff0000L)>>16L)|((c&0xf0000000L)>>4L));
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c&=0x0fffffffL;
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for (i=0; i<ITERATIONS; i++)
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{
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if (shifts2[i])
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{ c=((c>>2L)|(c<<26L)); d=((d>>2L)|(d<<26L)); }
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else
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{ c=((c>>1L)|(c<<27L)); d=((d>>1L)|(d<<27L)); }
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c&=0x0fffffffL;
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d&=0x0fffffffL;
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/* could be a few less shifts but I am to lazy at this
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* point in time to investigate */
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s= des_skb[0][ (c )&0x3f ]|
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des_skb[1][((c>> 6)&0x03)|((c>> 7L)&0x3c)]|
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des_skb[2][((c>>13)&0x0f)|((c>>14L)&0x30)]|
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des_skb[3][((c>>20)&0x01)|((c>>21L)&0x06) |
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((c>>22L)&0x38)];
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t= des_skb[4][ (d )&0x3f ]|
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des_skb[5][((d>> 7L)&0x03)|((d>> 8L)&0x3c)]|
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des_skb[6][ (d>>15L)&0x3f ]|
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des_skb[7][((d>>21L)&0x0f)|((d>>22L)&0x30)];
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/* table contained 0213 4657 */
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t2=((t<<16L)|(s&0x0000ffffL))&0xffffffffL;
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*(k++)=ROTATE(t2,30)&0xffffffffL;
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t2=((s>>16L)|(t&0xffff0000L));
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*(k++)=ROTATE(t2,26)&0xffffffffL;
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}
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return(0);
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}
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int des_key_sched(const des_cblock key, des_key_schedule schedule)
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{
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return(des_set_key(key,schedule));
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}
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