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