300 lines
9.6 KiB
C
300 lines
9.6 KiB
C
/* lib/des/des_locl.h */
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/* Copyright (C) 1995-1996 Eric Young (eay@mincom.oz.au)
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* All rights reserved.
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*
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* This file is part of an SSL implementation written
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* by Eric Young (eay@mincom.oz.au).
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* The implementation was written so as to conform with Netscapes SSL
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* specification. This library and applications are
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* FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
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* as long as the following conditions are aheared to.
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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. If this code is used in a product,
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* Eric Young should be given attribution as the author of the parts 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 software developed by Eric Young (eay@mincom.oz.au)
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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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/* WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
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*
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* Always modify des_locl.org since des_locl.h is automatically generated from
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* it during SSLeay configuration.
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*
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* WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
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*/
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#ifndef HEADER_DES_LOCL_H
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#define HEADER_DES_LOCL_H
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#if defined(WIN32) || defined(WIN16)
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#ifndef MSDOS
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#define MSDOS
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#endif
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#ifndef MSDOS
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#include <unistd.h>
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#endif
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#include "des.h"
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/* the following is tweaked from a config script, that is why it is a
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* protected undef/define */
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#ifndef DES_PTR
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#undef DES_PTR
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#endif
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#ifdef MSDOS /* Visual C++ 2.1 (Windows NT/95) */
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#include <stdlib.h>
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#include <errno.h>
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#include <time.h>
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#include <io.h>
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#ifndef RAND
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#define RAND
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#endif
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#undef NOPROTO
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#endif
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#if defined(__STDC__) || defined(VMS) || defined(M_XENIX) || defined(MSDOS)
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#include <string.h>
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#endif
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#ifndef RAND
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#define RAND
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#endif
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#ifdef linux
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#undef RAND
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#endif
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#ifdef MSDOS
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#define getpid() 2
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#define RAND
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#undef NOPROTO
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#endif
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#if defined(NOCONST)
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#define const
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#endif
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#ifdef __STDC__
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#undef NOPROTO
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#endif
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#ifdef RAND
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#define srandom(s) srand(s)
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#define random rand
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#endif
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#define ITERATIONS 16
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#define HALF_ITERATIONS 8
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/* used in des_read and des_write */
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#define MAXWRITE (1024*16)
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#define BSIZE (MAXWRITE+4)
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#define c2l(c,l) (l =((DES_LONG)(*((c)++))) , \
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l|=((DES_LONG)(*((c)++)))<< 8L, \
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l|=((DES_LONG)(*((c)++)))<<16L, \
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l|=((DES_LONG)(*((c)++)))<<24L)
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/* NOTE - c is not incremented as per c2l */
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#define c2ln(c,l1,l2,n) { \
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c+=n; \
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l1=l2=0; \
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switch (n) { \
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case 8: l2 =((DES_LONG)(*(--(c))))<<24L; \
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case 7: l2|=((DES_LONG)(*(--(c))))<<16L; \
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case 6: l2|=((DES_LONG)(*(--(c))))<< 8L; \
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case 5: l2|=((DES_LONG)(*(--(c)))); \
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case 4: l1 =((DES_LONG)(*(--(c))))<<24L; \
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case 3: l1|=((DES_LONG)(*(--(c))))<<16L; \
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case 2: l1|=((DES_LONG)(*(--(c))))<< 8L; \
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case 1: l1|=((DES_LONG)(*(--(c)))); \
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} \
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}
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#define l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \
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*((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
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*((c)++)=(unsigned char)(((l)>>16L)&0xff), \
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*((c)++)=(unsigned char)(((l)>>24L)&0xff))
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/* replacements for htonl and ntohl since I have no idea what to do
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* when faced with machines with 8 byte longs. */
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#define HDRSIZE 4
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#define n2l(c,l) (l =((DES_LONG)(*((c)++)))<<24L, \
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l|=((DES_LONG)(*((c)++)))<<16L, \
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l|=((DES_LONG)(*((c)++)))<< 8L, \
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l|=((DES_LONG)(*((c)++))))
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#define l2n(l,c) (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \
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*((c)++)=(unsigned char)(((l)>>16L)&0xff), \
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*((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
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*((c)++)=(unsigned char)(((l) )&0xff))
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/* NOTE - c is not incremented as per l2c */
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#define l2cn(l1,l2,c,n) { \
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c+=n; \
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switch (n) { \
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case 8: *(--(c))=(unsigned char)(((l2)>>24L)&0xff); \
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case 7: *(--(c))=(unsigned char)(((l2)>>16L)&0xff); \
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case 6: *(--(c))=(unsigned char)(((l2)>> 8L)&0xff); \
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case 5: *(--(c))=(unsigned char)(((l2) )&0xff); \
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case 4: *(--(c))=(unsigned char)(((l1)>>24L)&0xff); \
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case 3: *(--(c))=(unsigned char)(((l1)>>16L)&0xff); \
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case 2: *(--(c))=(unsigned char)(((l1)>> 8L)&0xff); \
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case 1: *(--(c))=(unsigned char)(((l1) )&0xff); \
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} \
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}
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#if defined(WIN32)
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#define ROTATE(a,n) (_lrotr(a,n))
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#else
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#define ROTATE(a,n) (((a)>>(n))+((a)<<(32-(n))))
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#endif
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/* The changes to this macro may help or hinder, depending on the
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* compiler and the achitecture. gcc2 always seems to do well :-).
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* Inspired by Dana How <how@isl.stanford.edu>
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* DO NOT use the alternative version on machines with 8 byte longs.
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* It does not seem to work on the Alpha, even when DES_LONG is 4
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* bytes, probably an issue of accessing non-word aligned objects :-( */
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#ifdef DES_PTR
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#define D_ENCRYPT(L,R,S) { \
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u=((R^s[S ])<<2); \
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t= R^s[S+1]; \
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t=ROTATE(t,2); \
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L^= (\
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*(DES_LONG *)((unsigned char *)des_SP+0x100+((t )&0xfc))+ \
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*(DES_LONG *)((unsigned char *)des_SP+0x300+((t>> 8)&0xfc))+ \
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*(DES_LONG *)((unsigned char *)des_SP+0x500+((t>>16)&0xfc))+ \
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*(DES_LONG *)((unsigned char *)des_SP+0x700+((t>>24)&0xfc))+ \
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*(DES_LONG *)((unsigned char *)des_SP +((u )&0xfc))+ \
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*(DES_LONG *)((unsigned char *)des_SP+0x200+((u>> 8)&0xfc))+ \
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*(DES_LONG *)((unsigned char *)des_SP+0x400+((u>>16)&0xfc))+ \
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*(DES_LONG *)((unsigned char *)des_SP+0x600+((u>>24)&0xfc))); }
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#else /* original version */
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#ifdef undef
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#define D_ENCRYPT(L,R,S) \
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U.l=R^s[S+1]; \
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T.s[0]=((U.s[0]>>4)|(U.s[1]<<12))&0x3f3f; \
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T.s[1]=((U.s[1]>>4)|(U.s[0]<<12))&0x3f3f; \
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U.l=(R^s[S ])&0x3f3f3f3fL; \
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L^= des_SPtrans[1][(T.c[0])]| \
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des_SPtrans[3][(T.c[1])]| \
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des_SPtrans[5][(T.c[2])]| \
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des_SPtrans[7][(T.c[3])]| \
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des_SPtrans[0][(U.c[0])]| \
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des_SPtrans[2][(U.c[1])]| \
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des_SPtrans[4][(U.c[2])]| \
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des_SPtrans[6][(U.c[3])];
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#else
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#define D_ENCRYPT(Q,R,S) {\
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u=(R^s[S ]); \
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t=R^s[S+1]; \
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t=ROTATE(t,4); \
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Q^= des_SPtrans[1][(t )&0x3f]| \
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des_SPtrans[3][(t>> 8L)&0x3f]| \
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des_SPtrans[5][(t>>16L)&0x3f]| \
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des_SPtrans[7][(t>>24L)&0x3f]| \
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des_SPtrans[0][(u )&0x3f]| \
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des_SPtrans[2][(u>> 8L)&0x3f]| \
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des_SPtrans[4][(u>>16L)&0x3f]| \
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des_SPtrans[6][(u>>24L)&0x3f]; }
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#endif
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#endif
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/* IP and FP
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* The problem is more of a geometric problem that random bit fiddling.
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0 1 2 3 4 5 6 7 62 54 46 38 30 22 14 6
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8 9 10 11 12 13 14 15 60 52 44 36 28 20 12 4
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16 17 18 19 20 21 22 23 58 50 42 34 26 18 10 2
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24 25 26 27 28 29 30 31 to 56 48 40 32 24 16 8 0
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32 33 34 35 36 37 38 39 63 55 47 39 31 23 15 7
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40 41 42 43 44 45 46 47 61 53 45 37 29 21 13 5
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48 49 50 51 52 53 54 55 59 51 43 35 27 19 11 3
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56 57 58 59 60 61 62 63 57 49 41 33 25 17 9 1
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The output has been subject to swaps of the form
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0 1 -> 3 1 but the odd and even bits have been put into
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2 3 2 0
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different words. The main trick is to remember that
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t=((l>>size)^r)&(mask);
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r^=t;
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l^=(t<<size);
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can be used to swap and move bits between words.
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So l = 0 1 2 3 r = 16 17 18 19
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4 5 6 7 20 21 22 23
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8 9 10 11 24 25 26 27
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12 13 14 15 28 29 30 31
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becomes (for size == 2 and mask == 0x3333)
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t = 2^16 3^17 -- -- l = 0 1 16 17 r = 2 3 18 19
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6^20 7^21 -- -- 4 5 20 21 6 7 22 23
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10^24 11^25 -- -- 8 9 24 25 10 11 24 25
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14^28 15^29 -- -- 12 13 28 29 14 15 28 29
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Thanks for hints from Richard Outerbridge - he told me IP&FP
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could be done in 15 xor, 10 shifts and 5 ands.
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When I finally started to think of the problem in 2D
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I first got ~42 operations without xors. When I remembered
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how to use xors :-) I got it to its final state.
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*/
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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)^=((t)<<(n)))
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#define IP(l,r) \
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{ \
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register DES_LONG tt; \
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PERM_OP(r,l,tt, 4,0x0f0f0f0fL); \
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PERM_OP(l,r,tt,16,0x0000ffffL); \
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PERM_OP(r,l,tt, 2,0x33333333L); \
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PERM_OP(l,r,tt, 8,0x00ff00ffL); \
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PERM_OP(r,l,tt, 1,0x55555555L); \
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}
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#define FP(l,r) \
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{ \
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register DES_LONG tt; \
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PERM_OP(l,r,tt, 1,0x55555555L); \
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PERM_OP(r,l,tt, 8,0x00ff00ffL); \
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PERM_OP(l,r,tt, 2,0x33333333L); \
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PERM_OP(r,l,tt,16,0x0000ffffL); \
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PERM_OP(l,r,tt, 4,0x0f0f0f0fL); \
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}
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#endif
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