403 lines
12 KiB
C
403 lines
12 KiB
C
/* crypto/des/des_locl.h */
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/* Copyright (C) 1995-1997 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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* $FreeBSD$
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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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#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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#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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#include "des.h"
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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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/* Don't worry about the LOAD_DATA() stuff, that is used by
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* fcrypt() to add it's little bit to the front */
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#ifdef DES_FCRYPT
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#define LOAD_DATA_tmp(R,S,u,t,E0,E1) \
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{ DES_LONG tmp; LOAD_DATA(R,S,u,t,E0,E1,tmp); }
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#define LOAD_DATA(R,S,u,t,E0,E1,tmp) \
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t=R^(R>>16L); \
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u=t&E0; t&=E1; \
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tmp=(u<<16); u^=R^s[S ]; u^=tmp; \
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tmp=(t<<16); t^=R^s[S+1]; t^=tmp
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#else
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#define LOAD_DATA_tmp(a,b,c,d,e,f) LOAD_DATA(a,b,c,d,e,f,g)
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#define LOAD_DATA(R,S,u,t,E0,E1,tmp) \
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u=R^s[S ]; \
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t=R^s[S+1]
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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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/* It recently occured to me that 0^0^0^0^0^0^0 == 0, so there
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* is no reason to not xor all the sub items together. This potentially
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* saves a register since things can be xored directly into L */
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#if defined(DES_RISC1) || defined(DES_RISC2)
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#ifdef DES_RISC1
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#define D_ENCRYPT(LL,R,S) { \
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unsigned int u1,u2,u3; \
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LOAD_DATA(R,S,u,t,E0,E1,u1); \
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u2=(int)u>>8L; \
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u1=(int)u&0xfc; \
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u2&=0xfc; \
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t=ROTATE(t,4); \
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u>>=16L; \
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LL^= *(const DES_LONG *)(des_SP +u1); \
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LL^= *(const DES_LONG *)(des_SP+0x200+u2); \
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u3=(int)(u>>8L); \
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u1=(int)u&0xfc; \
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u3&=0xfc; \
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LL^= *(const DES_LONG *)(des_SP+0x400+u1); \
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LL^= *(const DES_LONG *)(des_SP+0x600+u3); \
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u2=(int)t>>8L; \
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u1=(int)t&0xfc; \
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u2&=0xfc; \
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t>>=16L; \
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LL^= *(const DES_LONG *)(des_SP+0x100+u1); \
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LL^= *(const DES_LONG *)(des_SP+0x300+u2); \
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u3=(int)t>>8L; \
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u1=(int)t&0xfc; \
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u3&=0xfc; \
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LL^= *(const DES_LONG *)(des_SP+0x500+u1); \
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LL^= *(const DES_LONG *)(des_SP+0x700+u3); }
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#endif
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#ifdef DES_RISC2
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#define D_ENCRYPT(LL,R,S) { \
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unsigned int u1,u2,s1,s2; \
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LOAD_DATA(R,S,u,t,E0,E1,u1); \
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u2=(int)u>>8L; \
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u1=(int)u&0xfc; \
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u2&=0xfc; \
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t=ROTATE(t,4); \
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LL^= *(const DES_LONG *)(des_SP +u1); \
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LL^= *(const DES_LONG *)(des_SP+0x200+u2); \
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s1=(int)(u>>16L); \
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s2=(int)(u>>24L); \
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s1&=0xfc; \
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s2&=0xfc; \
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LL^= *(const DES_LONG *)(des_SP+0x400+s1); \
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LL^= *(const DES_LONG *)(des_SP+0x600+s2); \
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u2=(int)t>>8L; \
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u1=(int)t&0xfc; \
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u2&=0xfc; \
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LL^= *(const DES_LONG *)(des_SP+0x100+u1); \
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LL^= *(const DES_LONG *)(des_SP+0x300+u2); \
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s1=(int)(t>>16L); \
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s2=(int)(t>>24L); \
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s1&=0xfc; \
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s2&=0xfc; \
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LL^= *(const DES_LONG *)(des_SP+0x500+s1); \
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LL^= *(const DES_LONG *)(des_SP+0x700+s2); }
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#endif
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#else
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#define D_ENCRYPT(LL,R,S) { \
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LOAD_DATA_tmp(R,S,u,t,E0,E1); \
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t=ROTATE(t,4); \
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LL^= \
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*(const DES_LONG *)(des_SP +((u )&0xfc))^ \
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*(const DES_LONG *)(des_SP+0x200+((u>> 8L)&0xfc))^ \
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*(const DES_LONG *)(des_SP+0x400+((u>>16L)&0xfc))^ \
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*(const DES_LONG *)(des_SP+0x600+((u>>24L)&0xfc))^ \
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*(const DES_LONG *)(des_SP+0x100+((t )&0xfc))^ \
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*(const DES_LONG *)(des_SP+0x300+((t>> 8L)&0xfc))^ \
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*(const DES_LONG *)(des_SP+0x500+((t>>16L)&0xfc))^ \
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*(const DES_LONG *)(des_SP+0x700+((t>>24L)&0xfc)); }
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#endif
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#else /* original version */
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#if defined(DES_RISC1) || defined(DES_RISC2)
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#ifdef DES_RISC1
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#define D_ENCRYPT(LL,R,S) {\
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unsigned int u1,u2,u3; \
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LOAD_DATA(R,S,u,t,E0,E1,u1); \
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u>>=2L; \
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t=ROTATE(t,6); \
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u2=(int)u>>8L; \
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u1=(int)u&0x3f; \
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u2&=0x3f; \
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u>>=16L; \
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LL^=des_SPtrans[0][u1]; \
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LL^=des_SPtrans[2][u2]; \
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u3=(int)u>>8L; \
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u1=(int)u&0x3f; \
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u3&=0x3f; \
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LL^=des_SPtrans[4][u1]; \
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LL^=des_SPtrans[6][u3]; \
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u2=(int)t>>8L; \
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u1=(int)t&0x3f; \
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u2&=0x3f; \
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t>>=16L; \
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LL^=des_SPtrans[1][u1]; \
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LL^=des_SPtrans[3][u2]; \
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u3=(int)t>>8L; \
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u1=(int)t&0x3f; \
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u3&=0x3f; \
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LL^=des_SPtrans[5][u1]; \
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LL^=des_SPtrans[7][u3]; }
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#endif
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#ifdef DES_RISC2
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#define D_ENCRYPT(LL,R,S) {\
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unsigned int u1,u2,s1,s2; \
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LOAD_DATA(R,S,u,t,E0,E1,u1); \
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u>>=2L; \
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t=ROTATE(t,6); \
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u2=(int)u>>8L; \
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u1=(int)u&0x3f; \
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u2&=0x3f; \
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LL^=des_SPtrans[0][u1]; \
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LL^=des_SPtrans[2][u2]; \
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s1=(int)u>>16L; \
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s2=(int)u>>24L; \
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s1&=0x3f; \
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s2&=0x3f; \
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LL^=des_SPtrans[4][s1]; \
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LL^=des_SPtrans[6][s2]; \
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u2=(int)t>>8L; \
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u1=(int)t&0x3f; \
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u2&=0x3f; \
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LL^=des_SPtrans[1][u1]; \
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LL^=des_SPtrans[3][u2]; \
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s1=(int)t>>16; \
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s2=(int)t>>24L; \
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s1&=0x3f; \
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s2&=0x3f; \
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LL^=des_SPtrans[5][s1]; \
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LL^=des_SPtrans[7][s2]; }
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#endif
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#else
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#define D_ENCRYPT(LL,R,S) {\
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LOAD_DATA_tmp(R,S,u,t,E0,E1); \
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t=ROTATE(t,4); \
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LL^=\
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des_SPtrans[0][(u>> 2L)&0x3f]^ \
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des_SPtrans[2][(u>>10L)&0x3f]^ \
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des_SPtrans[4][(u>>18L)&0x3f]^ \
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des_SPtrans[6][(u>>26L)&0x3f]^ \
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des_SPtrans[1][(t>> 2L)&0x3f]^ \
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des_SPtrans[3][(t>>10L)&0x3f]^ \
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des_SPtrans[5][(t>>18L)&0x3f]^ \
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des_SPtrans[7][(t>>26L)&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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extern const DES_LONG des_SPtrans[8][64];
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void fcrypt_body(DES_LONG *out,des_key_schedule ks,
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DES_LONG Eswap0, DES_LONG Eswap1);
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#endif
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