/* $FreeBSD: src/sys/crypto/des/des_locl.h,v 1.2.2.2 2001/07/03 11:01:31 ume Exp $ */ /* $KAME: des_locl.h,v 1.6 2000/11/06 13:58:09 itojun Exp $ */ /* lib/des/des_locl.h */ /* Copyright (C) 1995-1996 Eric Young (eay@mincom.oz.au) * All rights reserved. * * This file is part of an SSL implementation written * by Eric Young (eay@mincom.oz.au). * The implementation was written so as to conform with Netscapes SSL * specification. This library and applications are * FREE FOR COMMERCIAL AND NON-COMMERCIAL USE * as long as the following conditions are aheared to. * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. If this code is used in a product, * Eric Young should be given attribution as the author of the parts 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 software developed by Eric Young (eay@mincom.oz.au) * * 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.] */ /* WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING * * Always modify des_locl.org since des_locl.h is automatically generated from * it during SSLeay configuration. * * WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING */ #ifndef HEADER_DES_LOCL_H #define HEADER_DES_LOCL_H #include <crypto/des/des.h> #undef DES_PTR #ifdef __STDC__ #undef NOPROTO #endif #define ITERATIONS 16 #define HALF_ITERATIONS 8 /* used in des_read and des_write */ #define MAXWRITE (1024*16) #define BSIZE (MAXWRITE+4) #define c2l(c,l) (l =((DES_LONG)(*((c)++))) , \ l|=((DES_LONG)(*((c)++)))<< 8L, \ l|=((DES_LONG)(*((c)++)))<<16L, \ l|=((DES_LONG)(*((c)++)))<<24L) /* NOTE - c is not incremented as per c2l */ #define c2ln(c,l1,l2,n) { \ c+=n; \ l1=l2=0; \ switch (n) { \ case 8: l2 =((DES_LONG)(*(--(c))))<<24L; \ case 7: l2|=((DES_LONG)(*(--(c))))<<16L; \ case 6: l2|=((DES_LONG)(*(--(c))))<< 8L; \ case 5: l2|=((DES_LONG)(*(--(c)))); \ case 4: l1 =((DES_LONG)(*(--(c))))<<24L; \ case 3: l1|=((DES_LONG)(*(--(c))))<<16L; \ case 2: l1|=((DES_LONG)(*(--(c))))<< 8L; \ case 1: l1|=((DES_LONG)(*(--(c)))); \ } \ } #define l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \ *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \ *((c)++)=(unsigned char)(((l)>>16L)&0xff), \ *((c)++)=(unsigned char)(((l)>>24L)&0xff)) /* replacements for htonl and ntohl since I have no idea what to do * when faced with machines with 8 byte longs. */ #define HDRSIZE 4 #define n2l(c,l) (l =((DES_LONG)(*((c)++)))<<24L, \ l|=((DES_LONG)(*((c)++)))<<16L, \ l|=((DES_LONG)(*((c)++)))<< 8L, \ l|=((DES_LONG)(*((c)++)))) #define l2n(l,c) (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \ *((c)++)=(unsigned char)(((l)>>16L)&0xff), \ *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \ *((c)++)=(unsigned char)(((l) )&0xff)) /* NOTE - c is not incremented as per l2c */ #define l2cn(l1,l2,c,n) { \ c+=n; \ switch (n) { \ case 8: *(--(c))=(unsigned char)(((l2)>>24L)&0xff); \ case 7: *(--(c))=(unsigned char)(((l2)>>16L)&0xff); \ case 6: *(--(c))=(unsigned char)(((l2)>> 8L)&0xff); \ case 5: *(--(c))=(unsigned char)(((l2) )&0xff); \ case 4: *(--(c))=(unsigned char)(((l1)>>24L)&0xff); \ case 3: *(--(c))=(unsigned char)(((l1)>>16L)&0xff); \ case 2: *(--(c))=(unsigned char)(((l1)>> 8L)&0xff); \ case 1: *(--(c))=(unsigned char)(((l1) )&0xff); \ } \ } #define ROTATE(a,n) (((a)>>(n))+((a)<<(32-(n)))) /* The changes to this macro may help or hinder, depending on the * compiler and the achitecture. gcc2 always seems to do well :-). * Inspired by Dana How <how@isl.stanford.edu> * DO NOT use the alternative version on machines with 8 byte longs. * It does not seem to work on the Alpha, even when DES_LONG is 4 * bytes, probably an issue of accessing non-word aligned objects :-( */ #ifdef DES_PTR #define D_ENCRYPT(L,R,S) { \ u=((R^s[S ])<<2); \ t= R^s[S+1]; \ t=ROTATE(t,2); \ L^= (\ *(DES_LONG *)((unsigned char *)des_SP+0x100+((t )&0xfc))+ \ *(DES_LONG *)((unsigned char *)des_SP+0x300+((t>> 8)&0xfc))+ \ *(DES_LONG *)((unsigned char *)des_SP+0x500+((t>>16)&0xfc))+ \ *(DES_LONG *)((unsigned char *)des_SP+0x700+((t>>24)&0xfc))+ \ *(DES_LONG *)((unsigned char *)des_SP +((u )&0xfc))+ \ *(DES_LONG *)((unsigned char *)des_SP+0x200+((u>> 8)&0xfc))+ \ *(DES_LONG *)((unsigned char *)des_SP+0x400+((u>>16)&0xfc))+ \ *(DES_LONG *)((unsigned char *)des_SP+0x600+((u>>24)&0xfc))); } #else /* original version */ #ifdef undef #define D_ENCRYPT(L,R,S) \ U.l=R^s[S+1]; \ T.s[0]=((U.s[0]>>4)|(U.s[1]<<12))&0x3f3f; \ T.s[1]=((U.s[1]>>4)|(U.s[0]<<12))&0x3f3f; \ U.l=(R^s[S ])&0x3f3f3f3fL; \ L^= des_SPtrans[1][(T.c[0])]| \ des_SPtrans[3][(T.c[1])]| \ des_SPtrans[5][(T.c[2])]| \ des_SPtrans[7][(T.c[3])]| \ des_SPtrans[0][(U.c[0])]| \ des_SPtrans[2][(U.c[1])]| \ des_SPtrans[4][(U.c[2])]| \ des_SPtrans[6][(U.c[3])]; #else #define D_ENCRYPT(Q,R,S) {\ u=(R^s[S ]); \ t=R^s[S+1]; \ t=ROTATE(t,4); \ Q^= des_SPtrans[1][(t )&0x3f]| \ des_SPtrans[3][(t>> 8L)&0x3f]| \ des_SPtrans[5][(t>>16L)&0x3f]| \ des_SPtrans[7][(t>>24L)&0x3f]| \ des_SPtrans[0][(u )&0x3f]| \ des_SPtrans[2][(u>> 8L)&0x3f]| \ des_SPtrans[4][(u>>16L)&0x3f]| \ des_SPtrans[6][(u>>24L)&0x3f]; } #endif #endif /* IP and FP * The problem is more of a geometric problem that random bit fiddling. 0 1 2 3 4 5 6 7 62 54 46 38 30 22 14 6 8 9 10 11 12 13 14 15 60 52 44 36 28 20 12 4 16 17 18 19 20 21 22 23 58 50 42 34 26 18 10 2 24 25 26 27 28 29 30 31 to 56 48 40 32 24 16 8 0 32 33 34 35 36 37 38 39 63 55 47 39 31 23 15 7 40 41 42 43 44 45 46 47 61 53 45 37 29 21 13 5 48 49 50 51 52 53 54 55 59 51 43 35 27 19 11 3 56 57 58 59 60 61 62 63 57 49 41 33 25 17 9 1 The output has been subject to swaps of the form 0 1 -> 3 1 but the odd and even bits have been put into 2 3 2 0 different words. The main trick is to remember that t=((l>>size)^r)&(mask); r^=t; l^=(t<<size); can be used to swap and move bits between words. So l = 0 1 2 3 r = 16 17 18 19 4 5 6 7 20 21 22 23 8 9 10 11 24 25 26 27 12 13 14 15 28 29 30 31 becomes (for size == 2 and mask == 0x3333) t = 2^16 3^17 -- -- l = 0 1 16 17 r = 2 3 18 19 6^20 7^21 -- -- 4 5 20 21 6 7 22 23 10^24 11^25 -- -- 8 9 24 25 10 11 24 25 14^28 15^29 -- -- 12 13 28 29 14 15 28 29 Thanks for hints from Richard Outerbridge - he told me IP&FP could be done in 15 xor, 10 shifts and 5 ands. When I finally started to think of the problem in 2D I first got ~42 operations without xors. When I remembered how to use xors :-) I got it to its final state. */ #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\ (b)^=(t),\ (a)^=((t)<<(n))) #define IP(l,r) \ { \ register DES_LONG tt; \ PERM_OP(r,l,tt, 4,0x0f0f0f0fL); \ PERM_OP(l,r,tt,16,0x0000ffffL); \ PERM_OP(r,l,tt, 2,0x33333333L); \ PERM_OP(l,r,tt, 8,0x00ff00ffL); \ PERM_OP(r,l,tt, 1,0x55555555L); \ } #define FP(l,r) \ { \ register DES_LONG tt; \ PERM_OP(l,r,tt, 1,0x55555555L); \ PERM_OP(r,l,tt, 8,0x00ff00ffL); \ PERM_OP(l,r,tt, 2,0x33333333L); \ PERM_OP(r,l,tt,16,0x0000ffffL); \ PERM_OP(l,r,tt, 4,0x0f0f0f0fL); \ } #endif