1/* 2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10#ifndef OSSL_CRYPTO_DES_LOCAL_H 11# define OSSL_CRYPTO_DES_LOCAL_H 12 13# include <openssl/e_os2.h> 14 15# include <stdio.h> 16# include <stdlib.h> 17# include <string.h> 18 19# include <openssl/des.h> 20 21# ifdef OPENSSL_BUILD_SHLIBCRYPTO 22# undef OPENSSL_EXTERN 23# define OPENSSL_EXTERN OPENSSL_EXPORT 24# endif 25 26# define ITERATIONS 16 27# define HALF_ITERATIONS 8 28 29# define c2l(c,l) (l =((DES_LONG)(*((c)++))) , \ 30 l|=((DES_LONG)(*((c)++)))<< 8L, \ 31 l|=((DES_LONG)(*((c)++)))<<16L, \ 32 l|=((DES_LONG)(*((c)++)))<<24L) 33 34/* NOTE - c is not incremented as per c2l */ 35# define c2ln(c,l1,l2,n) { \ 36 c+=n; \ 37 l1=l2=0; \ 38 switch (n) { \ 39 case 8: l2 =((DES_LONG)(*(--(c))))<<24L; \ 40 /* fall thru */ \ 41 case 7: l2|=((DES_LONG)(*(--(c))))<<16L; \ 42 /* fall thru */ \ 43 case 6: l2|=((DES_LONG)(*(--(c))))<< 8L; \ 44 /* fall thru */ \ 45 case 5: l2|=((DES_LONG)(*(--(c)))); \ 46 /* fall thru */ \ 47 case 4: l1 =((DES_LONG)(*(--(c))))<<24L; \ 48 /* fall thru */ \ 49 case 3: l1|=((DES_LONG)(*(--(c))))<<16L; \ 50 /* fall thru */ \ 51 case 2: l1|=((DES_LONG)(*(--(c))))<< 8L; \ 52 /* fall thru */ \ 53 case 1: l1|=((DES_LONG)(*(--(c)))); \ 54 } \ 55 } 56 57# define l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \ 58 *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \ 59 *((c)++)=(unsigned char)(((l)>>16L)&0xff), \ 60 *((c)++)=(unsigned char)(((l)>>24L)&0xff)) 61 62/* 63 * replacements for htonl and ntohl since I have no idea what to do when 64 * faced with machines with 8 byte longs. 65 */ 66 67# define n2l(c,l) (l =((DES_LONG)(*((c)++)))<<24L, \ 68 l|=((DES_LONG)(*((c)++)))<<16L, \ 69 l|=((DES_LONG)(*((c)++)))<< 8L, \ 70 l|=((DES_LONG)(*((c)++)))) 71 72# define l2n(l,c) (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \ 73 *((c)++)=(unsigned char)(((l)>>16L)&0xff), \ 74 *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \ 75 *((c)++)=(unsigned char)(((l) )&0xff)) 76 77/* NOTE - c is not incremented as per l2c */ 78# define l2cn(l1,l2,c,n) { \ 79 c+=n; \ 80 switch (n) { \ 81 case 8: *(--(c))=(unsigned char)(((l2)>>24L)&0xff); \ 82 /* fall thru */ \ 83 case 7: *(--(c))=(unsigned char)(((l2)>>16L)&0xff); \ 84 /* fall thru */ \ 85 case 6: *(--(c))=(unsigned char)(((l2)>> 8L)&0xff); \ 86 /* fall thru */ \ 87 case 5: *(--(c))=(unsigned char)(((l2) )&0xff); \ 88 /* fall thru */ \ 89 case 4: *(--(c))=(unsigned char)(((l1)>>24L)&0xff); \ 90 /* fall thru */ \ 91 case 3: *(--(c))=(unsigned char)(((l1)>>16L)&0xff); \ 92 /* fall thru */ \ 93 case 2: *(--(c))=(unsigned char)(((l1)>> 8L)&0xff); \ 94 /* fall thru */ \ 95 case 1: *(--(c))=(unsigned char)(((l1) )&0xff); \ 96 } \ 97 } 98 99# if defined(_MSC_VER) 100# define ROTATE(a,n) (_lrotr(a,n)) 101# elif defined(__ICC) 102# define ROTATE(a,n) (_rotr(a,n)) 103# elif defined(__GNUC__) && __GNUC__>=2 && !defined(__STRICT_ANSI__) && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM) && !defined(PEDANTIC) 104# if defined(__i386) || defined(__i386__) || defined(__x86_64) || defined(__x86_64__) 105# define ROTATE(a,n) ({ register unsigned int ret; \ 106 asm ("rorl %1,%0" \ 107 : "=r"(ret) \ 108 : "I"(n),"0"(a) \ 109 : "cc"); \ 110 ret; \ 111 }) 112# endif 113# endif 114# ifndef ROTATE 115# define ROTATE(a,n) (((a)>>(n))+((a)<<(32-(n)))) 116# endif 117 118/* 119 * Don't worry about the LOAD_DATA() stuff, that is used by fcrypt() to add 120 * it's little bit to the front 121 */ 122 123# ifdef DES_FCRYPT 124 125# define LOAD_DATA_tmp(R,S,u,t,E0,E1) \ 126 { DES_LONG tmp; LOAD_DATA(R,S,u,t,E0,E1,tmp); } 127 128# define LOAD_DATA(R,S,u,t,E0,E1,tmp) \ 129 t=R^(R>>16L); \ 130 u=t&E0; t&=E1; \ 131 tmp=(u<<16); u^=R^s[S ]; u^=tmp; \ 132 tmp=(t<<16); t^=R^s[S+1]; t^=tmp 133# else 134# define LOAD_DATA_tmp(a,b,c,d,e,f) LOAD_DATA(a,b,c,d,e,f,g) 135# define LOAD_DATA(R,S,u,t,E0,E1,tmp) \ 136 u=R^s[S ]; \ 137 t=R^s[S+1] 138# endif 139 140/* 141 * It recently occurred to me that 0^0^0^0^0^0^0 == 0, so there is no reason 142 * to not xor all the sub items together. This potentially saves a register 143 * since things can be xored directly into L 144 */ 145 146# define D_ENCRYPT(LL,R,S) { \ 147 LOAD_DATA_tmp(R,S,u,t,E0,E1); \ 148 t=ROTATE(t,4); \ 149 LL^= \ 150 DES_SPtrans[0][(u>> 2L)&0x3f]^ \ 151 DES_SPtrans[2][(u>>10L)&0x3f]^ \ 152 DES_SPtrans[4][(u>>18L)&0x3f]^ \ 153 DES_SPtrans[6][(u>>26L)&0x3f]^ \ 154 DES_SPtrans[1][(t>> 2L)&0x3f]^ \ 155 DES_SPtrans[3][(t>>10L)&0x3f]^ \ 156 DES_SPtrans[5][(t>>18L)&0x3f]^ \ 157 DES_SPtrans[7][(t>>26L)&0x3f]; } 158 159 /*- 160 * IP and FP 161 * The problem is more of a geometric problem that random bit fiddling. 162 0 1 2 3 4 5 6 7 62 54 46 38 30 22 14 6 163 8 9 10 11 12 13 14 15 60 52 44 36 28 20 12 4 164 16 17 18 19 20 21 22 23 58 50 42 34 26 18 10 2 165 24 25 26 27 28 29 30 31 to 56 48 40 32 24 16 8 0 166 167 32 33 34 35 36 37 38 39 63 55 47 39 31 23 15 7 168 40 41 42 43 44 45 46 47 61 53 45 37 29 21 13 5 169 48 49 50 51 52 53 54 55 59 51 43 35 27 19 11 3 170 56 57 58 59 60 61 62 63 57 49 41 33 25 17 9 1 171 172 The output has been subject to swaps of the form 173 0 1 -> 3 1 but the odd and even bits have been put into 174 2 3 2 0 175 different words. The main trick is to remember that 176 t=((l>>size)^r)&(mask); 177 r^=t; 178 l^=(t<<size); 179 can be used to swap and move bits between words. 180 181 So l = 0 1 2 3 r = 16 17 18 19 182 4 5 6 7 20 21 22 23 183 8 9 10 11 24 25 26 27 184 12 13 14 15 28 29 30 31 185 becomes (for size == 2 and mask == 0x3333) 186 t = 2^16 3^17 -- -- l = 0 1 16 17 r = 2 3 18 19 187 6^20 7^21 -- -- 4 5 20 21 6 7 22 23 188 10^24 11^25 -- -- 8 9 24 25 10 11 24 25 189 14^28 15^29 -- -- 12 13 28 29 14 15 28 29 190 191 Thanks for hints from Richard Outerbridge - he told me IP&FP 192 could be done in 15 xor, 10 shifts and 5 ands. 193 When I finally started to think of the problem in 2D 194 I first got ~42 operations without xors. When I remembered 195 how to use xors :-) I got it to its final state. 196 */ 197# define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\ 198 (b)^=(t),\ 199 (a)^=((t)<<(n))) 200 201# define IP(l,r) \ 202 { \ 203 register DES_LONG tt; \ 204 PERM_OP(r,l,tt, 4,0x0f0f0f0fL); \ 205 PERM_OP(l,r,tt,16,0x0000ffffL); \ 206 PERM_OP(r,l,tt, 2,0x33333333L); \ 207 PERM_OP(l,r,tt, 8,0x00ff00ffL); \ 208 PERM_OP(r,l,tt, 1,0x55555555L); \ 209 } 210 211# define FP(l,r) \ 212 { \ 213 register DES_LONG tt; \ 214 PERM_OP(l,r,tt, 1,0x55555555L); \ 215 PERM_OP(r,l,tt, 8,0x00ff00ffL); \ 216 PERM_OP(l,r,tt, 2,0x33333333L); \ 217 PERM_OP(r,l,tt,16,0x0000ffffL); \ 218 PERM_OP(l,r,tt, 4,0x0f0f0f0fL); \ 219 } 220 221extern const DES_LONG DES_SPtrans[8][64]; 222 223void fcrypt_body(DES_LONG *out, DES_key_schedule *ks, 224 DES_LONG Eswap0, DES_LONG Eswap1); 225 226#endif 227