1 /* $OpenBSD: des_local.h,v 1.5 2024/08/31 16:22:18 jsing Exp $ */ 2 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #ifndef HEADER_DES_LOCL_H 60 #define HEADER_DES_LOCL_H 61 62 #include <math.h> 63 #include <stdint.h> 64 #include <stdio.h> 65 #include <stdlib.h> 66 #include <string.h> 67 #include <unistd.h> 68 69 #include <openssl/opensslconf.h> 70 71 #include <openssl/des.h> 72 73 __BEGIN_HIDDEN_DECLS 74 75 #define ITERATIONS 16 76 77 #define c2l(c,l) (l =((DES_LONG)(*((c)++))) , \ 78 l|=((DES_LONG)(*((c)++)))<< 8L, \ 79 l|=((DES_LONG)(*((c)++)))<<16L, \ 80 l|=((DES_LONG)(*((c)++)))<<24L) 81 82 /* NOTE - c is not incremented as per c2l */ 83 #define c2ln(c,l1,l2,n) { \ 84 c+=n; \ 85 l1=l2=0; \ 86 switch (n) { \ 87 case 8: l2 =((DES_LONG)(*(--(c))))<<24L; \ 88 case 7: l2|=((DES_LONG)(*(--(c))))<<16L; \ 89 case 6: l2|=((DES_LONG)(*(--(c))))<< 8L; \ 90 case 5: l2|=((DES_LONG)(*(--(c)))); \ 91 case 4: l1 =((DES_LONG)(*(--(c))))<<24L; \ 92 case 3: l1|=((DES_LONG)(*(--(c))))<<16L; \ 93 case 2: l1|=((DES_LONG)(*(--(c))))<< 8L; \ 94 case 1: l1|=((DES_LONG)(*(--(c)))); \ 95 } \ 96 } 97 98 #define l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \ 99 *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \ 100 *((c)++)=(unsigned char)(((l)>>16L)&0xff), \ 101 *((c)++)=(unsigned char)(((l)>>24L)&0xff)) 102 103 /* NOTE - c is not incremented as per l2c */ 104 #define l2cn(l1,l2,c,n) { \ 105 c+=n; \ 106 switch (n) { \ 107 case 8: *(--(c))=(unsigned char)(((l2)>>24L)&0xff);\ 108 case 7: *(--(c))=(unsigned char)(((l2)>>16L)&0xff);\ 109 case 6: *(--(c))=(unsigned char)(((l2)>> 8L)&0xff);\ 110 case 5: *(--(c))=(unsigned char)(((l2) )&0xff);\ 111 case 4: *(--(c))=(unsigned char)(((l1)>>24L)&0xff);\ 112 case 3: *(--(c))=(unsigned char)(((l1)>>16L)&0xff);\ 113 case 2: *(--(c))=(unsigned char)(((l1)>> 8L)&0xff);\ 114 case 1: *(--(c))=(unsigned char)(((l1) )&0xff);\ 115 } \ 116 } 117 118 static inline uint32_t 119 ROTATE(uint32_t a, uint32_t n) 120 { 121 return (a >> n) + (a << (32 - n)); 122 } 123 124 /* Don't worry about the LOAD_DATA() stuff, that is used by 125 * fcrypt() to add it's little bit to the front */ 126 127 #ifdef DES_FCRYPT 128 129 #define LOAD_DATA_tmp(R,S,u,t,E0,E1) \ 130 { DES_LONG tmp; LOAD_DATA(R,S,u,t,E0,E1,tmp); } 131 132 #define LOAD_DATA(R,S,u,t,E0,E1,tmp) \ 133 t=R^(R>>16L); \ 134 u=t&E0; t&=E1; \ 135 tmp=(u<<16); u^=R^s[S ]; u^=tmp; \ 136 tmp=(t<<16); t^=R^s[S+1]; t^=tmp 137 #else 138 #define LOAD_DATA_tmp(a,b,c,d,e,f) LOAD_DATA(a,b,c,d,e,f,g) 139 #define LOAD_DATA(R,S,u,t,E0,E1,tmp) \ 140 u=R^s[S ]; \ 141 t=R^s[S+1] 142 #endif 143 144 #define D_ENCRYPT(LL,R,S) { \ 145 LOAD_DATA_tmp(R,S,u,t,E0,E1); \ 146 t=ROTATE(t,4); \ 147 LL^= \ 148 DES_SPtrans[0][(u>> 2L)&0x3f]^ \ 149 DES_SPtrans[2][(u>>10L)&0x3f]^ \ 150 DES_SPtrans[4][(u>>18L)&0x3f]^ \ 151 DES_SPtrans[6][(u>>26L)&0x3f]^ \ 152 DES_SPtrans[1][(t>> 2L)&0x3f]^ \ 153 DES_SPtrans[3][(t>>10L)&0x3f]^ \ 154 DES_SPtrans[5][(t>>18L)&0x3f]^ \ 155 DES_SPtrans[7][(t>>26L)&0x3f]; } 156 157 /* IP and FP 158 * The problem is more of a geometric problem that random bit fiddling. 159 0 1 2 3 4 5 6 7 62 54 46 38 30 22 14 6 160 8 9 10 11 12 13 14 15 60 52 44 36 28 20 12 4 161 16 17 18 19 20 21 22 23 58 50 42 34 26 18 10 2 162 24 25 26 27 28 29 30 31 to 56 48 40 32 24 16 8 0 163 164 32 33 34 35 36 37 38 39 63 55 47 39 31 23 15 7 165 40 41 42 43 44 45 46 47 61 53 45 37 29 21 13 5 166 48 49 50 51 52 53 54 55 59 51 43 35 27 19 11 3 167 56 57 58 59 60 61 62 63 57 49 41 33 25 17 9 1 168 169 The output has been subject to swaps of the form 170 0 1 -> 3 1 but the odd and even bits have been put into 171 2 3 2 0 172 different words. The main trick is to remember that 173 t=((l>>size)^r)&(mask); 174 r^=t; 175 l^=(t<<size); 176 can be used to swap and move bits between words. 177 178 So l = 0 1 2 3 r = 16 17 18 19 179 4 5 6 7 20 21 22 23 180 8 9 10 11 24 25 26 27 181 12 13 14 15 28 29 30 31 182 becomes (for size == 2 and mask == 0x3333) 183 t = 2^16 3^17 -- -- l = 0 1 16 17 r = 2 3 18 19 184 6^20 7^21 -- -- 4 5 20 21 6 7 22 23 185 10^24 11^25 -- -- 8 9 24 25 10 11 24 25 186 14^28 15^29 -- -- 12 13 28 29 14 15 28 29 187 188 Thanks for hints from Richard Outerbridge - he told me IP&FP 189 could be done in 15 xor, 10 shifts and 5 ands. 190 When I finally started to think of the problem in 2D 191 I first got ~42 operations without xors. When I remembered 192 how to use xors :-) I got it to its final state. 193 */ 194 #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)), \ 195 (b)^=(t), \ 196 (a)^=((t)<<(n))) 197 198 #define IP(l,r) \ 199 { \ 200 DES_LONG tt; \ 201 PERM_OP(r,l,tt, 4,0x0f0f0f0fL); \ 202 PERM_OP(l,r,tt,16,0x0000ffffL); \ 203 PERM_OP(r,l,tt, 2,0x33333333L); \ 204 PERM_OP(l,r,tt, 8,0x00ff00ffL); \ 205 PERM_OP(r,l,tt, 1,0x55555555L); \ 206 } 207 208 #define FP(l,r) \ 209 { \ 210 DES_LONG tt; \ 211 PERM_OP(l,r,tt, 1,0x55555555L); \ 212 PERM_OP(r,l,tt, 8,0x00ff00ffL); \ 213 PERM_OP(l,r,tt, 2,0x33333333L); \ 214 PERM_OP(r,l,tt,16,0x0000ffffL); \ 215 PERM_OP(l,r,tt, 4,0x0f0f0f0fL); \ 216 } 217 218 extern const DES_LONG DES_SPtrans[8][64]; 219 220 #ifdef OPENSSL_SMALL_FOOTPRINT 221 #undef DES_UNROLL 222 #endif 223 224 __END_HIDDEN_DECLS 225 226 #endif 227