1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay@cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay@cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57#ifndef OPENSSL_HEADER_DES_INTERNAL_H 58#define OPENSSL_HEADER_DES_INTERNAL_H 59 60#include <openssl/base.h> 61 62#include "../../internal.h" 63 64#if defined(__cplusplus) 65extern "C" { 66#endif 67 68 69#define c2l(c, l) \ 70 do { \ 71 (l) = ((uint32_t)(*((c)++))); \ 72 (l) |= ((uint32_t)(*((c)++))) << 8L; \ 73 (l) |= ((uint32_t)(*((c)++))) << 16L; \ 74 (l) |= ((uint32_t)(*((c)++))) << 24L; \ 75 } while (0) 76 77#define l2c(l, c) \ 78 do { \ 79 *((c)++) = (unsigned char)(((l)) & 0xff); \ 80 *((c)++) = (unsigned char)(((l) >> 8L) & 0xff); \ 81 *((c)++) = (unsigned char)(((l) >> 16L) & 0xff); \ 82 *((c)++) = (unsigned char)(((l) >> 24L) & 0xff); \ 83 } while (0) 84 85// NOTE - c is not incremented as per c2l 86#define c2ln(c, l1, l2, n) \ 87 do { \ 88 (c) += (n); \ 89 (l1) = (l2) = 0; \ 90 switch (n) { \ 91 case 8: \ 92 (l2) = ((uint32_t)(*(--(c)))) << 24L; \ 93 OPENSSL_FALLTHROUGH; \ 94 case 7: \ 95 (l2) |= ((uint32_t)(*(--(c)))) << 16L; \ 96 OPENSSL_FALLTHROUGH; \ 97 case 6: \ 98 (l2) |= ((uint32_t)(*(--(c)))) << 8L; \ 99 OPENSSL_FALLTHROUGH; \ 100 case 5: \ 101 (l2) |= ((uint32_t)(*(--(c)))); \ 102 OPENSSL_FALLTHROUGH; \ 103 case 4: \ 104 (l1) = ((uint32_t)(*(--(c)))) << 24L; \ 105 OPENSSL_FALLTHROUGH; \ 106 case 3: \ 107 (l1) |= ((uint32_t)(*(--(c)))) << 16L; \ 108 OPENSSL_FALLTHROUGH; \ 109 case 2: \ 110 (l1) |= ((uint32_t)(*(--(c)))) << 8L; \ 111 OPENSSL_FALLTHROUGH; \ 112 case 1: \ 113 (l1) |= ((uint32_t)(*(--(c)))); \ 114 } \ 115 } while (0) 116 117// NOTE - c is not incremented as per l2c 118#define l2cn(l1, l2, c, n) \ 119 do { \ 120 (c) += (n); \ 121 switch (n) { \ 122 case 8: \ 123 *(--(c)) = (unsigned char)(((l2) >> 24L) & 0xff); \ 124 OPENSSL_FALLTHROUGH; \ 125 case 7: \ 126 *(--(c)) = (unsigned char)(((l2) >> 16L) & 0xff); \ 127 OPENSSL_FALLTHROUGH; \ 128 case 6: \ 129 *(--(c)) = (unsigned char)(((l2) >> 8L) & 0xff); \ 130 OPENSSL_FALLTHROUGH; \ 131 case 5: \ 132 *(--(c)) = (unsigned char)(((l2)) & 0xff); \ 133 OPENSSL_FALLTHROUGH; \ 134 case 4: \ 135 *(--(c)) = (unsigned char)(((l1) >> 24L) & 0xff); \ 136 OPENSSL_FALLTHROUGH; \ 137 case 3: \ 138 *(--(c)) = (unsigned char)(((l1) >> 16L) & 0xff); \ 139 OPENSSL_FALLTHROUGH; \ 140 case 2: \ 141 *(--(c)) = (unsigned char)(((l1) >> 8L) & 0xff); \ 142 OPENSSL_FALLTHROUGH; \ 143 case 1: \ 144 *(--(c)) = (unsigned char)(((l1)) & 0xff); \ 145 } \ 146 } while (0) 147 148/* IP and FP 149 * The problem is more of a geometric problem that random bit fiddling. 150 0 1 2 3 4 5 6 7 62 54 46 38 30 22 14 6 151 8 9 10 11 12 13 14 15 60 52 44 36 28 20 12 4 15216 17 18 19 20 21 22 23 58 50 42 34 26 18 10 2 15324 25 26 27 28 29 30 31 to 56 48 40 32 24 16 8 0 154 15532 33 34 35 36 37 38 39 63 55 47 39 31 23 15 7 15640 41 42 43 44 45 46 47 61 53 45 37 29 21 13 5 15748 49 50 51 52 53 54 55 59 51 43 35 27 19 11 3 15856 57 58 59 60 61 62 63 57 49 41 33 25 17 9 1 159 160The output has been subject to swaps of the form 1610 1 -> 3 1 but the odd and even bits have been put into 1622 3 2 0 163different words. The main trick is to remember that 164t=((l>>size)^r)&(mask); 165r^=t; 166l^=(t<<size); 167can be used to swap and move bits between words. 168 169So l = 0 1 2 3 r = 16 17 18 19 170 4 5 6 7 20 21 22 23 171 8 9 10 11 24 25 26 27 172 12 13 14 15 28 29 30 31 173becomes (for size == 2 and mask == 0x3333) 174 t = 2^16 3^17 -- -- l = 0 1 16 17 r = 2 3 18 19 175 6^20 7^21 -- -- 4 5 20 21 6 7 22 23 176 10^24 11^25 -- -- 8 9 24 25 10 11 24 25 177 14^28 15^29 -- -- 12 13 28 29 14 15 28 29 178 179Thanks for hints from Richard Outerbridge - he told me IP&FP 180could be done in 15 xor, 10 shifts and 5 ands. 181When I finally started to think of the problem in 2D 182I first got ~42 operations without xors. When I remembered 183how to use xors :-) I got it to its final state. 184*/ 185#define PERM_OP(a, b, t, n, m) \ 186 do { \ 187 (t) = ((((a) >> (n)) ^ (b)) & (m)); \ 188 (b) ^= (t); \ 189 (a) ^= ((t) << (n)); \ 190 } while (0) 191 192#define IP(l, r) \ 193 do { \ 194 uint32_t tt; \ 195 PERM_OP(r, l, tt, 4, 0x0f0f0f0fL); \ 196 PERM_OP(l, r, tt, 16, 0x0000ffffL); \ 197 PERM_OP(r, l, tt, 2, 0x33333333L); \ 198 PERM_OP(l, r, tt, 8, 0x00ff00ffL); \ 199 PERM_OP(r, l, tt, 1, 0x55555555L); \ 200 } while (0) 201 202#define FP(l, r) \ 203 do { \ 204 uint32_t tt; \ 205 PERM_OP(l, r, tt, 1, 0x55555555L); \ 206 PERM_OP(r, l, tt, 8, 0x00ff00ffL); \ 207 PERM_OP(l, r, tt, 2, 0x33333333L); \ 208 PERM_OP(r, l, tt, 16, 0x0000ffffL); \ 209 PERM_OP(l, r, tt, 4, 0x0f0f0f0fL); \ 210 } while (0) 211 212#define LOAD_DATA(ks, R, S, u, t, E0, E1) \ 213 do { \ 214 (u) = (R) ^ (ks)->subkeys[S][0]; \ 215 (t) = (R) ^ (ks)->subkeys[S][1]; \ 216 } while (0) 217 218#define D_ENCRYPT(ks, LL, R, S) \ 219 do { \ 220 LOAD_DATA(ks, R, S, u, t, E0, E1); \ 221 t = ROTATE(t, 4); \ 222 (LL) ^= \ 223 DES_SPtrans[0][(u >> 2L) & 0x3f] ^ DES_SPtrans[2][(u >> 10L) & 0x3f] ^ \ 224 DES_SPtrans[4][(u >> 18L) & 0x3f] ^ \ 225 DES_SPtrans[6][(u >> 26L) & 0x3f] ^ DES_SPtrans[1][(t >> 2L) & 0x3f] ^ \ 226 DES_SPtrans[3][(t >> 10L) & 0x3f] ^ \ 227 DES_SPtrans[5][(t >> 18L) & 0x3f] ^ DES_SPtrans[7][(t >> 26L) & 0x3f]; \ 228 } while (0) 229 230#define ITERATIONS 16 231#define HALF_ITERATIONS 8 232 233#define ROTATE(a, n) (((a) >> (n)) + ((a) << (32 - (n)))) 234 235 236#if defined(__cplusplus) 237} // extern C 238#endif 239 240#endif // OPENSSL_HEADER_DES_INTERNAL_H 241