| /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| * All rights reserved. |
| * |
| * This package is an SSL implementation written |
| * by Eric Young (eay@cryptsoft.com). |
| * The implementation was written so as to conform with Netscapes SSL. |
| * |
| * This library is free for commercial and non-commercial use as long as |
| * the following conditions are aheared to. The following conditions |
| * apply to all code found in this distribution, be it the RC4, RSA, |
| * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| * included with this distribution is covered by the same copyright terms |
| * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| * |
| * Copyright remains Eric Young's, and as such any Copyright notices in |
| * the code are not to be removed. |
| * If this package is used in a product, Eric Young should be given attribution |
| * as the author of the parts of the library 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 cryptographic software written by |
| * Eric Young (eay@cryptsoft.com)" |
| * The word 'cryptographic' can be left out if the rouines from the library |
| * being used are not cryptographic related :-). |
| * 4. If you include any Windows specific code (or a derivative thereof) from |
| * the apps directory (application code) you must include an acknowledgement: |
| * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| * |
| * 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.] */ |
| |
| #ifndef OPENSSL_HEADER_DES_INTERNAL_H |
| #define OPENSSL_HEADER_DES_INTERNAL_H |
| |
| #include <openssl/base.h> |
| |
| #if defined(__cplusplus) |
| extern "C" { |
| #endif |
| |
| |
| #define c2l(c, l) \ |
| do { \ |
| (l) = ((uint32_t)(*((c)++))); \ |
| (l) |= ((uint32_t)(*((c)++))) << 8L; \ |
| (l) |= ((uint32_t)(*((c)++))) << 16L; \ |
| (l) |= ((uint32_t)(*((c)++))) << 24L; \ |
| } while (0) |
| |
| #define l2c(l, c) \ |
| do { \ |
| *((c)++) = (unsigned char)(((l)) & 0xff); \ |
| *((c)++) = (unsigned char)(((l) >> 8L) & 0xff); \ |
| *((c)++) = (unsigned char)(((l) >> 16L) & 0xff); \ |
| *((c)++) = (unsigned char)(((l) >> 24L) & 0xff); \ |
| } while (0) |
| |
| /* NOTE - c is not incremented as per c2l */ |
| #define c2ln(c, l1, l2, n) \ |
| do { \ |
| (c) += (n); \ |
| (l1) = (l2) = 0; \ |
| switch (n) { \ |
| case 8: \ |
| (l2) = ((uint32_t)(*(--(c)))) << 24L; \ |
| case 7: \ |
| (l2) |= ((uint32_t)(*(--(c)))) << 16L; \ |
| case 6: \ |
| (l2) |= ((uint32_t)(*(--(c)))) << 8L; \ |
| case 5: \ |
| (l2) |= ((uint32_t)(*(--(c)))); \ |
| case 4: \ |
| (l1) = ((uint32_t)(*(--(c)))) << 24L; \ |
| case 3: \ |
| (l1) |= ((uint32_t)(*(--(c)))) << 16L; \ |
| case 2: \ |
| (l1) |= ((uint32_t)(*(--(c)))) << 8L; \ |
| case 1: \ |
| (l1) |= ((uint32_t)(*(--(c)))); \ |
| } \ |
| } while (0) |
| |
| /* NOTE - c is not incremented as per l2c */ |
| #define l2cn(l1, l2, c, n) \ |
| do { \ |
| (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); \ |
| } \ |
| } while (0) |
| |
| /* 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) \ |
| do { \ |
| (t) = ((((a) >> (n)) ^ (b)) & (m)); \ |
| (b) ^= (t); \ |
| (a) ^= ((t) << (n)); \ |
| } while (0) |
| |
| #define IP(l, r) \ |
| do { \ |
| uint32_t 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); \ |
| } while (0) |
| |
| #define FP(l, r) \ |
| do { \ |
| uint32_t 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); \ |
| } while (0) |
| |
| #define LOAD_DATA(ks, R, S, u, t, E0, E1) \ |
| do { \ |
| (u) = (R) ^ (ks)->subkeys[S][0]; \ |
| (t) = (R) ^ (ks)->subkeys[S][1]; \ |
| } while (0) |
| |
| #define D_ENCRYPT(ks, LL, R, S) \ |
| do { \ |
| LOAD_DATA(ks, R, S, u, t, E0, E1); \ |
| t = ROTATE(t, 4); \ |
| (LL) ^= \ |
| DES_SPtrans[0][(u >> 2L) & 0x3f] ^ DES_SPtrans[2][(u >> 10L) & 0x3f] ^ \ |
| DES_SPtrans[4][(u >> 18L) & 0x3f] ^ \ |
| DES_SPtrans[6][(u >> 26L) & 0x3f] ^ DES_SPtrans[1][(t >> 2L) & 0x3f] ^ \ |
| DES_SPtrans[3][(t >> 10L) & 0x3f] ^ \ |
| DES_SPtrans[5][(t >> 18L) & 0x3f] ^ DES_SPtrans[7][(t >> 26L) & 0x3f]; \ |
| } while (0) |
| |
| #define ITERATIONS 16 |
| #define HALF_ITERATIONS 8 |
| |
| #define ROTATE(a, n) (((a) >> (n)) + ((a) << (32 - (n)))) |
| |
| |
| #if defined(__cplusplus) |
| } /* extern C */ |
| #endif |
| |
| #endif /* OPENSSL_HEADER_DES_INTERNAL_H */ |
