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