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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
118static inline uint32_t
119ROTATE(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
218extern 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
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