2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #ifndef HEADER_DES_LOCL_H
11 # define HEADER_DES_LOCL_H
13 # include <openssl/e_os2.h>
19 # include <openssl/des.h>
21 # ifdef OPENSSL_BUILD_SHLIBCRYPTO
22 # undef OPENSSL_EXTERN
23 # define OPENSSL_EXTERN OPENSSL_EXPORT
26 # define ITERATIONS 16
27 # define HALF_ITERATIONS 8
29 # define c2l(c,l) (l =((DES_LONG)(*((c)++))) , \
30 l|=((DES_LONG)(*((c)++)))<< 8L, \
31 l|=((DES_LONG)(*((c)++)))<<16L, \
32 l|=((DES_LONG)(*((c)++)))<<24L)
34 /* NOTE - c is not incremented as per c2l */
35 # define c2ln(c,l1,l2,n) { \
39 case 8: l2 =((DES_LONG)(*(--(c))))<<24L; \
40 case 7: l2|=((DES_LONG)(*(--(c))))<<16L; \
41 case 6: l2|=((DES_LONG)(*(--(c))))<< 8L; \
42 case 5: l2|=((DES_LONG)(*(--(c)))); \
43 case 4: l1 =((DES_LONG)(*(--(c))))<<24L; \
44 case 3: l1|=((DES_LONG)(*(--(c))))<<16L; \
45 case 2: l1|=((DES_LONG)(*(--(c))))<< 8L; \
46 case 1: l1|=((DES_LONG)(*(--(c)))); \
50 # define l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \
51 *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
52 *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
53 *((c)++)=(unsigned char)(((l)>>24L)&0xff))
56 * replacements for htonl and ntohl since I have no idea what to do when
57 * faced with machines with 8 byte longs.
60 # define n2l(c,l) (l =((DES_LONG)(*((c)++)))<<24L, \
61 l|=((DES_LONG)(*((c)++)))<<16L, \
62 l|=((DES_LONG)(*((c)++)))<< 8L, \
63 l|=((DES_LONG)(*((c)++))))
65 # define l2n(l,c) (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \
66 *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
67 *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
68 *((c)++)=(unsigned char)(((l) )&0xff))
70 /* NOTE - c is not incremented as per l2c */
71 # define l2cn(l1,l2,c,n) { \
74 case 8: *(--(c))=(unsigned char)(((l2)>>24L)&0xff); \
75 case 7: *(--(c))=(unsigned char)(((l2)>>16L)&0xff); \
76 case 6: *(--(c))=(unsigned char)(((l2)>> 8L)&0xff); \
77 case 5: *(--(c))=(unsigned char)(((l2) )&0xff); \
78 case 4: *(--(c))=(unsigned char)(((l1)>>24L)&0xff); \
79 case 3: *(--(c))=(unsigned char)(((l1)>>16L)&0xff); \
80 case 2: *(--(c))=(unsigned char)(((l1)>> 8L)&0xff); \
81 case 1: *(--(c))=(unsigned char)(((l1) )&0xff); \
85 # if defined(_MSC_VER)
86 # define ROTATE(a,n) (_lrotr(a,n))
88 # define ROTATE(a,n) (_rotr(a,n))
89 # elif defined(__GNUC__) && __GNUC__>=2 && !defined(__STRICT_ANSI__) && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM) && !defined(PEDANTIC)
90 # if defined(__i386) || defined(__i386__) || defined(__x86_64) || defined(__x86_64__)
91 # define ROTATE(a,n) ({ register unsigned int ret; \
101 # define ROTATE(a,n) (((a)>>(n))+((a)<<(32-(n))))
105 * Don't worry about the LOAD_DATA() stuff, that is used by fcrypt() to add
106 * it's little bit to the front
111 # define LOAD_DATA_tmp(R,S,u,t,E0,E1) \
112 { DES_LONG tmp; LOAD_DATA(R,S,u,t,E0,E1,tmp); }
114 # define LOAD_DATA(R,S,u,t,E0,E1,tmp) \
117 tmp=(u<<16); u^=R^s[S ]; u^=tmp; \
118 tmp=(t<<16); t^=R^s[S+1]; t^=tmp
120 # define LOAD_DATA_tmp(a,b,c,d,e,f) LOAD_DATA(a,b,c,d,e,f,g)
121 # define LOAD_DATA(R,S,u,t,E0,E1,tmp) \
127 * It recently occurred to me that 0^0^0^0^0^0^0 == 0, so there is no reason
128 * to not xor all the sub items together. This potentially saves a register
129 * since things can be xored directly into L
132 # define D_ENCRYPT(LL,R,S) { \
133 LOAD_DATA_tmp(R,S,u,t,E0,E1); \
136 DES_SPtrans[0][(u>> 2L)&0x3f]^ \
137 DES_SPtrans[2][(u>>10L)&0x3f]^ \
138 DES_SPtrans[4][(u>>18L)&0x3f]^ \
139 DES_SPtrans[6][(u>>26L)&0x3f]^ \
140 DES_SPtrans[1][(t>> 2L)&0x3f]^ \
141 DES_SPtrans[3][(t>>10L)&0x3f]^ \
142 DES_SPtrans[5][(t>>18L)&0x3f]^ \
143 DES_SPtrans[7][(t>>26L)&0x3f]; }
147 * The problem is more of a geometric problem that random bit fiddling.
148 0 1 2 3 4 5 6 7 62 54 46 38 30 22 14 6
149 8 9 10 11 12 13 14 15 60 52 44 36 28 20 12 4
150 16 17 18 19 20 21 22 23 58 50 42 34 26 18 10 2
151 24 25 26 27 28 29 30 31 to 56 48 40 32 24 16 8 0
153 32 33 34 35 36 37 38 39 63 55 47 39 31 23 15 7
154 40 41 42 43 44 45 46 47 61 53 45 37 29 21 13 5
155 48 49 50 51 52 53 54 55 59 51 43 35 27 19 11 3
156 56 57 58 59 60 61 62 63 57 49 41 33 25 17 9 1
158 The output has been subject to swaps of the form
159 0 1 -> 3 1 but the odd and even bits have been put into
161 different words. The main trick is to remember that
162 t=((l>>size)^r)&(mask);
165 can be used to swap and move bits between words.
167 So l = 0 1 2 3 r = 16 17 18 19
169 8 9 10 11 24 25 26 27
170 12 13 14 15 28 29 30 31
171 becomes (for size == 2 and mask == 0x3333)
172 t = 2^16 3^17 -- -- l = 0 1 16 17 r = 2 3 18 19
173 6^20 7^21 -- -- 4 5 20 21 6 7 22 23
174 10^24 11^25 -- -- 8 9 24 25 10 11 24 25
175 14^28 15^29 -- -- 12 13 28 29 14 15 28 29
177 Thanks for hints from Richard Outerbridge - he told me IP&FP
178 could be done in 15 xor, 10 shifts and 5 ands.
179 When I finally started to think of the problem in 2D
180 I first got ~42 operations without xors. When I remembered
181 how to use xors :-) I got it to its final state.
183 # define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
189 register DES_LONG tt; \
190 PERM_OP(r,l,tt, 4,0x0f0f0f0fL); \
191 PERM_OP(l,r,tt,16,0x0000ffffL); \
192 PERM_OP(r,l,tt, 2,0x33333333L); \
193 PERM_OP(l,r,tt, 8,0x00ff00ffL); \
194 PERM_OP(r,l,tt, 1,0x55555555L); \
199 register DES_LONG tt; \
200 PERM_OP(l,r,tt, 1,0x55555555L); \
201 PERM_OP(r,l,tt, 8,0x00ff00ffL); \
202 PERM_OP(l,r,tt, 2,0x33333333L); \
203 PERM_OP(r,l,tt,16,0x0000ffffL); \
204 PERM_OP(l,r,tt, 4,0x0f0f0f0fL); \
207 extern const DES_LONG DES_SPtrans[8][64];
209 void fcrypt_body(DES_LONG *out, DES_key_schedule *ks,
210 DES_LONG Eswap0, DES_LONG Eswap1);