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 /* used in des_read and des_write */
30 # define MAXWRITE (1024*16)
31 # define BSIZE (MAXWRITE+4)
33 # define c2l(c,l) (l =((DES_LONG)(*((c)++))) , \
34 l|=((DES_LONG)(*((c)++)))<< 8L, \
35 l|=((DES_LONG)(*((c)++)))<<16L, \
36 l|=((DES_LONG)(*((c)++)))<<24L)
38 /* NOTE - c is not incremented as per c2l */
39 # define c2ln(c,l1,l2,n) { \
43 case 8: l2 =((DES_LONG)(*(--(c))))<<24L; \
45 case 7: l2|=((DES_LONG)(*(--(c))))<<16L; \
47 case 6: l2|=((DES_LONG)(*(--(c))))<< 8L; \
49 case 5: l2|=((DES_LONG)(*(--(c)))); \
51 case 4: l1 =((DES_LONG)(*(--(c))))<<24L; \
53 case 3: l1|=((DES_LONG)(*(--(c))))<<16L; \
55 case 2: l1|=((DES_LONG)(*(--(c))))<< 8L; \
57 case 1: l1|=((DES_LONG)(*(--(c)))); \
61 # define l2c(l,c) (*((c)++)=(unsigned char)(((l) )&0xff), \
62 *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
63 *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
64 *((c)++)=(unsigned char)(((l)>>24L)&0xff))
67 * replacements for htonl and ntohl since I have no idea what to do when
68 * faced with machines with 8 byte longs.
72 # define n2l(c,l) (l =((DES_LONG)(*((c)++)))<<24L, \
73 l|=((DES_LONG)(*((c)++)))<<16L, \
74 l|=((DES_LONG)(*((c)++)))<< 8L, \
75 l|=((DES_LONG)(*((c)++))))
77 # define l2n(l,c) (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \
78 *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
79 *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
80 *((c)++)=(unsigned char)(((l) )&0xff))
82 /* NOTE - c is not incremented as per l2c */
83 # define l2cn(l1,l2,c,n) { \
86 case 8: *(--(c))=(unsigned char)(((l2)>>24L)&0xff); \
88 case 7: *(--(c))=(unsigned char)(((l2)>>16L)&0xff); \
90 case 6: *(--(c))=(unsigned char)(((l2)>> 8L)&0xff); \
92 case 5: *(--(c))=(unsigned char)(((l2) )&0xff); \
94 case 4: *(--(c))=(unsigned char)(((l1)>>24L)&0xff); \
96 case 3: *(--(c))=(unsigned char)(((l1)>>16L)&0xff); \
98 case 2: *(--(c))=(unsigned char)(((l1)>> 8L)&0xff); \
100 case 1: *(--(c))=(unsigned char)(((l1) )&0xff); \
104 # if (defined(OPENSSL_SYS_WIN32) && defined(_MSC_VER))
105 # define ROTATE(a,n) (_lrotr(a,n))
106 # elif defined(__ICC)
107 # define ROTATE(a,n) (_rotr(a,n))
108 # elif defined(__GNUC__) && __GNUC__>=2 && !defined(__STRICT_ANSI__) && !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM) && !defined(PEDANTIC)
109 # if defined(__i386) || defined(__i386__) || defined(__x86_64) || defined(__x86_64__)
110 # define ROTATE(a,n) ({ register unsigned int ret; \
120 # define ROTATE(a,n) (((a)>>(n))+((a)<<(32-(n))))
124 * Don't worry about the LOAD_DATA() stuff, that is used by fcrypt() to add
125 * it's little bit to the front
130 # define LOAD_DATA_tmp(R,S,u,t,E0,E1) \
131 { DES_LONG tmp; LOAD_DATA(R,S,u,t,E0,E1,tmp); }
133 # define LOAD_DATA(R,S,u,t,E0,E1,tmp) \
136 tmp=(u<<16); u^=R^s[S ]; u^=tmp; \
137 tmp=(t<<16); t^=R^s[S+1]; t^=tmp
139 # define LOAD_DATA_tmp(a,b,c,d,e,f) LOAD_DATA(a,b,c,d,e,f,g)
140 # define LOAD_DATA(R,S,u,t,E0,E1,tmp) \
146 * It recently occurred to me that 0^0^0^0^0^0^0 == 0, so there is no reason
147 * to not xor all the sub items together. This potentially saves a register
148 * since things can be xored directly into L
151 # define D_ENCRYPT(LL,R,S) { \
152 LOAD_DATA_tmp(R,S,u,t,E0,E1); \
155 DES_SPtrans[0][(u>> 2L)&0x3f]^ \
156 DES_SPtrans[2][(u>>10L)&0x3f]^ \
157 DES_SPtrans[4][(u>>18L)&0x3f]^ \
158 DES_SPtrans[6][(u>>26L)&0x3f]^ \
159 DES_SPtrans[1][(t>> 2L)&0x3f]^ \
160 DES_SPtrans[3][(t>>10L)&0x3f]^ \
161 DES_SPtrans[5][(t>>18L)&0x3f]^ \
162 DES_SPtrans[7][(t>>26L)&0x3f]; }
166 * The problem is more of a geometric problem that random bit fiddling.
167 0 1 2 3 4 5 6 7 62 54 46 38 30 22 14 6
168 8 9 10 11 12 13 14 15 60 52 44 36 28 20 12 4
169 16 17 18 19 20 21 22 23 58 50 42 34 26 18 10 2
170 24 25 26 27 28 29 30 31 to 56 48 40 32 24 16 8 0
172 32 33 34 35 36 37 38 39 63 55 47 39 31 23 15 7
173 40 41 42 43 44 45 46 47 61 53 45 37 29 21 13 5
174 48 49 50 51 52 53 54 55 59 51 43 35 27 19 11 3
175 56 57 58 59 60 61 62 63 57 49 41 33 25 17 9 1
177 The output has been subject to swaps of the form
178 0 1 -> 3 1 but the odd and even bits have been put into
180 different words. The main trick is to remember that
181 t=((l>>size)^r)&(mask);
184 can be used to swap and move bits between words.
186 So l = 0 1 2 3 r = 16 17 18 19
188 8 9 10 11 24 25 26 27
189 12 13 14 15 28 29 30 31
190 becomes (for size == 2 and mask == 0x3333)
191 t = 2^16 3^17 -- -- l = 0 1 16 17 r = 2 3 18 19
192 6^20 7^21 -- -- 4 5 20 21 6 7 22 23
193 10^24 11^25 -- -- 8 9 24 25 10 11 24 25
194 14^28 15^29 -- -- 12 13 28 29 14 15 28 29
196 Thanks for hints from Richard Outerbridge - he told me IP&FP
197 could be done in 15 xor, 10 shifts and 5 ands.
198 When I finally started to think of the problem in 2D
199 I first got ~42 operations without xors. When I remembered
200 how to use xors :-) I got it to its final state.
202 # define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
208 register DES_LONG tt; \
209 PERM_OP(r,l,tt, 4,0x0f0f0f0fL); \
210 PERM_OP(l,r,tt,16,0x0000ffffL); \
211 PERM_OP(r,l,tt, 2,0x33333333L); \
212 PERM_OP(l,r,tt, 8,0x00ff00ffL); \
213 PERM_OP(r,l,tt, 1,0x55555555L); \
218 register DES_LONG tt; \
219 PERM_OP(l,r,tt, 1,0x55555555L); \
220 PERM_OP(r,l,tt, 8,0x00ff00ffL); \
221 PERM_OP(l,r,tt, 2,0x33333333L); \
222 PERM_OP(r,l,tt,16,0x0000ffffL); \
223 PERM_OP(l,r,tt, 4,0x0f0f0f0fL); \
226 extern const DES_LONG DES_SPtrans[8][64];
228 void fcrypt_body(DES_LONG *out, DES_key_schedule *ks,
229 DES_LONG Eswap0, DES_LONG Eswap1);