b1a415e5132c1fc9be67f5b27195722b6ef729e3
[openssl.git] / crypto / bf / bf_locl.h
1 /*
2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
3  *
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
8  */
9
10 #ifndef HEADER_BF_LOCL_H
11 # define HEADER_BF_LOCL_H
12 # include <openssl/opensslconf.h>
13
14 /* NOTE - c is not incremented as per n2l */
15 # define n2ln(c,l1,l2,n) { \
16                         c+=n; \
17                         l1=l2=0; \
18                         switch (n) { \
19                         case 8: l2 =((unsigned long)(*(--(c))))    ; \
20                         /* fall thru */                              \
21                         case 7: l2|=((unsigned long)(*(--(c))))<< 8; \
22                         /* fall thru */                              \
23                         case 6: l2|=((unsigned long)(*(--(c))))<<16; \
24                         /* fall thru */                              \
25                         case 5: l2|=((unsigned long)(*(--(c))))<<24; \
26                         /* fall thru */                              \
27                         case 4: l1 =((unsigned long)(*(--(c))))    ; \
28                         /* fall thru */                              \
29                         case 3: l1|=((unsigned long)(*(--(c))))<< 8; \
30                         /* fall thru */                              \
31                         case 2: l1|=((unsigned long)(*(--(c))))<<16; \
32                         /* fall thru */                              \
33                         case 1: l1|=((unsigned long)(*(--(c))))<<24; \
34                                 } \
35                         }
36
37 /* NOTE - c is not incremented as per l2n */
38 # define l2nn(l1,l2,c,n) { \
39                         c+=n; \
40                         switch (n) { \
41                         case 8: *(--(c))=(unsigned char)(((l2)    )&0xff); \
42                         /* fall thru */                                    \
43                         case 7: *(--(c))=(unsigned char)(((l2)>> 8)&0xff); \
44                         /* fall thru */                                    \
45                         case 6: *(--(c))=(unsigned char)(((l2)>>16)&0xff); \
46                         /* fall thru */                                    \
47                         case 5: *(--(c))=(unsigned char)(((l2)>>24)&0xff); \
48                         /* fall thru */                                    \
49                         case 4: *(--(c))=(unsigned char)(((l1)    )&0xff); \
50                         /* fall thru */                                    \
51                         case 3: *(--(c))=(unsigned char)(((l1)>> 8)&0xff); \
52                         /* fall thru */                                    \
53                         case 2: *(--(c))=(unsigned char)(((l1)>>16)&0xff); \
54                         /* fall thru */                                    \
55                         case 1: *(--(c))=(unsigned char)(((l1)>>24)&0xff); \
56                                 } \
57                         }
58
59 # undef n2l
60 # define n2l(c,l)        (l =((unsigned long)(*((c)++)))<<24L, \
61                          l|=((unsigned long)(*((c)++)))<<16L, \
62                          l|=((unsigned long)(*((c)++)))<< 8L, \
63                          l|=((unsigned long)(*((c)++))))
64
65 # undef l2n
66 # define l2n(l,c)        (*((c)++)=(unsigned char)(((l)>>24L)&0xff), \
67                          *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
68                          *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
69                          *((c)++)=(unsigned char)(((l)     )&0xff))
70
71 /*
72  * This is actually a big endian algorithm, the most significant byte is used
73  * to lookup array 0
74  */
75
76 # define BF_ENC(LL,R,S,P) ( \
77         LL^=P, \
78         LL^=((( S[       ((R>>24)&0xff)] + \
79                 S[0x0100+((R>>16)&0xff)])^ \
80                 S[0x0200+((R>> 8)&0xff)])+ \
81                 S[0x0300+((R    )&0xff)])&0xffffffffU \
82         )
83
84 #endif