1/*
2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (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 OSSL_CRYPTO_BF_LOCAL_H
11# define OSSL_CRYPTO_BF_LOCAL_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
85