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blf.h
1 /* $OpenBSD: blf.h,v 1.8 2021/11/29 01:04:45 djm Exp $ */
2 /*
3  * Blowfish - a fast block cipher designed by Bruce Schneier
4  *
5  * Copyright 1997 Niels Provos <[email protected]>
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  * notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  * notice, this list of conditions and the following disclaimer in the
15  * documentation and/or other materials provided with the distribution.
16  * 3. The name of the author may not be used to endorse or promote products
17  * derived from this software without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29  */
30 
31 #ifndef _BLF_H_
32 #define _BLF_H_
33 
34 #include "includes.h"
35 
36 #if !defined(HAVE_BCRYPT_PBKDF) && !defined(HAVE_BLH_H)
37 
38 /* Schneier specifies a maximum key length of 56 bytes.
39  * This ensures that every key bit affects every cipher
40  * bit. However, the subkeys can hold up to 72 bytes.
41  * Warning: For normal blowfish encryption only 56 bytes
42  * of the key affect all cipherbits.
43  */
44 
45 #define BLF_N 16 /* Number of Subkeys */
46 #define BLF_MAXKEYLEN ((BLF_N-2)*4) /* 448 bits */
47 #define BLF_MAXUTILIZED ((BLF_N+2)*4) /* 576 bits */
48 
49 /* Blowfish context */
50 typedef struct BlowfishContext {
51  u_int32_t S[4][256]; /* S-Boxes */
52  u_int32_t P[BLF_N + 2]; /* Subkeys */
53 } blf_ctx;
54 
55 /* Raw access to customized Blowfish
56  * blf_key is just:
57  * Blowfish_initstate( state )
58  * Blowfish_expand0state( state, key, keylen )
59  */
60 
61 void Blowfish_encipher(blf_ctx *, u_int32_t *, u_int32_t *);
62 void Blowfish_decipher(blf_ctx *, u_int32_t *, u_int32_t *);
63 void Blowfish_initstate(blf_ctx *);
64 void Blowfish_expand0state(blf_ctx *, const u_int8_t *, u_int16_t);
65 void Blowfish_expandstate
66 (blf_ctx *, const u_int8_t *, u_int16_t, const u_int8_t *, u_int16_t);
67 
68 /* Standard Blowfish */
69 
70 void blf_key(blf_ctx *, const u_int8_t *, u_int16_t);
71 void blf_enc(blf_ctx *, u_int32_t *, u_int16_t);
72 void blf_dec(blf_ctx *, u_int32_t *, u_int16_t);
73 
74 void blf_ecb_encrypt(blf_ctx *, u_int8_t *, u_int32_t);
75 void blf_ecb_decrypt(blf_ctx *, u_int8_t *, u_int32_t);
76 
77 void blf_cbc_encrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t);
78 void blf_cbc_decrypt(blf_ctx *, u_int8_t *, u_int8_t *, u_int32_t);
79 
80 /* Converts u_int8_t to u_int32_t */
81 u_int32_t Blowfish_stream2word(const u_int8_t *, u_int16_t , u_int16_t *);
82 
83 #endif /* !defined(HAVE_BCRYPT_PBKDF) && !defined(HAVE_BLH_H) */
84 #endif /* _BLF_H */
85