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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: tiger.h,v 1.2 2000/10/15 19:09:20 mdw Exp $ |
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4 | * |
5 | * The Tiger hash function |
6 | * |
7 | * (c) 2000 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: tiger.h,v $ |
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33 | * Revision 1.2 2000/10/15 19:09:20 mdw |
34 | * Support HMAC mode for hash functions which need to store more state than |
35 | * the hash output size. |
36 | * |
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37 | * Revision 1.1 2000/07/15 10:02:43 mdw |
38 | * Anderson and Biham's Tiger hash function added. |
39 | * |
40 | */ |
41 | |
42 | /*----- Notes on the Tiger hash function ----------------------------------* |
43 | * |
44 | * Tiger was designed by Eli Biham and Ross Anderson to be an efficient and |
45 | * secure hash function which worked well on 64-bit processors. This |
46 | * implementation should work everywhere, but it'll be faster if real 64-bit |
47 | * arithmetic is available. |
48 | * |
49 | * I don't know of any really good analysis of Tiger. |
50 | */ |
51 | |
52 | #ifndef CATACOMB_TIGER_H |
53 | #define CATACOMB_TIGER_H |
54 | |
55 | #ifdef __cplusplus |
56 | extern "C" { |
57 | #endif |
58 | |
59 | /*----- Header files ------------------------------------------------------*/ |
60 | |
61 | #include <mLib/bits.h> |
62 | |
63 | #ifndef CATACOMB_GHASH_H |
64 | # include "ghash.h" |
65 | #endif |
66 | |
67 | /*----- Magic numbers -----------------------------------------------------*/ |
68 | |
69 | #define TIGER_BUFSZ 64 |
70 | #define TIGER_HASHSZ 24 |
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71 | #define TIGER_STATESZ 24 |
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72 | |
73 | /*----- Data structures ---------------------------------------------------*/ |
74 | |
75 | typedef struct tiger_ctx { |
76 | kludge64 a, b, c; /* Chaining variables */ |
77 | uint32 nl, nh; /* Byte count so far */ |
78 | unsigned off; /* Offset into buffer */ |
79 | octet buf[TIGER_BUFSZ]; /* Accumulation buffer */ |
80 | } tiger_ctx; |
81 | |
82 | /*----- Functions provided ------------------------------------------------*/ |
83 | |
84 | /* --- @tiger_compress@ --- * |
85 | * |
86 | * Arguments: @tiger_ctx *ctx@ = pointer to context block |
87 | * @const void *sbuf@ = pointer to buffer of appropriate size |
88 | * |
89 | * Returns: --- |
90 | * |
91 | * Use: Tiger compression function. |
92 | */ |
93 | |
94 | extern void tiger_compress(tiger_ctx */*ctx*/, const void */*sbuf*/); |
95 | |
96 | /* --- @tiger_init@ --- * |
97 | * |
98 | * Arguments: @tiger_ctx *ctx@ = pointer to context block to initialize |
99 | * |
100 | * Returns: --- |
101 | * |
102 | * Use: Initializes a context block ready for hashing. |
103 | */ |
104 | |
105 | extern void tiger_init(tiger_ctx */*ctx*/); |
106 | |
107 | /* --- @tiger_set@ --- * |
108 | * |
109 | * Arguments: @tiger_ctx *ctx@ = pointer to context block |
110 | * @const void *buf@ = pointer to state buffer |
111 | * @unsigned long count@ = current count of bytes processed |
112 | * |
113 | * Returns: --- |
114 | * |
115 | * Use: Initializes a context block from a given state. This is |
116 | * useful in cases where the initial hash state is meant to be |
117 | * secret, e.g., for NMAC and HMAC support. |
118 | */ |
119 | |
120 | extern void tiger_set(tiger_ctx */*ctx*/, const void */*buf*/, |
121 | unsigned long /*count*/); |
122 | |
123 | /* --- @tiger_hash@ --- * |
124 | * |
125 | * Arguments: @tiger_ctx *ctx@ = pointer to context block |
126 | * @const void *buf@ = buffer of data to hash |
127 | * @size_t sz@ = size of buffer to hash |
128 | * |
129 | * Returns: --- |
130 | * |
131 | * Use: Hashes a buffer of data. The buffer may be of any size and |
132 | * alignment. |
133 | */ |
134 | |
135 | extern void tiger_hash(tiger_ctx */*ctx*/, const void */*buf*/, size_t /*sz*/); |
136 | |
137 | /* --- @tiger_done@ --- * |
138 | * |
139 | * Arguments: @tiger_ctx *ctx@ = pointer to context block |
140 | * @void *hash@ = pointer to output buffer |
141 | * |
142 | * Returns: --- |
143 | * |
144 | * Use: Returns the hash of the data read so far. |
145 | */ |
146 | |
147 | extern void tiger_done(tiger_ctx */*ctx*/, void */*hash*/); |
148 | |
149 | /* --- @tiger_state@ --- * |
150 | * |
151 | * Arguments: @tiger_ctx *ctx@ = pointer to context |
152 | * @void *state@ = pointer to buffer for current state |
153 | * |
154 | * Returns: Number of bytes written to the hash function so far. |
155 | * |
156 | * Use: Returns the current state of the hash function such that |
157 | * it can be passed to @tiger_set@. |
158 | */ |
159 | |
160 | extern unsigned long tiger_state(tiger_ctx */*ctx*/, void */*state*/); |
161 | |
162 | /*----- Generic hash interface --------------------------------------------*/ |
163 | |
164 | extern const gchash tiger; |
165 | |
166 | /*----- That's all, folks -------------------------------------------------*/ |
167 | |
168 | #ifdef __cplusplus |
169 | } |
170 | #endif |
171 | |
172 | #endif |