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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: tiger.h,v 1.3 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * The Tiger hash function |
6 | * |
7 | * (c) 2000 Straylight/Edgeware |
8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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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. |
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18 | * |
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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. |
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23 | * |
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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 | |
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30 | /*----- Notes on the Tiger hash function ----------------------------------* |
31 | * |
32 | * Tiger was designed by Eli Biham and Ross Anderson to be an efficient and |
33 | * secure hash function which worked well on 64-bit processors. This |
34 | * implementation should work everywhere, but it'll be faster if real 64-bit |
35 | * arithmetic is available. |
36 | * |
37 | * I don't know of any really good analysis of Tiger. |
38 | */ |
39 | |
40 | #ifndef CATACOMB_TIGER_H |
41 | #define CATACOMB_TIGER_H |
42 | |
43 | #ifdef __cplusplus |
44 | extern "C" { |
45 | #endif |
46 | |
47 | /*----- Header files ------------------------------------------------------*/ |
48 | |
49 | #include <mLib/bits.h> |
50 | |
51 | #ifndef CATACOMB_GHASH_H |
52 | # include "ghash.h" |
53 | #endif |
54 | |
55 | /*----- Magic numbers -----------------------------------------------------*/ |
56 | |
57 | #define TIGER_BUFSZ 64 |
58 | #define TIGER_HASHSZ 24 |
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59 | #define TIGER_STATESZ 24 |
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60 | |
61 | /*----- Data structures ---------------------------------------------------*/ |
62 | |
63 | typedef struct tiger_ctx { |
64 | kludge64 a, b, c; /* Chaining variables */ |
65 | uint32 nl, nh; /* Byte count so far */ |
66 | unsigned off; /* Offset into buffer */ |
67 | octet buf[TIGER_BUFSZ]; /* Accumulation buffer */ |
68 | } tiger_ctx; |
69 | |
70 | /*----- Functions provided ------------------------------------------------*/ |
71 | |
72 | /* --- @tiger_compress@ --- * |
73 | * |
74 | * Arguments: @tiger_ctx *ctx@ = pointer to context block |
75 | * @const void *sbuf@ = pointer to buffer of appropriate size |
76 | * |
77 | * Returns: --- |
78 | * |
79 | * Use: Tiger compression function. |
80 | */ |
81 | |
82 | extern void tiger_compress(tiger_ctx */*ctx*/, const void */*sbuf*/); |
83 | |
84 | /* --- @tiger_init@ --- * |
85 | * |
86 | * Arguments: @tiger_ctx *ctx@ = pointer to context block to initialize |
87 | * |
88 | * Returns: --- |
89 | * |
90 | * Use: Initializes a context block ready for hashing. |
91 | */ |
92 | |
93 | extern void tiger_init(tiger_ctx */*ctx*/); |
94 | |
95 | /* --- @tiger_set@ --- * |
96 | * |
97 | * Arguments: @tiger_ctx *ctx@ = pointer to context block |
98 | * @const void *buf@ = pointer to state buffer |
99 | * @unsigned long count@ = current count of bytes processed |
100 | * |
101 | * Returns: --- |
102 | * |
103 | * Use: Initializes a context block from a given state. This is |
104 | * useful in cases where the initial hash state is meant to be |
105 | * secret, e.g., for NMAC and HMAC support. |
106 | */ |
107 | |
108 | extern void tiger_set(tiger_ctx */*ctx*/, const void */*buf*/, |
109 | unsigned long /*count*/); |
110 | |
111 | /* --- @tiger_hash@ --- * |
112 | * |
113 | * Arguments: @tiger_ctx *ctx@ = pointer to context block |
114 | * @const void *buf@ = buffer of data to hash |
115 | * @size_t sz@ = size of buffer to hash |
116 | * |
117 | * Returns: --- |
118 | * |
119 | * Use: Hashes a buffer of data. The buffer may be of any size and |
120 | * alignment. |
121 | */ |
122 | |
123 | extern void tiger_hash(tiger_ctx */*ctx*/, const void */*buf*/, size_t /*sz*/); |
124 | |
125 | /* --- @tiger_done@ --- * |
126 | * |
127 | * Arguments: @tiger_ctx *ctx@ = pointer to context block |
128 | * @void *hash@ = pointer to output buffer |
129 | * |
130 | * Returns: --- |
131 | * |
132 | * Use: Returns the hash of the data read so far. |
133 | */ |
134 | |
135 | extern void tiger_done(tiger_ctx */*ctx*/, void */*hash*/); |
136 | |
137 | /* --- @tiger_state@ --- * |
138 | * |
139 | * Arguments: @tiger_ctx *ctx@ = pointer to context |
140 | * @void *state@ = pointer to buffer for current state |
141 | * |
142 | * Returns: Number of bytes written to the hash function so far. |
143 | * |
144 | * Use: Returns the current state of the hash function such that |
145 | * it can be passed to @tiger_set@. |
146 | */ |
147 | |
148 | extern unsigned long tiger_state(tiger_ctx */*ctx*/, void */*state*/); |
149 | |
150 | /*----- Generic hash interface --------------------------------------------*/ |
151 | |
152 | extern const gchash tiger; |
153 | |
154 | /*----- That's all, folks -------------------------------------------------*/ |
155 | |
156 | #ifdef __cplusplus |
157 | } |
158 | #endif |
159 | |
160 | #endif |