eeccf7a8 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: tiger.h,v 1.1 2000/07/15 10:02:43 mdw Exp $ |
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 $ |
33 | * Revision 1.1 2000/07/15 10:02:43 mdw |
34 | * Anderson and Biham's Tiger hash function added. |
35 | * |
36 | */ |
37 | |
38 | /*----- Notes on the Tiger hash function ----------------------------------* |
39 | * |
40 | * Tiger was designed by Eli Biham and Ross Anderson to be an efficient and |
41 | * secure hash function which worked well on 64-bit processors. This |
42 | * implementation should work everywhere, but it'll be faster if real 64-bit |
43 | * arithmetic is available. |
44 | * |
45 | * I don't know of any really good analysis of Tiger. |
46 | */ |
47 | |
48 | #ifndef CATACOMB_TIGER_H |
49 | #define CATACOMB_TIGER_H |
50 | |
51 | #ifdef __cplusplus |
52 | extern "C" { |
53 | #endif |
54 | |
55 | /*----- Header files ------------------------------------------------------*/ |
56 | |
57 | #include <mLib/bits.h> |
58 | |
59 | #ifndef CATACOMB_GHASH_H |
60 | # include "ghash.h" |
61 | #endif |
62 | |
63 | /*----- Magic numbers -----------------------------------------------------*/ |
64 | |
65 | #define TIGER_BUFSZ 64 |
66 | #define TIGER_HASHSZ 24 |
67 | |
68 | /*----- Data structures ---------------------------------------------------*/ |
69 | |
70 | typedef struct tiger_ctx { |
71 | kludge64 a, b, c; /* Chaining variables */ |
72 | uint32 nl, nh; /* Byte count so far */ |
73 | unsigned off; /* Offset into buffer */ |
74 | octet buf[TIGER_BUFSZ]; /* Accumulation buffer */ |
75 | } tiger_ctx; |
76 | |
77 | /*----- Functions provided ------------------------------------------------*/ |
78 | |
79 | /* --- @tiger_compress@ --- * |
80 | * |
81 | * Arguments: @tiger_ctx *ctx@ = pointer to context block |
82 | * @const void *sbuf@ = pointer to buffer of appropriate size |
83 | * |
84 | * Returns: --- |
85 | * |
86 | * Use: Tiger compression function. |
87 | */ |
88 | |
89 | extern void tiger_compress(tiger_ctx */*ctx*/, const void */*sbuf*/); |
90 | |
91 | /* --- @tiger_init@ --- * |
92 | * |
93 | * Arguments: @tiger_ctx *ctx@ = pointer to context block to initialize |
94 | * |
95 | * Returns: --- |
96 | * |
97 | * Use: Initializes a context block ready for hashing. |
98 | */ |
99 | |
100 | extern void tiger_init(tiger_ctx */*ctx*/); |
101 | |
102 | /* --- @tiger_set@ --- * |
103 | * |
104 | * Arguments: @tiger_ctx *ctx@ = pointer to context block |
105 | * @const void *buf@ = pointer to state buffer |
106 | * @unsigned long count@ = current count of bytes processed |
107 | * |
108 | * Returns: --- |
109 | * |
110 | * Use: Initializes a context block from a given state. This is |
111 | * useful in cases where the initial hash state is meant to be |
112 | * secret, e.g., for NMAC and HMAC support. |
113 | */ |
114 | |
115 | extern void tiger_set(tiger_ctx */*ctx*/, const void */*buf*/, |
116 | unsigned long /*count*/); |
117 | |
118 | /* --- @tiger_hash@ --- * |
119 | * |
120 | * Arguments: @tiger_ctx *ctx@ = pointer to context block |
121 | * @const void *buf@ = buffer of data to hash |
122 | * @size_t sz@ = size of buffer to hash |
123 | * |
124 | * Returns: --- |
125 | * |
126 | * Use: Hashes a buffer of data. The buffer may be of any size and |
127 | * alignment. |
128 | */ |
129 | |
130 | extern void tiger_hash(tiger_ctx */*ctx*/, const void */*buf*/, size_t /*sz*/); |
131 | |
132 | /* --- @tiger_done@ --- * |
133 | * |
134 | * Arguments: @tiger_ctx *ctx@ = pointer to context block |
135 | * @void *hash@ = pointer to output buffer |
136 | * |
137 | * Returns: --- |
138 | * |
139 | * Use: Returns the hash of the data read so far. |
140 | */ |
141 | |
142 | extern void tiger_done(tiger_ctx */*ctx*/, void */*hash*/); |
143 | |
144 | /* --- @tiger_state@ --- * |
145 | * |
146 | * Arguments: @tiger_ctx *ctx@ = pointer to context |
147 | * @void *state@ = pointer to buffer for current state |
148 | * |
149 | * Returns: Number of bytes written to the hash function so far. |
150 | * |
151 | * Use: Returns the current state of the hash function such that |
152 | * it can be passed to @tiger_set@. |
153 | */ |
154 | |
155 | extern unsigned long tiger_state(tiger_ctx */*ctx*/, void */*state*/); |
156 | |
157 | /*----- Generic hash interface --------------------------------------------*/ |
158 | |
159 | extern const gchash tiger; |
160 | |
161 | /*----- That's all, folks -------------------------------------------------*/ |
162 | |
163 | #ifdef __cplusplus |
164 | } |
165 | #endif |
166 | |
167 | #endif |