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1 | /* -*-c-*- |
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2 | * |
3 | * Implementation of the Whirlpool hash function |
4 | * |
5 | * (c) 2000 Straylight/Edgeware |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of Catacomb. |
11 | * |
12 | * Catacomb is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU Library General Public License as |
14 | * published by the Free Software Foundation; either version 2 of the |
15 | * License, or (at your option) any later version. |
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16 | * |
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17 | * Catacomb is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU Library General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU Library General Public |
23 | * License along with Catacomb; if not, write to the Free |
24 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
25 | * MA 02111-1307, USA. |
26 | */ |
27 | |
28 | /*----- Notes on the Whirlpool hash function ------------------------------* |
29 | * |
30 | * Whirlpool was designed by Paulo Barreto and Vincent Rijmen. Its |
31 | * compression function is based on similar ideas to Rijndael (also |
32 | * codesigned by Rijmen). |
33 | * |
34 | * Whirlpool256 is simply Whirlpool with its final output truncated to 256 |
35 | * bits. This is, I hope, about as good as a 256-bit hash function can get. |
36 | * It isn't vulnerable to the Kelsey-Schneier generic second-preimage attack |
37 | * against MD hash functions because of its larger internal state (see also |
38 | * Lucks). |
39 | */ |
40 | |
41 | #ifndef CATACOMB_WHIRLPOOL_H |
42 | #define CATACOMB_WHIRLPOOL_H |
43 | #define CATACOMB_WHIRLPOOL256_H |
44 | |
45 | #ifdef __cplusplus |
46 | extern "C" { |
47 | #endif |
48 | |
49 | /*----- Header files ------------------------------------------------------*/ |
50 | |
51 | #include <mLib/bits.h> |
52 | |
53 | #ifndef CATACOMB_GHASH_H |
54 | # include "ghash.h" |
55 | #endif |
56 | |
57 | /*----- Magic numbers -----------------------------------------------------*/ |
58 | |
59 | #define WHIRLPOOL_BUFSZ 64 |
60 | #define WHIRLPOOL_HASHSZ 64 |
61 | #define WHIRLPOOL_STATESZ 64 |
62 | |
63 | #define WHIRLPOOL256_BUFSZ 64 |
64 | #define WHIRLPOOL256_HASHSZ 32 |
65 | #define WHIRLPOOL256_STATESZ 64 |
66 | |
67 | /*----- Data structures ---------------------------------------------------*/ |
68 | |
69 | typedef struct whirlpool_ctx { |
70 | kludge64 s[8]; /* Chaining variables */ |
71 | uint32 nh, nl; /* Byte count so far */ |
72 | unsigned off; /* Offset into buffer */ |
73 | octet buf[WHIRLPOOL_BUFSZ]; /* Accumulation buffer */ |
74 | } whirlpool_ctx, whirlpool256_ctx; |
75 | |
76 | /*----- Functions provided ------------------------------------------------*/ |
77 | |
78 | /* --- @whirlpool_compress@, @whirlpool256_compress@ --- * |
79 | * |
80 | * Arguments: @whirlpool_ctx *ctx@ = pointer to context block |
81 | * @const void *sbuf@ = pointer to buffer of appropriate size |
82 | * |
83 | * Returns: --- |
84 | * |
85 | * Use: SHA-512 compression function. |
86 | */ |
87 | |
88 | extern void whirlpool_compress(whirlpool_ctx */*ctx*/, const void */*sbuf*/); |
89 | #define whirlpool256_compress whirlpool_compress |
90 | |
91 | /* --- @whirlpool_init@, @whirlpool256_init@ --- * |
92 | * |
93 | * Arguments: @whirlpool_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 whirlpool_init(whirlpool_ctx */*ctx*/); |
101 | #define whirlpool256_init whirlpool_init |
102 | |
103 | /* --- @whirlpool_set@, @whirlpool256_set@ --- * |
104 | * |
105 | * Arguments: @whirlpool_ctx *ctx@ = pointer to context block |
106 | * @const void *buf@ = pointer to state buffer |
107 | * @unsigned long count@ = current count of bytes processed |
108 | * |
109 | * Returns: --- |
110 | * |
111 | * Use: Initializes a context block from a given state. This is |
112 | * useful in cases where the initial hash state is meant to be |
113 | * secret, e.g., for NMAC and HMAC support. |
114 | */ |
115 | |
116 | extern void whirlpool_set(whirlpool_ctx */*ctx*/, const void */*buf*/, |
117 | unsigned long /*count*/); |
118 | #define whirlpool256_set whirlpool_set |
119 | |
120 | /* --- @whirlpool_hash@, @whirlpool256_hash@ --- * |
121 | * |
122 | * Arguments: @whirlpool_ctx *ctx@ = pointer to context block |
123 | * @const void *buf@ = buffer of data to hash |
124 | * @size_t sz@ = size of buffer to hash |
125 | * |
126 | * Returns: --- |
127 | * |
128 | * Use: Hashes a buffer of data. The buffer may be of any size and |
129 | * alignment. |
130 | */ |
131 | |
132 | extern void whirlpool_hash(whirlpool_ctx */*ctx*/, |
133 | const void */*buf*/, size_t /*sz*/); |
134 | #define whirlpool256_hash whirlpool_hash |
135 | |
136 | /* --- @whirlpool_done@, @whirlpool256_done@ --- * |
137 | * |
138 | * Arguments: @whirlpool_ctx *ctx@ = pointer to context block |
139 | * @void *hash@ = pointer to output buffer |
140 | * |
141 | * Returns: --- |
142 | * |
143 | * Use: Returns the hash of the data read so far. |
144 | */ |
145 | |
146 | extern void whirlpool_done(whirlpool_ctx */*ctx*/, void */*hash*/); |
147 | extern void whirlpool256_done(whirlpool_ctx */*ctx*/, void */*hash*/); |
148 | |
149 | /* --- @whirlpool_state@, @whirlpool256_state@ --- * |
150 | * |
151 | * Arguments: @whirlpool_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 @whirlpool_set@. |
158 | */ |
159 | |
160 | extern unsigned long whirlpool_state(whirlpool_ctx */*ctx*/, |
161 | void */*state*/); |
162 | #define whirlpool256_state whirlpool_state |
163 | |
164 | /*----- Generic hash interface --------------------------------------------*/ |
165 | |
166 | extern const gchash whirlpool; |
167 | extern const gchash whirlpool256; |
168 | |
169 | /*----- That's all, folks -------------------------------------------------*/ |
170 | |
171 | #ifdef __cplusplus |
172 | } |
173 | #endif |
174 | |
175 | #endif |