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eeccf7a8 | 1 | /* -*-c-*- |
2 | * | |
b817bfc6 | 3 | * $Id: tiger.c,v 1.2 2004/04/08 01:36:15 mdw Exp $ |
eeccf7a8 | 4 | * |
5 | * The Tiger hash function | |
6 | * | |
7 | * (c) 2000 Straylight/Edgeware | |
8 | */ | |
9 | ||
45c0fd36 | 10 | /*----- Licensing notice --------------------------------------------------* |
eeccf7a8 | 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. | |
45c0fd36 | 18 | * |
eeccf7a8 | 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. | |
45c0fd36 | 23 | * |
eeccf7a8 | 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 | ||
eeccf7a8 | 30 | /*----- Header files ------------------------------------------------------*/ |
31 | ||
32 | #include <mLib/bits.h> | |
33 | ||
34 | #include "ghash-def.h" | |
35 | #include "hash.h" | |
36 | #include "tiger.h" | |
37 | #include "tiger-tab.h" | |
38 | #include "tiger-base.h" | |
39 | ||
40 | /*----- S-boxes -----------------------------------------------------------*/ | |
41 | ||
42 | static const kludge64 s[4][256] = TIGER_S; | |
43 | ||
44 | /*----- Main code ---------------------------------------------------------*/ | |
45 | ||
46 | /* --- @tiger_compress@ --- * | |
47 | * | |
48 | * Arguments: @tiger_ctx *ctx@ = pointer to context block | |
49 | * @const void *sbuf@ = pointer to buffer of appropriate size | |
50 | * | |
51 | * Returns: --- | |
52 | * | |
53 | * Use: Tiger compression function. | |
54 | */ | |
55 | ||
56 | void tiger_compress(tiger_ctx *ctx, const void *sbuf) | |
57 | { | |
58 | kludge64 x[8]; | |
59 | int i; | |
60 | const octet *p; | |
61 | for (i = 0, p = sbuf; i < 8; i++, p += 8) | |
62 | LOAD64_L_(x[i], p); | |
63 | TIGER_CORE(ctx->a, ctx->b, ctx->c, x); | |
64 | } | |
65 | ||
66 | /* --- @tiger_init@ --- * | |
67 | * | |
68 | * Arguments: @tiger_ctx *ctx@ = pointer to context block to initialize | |
69 | * | |
70 | * Returns: --- | |
71 | * | |
72 | * Use: Initializes a context block ready for hashing. | |
73 | */ | |
74 | ||
75 | void tiger_init(tiger_ctx *ctx) | |
76 | { | |
77 | SET64(ctx->a, 0x01234567, 0x89abcdef); | |
78 | SET64(ctx->b, 0xfedcba98, 0x76543210); | |
79 | SET64(ctx->c, 0xf096a5b4, 0xc3b2e187); | |
80 | ctx->off = 0; | |
81 | ctx->nl = ctx->nh = 0; | |
82 | } | |
83 | ||
84 | /* --- @tiger_set@ --- * | |
85 | * | |
86 | * Arguments: @tiger_ctx *ctx@ = pointer to context block | |
87 | * @const void *buf@ = pointer to state buffer | |
88 | * @unsigned long count@ = current count of bytes processed | |
89 | * | |
90 | * Returns: --- | |
91 | * | |
92 | * Use: Initializes a context block from a given state. This is | |
93 | * useful in cases where the initial hash state is meant to be | |
94 | * secret, e.g., for NMAC and HMAC support. | |
95 | */ | |
96 | ||
97 | void tiger_set(tiger_ctx *ctx, const void *buf, unsigned long count) | |
98 | { | |
99 | const octet *p = buf; | |
45c0fd36 MW |
100 | LOAD64_L_(ctx->a, p + 0); |
101 | LOAD64_L_(ctx->b, p + 8); | |
eeccf7a8 | 102 | LOAD64_L_(ctx->c, p + 16); |
103 | ctx->off = 0; | |
104 | ctx->nl = U32(count); | |
105 | ctx->nh = U32(((count & ~MASK32) >> 16) >> 16); | |
106 | } | |
107 | ||
108 | /* --- @tiger_hash@ --- * | |
109 | * | |
110 | * Arguments: @tiger_ctx *ctx@ = pointer to context block | |
111 | * @const void *buf@ = buffer of data to hash | |
112 | * @size_t sz@ = size of buffer to hash | |
113 | * | |
114 | * Returns: --- | |
115 | * | |
116 | * Use: Hashes a buffer of data. The buffer may be of any size and | |
117 | * alignment. | |
118 | */ | |
119 | ||
120 | void tiger_hash(tiger_ctx *ctx, const void *buf, size_t sz) | |
121 | { | |
122 | HASH_BUFFER(TIGER, tiger, ctx, buf, sz); | |
123 | } | |
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 | void tiger_done(tiger_ctx *ctx, void *hash) | |
136 | { | |
137 | octet *p = hash; | |
138 | HASH_PAD(TIGER, tiger, ctx, 0x01u, 0, 8); | |
139 | STORE32_L(ctx->buf + TIGER_BUFSZ - 8, ctx->nl << 3); | |
140 | STORE32_L(ctx->buf + TIGER_BUFSZ - 4, (ctx->nl >> 29) | (ctx->nh << 3)); | |
141 | tiger_compress(ctx, ctx->buf); | |
142 | STORE64_L_(p + 0, ctx->a); | |
143 | STORE64_L_(p + 8, ctx->b); | |
144 | STORE64_L_(p + 16, ctx->c); | |
145 | } | |
146 | ||
147 | /* --- @tiger_state@ --- * | |
148 | * | |
149 | * Arguments: @tiger_ctx *ctx@ = pointer to context | |
150 | * @void *state@ = pointer to buffer for current state | |
151 | * | |
152 | * Returns: Number of bytes written to the hash function so far. | |
153 | * | |
154 | * Use: Returns the current state of the hash function such that | |
155 | * it can be passed to @tiger_set@. | |
156 | */ | |
157 | ||
158 | unsigned long tiger_state(tiger_ctx *ctx, void *state) | |
159 | { | |
160 | octet *p = state; | |
161 | STORE64_L_(p + 0, ctx->a); | |
162 | STORE64_L_(p + 8, ctx->b); | |
163 | STORE64_L_(p + 16, ctx->c); | |
164 | return (ctx->nl | ((ctx->nh << 16) << 16)); | |
165 | } | |
166 | ||
167 | /* --- Generic interface --- */ | |
168 | ||
169 | GHASH_DEF(TIGER, tiger) | |
170 | ||
171 | /* --- Test code --- */ | |
172 | ||
173 | HASH_TEST(TIGER, tiger) | |
174 | ||
175 | /*----- That's all, folks -------------------------------------------------*/ |