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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: ghash-def.h,v 1.4 2000/07/15 10:00:58 mdw Exp $ |
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4 | * |
5 | * Definitions for generic hash interface |
6 | * |
7 | * (c) 1999 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: ghash-def.h,v $ |
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33 | * Revision 1.4 2000/07/15 10:00:58 mdw |
34 | * New generic hash operation for copying hash contexts. |
35 | * |
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36 | * Revision 1.3 2000/07/02 18:27:42 mdw |
37 | * (ghash->ops->done): Interface change. Passing in a null buffer pointer |
38 | * uses a buffer internal to the ghash object. The operation returns the |
39 | * address of the buffer it used. Clients of generic hashes no longer need |
40 | * to use dynamically allocated memory for hash results. |
41 | * |
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42 | * Revision 1.2 2000/06/17 11:22:03 mdw |
43 | * Use secure arena for memory allocation. Minor changes in the generic |
44 | * hash interface. |
45 | * |
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46 | * Revision 1.1 1999/12/10 23:21:37 mdw |
47 | * Generic interface. |
48 | * |
49 | */ |
50 | |
51 | #ifndef CATACOMB_GHASH_DEF_H |
52 | #define CATACOMB_GHASH_DEF_H |
53 | |
54 | #ifdef __cplusplus |
55 | extern "C" { |
56 | #endif |
57 | |
58 | /*----- Header files ------------------------------------------------------*/ |
59 | |
60 | #include <mLib/bits.h> |
61 | #include <mLib/sub.h> |
62 | |
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63 | #ifndef CATACOMB_ARENA_H |
64 | # include "arena.h" |
65 | #endif |
66 | |
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67 | #ifndef CATACOMB_GHASH_H |
68 | # include "ghash.h" |
69 | #endif |
70 | |
71 | /*----- Generic hash function interface -----------------------------------*/ |
72 | |
73 | /* --- @GHASH_DEF@ --- * |
74 | * |
75 | * Arguments: @PRE, pre@ = prefixes for hash function |
76 | * |
77 | * Use: Defines the generic hash instance. |
78 | */ |
79 | |
80 | #define GHASH_DEF(PRE, pre) \ |
81 | \ |
82 | static const ghash_ops gops; \ |
83 | \ |
84 | typedef struct gctx { \ |
85 | ghash h; \ |
86 | pre##_ctx c; \ |
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87 | octet buf[PRE##_HASHSZ]; \ |
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88 | } gctx; \ |
89 | \ |
90 | static ghash *ghinit(void) \ |
91 | { \ |
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92 | gctx *g = S_CREATE(gctx); \ |
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93 | g->h.ops = &gops; \ |
94 | pre##_init(&g->c); \ |
95 | return (&g->h); \ |
96 | } \ |
97 | \ |
98 | static void ghhash(ghash *h, const void *p, size_t sz) \ |
99 | { \ |
100 | gctx *g = (gctx *)h; \ |
101 | pre##_hash(&g->c, p, sz); \ |
102 | } \ |
103 | \ |
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104 | static octet *ghdone(ghash *h, void *buf) \ |
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105 | { \ |
106 | gctx *g = (gctx *)h; \ |
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107 | if (!buf) \ |
108 | buf = g->buf; \ |
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109 | pre##_done(&g->c, buf); \ |
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110 | return (buf); \ |
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111 | } \ |
112 | \ |
113 | static void ghdestroy(ghash *h) \ |
114 | { \ |
115 | gctx *g = (gctx *)h; \ |
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116 | S_DESTROY(g); \ |
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117 | } \ |
118 | \ |
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119 | static ghash *ghcopy(ghash *h) \ |
120 | { \ |
121 | gctx *g = (gctx *)h; \ |
122 | gctx *gg = S_CREATE(gctx); \ |
123 | memcpy(gg, g, sizeof(gctx)); \ |
124 | return (&gg->h); \ |
125 | } \ |
126 | \ |
127 | static const ghash_ops gops = \ |
128 | { &pre, ghhash, ghdone, ghdestroy, ghcopy }; \ |
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129 | const gchash pre = { #pre, PRE##_HASHSZ, ghinit }; |
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130 | |
131 | /*----- That's all, folks -------------------------------------------------*/ |
132 | |
133 | #ifdef __cplusplus |
134 | } |
135 | #endif |
136 | |
137 | #endif |