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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: sha.h,v 1.4 2000/06/17 11:32:52 mdw Exp $ |
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4 | * |
5 | * Implementation of the SHA-1 hash function |
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: sha.h,v $ |
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33 | * Revision 1.4 2000/06/17 11:32:52 mdw |
34 | * Change buffer offset to be unsigned. |
35 | * |
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36 | * Revision 1.3 1999/12/10 23:20:03 mdw |
37 | * New hash interface requirements. |
38 | * |
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39 | * Revision 1.2 1999/11/19 13:20:08 mdw |
40 | * Modify notes section slightly. |
41 | * |
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42 | * Revision 1.1 1999/09/03 08:41:12 mdw |
43 | * Initial import. |
44 | * |
45 | */ |
46 | |
47 | /*----- Notes on the SHA-1 hash function ----------------------------------* |
48 | * |
49 | * SHA (Secure Hash Algorithm) was designed by the NSA, for use with the |
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50 | * Digital Signature Algorithm. It is defined by FIPS 180-1. It has gained |
51 | * wide acceptance since its initial publication, and is probably now most |
52 | * people's collision-resistant function of choice. The author prefers |
53 | * RIPEMD-160, for no particularly good reasons. |
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54 | */ |
55 | |
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56 | #ifndef CATACOMB_SHA_H |
57 | #define CATACOMB_SHA_H |
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58 | |
59 | #ifdef __cplusplus |
60 | extern "C" { |
61 | #endif |
62 | |
63 | /*----- Header files ------------------------------------------------------*/ |
64 | |
65 | #include <mLib/bits.h> |
66 | |
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67 | #ifndef CATACOMB_GHASH_H |
68 | # include "ghash.h" |
69 | #endif |
70 | |
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71 | /*----- Magic numbers -----------------------------------------------------*/ |
72 | |
73 | #define SHA_BUFSZ 64 |
74 | #define SHA_HASHSZ 20 |
75 | |
76 | /*----- Data structures ---------------------------------------------------*/ |
77 | |
78 | typedef struct sha_ctx { |
79 | uint32 a, b, c, d, e; /* Chaining variables */ |
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80 | uint32 nl, nh; /* Byte count so far */ |
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81 | unsigned off; /* Offset into buffer */ |
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82 | octet buf[SHA_BUFSZ]; /* Accumulation buffer */ |
83 | } sha_ctx; |
84 | |
85 | /*----- Functions provided ------------------------------------------------*/ |
86 | |
87 | /* --- @sha_compress@ --- * |
88 | * |
89 | * Arguments: @sha_ctx *ctx@ = pointer to context block |
90 | * @const void *sbuf@ = pointer to buffer of appropriate size |
91 | * |
92 | * Returns: --- |
93 | * |
94 | * Use: SHA compression function. |
95 | */ |
96 | |
97 | extern void sha_compress(sha_ctx */*ctx*/, const void */*sbuf*/); |
98 | |
99 | /* --- @sha_init@ --- * |
100 | * |
101 | * Arguments: @sha_ctx *ctx@ = pointer to context block to initialize |
102 | * |
103 | * Returns: --- |
104 | * |
105 | * Use: Initializes a context block ready for hashing. |
106 | */ |
107 | |
108 | extern void sha_init(sha_ctx */*ctx*/); |
109 | |
110 | /* --- @sha_set@ --- * |
111 | * |
112 | * Arguments: @sha_ctx *ctx@ = pointer to context block |
113 | * @const void *buf@ = pointer to state buffer |
114 | * @unsigned long count@ = current count of bytes processed |
115 | * |
116 | * Returns: --- |
117 | * |
118 | * Use: Initializes a context block from a given state. This is |
119 | * useful in cases where the initial hash state is meant to be |
120 | * secret, e.g., for NMAC and HMAC support. |
121 | */ |
122 | |
123 | extern void sha_set(sha_ctx */*ctx*/, const void */*buf*/, |
124 | unsigned long /*count*/); |
125 | |
126 | /* --- @sha_hash@ --- * |
127 | * |
128 | * Arguments: @sha_ctx *ctx@ = pointer to context block |
129 | * @const void *buf@ = buffer of data to hash |
130 | * @size_t sz@ = size of buffer to hash |
131 | * |
132 | * Returns: --- |
133 | * |
134 | * Use: Hashes a buffer of data. The buffer may be of any size and |
135 | * alignment. |
136 | */ |
137 | |
138 | extern void sha_hash(sha_ctx */*ctx*/, const void */*buf*/, size_t /*sz*/); |
139 | |
140 | /* --- @sha_done@ --- * |
141 | * |
142 | * Arguments: @sha_ctx *ctx@ = pointer to context block |
143 | * @void *hash@ = pointer to output buffer |
144 | * |
145 | * Returns: --- |
146 | * |
147 | * Use: Returns the hash of the data read so far. |
148 | */ |
149 | |
150 | extern void sha_done(sha_ctx */*ctx*/, void */*hash*/); |
151 | |
152 | /* --- @sha_state@ --- * |
153 | * |
154 | * Arguments: @sha_ctx *ctx@ = pointer to context |
155 | * @void *state@ = pointer to buffer for current state |
156 | * |
157 | * Returns: Number of bytes written to the hash function so far. |
158 | * |
159 | * Use: Returns the current state of the hash function such that |
160 | * it can be passed to @sha_set@. |
161 | */ |
162 | |
163 | extern unsigned long sha_state(sha_ctx */*ctx*/, void */*state*/); |
164 | |
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165 | /*----- Generic hash interface --------------------------------------------*/ |
166 | |
167 | extern const gchash sha; |
168 | |
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169 | /*----- That's all, folks -------------------------------------------------*/ |
170 | |
171 | #ifdef __cplusplus |
172 | } |
173 | #endif |
174 | |
175 | #endif |