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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: sha512.h,v 1.3 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * Implementation of the SHA-512 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 | |
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30 | /*----- Notes on the SHA-512 hash function ----------------------------------* |
31 | * |
32 | * SHA-1 (Secure Hash Algorithm) was designed by the NSA, for use with the |
33 | * Digital Signature Algorithm. This is an evolution with a larger output |
34 | * size, intended to provide security commensurate with 256-bit AES. At the |
35 | * time of writing, SHA-512 is very new, and can't be trusted too far. There |
36 | * is also a truncated version, SHA-384, which provides security commensurate |
37 | * with 192-bit AES. |
38 | */ |
39 | |
40 | #ifndef CATACOMB_SHA512_H |
41 | #define CATACOMB_SHA512_H |
42 | #define CATACOMB_SHA384_H |
43 | |
44 | #ifdef __cplusplus |
45 | extern "C" { |
46 | #endif |
47 | |
48 | /*----- Header files ------------------------------------------------------*/ |
49 | |
50 | #include <mLib/bits.h> |
51 | |
52 | #ifndef CATACOMB_GHASH_H |
53 | # include "ghash.h" |
54 | #endif |
55 | |
56 | /*----- Magic numbers -----------------------------------------------------*/ |
57 | |
58 | #define SHA512_BUFSZ 128 |
59 | #define SHA512_HASHSZ 64 |
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60 | #define SHA512_STATESZ 64 |
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61 | |
62 | #define SHA384_BUFSZ 128 |
63 | #define SHA384_HASHSZ 48 |
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64 | #define SHA384_STATESZ 64 |
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65 | |
66 | /*----- Data structures ---------------------------------------------------*/ |
67 | |
68 | typedef struct sha512_ctx { |
69 | kludge64 a, b, c, d, e, f, g, h; /* Chaining variables */ |
70 | uint32 nh, nl; /* Byte count so far */ |
71 | unsigned off; /* Offset into buffer */ |
72 | octet buf[SHA512_BUFSZ]; /* Accumulation buffer */ |
73 | } sha512_ctx, sha384_ctx; |
74 | |
75 | /*----- Functions provided ------------------------------------------------*/ |
76 | |
77 | /* --- @sha512_compress@, @sha384_compress@ --- * |
78 | * |
79 | * Arguments: @sha512_ctx *ctx@ = pointer to context block |
80 | * @const void *sbuf@ = pointer to buffer of appropriate size |
81 | * |
82 | * Returns: --- |
83 | * |
84 | * Use: SHA-512 compression function. |
85 | */ |
86 | |
87 | extern void sha512_compress(sha512_ctx */*ctx*/, const void */*sbuf*/); |
88 | #define sha384_compress sha512_compress |
89 | |
90 | /* --- @sha512_init@, @sha384_init@ --- * |
91 | * |
92 | * Arguments: @sha512_ctx *ctx@ = pointer to context block to initialize |
93 | * |
94 | * Returns: --- |
95 | * |
96 | * Use: Initializes a context block ready for hashing. |
97 | */ |
98 | |
99 | extern void sha512_init(sha512_ctx */*ctx*/); |
100 | extern void sha384_init(sha512_ctx */*ctx*/); |
101 | |
102 | /* --- @sha512_set@, @sha384_set@ --- * |
103 | * |
104 | * Arguments: @sha512_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 sha512_set(sha512_ctx */*ctx*/, const void */*buf*/, |
116 | unsigned long /*count*/); |
117 | #define sha384_set sha512_set |
118 | |
119 | /* --- @sha512_hash@, @sha384_hash@ --- * |
120 | * |
121 | * Arguments: @sha512_ctx *ctx@ = pointer to context block |
122 | * @const void *buf@ = buffer of data to hash |
123 | * @size_t sz@ = size of buffer to hash |
124 | * |
125 | * Returns: --- |
126 | * |
127 | * Use: Hashes a buffer of data. The buffer may be of any size and |
128 | * alignment. |
129 | */ |
130 | |
131 | extern void sha512_hash(sha512_ctx */*ctx*/, |
132 | const void */*buf*/, size_t /*sz*/); |
133 | #define sha384_hash sha512_hash |
134 | |
135 | /* --- @sha512_done@, @sha384_done@ --- * |
136 | * |
137 | * Arguments: @sha512_ctx *ctx@ = pointer to context block |
138 | * @void *hash@ = pointer to output buffer |
139 | * |
140 | * Returns: --- |
141 | * |
142 | * Use: Returns the hash of the data read so far. |
143 | */ |
144 | |
145 | extern void sha512_done(sha512_ctx */*ctx*/, void */*hash*/); |
146 | extern void sha384_done(sha512_ctx */*ctx*/, void */*hash*/); |
147 | |
148 | /* --- @sha512_state@, @sha384_state@ --- * |
149 | * |
150 | * Arguments: @sha512_ctx *ctx@ = pointer to context |
151 | * @void *state@ = pointer to buffer for current state |
152 | * |
153 | * Returns: Number of bytes written to the hash function so far. |
154 | * |
155 | * Use: Returns the current state of the hash function such that |
156 | * it can be passed to @sha512_set@. |
157 | */ |
158 | |
159 | extern unsigned long sha512_state(sha512_ctx */*ctx*/, void */*state*/); |
160 | #define sha384_state sha512_state |
161 | |
162 | /*----- Generic hash interface --------------------------------------------*/ |
163 | |
164 | extern const gchash sha512; |
165 | extern const gchash sha384; |
166 | |
167 | /*----- That's all, folks -------------------------------------------------*/ |
168 | |
169 | #ifdef __cplusplus |
170 | } |
171 | #endif |
172 | |
173 | #endif |