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1 | /* -*-c-*- |
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2 | * |
3 | * Implementation of the SHA-512 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 | |
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28 | /*----- Notes on the SHA-512 hash function --------------------------------* |
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29 | * |
30 | * SHA-1 (Secure Hash Algorithm) was designed by the NSA, for use with the |
31 | * Digital Signature Algorithm. This is an evolution with a larger output |
32 | * size, intended to provide security commensurate with 256-bit AES. At the |
33 | * time of writing, SHA-512 is very new, and can't be trusted too far. There |
34 | * is also a truncated version, SHA-384, which provides security commensurate |
35 | * with 192-bit AES. |
36 | */ |
37 | |
38 | #ifndef CATACOMB_SHA512_H |
39 | #define CATACOMB_SHA512_H |
40 | #define CATACOMB_SHA384_H |
41 | |
42 | #ifdef __cplusplus |
43 | extern "C" { |
44 | #endif |
45 | |
46 | /*----- Header files ------------------------------------------------------*/ |
47 | |
48 | #include <mLib/bits.h> |
49 | |
50 | #ifndef CATACOMB_GHASH_H |
51 | # include "ghash.h" |
52 | #endif |
53 | |
54 | /*----- Magic numbers -----------------------------------------------------*/ |
55 | |
56 | #define SHA512_BUFSZ 128 |
57 | #define SHA512_HASHSZ 64 |
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58 | #define SHA512_STATESZ 64 |
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59 | |
60 | #define SHA384_BUFSZ 128 |
61 | #define SHA384_HASHSZ 48 |
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62 | #define SHA384_STATESZ 64 |
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63 | |
64 | /*----- Data structures ---------------------------------------------------*/ |
65 | |
66 | typedef struct sha512_ctx { |
67 | kludge64 a, b, c, d, e, f, g, h; /* Chaining variables */ |
68 | uint32 nh, nl; /* Byte count so far */ |
69 | unsigned off; /* Offset into buffer */ |
70 | octet buf[SHA512_BUFSZ]; /* Accumulation buffer */ |
71 | } sha512_ctx, sha384_ctx; |
72 | |
73 | /*----- Functions provided ------------------------------------------------*/ |
74 | |
75 | /* --- @sha512_compress@, @sha384_compress@ --- * |
76 | * |
77 | * Arguments: @sha512_ctx *ctx@ = pointer to context block |
78 | * @const void *sbuf@ = pointer to buffer of appropriate size |
79 | * |
80 | * Returns: --- |
81 | * |
82 | * Use: SHA-512 compression function. |
83 | */ |
84 | |
85 | extern void sha512_compress(sha512_ctx */*ctx*/, const void */*sbuf*/); |
86 | #define sha384_compress sha512_compress |
87 | |
88 | /* --- @sha512_init@, @sha384_init@ --- * |
89 | * |
90 | * Arguments: @sha512_ctx *ctx@ = pointer to context block to initialize |
91 | * |
92 | * Returns: --- |
93 | * |
94 | * Use: Initializes a context block ready for hashing. |
95 | */ |
96 | |
97 | extern void sha512_init(sha512_ctx */*ctx*/); |
98 | extern void sha384_init(sha512_ctx */*ctx*/); |
99 | |
100 | /* --- @sha512_set@, @sha384_set@ --- * |
101 | * |
102 | * Arguments: @sha512_ctx *ctx@ = pointer to context block |
103 | * @const void *buf@ = pointer to state buffer |
104 | * @unsigned long count@ = current count of bytes processed |
105 | * |
106 | * Returns: --- |
107 | * |
108 | * Use: Initializes a context block from a given state. This is |
109 | * useful in cases where the initial hash state is meant to be |
110 | * secret, e.g., for NMAC and HMAC support. |
111 | */ |
112 | |
113 | extern void sha512_set(sha512_ctx */*ctx*/, const void */*buf*/, |
114 | unsigned long /*count*/); |
115 | #define sha384_set sha512_set |
116 | |
117 | /* --- @sha512_hash@, @sha384_hash@ --- * |
118 | * |
119 | * Arguments: @sha512_ctx *ctx@ = pointer to context block |
120 | * @const void *buf@ = buffer of data to hash |
121 | * @size_t sz@ = size of buffer to hash |
122 | * |
123 | * Returns: --- |
124 | * |
125 | * Use: Hashes a buffer of data. The buffer may be of any size and |
126 | * alignment. |
127 | */ |
128 | |
129 | extern void sha512_hash(sha512_ctx */*ctx*/, |
130 | const void */*buf*/, size_t /*sz*/); |
131 | #define sha384_hash sha512_hash |
132 | |
133 | /* --- @sha512_done@, @sha384_done@ --- * |
134 | * |
135 | * Arguments: @sha512_ctx *ctx@ = pointer to context block |
136 | * @void *hash@ = pointer to output buffer |
137 | * |
138 | * Returns: --- |
139 | * |
140 | * Use: Returns the hash of the data read so far. |
141 | */ |
142 | |
143 | extern void sha512_done(sha512_ctx */*ctx*/, void */*hash*/); |
144 | extern void sha384_done(sha512_ctx */*ctx*/, void */*hash*/); |
145 | |
146 | /* --- @sha512_state@, @sha384_state@ --- * |
147 | * |
148 | * Arguments: @sha512_ctx *ctx@ = pointer to context |
149 | * @void *state@ = pointer to buffer for current state |
150 | * |
151 | * Returns: Number of bytes written to the hash function so far. |
152 | * |
153 | * Use: Returns the current state of the hash function such that |
154 | * it can be passed to @sha512_set@. |
155 | */ |
156 | |
157 | extern unsigned long sha512_state(sha512_ctx */*ctx*/, void */*state*/); |
158 | #define sha384_state sha512_state |
159 | |
160 | /*----- Generic hash interface --------------------------------------------*/ |
161 | |
162 | extern const gchash sha512; |
163 | extern const gchash sha384; |
164 | |
165 | /*----- That's all, folks -------------------------------------------------*/ |
166 | |
167 | #ifdef __cplusplus |
168 | } |
169 | #endif |
170 | |
171 | #endif |