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10427eb2 MW |
1 | /* -*-c-*- |
2 | * | |
3 | * The SHA256 hash function | |
4 | * | |
5 | * (c) 2020 Mark Wooding | |
6 | */ | |
7 | ||
8 | /*----- Licensing notice --------------------------------------------------* | |
9 | * | |
10 | * This file is part of Runlisp, a tool for invoking Common Lisp scripts. | |
11 | * | |
12 | * Runlisp is free software: you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License as published by the | |
14 | * Free Software Foundation; either version 3 of the License, or (at your | |
15 | * option) any later version. | |
16 | * | |
17 | * Runlisp is distributed in the hope that it will be useful, but WITHOUT | |
18 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
19 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
20 | * for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with Runlisp. If not, see <https://www.gnu.org/licenses/>. | |
24 | */ | |
25 | ||
26 | #ifndef SHA256_H | |
27 | #define SHA256_H | |
28 | ||
29 | #ifdef __cplusplus | |
30 | extern "C" { | |
31 | #endif | |
32 | ||
33 | /*----- Header files ------------------------------------------------------*/ | |
34 | ||
35 | #include <limits.h> | |
36 | ||
37 | /*----- Data types --------------------------------------------------------*/ | |
38 | ||
39 | /* Select a suitable type for 32-bit words. */ | |
40 | #if UINT_MAX >= 0xffffffff | |
41 | typedef unsigned u32; | |
42 | #else | |
43 | typedef unsigned long u32; | |
44 | #endif | |
45 | ||
46 | #define SHA256_BLKSZ 64 /* input block size in bytes */ | |
47 | #define SHA256_HASHSZ 32 /* output hash size in bytes */ | |
48 | ||
49 | struct sha256_state { | |
50 | unsigned n; /* number of live bytes in buffer */ | |
51 | size_t nblk; /* number of blocks hashed so far */ | |
52 | u32 a[8]; /* hash state */ | |
53 | unsigned char buf[SHA256_BLKSZ]; /* input buffer */ | |
54 | }; | |
55 | ||
56 | /*----- Functions provided ------------------------------------------------*/ | |
57 | ||
58 | extern void sha256_init(struct sha256_state */**/); | |
59 | /* Initialize the hash state S. */ | |
60 | ||
61 | extern void sha256_hash(struct sha256_state */*s*/, | |
62 | const void */*m*/, size_t /*sz*/); | |
63 | /* Append SZ bytes of data starting at M to the hash state S. */ | |
64 | ||
65 | extern void sha256_done(struct sha256_state */*s*/, unsigned char */*h*/); | |
66 | /* Write the final hash of state S to buffer H. */ | |
67 | ||
68 | /*----- That's all, folks -------------------------------------------------*/ | |
69 | ||
70 | #ifdef __cplusplus | |
71 | } | |
72 | #endif | |
73 | ||
74 | #endif |