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1 | /* SHA-1 thunks. |
2 | Copyright (C) 2019 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of libctf. | |
5 | ||
6 | libctf is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 3, or (at your option) any later | |
9 | version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
14 | See the GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; see the file COPYING. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <ctf-impl.h> | |
21 | #include <ctf-sha1.h> | |
22 | ||
23 | static const char hex[] = "0123456789abcdef"; | |
24 | ||
25 | char * | |
26 | ctf_sha1_fini (ctf_sha1_t *sha1, char *buf) | |
27 | { | |
28 | size_t i; | |
29 | ||
30 | /* Alignment suitable for a uint32_t. */ | |
31 | union | |
32 | { | |
33 | uint32_t align; | |
34 | unsigned char digest[((CTF_SHA1_SIZE - 1) / 2) + 1]; | |
35 | } align; | |
36 | ||
37 | sha1_finish_ctx (sha1, align.digest); | |
38 | ||
39 | if (!buf) | |
40 | return NULL; | |
41 | ||
42 | buf[CTF_SHA1_SIZE - 1] = '\0'; | |
43 | ||
44 | for (i = 0; i < (CTF_SHA1_SIZE - 1) / 2; i++) | |
45 | { | |
46 | buf[2 * i] = hex[align.digest[i] >> 4]; | |
47 | buf[2 * i + 1] = hex[align.digest[i] & 0xf]; | |
48 | } | |
49 | return buf; | |
50 | } |