1/* SHA-1 thunks.
2   Copyright (C) 2019-2022 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
23static const char hex[] = "0123456789abcdef";
24
25char *
26ctf_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}
51