1/* Auxiliary DKIM functions.
2   Copyright (C) 2007-2021 Sergey Poznyakoff
3
4   This program is free software; you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 3, or (at your option)
7   any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program.  If not, see <http://www.gnu.org/licenses/>. */
16
17module 'dkim'.
18
19#pragma regex push +extended
20
21func dkim_signature_tag(string sig, string tag)
22  returns string
23do
24  if sig matches "(^|;)%tag=([^;]+)"
25    return \2
26  fi
27  switch tag
28  do
29  case 'c':
30    return 'simple/simple'
31  case 'q':
32    return 'dns/txt'
33  case 'i':
34    return '@' . dkim_signature_tag(sig, 'd')
35  done
36  return ""
37done
38
39func dkim_verified_signature_tag(string tag)
40  returns string
41do
42  return dkim_signature_tag(dkim_verified_signature, tag)
43done
44
45#pragma regex pop
46