#!/usr/bin/perl

################################################################
#
# Copyright (c) 1995-2014 SUSE Linux Products GmbH
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or 3 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program (see the file COPYING); if not, write to the
# Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
#
################################################################

# simple "sign" replacement that does nothing but
# write a 2048 byte file with a fixed signature.
# sign is used in kiwi builds to sign repositories

my $mode;

while (@ARGV) {
  if ($ARGV[0] =~ /^-([cdrp])$/) {
    $mode = $1;
    shift @ARGV;
    next;
  }
  if ($ARGV[0] eq '--') {
    shift @ARGV;
    last;
  }
  if ($ARGV[0] =~ /^-/) {
    die("unsupported option $ARGV[0]\n");
  }
  last;
}
if ($mode eq 'p') {
  my $block = "sIGnMeP\n";
  $block .= "\0" x (8192 - length($block));
  (syswrite(STDOUT, $block) || 0) == 8192 || die("pubkey write: $!\n");
  exit 0;
}
die("only detached mode possible\n") if !$mode || $mode ne 'd';
die("filter mode not supported\n") unless @ARGV;

for my $file (@ARGV) {
  local *F;
  open(F, '<', $file) || die("$file: $!\n");
  my $buf = '';
  1 while sysread(F, $buf, 16384, length($buf));
  close(F) || die("$file: $!\n");
  my $block = "sIGnMe!\n";
  $block .= sprintf("%08x%08x\n", length($buf), unpack("%32C*", $buf));
  $block .= "\0" x (2048 - length($block));
  open(F, '>', "$file.asc") || die("$file.asc: $!\n");
  (syswrite(F, $block) || 0) == 2048 || die("$file.asc: $!\n");
  close(F) || die("$file.asc: $!\n");
}