/usr/share/perl5/RDF/Crypt/Decrypter.pm is in librdf-crypt-perl 0.002-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 | package RDF::Crypt::Decrypter;
use 5.010;
use Any::Moose;
with qw(
RDF::Crypt::Role::WithPrivateKey
RDF::Crypt::Role::DoesDecrypt
RDF::Crypt::Role::DoesEncrypt
RDF::Crypt::Role::ToString
);
use MIME::Base64 qw(
decode_base64
encode_base64
);
use namespace::clean;
BEGIN {
$RDF::Crypt::Decrypter::AUTHORITY = 'cpan:TOBYINK';
$RDF::Crypt::Decrypter::VERSION = '0.002';
}
sub decrypt_bytes
{
my ($self, $text) = @_;
$text = decode_base64($text);
my $key = $self->private_key;
my $block_size = $key->size - 16;
my $iv = substr($text, 0, $block_size);
my $removal_chars = unpack('n', substr($text, $block_size, 2));
my $scrambled = substr($text, $block_size + 2);
$text = '';
my $v = $iv;
while (length $scrambled)
{
my $block = substr($scrambled, 0, $key->size);
$scrambled = substr($scrambled, length $block);
if (length $block < $block_size)
{
$v = substr($v, 0, length $block);
}
my $clear = $key->decrypt($block);
my $unxor = "$clear" ^ "$v";
$v = $block;
$text .= substr($unxor, 0, $block_size);
}
return substr($text, 0, (length $text) - $removal_chars);
}
sub encrypt_bytes
{
my ($self, $text) = @_;
encode_base64(
$self->private_key->private_encrypt($text)
);
}
1;
__END__
=head1 NAME
RDF::Crypt::Decrypter - decrypts encrypted RDF graphs
=head1 SYNOPSIS
use 5.010;
use File::Slurp qw< slurp >;
use RDF::Crypt::Decrypter;
my $dec = RDF::Crypt::Decrypter->new_from_file(
'/path/to/private-key.pem'
);
my $scrambled = slurp '/path/to/secret.rdf-crypt';
my $graph = $dec->decrypt_model($scrambled);
=head1 DESCRIPTION
A Decrypter object is created using an RSA private key.
RDF::Crypt::Decrypter can also also be used to encrypt graphs for yourself,
using just your private key.
=head2 Roles
=over
=item * L<RDF::Crypt::Role::WithPublicKeys>
=item * L<RDF::Crypt::Role::DoesDecrypt>
=item * L<RDF::Crypt::Role::DoesEncrypt>
=item * L<RDF::Crypt::Role::ToString>
=back
=begin trustme
=item * encrypt_bytes
=item * decrypt_bytes
=end trustme
=head1 SEE ALSO
L<RDF::Crypt>,
L<RDF::Crypt::Encrypter>.
=head1 BUGS
Please report any bugs to L<http://rt.cpan.org/>.
=head1 AUTHOR
Toby Inkster E<lt>tobyink@cpan.orgE<gt>.
=head1 COPYRIGHT
Copyright 2010, 2012 Toby Inkster
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
=head1 DISCLAIMER OF WARRANTIES
THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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