| 1 |
root |
1.1 |
=head1 NAME |
| 2 |
|
|
|
| 3 |
|
|
Net::FCP::Key::CHK - manage CHK keys. |
| 4 |
|
|
|
| 5 |
|
|
=head1 SYNOPSIS |
| 6 |
|
|
|
| 7 |
|
|
use Net::FCP::Key::CHK; |
| 8 |
|
|
|
| 9 |
|
|
my $key = new Net::FCP::Key::CHK; |
| 10 |
|
|
my $key = new_from_uri Net::FCP::Key::CHK $uri; |
| 11 |
|
|
my $key = new_from_data Net::FCP::Key::CHK $data, $metadata; |
| 12 |
|
|
... more to come |
| 13 |
|
|
|
| 14 |
|
|
|
| 15 |
|
|
=head1 DESCRIPTION |
| 16 |
|
|
|
| 17 |
|
|
=back |
| 18 |
|
|
|
| 19 |
|
|
=head2 THE Net::FCP::Key::CHK CLASS |
| 20 |
|
|
|
| 21 |
|
|
=over 4 |
| 22 |
|
|
|
| 23 |
|
|
=cut |
| 24 |
|
|
|
| 25 |
|
|
package Net::FCP::Key::CHK; |
| 26 |
|
|
|
| 27 |
|
|
use Carp; |
| 28 |
|
|
use Digest::SHA1; |
| 29 |
|
|
use Crypt::Twofish2; |
| 30 |
|
|
use MIME::Base64; |
| 31 |
|
|
|
| 32 |
|
|
no warnings; |
| 33 |
|
|
|
| 34 |
|
|
sub log2($$) { # n, minlog |
| 35 |
|
|
my ($n, $b) = @_; |
| 36 |
|
|
|
| 37 |
|
|
$b++ while 1 << $b < $n; |
| 38 |
|
|
|
| 39 |
|
|
$b; |
| 40 |
|
|
} |
| 41 |
|
|
|
| 42 |
|
|
sub decode_fbase64 { |
| 43 |
|
|
my $s = shift; |
| 44 |
|
|
|
| 45 |
|
|
$s =~ y%~\-%+/%; |
| 46 |
|
|
decode_base64 "$s======"; |
| 47 |
|
|
} |
| 48 |
|
|
|
| 49 |
|
|
sub encode_fbase64 { |
| 50 |
|
|
my $s = encode_base64 shift, ""; |
| 51 |
|
|
$s =~ s/=+$//; |
| 52 |
|
|
$s =~ y%+/%~\-%; |
| 53 |
|
|
$s; |
| 54 |
|
|
} |
| 55 |
|
|
|
| 56 |
|
|
=item my $key = new Net::FCP::Key::CHK; |
| 57 |
|
|
|
| 58 |
|
|
Don't use :) |
| 59 |
|
|
|
| 60 |
|
|
=cut |
| 61 |
|
|
|
| 62 |
|
|
sub new { |
| 63 |
|
|
my $class = shift; |
| 64 |
|
|
|
| 65 |
|
|
bless { }, $class; |
| 66 |
|
|
} |
| 67 |
|
|
|
| 68 |
|
|
=item my $key = new_from_date Net::FCP::Key::CHK $data, $metadata; |
| 69 |
|
|
|
| 70 |
|
|
Generate a CHK from the given data and metadata strings. |
| 71 |
|
|
|
| 72 |
|
|
=cut |
| 73 |
|
|
|
| 74 |
|
|
sub new_from_data { |
| 75 |
|
|
my ($class, $data, $metadata) = @_; |
| 76 |
|
|
|
| 77 |
|
|
$class->new->set_data ($data, $metadata); |
| 78 |
|
|
} |
| 79 |
|
|
|
| 80 |
|
|
sub set_data { |
| 81 |
|
|
my ($self, $data, $metadata) = @_; |
| 82 |
|
|
|
| 83 |
|
|
my $d = new Digest::SHA1; |
| 84 |
|
|
$d->add ($metadata); |
| 85 |
|
|
$d->add ($data); |
| 86 |
|
|
$d = $d->digest; |
| 87 |
|
|
|
| 88 |
|
|
# only works for 128 bit keys |
| 89 |
|
|
my $k = new Digest::SHA1; |
| 90 |
|
|
$k->add ("\x00" x 1); |
| 91 |
|
|
$k->add ($d); |
| 92 |
|
|
} |
| 93 |
|
|
|
| 94 |
|
|
=item $size = $key->size |
| 95 |
|
|
|
| 96 |
|
|
Returns the size of the data (in bytes). |
| 97 |
|
|
|
| 98 |
|
|
=cut |
| 99 |
|
|
|
| 100 |
|
|
=item $digest = $key->digest |
| 101 |
|
|
|
| 102 |
|
|
Return the store digest/hash. |
| 103 |
|
|
|
| 104 |
|
|
=cut |
| 105 |
|
|
|
| 106 |
|
|
=item $keynum = $key->keynumber |
| 107 |
|
|
|
| 108 |
|
|
Returns the keynumber (version?) |
| 109 |
|
|
|
| 110 |
|
|
=cut |
| 111 |
|
|
|
| 112 |
|
|
=item $chk = $key->chk |
| 113 |
|
|
|
| 114 |
|
|
Return the full CHK. |
| 115 |
|
|
|
| 116 |
|
|
=cut |
| 117 |
|
|
|
| 118 |
|
|
=back |
| 119 |
|
|
|
| 120 |
|
|
=head1 SEE ALSO |
| 121 |
|
|
|
| 122 |
|
|
L<Net::FCP>. |
| 123 |
|
|
|
| 124 |
|
|
=head1 BUGS |
| 125 |
|
|
|
| 126 |
|
|
Not heavily tested. |
| 127 |
|
|
|
| 128 |
|
|
=head1 AUTHOR |
| 129 |
|
|
|
| 130 |
|
|
Marc Lehmann <pcg@goof.com> |
| 131 |
|
|
http://www.goof.com/pcg/marc/ |
| 132 |
|
|
|
| 133 |
|
|
=cut |
| 134 |
|
|
|
| 135 |
|
|
1; |
| 136 |
|
|
|
