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=head1 NAME |
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|
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Net::FCP::Key::CHK - manage CHK keys. |
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|
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=head1 SYNOPSIS |
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|
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use Net::FCP::Key::CHK; |
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|
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my $key = new Net::FCP::Key::CHK; |
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my $key = new_from_uri Net::FCP::Key::CHK $uri; |
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my $key = new_from_data Net::FCP::Key::CHK $data, $metadata; |
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... more to come |
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|
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|
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=head1 DESCRIPTION |
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|
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=back |
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|
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=head2 THE Net::FCP::Key::CHK CLASS |
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|
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=over 4 |
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|
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=cut |
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|
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package Net::FCP::Key::CHK; |
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|
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use Carp; |
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use Digest::SHA1; |
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use Crypt::Twofish2; |
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use MIME::Base64; |
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|
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no warnings; |
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|
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sub log2($$) { # n, minlog |
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my ($n, $b) = @_; |
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|
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$b++ while 1 << $b < $n; |
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|
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$b; |
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} |
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|
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sub decode_fbase64 { |
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my $s = shift; |
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|
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$s =~ y%~\-%+/%; |
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decode_base64 "$s======"; |
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} |
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|
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sub encode_fbase64 { |
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my $s = encode_base64 shift, ""; |
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$s =~ s/=+$//; |
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$s =~ y%+/%~\-%; |
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$s; |
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} |
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|
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=item my $key = new Net::FCP::Key::CHK; |
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|
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Don't use :) |
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|
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=cut |
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|
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sub new { |
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my $class = shift; |
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|
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bless { }, $class; |
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} |
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|
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=item my $key = new_from_date Net::FCP::Key::CHK $data, $metadata; |
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|
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Generate a CHK from the given data and metadata strings. |
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|
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=cut |
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|
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sub new_from_data { |
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my ($class, $data, $metadata) = @_; |
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|
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$class->new->set_data ($data, $metadata); |
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} |
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|
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sub set_data { |
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my ($self, $data, $metadata) = @_; |
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|
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my $d = new Digest::SHA1; |
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$d->add ($metadata); |
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$d->add ($data); |
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$d = $d->digest; |
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|
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# only works for 128 bit keys |
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my $k = new Digest::SHA1; |
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$k->add ("\x00" x 1); |
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$k->add ($d); |
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} |
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|
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=item $size = $key->size |
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|
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Returns the size of the data (in bytes). |
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|
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=cut |
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|
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=item $digest = $key->digest |
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|
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Return the store digest/hash. |
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|
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=cut |
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|
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=item $keynum = $key->keynumber |
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|
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Returns the keynumber (version?) |
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|
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=cut |
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|
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=item $chk = $key->chk |
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|
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Return the full CHK. |
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|
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=cut |
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|
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=back |
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|
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=head1 SEE ALSO |
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|
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L<Net::FCP>. |
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|
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=head1 BUGS |
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|
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Not heavily tested. |
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|
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=head1 AUTHOR |
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|
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Marc Lehmann <pcg@goof.com> |
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http://www.goof.com/pcg/marc/ |
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|
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=cut |
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|
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1; |
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