File Coverage

blib/lib/Crypt/OpenPGP/Cipher.pm

Criterion	Covered	Total	%
statement	130	162	80.2
branch	11	18	61.1
condition	1	3	33.3
subroutine	52	66	78.7
pod	5	8	62.5
total	199	257	77.4

package Crypt::OpenPGP::Cipher;
use strict;

use Crypt::OpenPGP::CFB;
use Crypt::OpenPGP::ErrorHandler;
use base qw( Crypt::OpenPGP::ErrorHandler );

use vars qw( %ALG %ALG_BY_NAME );
%ALG = (
    1 => 'IDEA',
    2 => 'DES3',
    3 => 'CAST5',
    4 => 'Blowfish',
    7 => 'Rijndael',
    8 => 'Rijndael192',
    9 => 'Rijndael256',
    10 => 'Twofish',
);
%ALG_BY_NAME = map { $ALG{$_} => $_ } keys %ALG;

sub new {
    my $class = shift;
    my $alg = shift;
    $alg = $ALG{$alg} || $alg;
    return $class->error("Unsupported cipher algorithm '$alg'")
        unless $alg =~ /^\D/;
    my $pkg = join '::', $class, $alg;
    my $ciph = bless { __alg => $alg,
                       __alg_id => $ALG_BY_NAME{$alg} }, $pkg;
    my $impl_class = $ciph->crypt_class;
    my @classes = ref($impl_class) eq 'ARRAY' ? @$impl_class : ($impl_class);
    for my $c (@classes) {
        eval "use $c;";
        $ciph->{__impl} = $c, last unless $@;
    }
    return $class->error("Error loading cipher implementation for " .
                         "'$alg': no implementations installed.")
        unless $ciph->{__impl};
    $ciph->init(@_);
}

sub init {
    my $ciph = shift;
    my($key, $iv) = @_;
    if ($key) {
        my $class = $ciph->{__impl};
        ## Make temp variable, because Rijndael checks SvPOK, which
        ## doesn't seem to like a value that isn't a variable?
        my $tmp = substr $key, 0, $ciph->keysize;
        my $c = $class->new($tmp);
        $ciph->{cipher} = Crypt::OpenPGP::CFB->new($c, $iv);
    }
    $ciph;
}

sub encrypt { $_[0]->{cipher}->encrypt($_[1]) }
sub decrypt { $_[0]->{cipher}->decrypt($_[1]) }

sub sync { $_[0]->{cipher}->sync }

sub alg { $_[0]->{__alg} }
sub alg_id {
    return $_[0]->{__alg_id} if ref($_[0]);
    $ALG_BY_NAME{$_[1]} || $_[1];
}
sub supported {
    my $class = shift;
    my %s;
    for my $cid (keys %ALG) {
        my $cipher = $class->new($cid);
        $s{$cid} = $cipher->alg if $cipher;
    }
    \%s;
}

package Crypt::OpenPGP::Cipher::IDEA;
use strict;
use base qw( Crypt::OpenPGP::Cipher );

sub init {
    my $ciph = shift;
    my($key, $iv) = @_;
    if ($key) {
        my $c = IDEA->new(substr($key, 0, $ciph->keysize));
        $ciph->{cipher} = Crypt::OpenPGP::CFB->new($c, $iv);
    }
    $ciph;
}

sub crypt_class { 'Crypt::IDEA' }
sub keysize { 16 }
sub blocksize { 8 }

package Crypt::OpenPGP::Cipher::Blowfish;
use strict;
use base qw( Crypt::OpenPGP::Cipher );

sub crypt_class { 'Crypt::Blowfish' }
sub keysize { 16 }
sub blocksize { 8 }

package Crypt::OpenPGP::Cipher::DES3;
use strict;
use base qw( Crypt::OpenPGP::Cipher );

sub crypt_class { 'Crypt::DES_EDE3' }
sub keysize { 24 }
sub blocksize { 8 }

package Crypt::OpenPGP::Cipher::CAST5;
use strict;
use base qw( Crypt::OpenPGP::Cipher );

sub crypt_class { 'Crypt::CAST5_PP' }
sub keysize { 16 }
sub blocksize { 8 }

package Crypt::OpenPGP::Cipher::Twofish;
use strict;
use base qw( Crypt::OpenPGP::Cipher );

sub crypt_class { 'Crypt::Twofish' }
sub keysize { 32 }
sub blocksize { 16 }

package Crypt::OpenPGP::Cipher::Rijndael;
use strict;
use base qw( Crypt::OpenPGP::Cipher );

sub crypt_class { 'Crypt::Rijndael' }
sub keysize { 16 }
sub blocksize { 16 }

package Crypt::OpenPGP::Cipher::Rijndael192;
use strict;
use base qw( Crypt::OpenPGP::Cipher );

sub crypt_class { 'Crypt::Rijndael' }
sub keysize { 24 }
sub blocksize { 16 }

package Crypt::OpenPGP::Cipher::Rijndael256;
use strict;
use base qw( Crypt::OpenPGP::Cipher );

sub crypt_class { 'Crypt::Rijndael' }
sub keysize { 32 }
sub blocksize { 16 }

1;
__END__