File Coverage

blib/lib/Net/SSH/Perl/Cipher/Blowfish.pm

Criterion	Covered	Total	%
statement	36	38	94.7
branch	5	10	50.0
condition			n/a
subroutine	11	13	84.6
pod	3	6	50.0
total	55	67	82.0

# $Id: Blowfish.pm,v 1.14 2001/05/08 02:55:40 btrott Exp $

package Net::SSH::Perl::Cipher::Blowfish;

use strict;
use warnings;

use Net::SSH::Perl::Cipher;
use base qw( Net::SSH::Perl::Cipher );

use Crypt::Cipher::Blowfish;
use Net::SSH::Perl::Cipher::CBC;

sub new {
    my $class = shift;
    my $ciph = bless { }, $class;
    $ciph->init(@_) if @_;
    $ciph;
}

sub keysize { 16 }
sub blocksize { 8 }

sub init {
    my $ciph = shift;
    my($key, $iv, $is_ssh2) = @_;
    $key = substr($key, 0, 16);
    my $blow = Crypt::Cipher::Blowfish->new($key);
    $ciph->{cbc} = Net::SSH::Perl::Cipher::CBC->new($blow,
        $iv ? substr($iv, 0, 8) : undef);
    $ciph->{is_ssh2} = defined $is_ssh2 ? $is_ssh2 : 0;
}

sub encrypt {
    my($ciph, $text) = @_;
    $ciph->{is_ssh2} ?
        $ciph->{cbc}->encrypt($text) :
        _swap_bytes($ciph->{cbc}->encrypt(_swap_bytes($text)));
}

sub decrypt {
    my($ciph, $text) = @_;
    $ciph->{is_ssh2} ?
        $ciph->{cbc}->decrypt($text) :
        _swap_bytes($ciph->{cbc}->decrypt(_swap_bytes($text)));
}

sub _swap_bytes {
    my $str = $_[0];
    $str =~ s/(.{4})/reverse $1/sge;
    $str;
}

1;
__END__