package Crypt::Blowfish; require Exporter; require DynaLoader; use vars qw($VERSION @ISA @EXPORT @EXPORT_OK); @ISA = qw(Exporter DynaLoader); # @ISA = qw(Exporter DynaLoader Crypt::BlockCipher); # Items to export into callers namespace by default @EXPORT = qw(); # Other items we are prepared to export if requested @EXPORT_OK = qw( blocksize keysize min_keysize max_keysize new encrypt decrypt ); $VERSION = '2.14'; bootstrap Crypt::Blowfish $VERSION; use strict; use Carp; sub usage { my ($package, $filename, $line, $subr) = caller(1); $Carp::CarpLevel = 2; croak "Usage: $subr(@_)"; } sub blocksize { 8; } # /* byte my shiny metal.. */ sub keysize { 0; } # /* we'll leave this at 8 .. for now. */ sub min_keysize { 8; } sub max_keysize { 56; } sub new { usage("new Blowfish key") unless @_ == 2; my $type = shift; my $self = {}; bless $self, $type; $self->{'ks'} = Crypt::Blowfish::init(shift); return $self; } sub encrypt { usage("encrypt data[8 bytes]") unless @_ == 2; my ($self,$data) = @_; Crypt::Blowfish::crypt($data, $data, $self->{'ks'}, 0); return $data; } sub decrypt { usage("decrypt data[8 bytes]") unless @_ == 2; my ($self,$data) = @_; Crypt::Blowfish::crypt($data, $data, $self->{'ks'}, 1); return $data; } 1; __END__ # # Parts Copyright (C) 1995, 1996 Systemics Ltd (http://www.systemics.com/) # New Parts Copyright (C) 1999, 2001 W3Works, LLC (http://www.w3works.com/) # All rights reserved. # =head1 NAME Crypt::Blowfish - Perl Blowfish encryption module =head1 SYNOPSIS use Crypt::Blowfish; my $cipher = new Crypt::Blowfish $key; my $ciphertext = $cipher->encrypt($plaintext); my $plaintext = $cipher->decrypt($ciphertext); You probably want to use this in conjunction with a block chaining module like Crypt::CBC. =head1 DESCRIPTION Blowfish is capable of strong encryption and can use key sizes up to 56 bytes (a 448 bit key). You're encouraged to take advantage of the full key size to ensure the strongest encryption possible from this module. Crypt::Blowfish has the following methods: =over 4 blocksize() keysize() encrypt() decrypt() =back =head1 FUNCTIONS =over 4 =item blocksize Returns the size (in bytes) of the block cipher. Crypt::Blowfish doesn't return a key size due to its ability to use variable-length keys. More accurately, it shouldn't, but it does anyway to play nicely with others. =item new my $cipher = new Crypt::Blowfish $key; This creates a new Crypt::Blowfish BlockCipher object, using $key, where $key is a key of C bytes (minimum of eight bytes). =item encrypt my $cipher = new Crypt::Blowfish $key; my $ciphertext = $cipher->encrypt($plaintext); This function encrypts $plaintext and returns the $ciphertext where $plaintext and $ciphertext must be of C bytes. (hint: Blowfish is an 8 byte block cipher) =item decrypt my $cipher = new Crypt::Blowfish $key; my $plaintext = $cipher->decrypt($ciphertext); This function decrypts $ciphertext and returns the $plaintext where $plaintext and $ciphertext must be of C bytes. (hint: see previous hint) =back =head1 EXAMPLE my $key = pack("H16", "0123456789ABCDEF"); # min. 8 bytes my $cipher = new Crypt::Blowfish $key; my $ciphertext = $cipher->encrypt("plaintex"); # SEE NOTES print unpack("H16", $ciphertext), "\n"; =head1 PLATFORMS Please see the README document for platforms and performance tests. =head1 NOTES The module is capable of being used with Crypt::CBC. You're encouraged to read the perldoc for Crypt::CBC if you intend to use this module for Cipher Block Chaining modes. In fact, if you have any intentions of encrypting more than eight bytes of data with this, or any other block cipher, you're going to need B type of block chaining help. Crypt::CBC tends to be very good at this. If you're not going to encrypt more than eight bytes, your data B be B eight bytes long. If need be, do your own padding. "\0" as a null byte is perfectly valid to use for this. =head1 SEE ALSO Crypt::CBC, Crypt::DES, Crypt::IDEA Bruce Schneier, I, 1995, Second Edition, published by John Wiley & Sons, Inc. =head1 COPYRIGHT The implementation of the Blowfish algorithm was developed by, and is copyright of, A.M. Kuchling. Other parts of the perl extension and module are copyright of Systemics Ltd ( http://www.systemics.com/ ). Code revisions, updates, and standalone release are copyright 1999-2010 W3Works, LLC. =head1 AUTHOR Original algorithm, Bruce Shneier. Original implementation, A.M. Kuchling. Original Perl implementation, Systemics Ltd. Current maintenance by W3Works, LLC. Current revision and maintainer: Dave Paris