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#!/usr/bin/perl |
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## |
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## Crypt::TripleDES -- Pure Perl Triple DES encryption. |
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## |
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## Copyright (c) 1999, Vipul Ved Prakash. All rights reserved. |
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## This code is free software; you can redistribute it and/or modify |
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## it under the same terms as Perl itself. |
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## |
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## $Id: TripleDES.pm,v 0.24 1999/10/13 23:26:15 root Exp root $ |
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package Crypt::TripleDES; |
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use Crypt::PPDES; |
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use vars qw( $AUTOLOAD $VERSION); |
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( $VERSION ) = '$Revision: 0.24 $' =~ /\s(\d+\.\d+)\s/; |
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sub AUTOLOAD { |
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my ( $self, @args ) = @_; |
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my $key = $AUTOLOAD; $key =~ s/.*://; |
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if ( $key eq "encrypt3" ) { |
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return $self->decrypt3 ( @args, 1 ); |
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} |
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} |
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sub new { return bless {}, shift } |
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sub decrypt3 { |
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my ( $self, $plaintext, $passphrase, $flag ) = @_; |
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my %keyvecs; |
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$passphrase .= ' ' x (16*3); |
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for ( 0..2 ) { |
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my @kvs = Crypt::PPDES::des_set_key( pack( "H*", substr($passphrase, 16*$_, 16 ))); |
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$keyvecs{$_} = \@kvs; |
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} |
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my $size = length ( $plaintext ); |
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my $tail = 8 - ( $size % 8 ); $tail = 0 if $tail > 7; |
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$plaintext .= chr(32) x $tail; |
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$size = length ( $plaintext ); |
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my $cyphertext = ""; |
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for ( 0 .. (($size)/8) -1 ) { |
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my $pt = substr( $plaintext, $_*8, 8 ); |
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$pt = Crypt::PPDES::des_ecb_encrypt( $flag ? $keyvecs{0} : $keyvecs{2}, $flag, $pt ); |
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$pt = Crypt::PPDES::des_ecb_encrypt( $keyvecs{1}, (not $flag), $pt ); |
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$pt = Crypt::PPDES::des_ecb_encrypt( $flag ? $keyvecs{2} : $keyvecs{0}, $flag, $pt ); |
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$cyphertext .= $pt; |
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} |
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return substr ( $cyphertext, 0, $size ); |
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} |
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sub debug { |
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my ( @mess ) = @_; |
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open D, ">>debug"; |
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print D "@mess\n"; |
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close D; |
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} |
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"True Value"; |
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=head1 NAME |
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Crypt::TripleDES - Triple DES encyption. |
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=head1 SYNOPSIS |
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my $des = new Crypt::TripleDES; |
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my $cyphertext = $des->encrypt3 ( $plaintext, $passphrase ); |
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my $plaintext = $des->decrypt3 ( $cyphertext, $passphrase ); |
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=head1 DESCRIPTION |
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This module implements 3DES encryption in ECB mode. The code is based on |
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Eric Young's implementation of DES in pure perl. It's quite slow because of |
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the way Perl handles bit operations and is not recommended for use with |
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large texts. |
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=head1 METHODS |
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=over 4 |
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=item B |
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The constructor. |
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=item B $plaintext, $passphrase |
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Encrypts the plaintext string using the passphrase. Whitespace characters |
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are appended to the string if its length is not a multiple of eight. User |
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applications can correct for this by storing plaintext size with the |
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cyphertext. The passphrase is an ASCII character string of upto 48 |
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characters. |
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=item B $cyphertext, $passphrase |
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Inverse of encrypt3(). |
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=back |
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=head1 AUTHOR |
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Vipul Ved Prakash, mail@vipul.net |
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Eric Young, eay@psych.psy.uq.oz.au |
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108
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Patches: |
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Jonathan Mayer |
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111
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=cut |
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