• There's far too much cut-n-paste-n-slightly-modified code in this program. Any time the same sequence of three or four lines of code appears amidst some other code that varies only slightly, it should be a big warning sign. For example, suppose you wanted to change "Processing..." to "Working...". You'd have to edit that in half a dozen places. Factor it out!
• Your chain of "if"-tests should be replaced by a simple hash pointing at the right subroutine to call. That strategy would probably help in the rest as well.

-- Randal L. Schwartz, Perl hacker
Be sure to read my standard disclaimer if this is a reply.

#--------------------------------------------------------------------#
# CryptoPad
#       Date Written:   07-Nov-2001 09:29:47 AM
#       Last Modified:  30-Sep-2003 08:01:44 PM
#       Author:    Kurt Kincaid (sifukurt@yahoo.com)
#       Copyright(c) 2003, Kurt Kincaid
#           All Rights Reserved
#
# NOTICE: This package is free software and may be modified and/or
#         redistributed under the same terms as Perl itself.
#--------------------------------------------------------------------#

use Tk;
use Tk::Dialog;
use Tk::DialogBox;
use Tk::Text;
use Tk::FileSelect;
use Tk::FileDialog;
use Tk::Menu;
use Tk::Menubutton;
use Tk::widgets qw(Menu);
use Tk::Checkbutton;
use Tk::BrowseEntry;
use File::Butler;
use File::Glob;
use Crypt::RC4;
use Crypt::GOST_PP;
use Crypt::TripleDES;
use Crypt::CBC;
use Crypt::Rijndael;
use Crypt::RIPEMD160;
use Crypt::PPDES;
use Crypt::RC5;
use Crypt::CBC;
use Crypt::CAST5;
use Crypt::RC6;
use Crypt::Khazad;
use Crypt::Anubis;
use Crypt::Blowfish;
use Crypt::Twofish2;
use Crypt::Noekeon;
use Crypt::Misty1;
use Crypt::Rainbow;
use Crypt::Serpent;
use Crypt::Skipjack;
use URI::Escape;
use MIME::Base64;
use Digest::MD2;
use Digest::MD4;
use Digest::MD5;
use Digest::SHA1;
use Digest::Haval256;
use Acme::Playwright;
use constant;
use strict;
use vars qw/ $temp_var $cipher $info $t $title $enc_type $mw $passphra
+se
  $ref $algorithm $f $fileName $ea $help $saveas $des $aes $hex
  $hex2 $hex3 $hex4 $hex5 $hex6 $tripledes_header $tripledes_footer
  $rc4_header $rc4_footer $rc5_header $rc5_footer $cast5_header
  $cast5_footer $gost_header $gost_footer $m $fname $mod_date $FSref
  $ripemd $aes_header $aes_footer $VERSION $mm $tt $md2 $md4 $md5
  $helptext $help_label $error @lines $sha $play_header $play_footer
  $anubis_header $anubis_footer %enc %dec $blowfish_header $blowfish_f
+ooter
  $khazad_header $khazad_footer $noekeon_header $noekeon_footer $misty
+1_header
  $misty1_footer $rainbow_header $rainbow_footer $rc6_header $rc6_foot
+er
  $serpent_header $serpent_footer $skipjack_header $skipjack_footer
  $twofish_header $twofish_footer $haval $proc /;

$VERSION          = "3.10.01";
$mod_date         = "30-Sep-2003 08:01:44 PM";
$title            = "Cryptopad v" . $VERSION;
$rc4_header       = "----- CryptoPad RC4 Encrypted Message: Begin ----
+-\n";
$rc4_footer       = "\n----- CryptoPad RC4 Encrypted Message: End ----
+-";
$tripledes_header = "----- CryptoPad TripleDES Encrypted Message: Begi
+n -----\n";
$tripledes_footer = "\n----- CryptoPad TripleDES Encrypted Message: En
+d -----";
$aes_header       = "----- CryptoPad AES (Rijndael) Encrypted Message:
+ Begin -----\n";
$aes_footer       = "\n----- CryptoPad AES (Rijndael) Encrypted Messag
+e: End -----";
$gost_header      = "----- CryptoPad GOST Encrypted Message: Begin ---
+--\n";
$gost_footer      = "\n----- CryptoPad GOST Encrypted Message: End ---
+--";
$rc5_header       = "----- CryptoPad RC5 Encrypted Message: Begin ----
+-\n";
$rc5_footer       = "\n----- CryptoPad RC5 Encrypted Message: End ----
+-";
$cast5_header     = "----- CryptoPad CAST5 Encrypted Message: Begin --
+---\n";
$cast5_footer     = "\n----- CryptoPad CAST5 Encrypted Message: End --
+---";
$play_header      = "----- CryptoPad Acme::Playwright Encrypted Messag
+e: Begin -----\n";
$play_footer      = "\n----- CryptoPad Acme::Playwright Encrypted Mess
+age: End -----";
$anubis_header    = "----- CryptoPad Anubis Encrypted Message: Begin -
+----\n";
$anubis_footer    = "\n----- CrtypoPad Anubis Encrypted Message: End -
+----";
$blowfish_header  = "----- CryptoPad Blowfish Encrypted Message: Begin
+ -----\n";
$blowfish_footer  = "\n----- CrtypoPad Blowfish Encrypted Message: End
+ -----";
$khazad_header    = "----- CryptoPad Khazad Encrypted Message: Begin -
+----\n";
$khazad_footer    = "\n----- CrtypoPad Khazad Encrypted Message: End -
+----";
$noekeon_header   = "----- CryptoPad Noekeon Encrypted Message: Begin 
+-----\n";
$noekeon_footer   = "\n----- CrtypoPad Noekeon Encrypted Message: End 
+-----";
$misty1_header    = "----- CryptoPad Misty1 Encrypted Message: Begin -
+----\n";
$misty1_footer    = "\n----- CrtypoPad Misty1 Encrypted Message: End -
+----";
$rainbow_header   = "----- CryptoPad Rainbow Encrypted Message: Begin 
+-----\n";
$rainbow_footer   = "\n----- CrtypoPad Rainbow Encrypted Message: End 
+-----";
$rc6_header       = "----- CryptoPad RC6 Encrypted Message: Begin ----
+-\n";
$rc6_footer       = "\n----- CrtypoPad RC6 Encrypted Message: End ----
+-";
$serpent_header   = "----- CryptoPad Serpent Encrypted Message: Begin 
+-----\n";
$serpent_footer   = "\n----- CrtypoPad Serpent Encrypted Message: End 
+-----";
$skipjack_header  = "----- CryptoPad Skipjack Encrypted Message: Begin
+ -----\n";
$skipjack_footer  = "\n----- CrtypoPad Skipjack Encrypted Message: End
+ -----";
$twofish_header   = "----- CryptoPad Twofish Encrypted Message: Begin 
+-----\n";
$twofish_footer   = "\n----- CrtypoPad Twofish Encrypted Message: End 
+-----";
$proc             = "Processing....";
%enc = (
    'aes'        => \&aes_encrypt,
    'tripledes'  => \&tripledes_encrypt,
    'gost'       => \&gost_encrypt,
    'rc4'        => \&rc4_encrypt,
    'rc5'        => \&rc5_encrypt,
    'rc6'        => \&rc6_encrypt,
    'cast5'      => \&cast5_encrypt,
    'playwright' => \&playwright_encrypt,
    'anubis'     => \&anubis_encrypt,
    'blowfish'   => \&blowfish_encrypt,
    'khazad'     => \&khazad_encrypt,
    'misty1'     => \&misty1_encrypt,
    'noekeon'    => \&noekeon_encrypt,
    'serpent'    => \&serpent_encrypt,
    'skipjack'   => \&skipjack_encrypt,
    'twofish'    => \&twofish_encrypt,
    'rainbow'    => \&rainbow_encrypt
);

%dec = (
    'aes'        => \&aes_decrypt,
    'tripledes'  => \&tripledes_decrypt,
    'gost'       => \&gost_decrypt,
    'rc4'        => \&rc4_decrypt,
    'rc5'        => \&rc5_decrypt,
    'rc6'        => \&rc6_decrypt,
    'cast5'      => \&cast5_decrypt,
    'playwright' => \&playwright_decrypt,
    'anubis'     => \&anubis_decrypt,
    'blowfish'   => \&blowfish_decrypt,
    'khazad'     => \&khazad_decrypt,
    'misty1'     => \&misty1_decrypt,
    'noekeon'    => \&noekeon_decrypt,
    'serpent'    => \&serpent_decrypt,
    'skipjack'   => \&skipjack_decrypt,
    'twofish'    => \&twofish_decrypt,
    'rainbow'    => \&rainbow_decrypt
);

$mw = MainWindow->new;
$mw->title( $title );

$m = $mw->Frame( -relief => 'groove', -bd => 2 )->pack( -side => 'top'
+, -anchor => 'n', -fill => 'x' );

$m->Menubutton(
    -text      => "File",
    -tearoff   => 0,
    -menuitems => [
        [
            "command" => "New",
            -command  => \&clear
        ],
        [
            "command" => "Open",
            -command  => \&OpenDocument
        ],
        [
            "command" => "Save",
            -command  => \&SaveDocument
        ],
        [
            "command" => "Save As",
            -command  => \&SaveAs
        ],
        [
            "command" => "Exit",
            -command => sub { exit }
        ]
    ]
)->pack( -side => 'left' );

$ea = "ENCRYPTION ALGORITHM:";
$m->Menubutton(
    -text      => "Algorithm",
    -tearoff   => 0,
    -menuitems => [
        [
            "command" => "AES",
            -command => sub { $algorithm = "$ea AES"; $enc_type = "aes
+"; }
        ],
        [
            "command" => "Anubis",
            -command => sub { $algorithm = "$ea Anubis"; $enc_type = "
+anubis"; }
        ],
        [
            "command" => "Blowfish",
            -command => sub { $algorithm = "$ea Blowfish"; $enc_type =
+ "blowfish"; }
        ],
        [
            "command" => "CAST5",
            -command => sub { $algorithm = "$ea CAST5"; $enc_type = "c
+ast5"; }
        ],
        [
            "command" => "GOST",
            -command => sub { $algorithm = "$ea GOST"; $enc_type = "go
+st"; }
        ],
        [
            "command" => "Khazad",
            -command => sub { $algorithm = "$ea Khazad"; $enc_type = "
+khazad"; }
        ],
        [
            "command" => "Misty1",
            -command => sub { $algorithm = "$ea Misty1"; $enc_type = "
+misty1"; }
        ],
        [
            "command" => "Noekeon",
            -command => sub { $algorithm = "$ea Noekeon"; $enc_type = 
+"noekeon"; }
        ],
        [
            "command" => "Rainbow",
            -command => sub { $algorithm = "$ea Rainbow"; $enc_type = 
+"rainbow"; }
        ],
        [
            "command" => "RC4",
            -command => sub { $algorithm = "$ea RC4"; $enc_type = "rc4
+"; }
        ],
        [
            "command" => "RC5",
            -command => sub { $algorithm = "$ea RC5"; $enc_type = "rc5
+"; }
        ],
        [
            "command" => "RC6",
            -command => sub { $algorithm = "$ea RC6"; $enc_type = "rc6
+"; }
        ],
        [
            "command" => "Serpent",
            -command => sub { $algorithm = "$ea Serpent"; $enc_type = 
+"serpent"; }
        ],
        [
            "command" => "Skipjack",
            -command => sub { $algorithm = "$ea Skipjack"; $enc_type =
+ "skipjack"; }
        ],
        [
            "command" => "TripleDES",
            -command => sub { $algorithm = "$ea TripleDES"; $enc_type 
+= "tripledes"; }
        ],
        [
            "command" => "Twofish",
            -command => sub { $algorithm = "$ea Twofish"; $enc_type = 
+"twofish"; }
        ],
        [
            "command" => "Acme::Playwright",
            -command => sub {
                $algorithm = "$ea Acme::Playwright";
                $enc_type  = "playwright";
              }
        ]
    ]
)->pack( -side => 'left' );

$m->Menubutton(
    -text      => "Help",
    -tearoff   => 0,
    -menuitems => [
        [
            "command" => "Help...",
            -command  => \&help
        ],
        [
            "command" => "About...",
            -command  => \&about
        ]
    ]
)->pack( -side => 'left' );

my $font   = $mw->Frame( -bd => 2 )->pack( -side => 'top', -anchor => 
+'n', -fill => 'x' );
my $family = 'Courier';
my $be     = $font->BrowseEntry( -label => 'Font: ', -variable=> \$fam
+ily,
                             -browsecmd => \&apply_font)->pack( -fill 
+=> 'x', -side => 'left', -anchor => 'n' );
$be->insert( 'end', sort $mw->fontFamilies );

my $size = 10;
my $bentry = $font->BrowseEntry(-label => 'Size: ', -variable => \$siz
+e,
                             -browsecmd => \&apply_font)->pack(-side =
+> 'left');
$bentry->insert( 'end', (3..32));

my $weight = 'normal';
$font->Checkbutton( -onvalue => 'bold', -offvalue=> 'normal',
                -text => 'Bold', -variable => \$weight,
                -command => \&apply_font)->pack(-side => 'left' );

my $slant = 'roman';
$font->Checkbutton(-onvalue => 'italic', -offvalue => 'roman',
                -text => 'Italic', -variable => \$slant,
                -command => \&apply_font)->pack( -side => 'left' );

my $underline = 0;
$font->Checkbutton(-text => 'Underline', -variable => \$underline,
                -command => \&apply_font)->pack(-side => 'left' );

my $overstrike = 0;
$font->Checkbutton(-text => 'Overstrike', -variable => \$overstrike,
                -command => \&apply_font)->pack(-side => 'left' );

$f = $mw->Frame->pack( -side => 'top', -fill => 'x' );

$f->Label( -text => "Passphrase:" )->pack( -side => 'left', -anchor =>
+ 'w' );
$f->Entry( -show => '*', -textvariable => \$passphrase )->pack(
    -side   => 'left',
    -anchor => 'w',
    -fill   => 'x',
    -expand => 1
);

$f->Button( -text => "Message Digest", -command => \&Digest )->pack( -
+side => 'right' );
$f->Button( -text => "Decrypt", -command => \&decrypt )->pack( -side =
+> 'right', -anchor => 'e' );
$f->Button( -text => "Encrypt", -command => \&encrypt )->pack( -side =
+> 'right', -anchor => 'e' );

if ( $algorithm eq "" ) {
    $algorithm = "No Encryption Algorithm Selected";
}

$f->Button( -text => "Clear", -command => \&clear )->pack( -side => 'r
+ight', -anchor => 'e' );

$mw->Label( -textvariable => \$algorithm, -relief => 'ridge' )->pack( 
+-side => 'top', -fill => 'x' );

$mw->Label( -textvariable => \$info, -relief => 'ridge' )->pack( -side
+ => 'bottom', -fill => 'x' );
$t = $mw->Scrolled( "Text", -wrap => 'word', -scrollbars => 'e' )->pac
+k(
    -side   => 'bottom',
    -fill   => 'both',
    -expand => 1
);

$info = $title;

#my $stext = $t->get( "1.0", "end" );
#my $sample = $mw->Entry( -textvariable => \$stext)->pack( -fill => 'x
+');
&apply_font;

MainLoop;

#--------------------------------------------------------------------#
# Encryption Sub-Routines
#--------------------------------------------------------------------#

sub encrypt {
    if ( $enc_type ) {
        $info = $proc;
        $temp_var = $t->get( "1.0", "end" );
        chomp $temp_var;
        &{ $enc{ $enc_type } };
    } else {
        Error( "Error", "No encryption algorithm has been selected. Pl
+ease select an algorithm and try again." );
    }
}

sub decrypt {
    if ( $enc_type ) {
        $info = "Processing....";
        $temp_var = $t->get( "1.0", "end" );
        chomp $temp_var;
        &{ $dec{ $enc_type } };
    } else {
        Error( "Error", "No encryption algorithm has been selected. Pl
+ease select an algorithm and try again." );
    }
}

sub rc4_encrypt {
    if ( Confirm() ) {
        $cipher = RC4( $passphrase, $temp_var );
        $info = "";
        $t->delete( "1.0", "end" );
        $cipher = encode_base64( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $rc4_header . $cipher . $rc4_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub rc4_decrypt {
    if ( Confirm() ) {
        $temp_var =~ s/$rc4_header//;
        $temp_var =~ s/$rc4_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = Prep( $temp_var );
        $cipher = RC4( $passphrase, $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub rc5_encrypt {
    if ( Confirm() ) {
        my $ref = Crypt::RC5->new( $passphrase, 16 );
        $cipher = $ref->encrypt( $temp_var );
        $info   = "";
        $t->delete( "1.0", "end" );
        $cipher = encode_base64( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $rc5_header . $cipher . $rc5_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub rc5_decrypt {
    if ( Confirm() ) {
        $temp_var =~ s/$rc5_header//;
        $temp_var =~ s/$rc5_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = Prep( $temp_var );
        my $ref = Crypt::RC5->new( $passphrase, 16 );
        $cipher = $ref->decrypt( $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub blowfish_encrypt {
    if ( Confirm() ) {
        my $ref = Crypt::CBC->new(
            {
                'key'    => $passphrase,
                'cipher' => "Blowfish"
            }
        );
        $cipher = $ref->encrypt( $temp_var );
        $info   = "";
        $t->delete( "1.0", "end" );
        $cipher = encode_base64( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $blowfish_header . $cipher . $blowfish_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub blowfish_decrypt {
    if ( Confirm() ) {
        $temp_var =~ s/$blowfish_header//;
        $temp_var =~ s/$blowfish_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = Prep( $temp_var );
        my $ref = Crypt::CBC->new(
            {
                'key'    => $passphrase,
                'cipher' => "Blowfish"
            }
        );
        $cipher = $ref->decrypt( $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub twofish_encrypt {
    if ( Confirm() ) {
        my $ref = Crypt::CBC->new(
            {
                'key'    => $passphrase,
                'cipher' => "Twofish2"
            }
        );
        $cipher = $ref->encrypt( $temp_var );
        $info   = "";
        $t->delete( "1.0", "end" );
        $cipher = encode_base64( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $twofish_header . $cipher . $twofish_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub twofish_decrypt {
    if ( Confirm() ) {
        $temp_var =~ s/$twofish_header//;
        $temp_var =~ s/$twofish_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = Prep( $temp_var );
        my $ref = Crypt::CBC->new(
            {
                'key'    => $passphrase,
                'cipher' => "Twofish2"
            }
        );
        $cipher = $ref->decrypt( $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub cast5_encrypt {
    if ( Confirm() ) {
        my $ref = Crypt::CBC->new(
            {
                key    => $passphrase,
                cipher => "CAST5",
            }
        );
        $cipher = $ref->encrypt( $temp_var );
        $info   = "";
        $t->delete( "1.0", "end" );
        $cipher = encode_base64( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $cast5_header . $cipher . $cast5_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub cast5_decrypt {
    if ( Confirm() ) {
        $temp_var =~ s/$cast5_header//;
        $temp_var =~ s/$cast5_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = Prep( $temp_var );
        my $ref = Crypt::CBC->new(
            {
                key    => $passphrase,
                cipher => "CAST5",
            }
        );
        $cipher = $ref->decrypt( $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub rc6_encrypt {
    if ( Confirm() ) {
        my $ref = Crypt::CBC->new(
            {
                key    => $passphrase,
                cipher => "RC6",
            }
        );
        $cipher = $ref->encrypt( $temp_var );
        $info   = "";
        $t->delete( "1.0", "end" );
        $cipher = encode_base64( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $rc6_header . $cipher . $rc6_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub rc6_decrypt {
    if ( Confirm() ) {
        $temp_var =~ s/$rc6_header//;
        $temp_var =~ s/$rc6_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = Prep( $temp_var );
        my $ref = Crypt::CBC->new(
            {
                key    => $passphrase,
                cipher => "RC6",
            }
        );
        $cipher = $ref->decrypt( $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub anubis_encrypt {
    my $IV = pack "H32", 0;
    if ( Confirm() ) {
        my $ref = Crypt::CBC->new(
            {
                'key'            => $passphrase,
                'cipher'         => "Anubis",
                'iv'             => $IV,
                'regenerate_key' => 1,
                'padding'        => 'standard',
                'prepend_iv'     => 0
            }
        );
        $cipher = $ref->encrypt( $temp_var );
        $info   = "";
        $t->delete( "1.0", "end" );
        $cipher = encode_base64( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $anubis_header . $cipher . $anubis_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub anubis_decrypt {
    my $IV = pack "H32", 0;
    if ( Confirm() ) {
        $temp_var =~ s/$anubis_header//;
        $temp_var =~ s/$anubis_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = Prep( $temp_var );
        my $ref = Crypt::CBC->new(
            {
                'key'            => $passphrase,
                'cipher'         => "Anubis",
                'iv'             => $IV,
                'regenerate_key' => 1,
                'padding'        => 'standard',
                'prepend_iv'     => 0
            }
        );
        $cipher = $ref->decrypt( $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub rainbow_encrypt {
    my $IV = pack "H32", 0;
    if ( Confirm() ) {
        my $ref = Crypt::CBC->new(
            {
                'key'            => $passphrase,
                'cipher'         => "Rainbow",
                'iv'             => $IV,
                'regenerate_key' => 1,
                'padding'        => 'standard',
                'prepend_iv'     => 0
            }
        );
        $cipher = $ref->encrypt( $temp_var );
        $info   = "";
        $t->delete( "1.0", "end" );
        $cipher = encode_base64( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $rainbow_header . $cipher . $rainbow_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub rainbow_decrypt {
    my $IV = pack "H32", 0;
    if ( Confirm() ) {
        $temp_var =~ s/$rainbow_header//;
        $temp_var =~ s/$rainbow_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = Prep( $temp_var );
        my $ref = Crypt::CBC->new(
            {
                'key'            => $passphrase,
                'cipher'         => "Rainbow",
                'iv'             => $IV,
                'regenerate_key' => 1,
                'padding'        => 'standard',
                'prepend_iv'     => 0
            }
        );
        $cipher = $ref->decrypt( $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub noekeon_encrypt {
    my $IV = pack "H32", 0;
    if ( Confirm() ) {
        my $ref = Crypt::CBC->new(
            {
                'key'            => $passphrase,
                'cipher'         => "Noekeon",
                'iv'             => $IV,
                'regenerate_key' => 1,
                'padding'        => 'standard',
                'prepend_iv'     => 0
            }
        );
        $cipher = $ref->encrypt( $temp_var );
        $info   = "";
        $t->delete( "1.0", "end" );
        $cipher = encode_base64( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $noekeon_header . $cipher . $noekeon_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub noekeon_decrypt {
    my $IV = pack "H32", 0;
    if ( Confirm() ) {
        $temp_var =~ s/$noekeon_header//;
        $temp_var =~ s/$noekeon_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = Prep( $temp_var );
        my $ref = Crypt::CBC->new(
            {
                'key'            => $passphrase,
                'cipher'         => "Noekeon",
                'iv'             => $IV,
                'regenerate_key' => 1,
                'padding'        => 'standard',
                'prepend_iv'     => 0
            }
        );
        $cipher = $ref->decrypt( $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub skipjack_encrypt {
    my $IV = pack "H16", 0;
    if ( Confirm() ) {
        my $ref = Crypt::CBC->new(
            {
                'key'            => $passphrase,
                'cipher'         => "Skipjack",
                'iv'             => $IV,
                'regenerate_key' => 1,
                'padding'        => 'standard',
                'prepend_iv'     => 0
            }
        );
        $cipher = $ref->encrypt( $temp_var );
        $info   = "";
        $t->delete( "1.0", "end" );
        $cipher = encode_base64( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $skipjack_header . $cipher . $skipjack_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub skipjack_decrypt {
    my $IV = pack "H16", 0;
    if ( Confirm() ) {
        $temp_var =~ s/$skipjack_header//;
        $temp_var =~ s/$skipjack_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = Prep( $temp_var );
        my $ref = Crypt::CBC->new(
            {
                'key'            => $passphrase,
                'cipher'         => "Skipjack",
                'iv'             => $IV,
                'regenerate_key' => 1,
                'padding'        => 'standard',
                'prepend_iv'     => 0
            }
        );
        $cipher = $ref->decrypt( $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub khazad_encrypt {
    my $IV = pack "H16", 0;
    if ( Confirm() ) {
        my $ref = Crypt::CBC->new(
            {
                'key'            => $passphrase,
                'cipher'         => "Khazad",
                'iv'             => $IV,
                'regenerate_key' => 1,
                'padding'        => 'standard',
                'prepend_iv'     => 0
            }
        );
        $cipher = $ref->encrypt( $temp_var );
        $info   = "";
        $t->delete( "1.0", "end" );
        $cipher = encode_base64( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $khazad_header . $cipher . $khazad_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub khazad_decrypt {
    my $IV = pack "H16", 0;
    if ( Confirm() ) {
        $temp_var =~ s/$khazad_header//;
        $temp_var =~ s/$khazad_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = Prep( $temp_var );
        my $ref = Crypt::CBC->new(
            {
                'key'            => $passphrase,
                'cipher'         => "Khazad",
                'iv'             => $IV,
                'regenerate_key' => 1,
                'padding'        => 'standard',
                'prepend_iv'     => 0
            }
        );
        $cipher = $ref->decrypt( $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub serpent_encrypt {
    my $IV = pack "H16", 0;
    if ( Confirm() ) {
        my $ref = Crypt::CBC->new(
            {
                'key'            => $passphrase,
                'cipher'         => "Serpent",
                'iv'             => $IV,
                'regenerate_key' => 1,
                'padding'        => 'standard',
                'prepend_iv'     => 0
            }
        );
        $cipher = $ref->encrypt( $temp_var );
        $info   = "";
        $t->delete( "1.0", "end" );
        $cipher = encode_base64( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $serpent_header . $cipher . $serpent_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub serpent_decrypt {
    my $IV = pack "H16", 0;
    if ( Confirm() ) {
        $temp_var =~ s/$serpent_header//;
        $temp_var =~ s/$serpent_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = Prep( $temp_var );
        my $ref = Crypt::CBC->new(
            {
                'key'            => $passphrase,
                'cipher'         => "Serpent",
                'iv'             => $IV,
                'regenerate_key' => 1,
                'padding'        => 'standard',
                'prepend_iv'     => 0
            }
        );
        $cipher = $ref->decrypt( $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub misty1_encrypt {
    my $IV = pack "H16", 0;
    if ( Confirm() ) {
        my $ref = Crypt::CBC->new(
            {
                'key'            => $passphrase,
                'cipher'         => "Misty1",
                'iv'             => $IV,
                'regenerate_key' => 1,
                'padding'        => 'standard',
                'prepend_iv'     => 0
            }
        );
        $cipher = $ref->encrypt( $temp_var );
        $info   = "";
        $t->delete( "1.0", "end" );
        $cipher = encode_base64( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $misty1_header . $cipher . $misty1_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub misty1_decrypt {
    my $IV = pack "H16", 0;
    if ( Confirm() ) {
        $temp_var =~ s/$misty1_header//;
        $temp_var =~ s/$misty1_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = Prep( $temp_var );
        my $ref = Crypt::CBC->new(
            {
                'key'            => $passphrase,
                'cipher'         => "Misty1",
                'iv'             => $IV,
                'regenerate_key' => 1,
                'padding'        => 'standard',
                'prepend_iv'     => 0
            }
        );
        $cipher = $ref->decrypt( $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub tripledes_encrypt {
    if ( Confirm() ) {
        my $des = new Crypt::TripleDES;
        $cipher = $des->encrypt3( $temp_var, $passphrase );
        $info = "";
        $t->delete( "1.0", "end" );
        $cipher = encode_base64( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $tripledes_header . $cipher . $tripledes_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub tripledes_decrypt {
    if ( Confirm() ) {
        my $des = new Crypt::TripleDES;
        $temp_var =~ s/$tripledes_header//;
        $temp_var =~ s/$tripledes_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = Prep( $temp_var );
        $cipher = $des->decrypt3( $temp_var, $passphrase );
        $cipher =~ s/\s*$//;
        chomp $cipher;
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub aes_encrypt {
    if ( Confirm() ) {
        $aes    = new Crypt::CBC( $passphrase, 'Rijndael' );
        $cipher = $aes->encrypt( $temp_var );
        $info   = "";
        $t->delete( "1.0", "end" );
        $cipher = encode_base64( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $aes_header . $cipher . $aes_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub aes_decrypt {
    if ( Confirm() ) {
        @lines = split ( /\n/, $temp_var );
        shift @lines;
        pop @lines;
        $temp_var = join ( "", @lines );
        $temp_var = Prep( $temp_var );
        $aes      = new Crypt::CBC( $passphrase, 'Rijndael' );
        $cipher   = $aes->decrypt( $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub gost_encrypt {
    if ( Confirm() ) {
        my $ref = Crypt::GOST_PP->new( $passphrase );
        $cipher = $ref->encrypt( $temp_var );
        $info   = "";
        $t->delete( "1.0", "end" );
        $cipher = encode_base64( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $gost_header . $cipher . $gost_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub gost_decrypt {
    if ( Confirm() ) {
        my $ref = Crypt::GOST_PP->new( $passphrase );
        $temp_var =~ s/$gost_header//;
        $temp_var =~ s/$gost_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = Prep( $temp_var );
        $cipher   = $ref->decrypt( $temp_var );
        $cipher =~ s/\s*$//;
        chomp $cipher;
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub playwright_encrypt {
    if ( Confirm() ) {
        $cipher = Acme::Playwright::Make( $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $cipher = $play_header . $cipher . $play_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub playwright_decrypt {
    if ( Confirm() ) {
        $temp_var =~ s/$play_header//;
        $temp_var =~ s/$play_footer//;
        $cipher = Acme::Playwright::UnMake( $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

#--------------------------------------------------------------------#
# End Encryption Sub-Routines
#--------------------------------------------------------------------#

sub clear {
    $t->delete( "1.0", "end" );
    $passphrase = "";
    $info       = $title;
    $algorithm  = "No Encryption Algorithm Selected";
    $enc_type   = "";
}

sub about {
    $mw->Dialog(
        -title => "About...",
        -text  => <<"END", -popover => $mw, -font => 'ansi' )->Show;
$title

Last Modified: $mod_date

Copyright 2003 Kurt Kincaid. All rights reserved.

Cryptopad is free software; you can redistribute it and/or modify it u
+nder the same terms as Perl itself.
END
}

sub Digest {
    $info     = "Generating Message Digest....";
    $hex      = Digest::MD5->new();
    $temp_var = $t->get( "1.0", "end" );
    chomp $temp_var;
    if ( $temp_var eq "" ) {
        $info = $title;
        return;
    }
    $hex->add( $temp_var );
    $md5  = $hex->hexdigest();
    $hex2 = Digest::SHA1->new();
    $hex2->add( $temp_var );
    $sha  = $hex2->hexdigest();
    $hex3 = Digest::MD4->new();
    $hex3->add( $temp_var );
    $md4  = $hex3->hexdigest();
    $hex4 = Digest::MD2->new();
    $hex4->add( $temp_var );
    $md2  = $hex4->hexdigest();
    $hex5 = Crypt::RIPEMD160->new();
    $hex5->reset();
    $hex5->add( $temp_var );
    $ripemd = $hex5->hexdigest();
    $hex6   = Digest::Haval256->new();
    $hex6->reset();
    $hex6->add( $temp_var );
    $haval = $hex6->hexdigest();
    $mw->Dialog(
        -title => "Message Digest",
        -text  => <<"END", -popover => $mw, -font => 'ansi' )->Show;
[ SHA ]
$sha

[ MD5 ]
$md5

[ MD4 ]
$md4

[ MD2 ]
$md2

[ RIPEMD-160 ]
$ripemd

[ Haval256 ]
$haval
    
END
    $info = $title;
}

sub OpenDocument {
    $FSref    = $mw->FileSelect();
    $fileName = $FSref->Show();
    $temp_var = Butler( $fileName, "read" );
    if ( !-e $fileName ) {
        $info = "Cannot open $fileName: $!";
        return;
    }
    $t->delete( "1.0", "end" );
    $t->insert( "end", $temp_var );
}

sub SaveDocument {
    if ( $fileName eq "" ) {
        $saveas = $mw->FileDialog( -Title => 'Save As', -Create => 1 )
+;
        $saveas->Label( -text => "File Name: ", -relief => 'groove' );
        $saveas->Entry( -width => 20, -textvariable => \$fileName );
        $fname = $saveas->Show();
    }
    $saveas->destroy();
    $temp_var = $t->get( "1.0", "end" );
    Butler( $fname, "write", \$temp_var );
    $info = "$fname saved";
}

sub SaveAs {
    undef $fileName;
    SaveDocument();
}

sub help {
    $helptext = "
$title
    
Last Modified: $mod_date

The encryption is accomplished with your choice of numerous encryption
+ algorithms. It should be noted that to avoid complications with disp
+laying meta-characters, the encrypted output is escaped via MIME::Bas
+e64. Starting with v2.02, Acme::Playwright is included as one of the 
+encryption algorithms. Please be advised that this is not, nor should
+ it be considered to be strong encryption. Rather, it is simple text 
+obfuscation in the form of a play. 

CryptoPad supports multiple rounds of encryption. For example, it is p
+ossible to encrypt your data with TripleDES, then with AES, then with
+ RC4. Decryption would then be possible in the reverse order. The nam
+e of the encryption algorithm is shown to facilitate this. It is impo
+rtant to note that knowing which encryption algorithm was used in no 
+way diminishes the security of the encryption.

The Message Digests are generated with SHA1, MD5, MD4, and MD2 Message
+ Digest algorithms by RSA Security Inc., RIPEMD-160 by Hans Dobbertin
+, Antoon Bosselaers, and Haval256 by Bart Preneel, of Katholieke Univ
+ersiteit Leuven, and Yuliang Zheng, Josef Pieprzyk, and Jennifer Sebe
+rry..
";

    $help_label = "$title Help";
    $help       = MainWindow->new();
    $help->title( "Help" );
    $mm = $help->Frame->pack( -side => 'top', -fill => 'x' );
    $mm->Button(
        -text    => "Close Window",
        -command => sub { $help->destroy() }
    )->pack( -side => 'right' );
    $help->Label( -textvariable => \$help_label, -relief => 'ridge' )-
+>pack( -side => 'bottom', -fill => 'x' );
    $tt = $help->Scrolled(
        "Text",
        -width      => 120,
        -wrap       => 'word',
        -background => '#ffff88',
        -font       => 'ansi',
        -scrollbars => 'e'
    )->pack( -side => 'bottom', -fill => 'both', -expand => 1 );
    $tt->insert( "end", $helptext );
}

sub Confirm {
    if ( $enc_type eq "playwright" ) {
        return 1;
    }
    if ( $temp_var eq "" ) {
        return 0;
    }
    if ( length( $passphrase ) < 5 ) {
        Error( "Passphrase Error", "The passphrase must be at least 5 
+characters" );
        return 0;
    }
    return 1;
}

sub Error {
    my $error;
    my ( $et, $em ) = @_;
    $error = $mw->Dialog(
        -bitmap => 'error',
        -title  => $et,
        -text   => <<"END", -popover => $mw, -font => 'ansi' )->Show;
$em
END
    $info = $title;
}

sub Prep {
    my $var = shift;
    if ( $var =~ /\%/ ) {
        $var = uri_unescape( $var );
    } else {
        $var = decode_base64( $var );
    }
    return $var;
}

sub apply_font {
    $t->configure( -font =>
                       [ -family => $family,
                         -size => $size,
                         -weight => $weight,
                         -slant => $slant,
                         -underline => $underline,
                         -overstrike => $overstrike]);
}
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