#--------------------------------------------------------------------#
# CryptoPad
#       Date Written:   07-Nov-2001 09:29:47 AM
#       Last Modified:  29-Nov-2002 10:03:08 AM
#       Author:    Kurt Kincaid (sifukurt@yahoo.com)
#       Copyright (c) 2002, 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 File::Butler;
use File::Glob;
use Crypt::RC4;
use Crypt::GOST_PP;
use Crypt::TripleDES;
use Crypt::CBC;
use Crypt::Rijndael_PP ':all';
use Crypt::RIPEMD160;
use Crypt::PPDES;
use Crypt::RC5;
use Crypt::CBC;
use Crypt::CAST5_PP;
use URI::Escape;
use Digest::MD2;
use Digest::MD4;
use Digest::MD5;
use Digest::SHA1;
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 $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 /;

$VERSION          = "2.00";
$mod_date         = "29-Nov-2002 10:03:08 AM";
$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 --
+---";

$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' );

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

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

$ea = "ENCRYPTION ALGORITHM:";
$f->Menubutton(
    -text      => "Choose Algorithm",
    -relief    => 'raised',
    -tearoff   => 0,
    -menuitems => [
        [
            "command" => "AES",
            -command => sub { $algorithm = "$ea AES"; $enc_type = "aes
+"; }
        ],
        [
            "command" => "TripleDES",
            -command => sub { $algorithm = "$ea TripleDES"; $enc_type 
+= "tripledes"; }
        ],
        [
            "command" => "GOST",
            -command => sub { $algorithm = "$ea GOST"; $enc_type = "go
+st"; }
        ],
        [
            "command" => "RC4",
            -command => sub { $algorithm = "$ea RC4"; $enc_type = "rc4
+"; }
        ],
        [
            "command" => "RC5",
            -command => sub { $algorithm = "$ea RC5"; $enc_type = "rc5
+"; }
        ],
        [
            "command" => "CAST5",
            -command => sub { $algorithm = "$ea CAST5"; $enc_type = "c
+ast5"; }
        ]
    ]
)->pack( -side => 'left' );

$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;

MainLoop;

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

sub encrypt {
    if ( $enc_type eq "aes" ) {
        aes_encrypt();
    } elsif ( $enc_type eq "tripledes" ) {
        tripledes_encrypt();
    } elsif ( $enc_type eq "gost" ) {
        gost_encrypt();
    } elsif ( $enc_type eq "rc4" ) {
        rc4_encrypt();
    } elsif ( $enc_type eq "rc5" ) {
        rc5_encrypt();
    } elsif ( $enc_type eq "cast5" ) {
        cast5_encrypt();
    } elsif ( $enc_type eq "" ) {
        Error( "Error", "No encryption algorithm has been selected. Pl
+ease select an algorithm and try again." );
    }
}

sub decrypt {
    if ( $enc_type eq "aes" ) {
        aes_decrypt();
    } elsif ( $enc_type eq "tripledes" ) {
        tripledes_decrypt();
    } elsif ( $enc_type eq "gost" ) {
        gost_decrypt();
    } elsif ( $enc_type eq "rc4" ) {
        rc4_decrypt();
    } elsif ( $enc_type eq "rc5" ) {
        rc5_decrypt();
    } elsif ( $enc_type eq "cast5" ) {
        cast5_decrypt();
    } elsif ( $enc_type eq "" ) {
        Error( "Error", "No encryption algorithm has been selected. Pl
+ease select an algorithm and try again." );
    }
}

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

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

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

sub rc5_decrypt {
    $info = "Processing....";
    $temp_var = $t->get( "1.0", "end" );
    chomp $temp_var;
    if ( Confirm() ) {
        $temp_var =~ s/$rc5_header//;
        $temp_var =~ s/$rc5_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = uri_unescape( $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 cast5_encrypt {
    $info = "Processing....";
    $temp_var = $t->get( "1.0", "end" );
    chomp $temp_var;
    if ( Confirm() ) {
        my $ref = Crypt::CBC->new(
            {
                key    => $passphrase,
                cipher => "CAST5_PP",
            }
        );
        $cipher = $ref->encrypt( $temp_var );
        $info   = "";
        $t->delete( "1.0", "end" );
        $cipher = uri_escape( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $cast5_header . $cipher . $cast5_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

sub cast5_decrypt {
    $info = "Processing....";
    $temp_var = $t->get( "1.0", "end" );
    chomp $temp_var;
    if ( Confirm() ) {
        $temp_var =~ s/$cast5_header//;
        $temp_var =~ s/$cast5_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = uri_unescape( $temp_var );
        my $ref = Crypt::CBC->new(
            {
                key    => $passphrase,
                cipher => "CAST5_PP",
            }
        );
        $cipher = $ref->decrypt( $temp_var );
        chomp $cipher;
        $info = "";
        $t->delete( "1.0", "end" );
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

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

sub tripledes_decrypt {
    $info = "Processing....";
    $temp_var = $t->get( "1.0", "end" );
    chomp $temp_var;
    if ( Confirm() ) {
        my $des = new Crypt::TripleDES;
        $temp_var =~ s/$tripledes_header//;
        $temp_var =~ s/$tripledes_footer//;
        $temp_var =~ s/\n//g;
        $temp_var = uri_unescape( $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 {
    $info = "Processing....";
    $temp_var = $t->get( "1.0", "end" );
    chomp $temp_var;
    if ( Confirm() ) {
        $aes = new Crypt::CBC( $passphrase, 'Rijndael_PP' );
        $cipher = $aes->encrypt( $temp_var );
        $info   = "";
        $t->delete( "1.0", "end" );
        $cipher = uri_escape( $cipher );
        $cipher =~ s/.{80}/$&\n/g;
        chomp $cipher;
        $cipher = $aes_header . $cipher . $aes_footer;
        $t->insert( "end", $cipher );
        $info = $title;
    }
}

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

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

sub gost_decrypt {
    $info = "Processing....";
    $temp_var = $t->get( "1.0", "end" );
    chomp $temp_var;
    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 = uri_unescape( $temp_var );
        $cipher   = $ref->decrypt( $temp_var );
        $cipher =~ s/\s*$//;
        chomp $cipher;
        $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 2002 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();
    $mw->Dialog(
        -title => "Message Digest",
        -text  => <<"END", -popover => $mw, -font => 'ansi' )->Show;
[ SHA ]
$sha

[ MD5 ]
$md5

[ MD4 ]
$md4

[ MD2 ]
$md2

[ RIPEMD-160 ]
$ripemd
    
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       => 'gro
+ove' );
        $saveas->Entry( -width => 20,            -textvariable => \$fi
+leName );
        $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 several encryption 
+algorithms, TripleDES (the previous, interim NIST Data Encryption Sta
+ndard), AES (also known as Advanced Encryption Standard, or Rijndael,
+ after the authors, Vincent Rijmen and Joan Daemen, the current NIST 
+Data Encryption Standard), GOST (a 64-bit block cipher with a 256-bit
+ key, which was the encryption standard in the former Soviet Union) R
+C5, a fast block cipher by RSA Security Inc., RC4, which is a symmetr
+ical stream cipher by RSA Security Inc, and the CAST5 block cipher, a
+lso known as CAST-128. It should be noted that to avoid complications
+ with displaying meta-characters, the encyrpted output is escaped via
+ URI::Escape.

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., and RIPEMD-160 by Hans Dobbe
+rtin, Antoon Bosselaers, and Bart Preneel, of Katholieke Universiteit
+ Leuven. A Message Digest (also known as \"fingerprint\") is a one-wa
+y encrypted hash function based on the content of the document. It is
+ mathematically infeasible to have two documents with the same Messag
+e Digest, and even less likely that the document would say what you w
+ant it to say. As such, a Message Digest can be used to \"sign\" a do
+cument and verify that the contents of the document have not been alt
+ered, either by accident or design.
";

    $help_label = "$title Help";
    $help       = MainWindow->new();
    $help->title( "Help" );
    $mm = $help->Frame->pack( -side => 'top', -fill => 'x' );
    $mm->Button( -text => "Close Window", -command => sub { $help->des
+troy() } )->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 ( $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;
}
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