#!/usr/bin/perl
use warnings;
use strict;
use Crypt::CBC;

my $KEY = 'secret_foo';

encryptFile( $0 );
decryptFile( "$0.enc");

sub encryptFile {
   my $filename = shift;
   $| = 1;
   print "Encrypting $filename...";
   $| = 0;

   my $cipher = Crypt::CBC->new(
      -key        => $KEY,
      -cipher     => 'Blowfish',
      -padding  => 'space',
      -add_header => 1
   );

   $cipher->start( 'encrypting' );
   open( ORGINAL,   "<./$filename" );
   open( ENCRYPTED, ">./$filename.enc" );

   binmode ORGINAL;
   binmode ENCRYPTED;

   while ( sysread( ORGINAL, my $buffer, 1024 ) ) {
      syswrite( ENCRYPTED, $cipher->crypt( $buffer ) );
   }
   #$cipher->finish;  #wrong 
   syswrite( ENCRYPTED, $cipher->finish );

   close ENCRYPTED;
   close ORGINAL;

   print "done.\n";
}

################################################################### 

sub decryptFile {

   my $filename = shift;
   $| = 1;
   print "Decrypting $filename...";
   $| = 0;


   my $cipher = Crypt::CBC->new(
      -key        => $KEY,
      -cipher     => 'Blowfish',
      -padding  => 'space',
      -add_header => 1
   );


   $cipher->start( 'decrypting' );
   open( ENCRYPTED, "<./$filename" );
   open( DECRYPTED, ">./$filename.decrypted" );

   binmode ENCRYPTED;
   binmode DECRYPTED;

   while ( sysread( ENCRYPTED, my $buffer, 1024 ) ) {
      syswrite( DECRYPTED, $cipher->crypt( $buffer ) );
   }
#   $cipher->finish;   #wrong 
    syswrite( DECRYPTED, $cipher->finish );

   close DECRYPTED;
   close ENCRYPTED;

   print "done.\n";
}
[download]