#!/usr/bin/perl

use strict;
use warnings;

use Crypt::Blowfish;

my $key=pack("H16","0123456789ABCDEF");

sub encrypt_8_chars{

  my $plain_text=$_[0];
  my $encrypted_data;
  my $encrypted_text;
  my $cipher = new Crypt::Blowfish $key;
   
  # Enlarge the string to 8 characters by appending with NULL characters 
  while(length($plain_text) < 8){
    $plain_text=sprintf("%s\0",$plain_text);
  }
 
  $encrypted_data=$cipher->encrypt($plain_text); # Take the string and encrypt using blowfish
  $encrypted_text=unpack("H16",$encrypted_data);
  
  return $encrypted_text;
} # encrypt_8_chars


sub decrypt_8_chars{

  my $encrypted_text=$_[0];
  my $encrypted_data;
  my $plain_text;
  my $cipher = new Crypt::Blowfish $key;

  $encrypted_data=pack("H16",$encrypted_text);
  $plain_text=$cipher->decrypt($encrypted_data); # Take the string and decrypt using blowfish

  $plain_text =~ s/\0//g; # Shrink the string by removing appended with NULL characters 
  
  return $plain_text;
} # decrypt_8_chars


sub encrypt_text{

  my $plain_text=$_[0];
  my @plain_chunks;
  my $plain_chunk;
  my $encrypted_text="";
 
  @plain_chunks=($plain_text =~ /.{1,8}/g); # Chop any size of the text into up to 8 charachers and put each chunk into an array
 
  foreach $plain_chunk (@plain_chunks){
    $encrypted_text=sprintf("%s%s",$encrypted_text,encrypt_8_chars($plain_chunk));
  }
  
  return $encrypted_text;
} # encrypt_text


sub decrypt_text{

  my $encrypted_text=$_[0];
  my @encrypted_chunks;
  my $encrypted_chunk; 
  my $plain_text="";
 
  @encrypted_chunks=($encrypted_text =~ /.{1,16}/g); # Chop any size of the text into up to 16 charachers and put each chunk into an array
 
  foreach $encrypted_chunk (@encrypted_chunks){
    $plain_text=sprintf("%s%s",$plain_text,decrypt_8_chars($encrypted_chunk));
  }

  return $plain_text;
} # decrypt_text



my $input;
my $encrypted;
my $decrypted;

printf("Enter the string to encrypt\n");
chomp($input=<STDIN>);

$encrypted=encrypt_text($input);
printf("The encrypted value of %s is %s\n",$input,$encrypted);
  
$decrypted=decrypt_text($encrypted);
printf("The decrypted value of %s is %s\n",$encrypted,$decrypted);