Encryption decription

#This module does all the encryption and decryption using OpenSSL ruby class 
module EncryptionEngine


  #encrypt method as the name suggest encrypts 'data' using 'algorithm' with 'key'
  def encrypt( data, key, algorithm)
    #Do not encrypt if data is nil
    if !data.nil? && !data.empty? 
      cipher = OpenSSL::Cipher::Cipher.new algorithm
      cipher.encrypt
      cipher.key = key
      ciphertext = cipher.update data
      encryptext= Base64::encode64(ciphertext << cipher.final)
    end
  end
  
  
  #decrypt method as the name suggest decrypts 'encrypted_data' using 'algorithm' with 'key'
  def decrypt( encrypted_data, key, algorithm)
    #If encrypted_data is nil, don not decrypt and return '0'
    if !encrypted_data.nil?  && !encrypted_data.empty?  
      puts encrypted_data
      cipher = OpenSSL::Cipher::Cipher.new algorithm
      cipher.decrypt
      cipher.key = key
      encrypted_data = Base64::decode64(encrypted_data)
      plaintext = cipher.update encrypted_data
      plaintext = (plaintext << cipher.final)
    end
  end

end