module Encryptor

def self.crypt(cipher_method, *args) #:nodoc:

:nodoc: 
def self.crypt(cipher_method, *args) #:nodoc:
  options = default_options.merge(:value => args.first).merge(args.last.is_a?(Hash) ? args.last : {})
  cipher = OpenSSL::Cipher::Cipher.new(options[:algorithm])
  cipher.send(cipher_method)
  if options[:iv]
    cipher.key = options[:key]
    cipher.iv = options[:iv]
  else
    cipher.pkcs5_keyivgen(options[:key])
  end
  result = cipher.update(options[:value])
  result << cipher.final
end

def self.decrypt(*args)

decrypted_value = Encryptor.decrypt('some encrypted string', :key => 'some secret key')
# or
decrypted_value = Encryptor.decrypt(:value => 'some encrypted string', :key => 'some secret key')

Example

Optionally accepts :iv and :algorithm options

Decrypts a :value with a specified :key 
def self.decrypt(*args)
  crypt :decrypt, *args
end

def self.default_options

Run 'openssl list-cipher-commands' in your terminal to view a list all cipher algorithms that are supported on your platform

Defaults to { :algorithm => 'aes-256-cbc' }

The default options to use when calling the encrypt and decrypt methods 
def self.default_options
  @default_options ||= { :algorithm => 'aes-256-cbc' }
end

def self.encrypt(*args)

encrypted_value = Encryptor.encrypt('some string to encrypt', :key => 'some secret key')
# or
encrypted_value = Encryptor.encrypt(:value => 'some string to encrypt', :key => 'some secret key')

Example

Optionally accepts :iv and :algorithm options

Encrypts a :value with a specified :key 
def self.encrypt(*args)
  crypt :encrypt, *args
end