Encryption using AES-256-CBC with Rails

crypt.rb

module Crypt

  class << self

    ENCRYPTION_KEY = Rails.application.secrets[:encryption_key]
    ALGO = 'aes-256-cbc'.freeze

    def encrypt(value)
      crypt(:encrypt, value)
    end

    def decrypt(value)
      crypt(:decrypt, value)
    end

    def crypt(cipher_method, value)
      cipher = OpenSSL::Cipher.new(ALGO)
      cipher.send(cipher_method)
      cipher.pkcs5_keyivgen(ENCRYPTION_KEY)
      result = cipher.update(value)
      result << cipher.final
    end
    
  end

end