message_encryptor.rb

module Devise
  module Encryptable
    module Encryptors
      class MessageEncryptor < Base
        class << self
          def digest(password, stretches, salt, papper)
            encryptor = ::ActiveSupport::MessageEncryptor.new(papper)
            encryptor.encrypt_and_sign(password)
          end
          alias :encrypt :digest

          def compare(encrypted_password, password, stretches, salt, papper)
            Devise.secure_compare(decrypt(encrypted_password, papper), password)
          end

          def salt(stretches=0)
            SecureRandom.base64(10)
          end

          def decrypt(encrypted_password, papper)
            encryptor = ::ActiveSupport::MessageEncryptor.new(papper)
            encryptor.decrypt_and_verify(encrypted_password)
          end
        end
      end
    end
  end
end