cryptosphere/cryptor

module Cryptor
  class SymmetricEncryption
    # Base class of all Cryptor::SymmetricEncryption ciphers
    class Cipher
      REGISTRY = {}

      attr_reader :algorithm, :key_bytes

      def self.register(algorithm, options = {})
        REGISTRY[algorithm.to_s] ||= new(algorithm, options)
      end

      def self.[](algorithm)
        REGISTRY[algorithm.to_s] || fail(ArgumentError, "no such cipher: #{algorithm}")
      end

      def initialize(algorithm, options = {})
        @algorithm = algorithm
        @key_bytes = options[:key_bytes] || fail(ArgumentError, 'key_bytes not specified')
      end

      def random_key
        SecretKey.random_key(self)
      end

      def encrypt(_key, _plaintext)
        #:nocov:
        fail NotImplementedError, "'encrypt' method has not been implemented"
        #:nocov:
      end

      def decrypt(_key, _ciphertext)
        #:nocov:
        fail NotImplementedError, "'decrypt' method has not been implemented"
        #:nocov:
      end
    end
  end
end