# XOR cipher where the key is repeated to match the length of the message.
class RepeatingKeyXorCipher
	super Cipher

	# Cryptographic key used in encryption and decryption.
	var key = new Bytes.empty

	redef fun encrypt do
		assert key.length > 0
		ciphertext = plaintext.xorcipher(key)
	end

	redef fun decrypt do
		assert key.length > 0
		plaintext = ciphertext.xorcipher(key)
	end
end