R10499/api.vhd
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api.vhd
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			library ieee;
			use ieee.std_logic_1164.all;

			entity aead is
			generic (key_size : integer;
			nonce_size : integer;
			block_size : integer);

			port (clk : in std_logic;
			reset : in std_logic; -- active low

			key : in std_logic_vector(key_size-1 downto 0);
			nonce : in std_logic_vector(nonce_size-1 downto 0);

			-- A data block is either associated data or plaintext.
			-- last_block indicates whether the current ad or plaintext
			-- block is the last one with last_partial indicating whether
			-- said block is only partially filled.
			data : in std_logic_vector(block_size-1 downto 0);
			last_block : in std_logic;
			last_partial : in std_logic;

			empty_ad : in std_logic; -- Constant, set at the beginning.
			empty_msg : in std_logic; -- Constant, set at the beginning.

			ready_block : out std_logic; -- Expecting new block at next rising edge.
			ready_full : out std_logic; -- AEAD finished.

			-- Indication signals that tell whether current value on either
			-- the ciphertext or tag output pins is valid.
			cipher_ready : out std_logic;
			tag_ready : out std_logic;

			ciphertext : out std_logic_vector(block_size-1 downto 0);
			tag : out std_logic_vector(block_size-1 downto 0));

			end architecture aead;