------------------------------------------------------------
-- Copyright: 2011 George Mason University, Virginia USA
--            http://www.iis.ee.ethz.ch/~sha3
------------------------------------------------------------
-- =====================================================================

-- Copyright © 2010-11 by Cryptographic Engineering Research Group (CERG),

-- ECE Department, George Mason University

-- Fairfax, VA, U.S.A.

-- =====================================================================


library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
use work.sha3_pkg.all;
use work.sha2_pkg.all;

entity sha2_cons is 
generic(n :integer:=HASH_SIZE_256/SHA2_WORDS_NUM; a :integer:=LOG_2_64);	
port(
	address			: in std_logic_vector(a-1 downto 0);
  	output			: out std_logic_vector(n-1 downto 0));
end sha2_cons;

architecture sha2_cons of sha2_cons is

	type matrix256 is array (0 to 63) of std_logic_vector(31 downto 0);
	constant my_rom256: matrix256 :=(
	x"428a2f98",  
	x"71374491",
	x"b5c0fbcf", 
	x"e9b5dba5", 
	x"3956c25b", 
	x"59f111f1",
	x"923f82a4",
	x"ab1c5ed5",
	x"d807aa98", 
	x"12835b01", 
	x"243185be", 
	x"550c7dc3", 
	x"72be5d74", 
	x"80deb1fe", 
	x"9bdc06a7", 
	x"c19bf174", 
	x"e49b69c1", 
	x"efbe4786", 
	x"0fc19dc6", 
	x"240ca1cc", 
	x"2de92c6f", 
	x"4a7484aa", 
	x"5cb0a9dc", 
	x"76f988da", 
	x"983e5152", 
	x"a831c66d", 
	x"b00327c8", 
	x"bf597fc7", 
	x"c6e00bf3", 
	x"d5a79147", 
	x"06ca6351", 
	x"14292967", 
	x"27b70a85", 
	x"2e1b2138", 
	x"4d2c6dfc", 
	x"53380d13", 
	x"650a7354", 
	x"766a0abb", 
	x"81c2c92e", 
	x"92722c85", 
	x"a2bfe8a1", 
	x"a81a664b", 
	x"c24b8b70", 
	x"c76c51a3", 
	x"d192e819", 
	x"d6990624", 
	x"f40e3585", 
	x"106aa070", 
	x"19a4c116", 
	x"1e376c08", 
	x"2748774c", 
	x"34b0bcb5", 
	x"391c0cb3", 
	x"4ed8aa4a", 
	x"5b9cca4f", 
	x"682e6ff3", 
	x"748f82ee", 
	x"78a5636f", 
	x"84c87814", 
	x"8cc70208", 
	x"90befffa", 
	x"a4506ceb", 
	x"bef9a3f7", 
	x"c67178f2"		 	
	);				 
	
	
	type matrix512 is array (0 to 127) of std_logic_vector(63 downto 0);
	constant my_rom512: matrix512 :=(
	x"428a2f98d728ae22",
	x"7137449123ef65cd", 
	x"b5c0fbcfec4d3b2f", 
	x"e9b5dba58189dbbc",
	x"3956c25bf348b538",
	x"59f111f1b605d019", 
	x"923f82a4af194f9b", 
	x"ab1c5ed5da6d8118",
	x"d807aa98a3030242", 
	x"12835b0145706fbe", 
	x"243185be4ee4b28c", 
	x"550c7dc3d5ffb4e2",
	x"72be5d74f27b896f", 
	x"80deb1fe3b1696b1", 
	x"9bdc06a725c71235", 
	x"c19bf174cf692694",
	x"e49b69c19ef14ad2", 
	x"efbe4786384f25e3", 
	x"0fc19dc68b8cd5b5", 
	x"240ca1cc77ac9c65",
	x"2de92c6f592b0275", 
	x"4a7484aa6ea6e483", 
	x"5cb0a9dcbd41fbd4", 
	x"76f988da831153b5",
	x"983e5152ee66dfab", 
	x"a831c66d2db43210", 
	x"b00327c898fb213f", 
	x"bf597fc7beef0ee4",
	x"c6e00bf33da88fc2", 
	x"d5a79147930aa725", 
	x"06ca6351e003826f", 
	x"142929670a0e6e70",
	x"27b70a8546d22ffc", 
	x"2e1b21385c26c926", 
	x"4d2c6dfc5ac42aed", 
	x"53380d139d95b3df",
	x"650a73548baf63de", 
	x"766a0abb3c77b2a8", 
	x"81c2c92e47edaee6", 
	x"92722c851482353b",
	x"a2bfe8a14cf10364", 
	x"a81a664bbc423001", 
	x"c24b8b70d0f89791", 
	x"c76c51a30654be30",
	x"d192e819d6ef5218", 
	x"d69906245565a910", 
	x"f40e35855771202a", 
	x"106aa07032bbd1b8",
	x"19a4c116b8d2d0c8", 
	x"1e376c085141ab53", 
	x"2748774cdf8eeb99", 
	x"34b0bcb5e19b48a8",
	x"391c0cb3c5c95a63", 
	x"4ed8aa4ae3418acb", 
	x"5b9cca4f7763e373", 
	x"682e6ff3d6b2b8a3",
	x"748f82ee5defb2fc", 
	x"78a5636f43172f60", 
	x"84c87814a1f0ab72", 
	x"8cc702081a6439ec",
	x"90befffa23631e28", 
	x"a4506cebde82bde9",
	x"bef9a3f7b2c67915", 
	x"c67178f2e372532b",
	x"ca273eceea26619c", 
	x"d186b8c721c0c207", 
	x"eada7dd6cde0eb1e", 
	x"f57d4f7fee6ed178",
	x"06f067aa72176fba", 
	x"0a637dc5a2c898a6",
	x"113f9804bef90dae", 
	x"1b710b35131c471b",
	x"28db77f523047d84", 
	x"32caab7b40c72493", 
	x"3c9ebe0a15c9bebc", 
	x"431d67c49c100d4c",
	x"4cc5d4becb3e42b6", 
	x"597f299cfc657e2a", 
	x"5fcb6fab3ad6faec", 
	x"6c44198c4a475817",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000",
	x"0000000000000000");

begin	   
	
	h256: if n = 32 generate
		output <= my_rom256(conv_integer(unsigned(address)));
	end generate;
	h512: if n = 64 generate								 
		output <= my_rom512(conv_integer(unsigned(address)));
	end generate;
		
	
end sha2_cons;