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----Hash Function---
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LIBRARY IEEE;
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USE IEEE.STD_LOGIC_1164.ALL;
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USE IEEE.STD_LOGIC_ARITH.ALL;
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USE IEEE.STD_LOGIC_UNSIGNED.ALL;
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USE IEEE.NUMERIC_STD.ALL;
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USE IEEE.STD_LOGIC_MISC.ALL;
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----------------
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ENTITY hash IS
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GENERIC(
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KEY_WIDTH : NATURAL := 48;--Hash key width
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ADD_WIDTH : NATURAL := 12; --address width
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HASH_NO : NATURAL := 4 --Hash number
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);
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PORT (
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key : STD_LOGIC_VECTOR(47 DOWNTO 0); --Hash key
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address : OUT STD_LOGIC_VECTOR(ADD_WIDTH-1 DOWNTO 0) --address
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);
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END ENTITY hash;
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---------------------------------
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ARCHITECTURE behavioral OF hash IS
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TYPE matrix_generator_type IS ARRAY (0 TO ADD_WIDTH-1) OF STD_LOGIC_VECTOR(KEY_WIDTH-1 DOWNTO 0);
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TYPE matrix_type IS ARRAY (0 TO 3) OF matrix_generator_type ;
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CONSTANT matrix : matrix_type:=(
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(X"1066cb9fe7bc", X"d56494892645", X"492cf1e56e26", X"fbd5ee7df102",
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X"da6ff1b5421b", X"2186ffc8bdb6", X"9089eb857902", X"4315d53c7df8",
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X"c13cbcb713d7", X"9c1b26e99383", X"1ff39e15912a", X"b4008e58a8c9"), -- H1
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(X"02a6200f47d5", X"812bbc47a2a4", X"1bcc1d1cb32a", X"5158420941ea",
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X"c13cbcb713d7", X"9c1b26e99383", X"1ff39e15912a", X"b4008e58a8c9",
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X"c13cbcb713d7", X"9c1b26e99383", X"1ff39e15912a", X"b4008e58a8c9"), -- H2
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(X"2ce30e05be00", X"e8e3eefc2b70", X"5b3a5cdff1d3", X"087f63fb3838",
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X"f43c6ceb8b24", X"b3e80a27240e", X"88a21edc44d7", X"9a0320707b17",
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X"c13cbcb713d7", X"9c1b26e99383", X"1ff39e15912a", X"b4008e58a8c9"), -- H3
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(X"27d0a50ed2db", X"7f09c83e8ce3", X"73af4e487d3f", X"6f02e7293763",
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X"87ebcfd7adfe", X"ed4fe1631a21", X"88c79139eee0", X"e4dde0201768",
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X"c13cbcb713d7", X"9c1b26e99383", X"1ff39e15912a", X"b4008e58a8c9") -- H4
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);
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SIGNAL matrix_wires : matrix_generator_type;
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BEGIN
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PROCESS(key ,matrix_wires)
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BEGIN
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FOR row IN 0 TO ADD_WIDTH-1 LOOP
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FOR col IN 0 TO KEY_WIDTH-1 LOOP
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matrix_wires(row)(col)<= matrix(HASH_NO-1)(row)(col) AND key(col) ;
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END LOOP;
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address(row) <= XOR_REDUCE(matrix_wires(row)) ;--XOR address(row);
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END LOOP;
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END PROCESS;
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END ARCHITECTURE behavioral;
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