| ////////////////////////////////////////////////////////////////////// |
| //// //// |
| //// Mixcolumns for 8 bit //// |
| //// //// |
| //// This file is part of the SystemC AES //// |
| //// //// |
| //// Description: //// |
| //// Mixcolum for a byte //// |
| //// //// |
| //// Generated automatically using SystemC to Verilog translator //// |
| //// //// |
| //// To Do: //// |
| //// - done //// |
| //// //// |
| //// Author(s): //// |
| //// - Javier Castillo, jcastilo@opencores.org //// |
| //// //// |
| ////////////////////////////////////////////////////////////////////// |
| //// //// |
| //// Copyright (C) 2000 Authors and OPENCORES.ORG //// |
| //// //// |
| //// This source file may be used and distributed without //// |
| //// restriction provided that this copyright statement is not //// |
| //// removed from the file and that any derivative work contains //// |
| //// the original copyright notice and the associated disclaimer. //// |
| //// //// |
| //// This source file is free software; you can redistribute it //// |
| //// and/or modify it under the terms of the GNU Lesser General //// |
| //// Public License as published by the Free Software Foundation; //// |
| //// either version 2.1 of the License, or (at your option) any //// |
| //// later version. //// |
| //// //// |
| //// This source is distributed in the hope that it will be //// |
| //// useful, but WITHOUT ANY WARRANTY; without even the implied //// |
| //// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //// |
| //// PURPOSE. See the GNU Lesser General Public License for more //// |
| //// details. //// |
| //// //// |
| //// You should have received a copy of the GNU Lesser General //// |
| //// Public License along with this source; if not, download it //// |
| //// from http://www.opencores.org/lgpl.shtml //// |
| //// //// |
| ////////////////////////////////////////////////////////////////////// |
| // |
| // CVS Revision History |
| // |
| // $Log: byte_mixcolum.v,v $ |
| // Revision 1.1.1.1 2004/07/05 09:46:23 jcastillo |
| // First import |
| // |
| |
| module byte_mixcolum(a,b,c,d,outx,outy); |
| |
| input [7:0] a,b,c,d; |
| output [7:0] outx, outy; |
| |
| reg [7:0] outx, outy; |
| |
| function [7:0] xtime; |
| input [7:0] in; |
| reg [3:0] xtime_t; |
| |
| begin |
| xtime[7:5] = in[6:4]; |
| xtime_t[3] = in[7]; |
| xtime_t[2] = in[7]; |
| xtime_t[1] = 0; |
| xtime_t[0] = in[7]; |
| xtime[4:1] =xtime_t^in[3:0]; |
| xtime[0] = in[7]; |
| end |
| endfunction |
| |
| reg [7:0] w1,w2,w3,w4,w5,w6,w7,w8,outx_var; |
| always @ (a, b, c, d) |
| begin |
| w1 = a ^b; |
| w2 = a ^c; |
| w3 = c ^d; |
| w4 = xtime(w1); |
| w5 = xtime(w3); |
| w6 = w2 ^w4 ^w5; |
| w7 = xtime(w6); |
| w8 = xtime(w7); |
| |
| outx_var = b^w3^w4; |
| outx=outx_var; |
| outy=w8^outx_var; |
| |
| end |
| |
| endmodule |
