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[/] [systemcaes/] [trunk/] [rtl/] [systemc/] [aes128lowarea/] [mixcolum.cpp] - Rev 28
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////////////////////////////////////////////////////////////////////// //// //// //// AES mixcolum module implementation //// //// //// //// This file is part of the SystemC AES //// //// //// //// Description: //// //// Mixcolum stage implementation for AES algorithm //// //// //// //// 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: not supported by cvs2svn $ // Revision 1.2 2004/08/30 14:44:44 jcastillo // Code Formater used to give better appearance to SystemC code // // Revision 1.1.1.1 2004/07/05 09:46:22 jcastillo // First import // #include "mixcolum.h" void mixcolum::mux() { outmux.write(decrypt_i.read() ? outy.read() : outx.read()); } void mixcolum::mixcol() { sc_biguint<128> data_i_var; sc_uint<32> aux; sc_biguint<128> data_reg_var; data_i_var = data_i.read(); data_reg_var = data_reg.read(); next_data_reg.write(data_reg.read()); next_state.write(state.read()); mix_word.write(0); next_ready_o.write(0); next_data_o.write(data_o_reg.read()); switch (state.read()) { case 0: if (start_i.read()) { aux = data_i_var.range(127, 96); mix_word.write(aux); data_reg_var.range(127, 96) = outmux.read(); next_data_reg.write(data_reg_var); next_state.write(1); } break; case 1: aux = data_i_var.range(95, 64); mix_word.write(aux); data_reg_var.range(95, 64) = outmux.read(); next_data_reg.write(data_reg_var); next_state.write(2); break; case 2: aux = data_i_var.range(63, 32); mix_word.write(aux); data_reg_var.range(63, 32) = outmux.read(); next_data_reg.write(data_reg_var); next_state.write(3); break; case 3: aux = data_i_var.range(31, 0); mix_word.write(aux); data_reg_var.range(31, 0) = outmux.read(); next_data_o.write(data_reg_var); next_ready_o.write(1); next_state.write(0); break; default: break; } } void mixcolum::registers() { if (!reset.read()) { data_reg.write(0); state.write(0); ready_o.write(0); data_o_reg.write(0); } else { data_reg.write(next_data_reg.read()); state.write(next_state.read()); ready_o.write(next_ready_o.read()); data_o_reg.write(next_data_o.read()); } } void mixcolum::assign_data_o() { data_o.write(data_o_reg.read()); }