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////////////////////////////////////////////////////////////////////// //// //// //// AES subbytes module implementation //// //// //// //// This file is part of the SystemC AES //// //// //// //// Description: //// //// Subbytes 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 1.3 2005/03/16 18:12:25 jcastillo // // Style modifications // // Revision 1.1 2005/01/26 16:51:06 jcastillo // New examples for 0.2.5 version // // 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 "subbytes.h" void subbytes::sub() { sc_biguint<128> data_i_var, data_reg_128; sc_uint<8> data_array[16], data_reg_var[16]; #define assign_array_to_128() \ { \ data_reg_128.range(127,120)=data_reg_var[0]; \ data_reg_128.range(119,112)=data_reg_var[1]; \ data_reg_128.range(111,104)=data_reg_var[2]; \ data_reg_128.range(103,96)=data_reg_var[3]; \ data_reg_128.range(95,88)=data_reg_var[4]; \ data_reg_128.range(87,80)=data_reg_var[5]; \ data_reg_128.range(79,72)=data_reg_var[6]; \ data_reg_128.range(71,64)=data_reg_var[7]; \ data_reg_128.range(63,56)=data_reg_var[8]; \ data_reg_128.range(55,48)=data_reg_var[9]; \ data_reg_128.range(47,40)=data_reg_var[10]; \ data_reg_128.range(39,32)=data_reg_var[11]; \ data_reg_128.range(31,24)=data_reg_var[12]; \ data_reg_128.range(23,16)=data_reg_var[13]; \ data_reg_128.range(15,8)=data_reg_var[14]; \ data_reg_128.range(7,0)=data_reg_var[15]; \ } #define shift_array_to_128() \ { \ data_reg_128.range(127,120)=data_reg_var[0]; \ data_reg_128.range(119,112)=data_reg_var[5]; \ data_reg_128.range(111,104)=data_reg_var[10]; \ data_reg_128.range(103,96)=data_reg_var[15]; \ data_reg_128.range(95,88)=data_reg_var[4]; \ data_reg_128.range(87,80)=data_reg_var[9]; \ data_reg_128.range(79,72)=data_reg_var[14]; \ data_reg_128.range(71,64)=data_reg_var[3]; \ data_reg_128.range(63,56)=data_reg_var[8]; \ data_reg_128.range(55,48)=data_reg_var[13]; \ data_reg_128.range(47,40)=data_reg_var[2]; \ data_reg_128.range(39,32)=data_reg_var[7]; \ data_reg_128.range(31,24)=data_reg_var[12]; \ data_reg_128.range(23,16)=data_reg_var[1]; \ data_reg_128.range(15,8)=data_reg_var[6]; \ data_reg_128.range(7,0)=data_reg_var[11]; \ } #define invert_shift_array_to_128() \ { \ data_reg_128.range(127,120)=data_reg_var[0]; \ data_reg_128.range(119,112)=data_reg_var[13]; \ data_reg_128.range(111,104)=data_reg_var[10]; \ data_reg_128.range(103,96)=data_reg_var[7]; \ data_reg_128.range(95,88)=data_reg_var[4]; \ data_reg_128.range(87,80)=data_reg_var[1]; \ data_reg_128.range(79,72)=data_reg_var[14]; \ data_reg_128.range(71,64)=data_reg_var[11]; \ data_reg_128.range(63,56)=data_reg_var[8]; \ data_reg_128.range(55,48)=data_reg_var[5]; \ data_reg_128.range(47,40)=data_reg_var[2]; \ data_reg_128.range(39,32)=data_reg_var[15]; \ data_reg_128.range(31,24)=data_reg_var[12]; \ data_reg_128.range(23,16)=data_reg_var[9]; \ data_reg_128.range(15,8)=data_reg_var[6]; \ data_reg_128.range(7,0)=data_reg_var[3]; \ } data_i_var = data_i.read(); data_array[0] = data_i_var.range(127, 120); data_array[1] = data_i_var.range(119, 112); data_array[2] = data_i_var.range(111, 104); data_array[3] = data_i_var.range(103, 96); data_array[4] = data_i_var.range(95, 88); data_array[5] = data_i_var.range(87, 80); data_array[6] = data_i_var.range(79, 72); data_array[7] = data_i_var.range(71, 64); data_array[8] = data_i_var.range(63, 56); data_array[9] = data_i_var.range(55, 48); data_array[10] = data_i_var.range(47, 40); data_array[11] = data_i_var.range(39, 32); data_array[12] = data_i_var.range(31, 24); data_array[13] = data_i_var.range(23, 16); data_array[14] = data_i_var.range(15, 8); data_array[15] = data_i_var.range(7, 0); data_reg_var[0] = data_reg.read().range(127, 120); data_reg_var[1] = data_reg.read().range(119, 112); data_reg_var[2] = data_reg.read().range(111, 104); data_reg_var[3] = data_reg.read().range(103, 96); data_reg_var[4] = data_reg.read().range(95, 88); data_reg_var[5] = data_reg.read().range(87, 80); data_reg_var[6] = data_reg.read().range(79, 72); data_reg_var[7] = data_reg.read().range(71, 64); data_reg_var[8] = data_reg.read().range(63, 56); data_reg_var[9] = data_reg.read().range(55, 48); data_reg_var[10] = data_reg.read().range(47, 40); data_reg_var[11] = data_reg.read().range(39, 32); data_reg_var[12] = data_reg.read().range(31, 24); data_reg_var[13] = data_reg.read().range(23, 16); data_reg_var[14] = data_reg.read().range(15, 8); data_reg_var[15] = data_reg.read().range(7, 0); sbox_decrypt_o.write(decrypt_i.read()); sbox_data_o.write(0); next_state.write(state.read()); next_data_reg.write(data_reg.read()); next_ready_o.write(0); data_o.write(data_reg.read()); switch (state.read()) { case 0: if (start_i.read()) { sbox_data_o.write(data_array[0]); next_state.write(1); } break; case 16: data_reg_var[15] = sbox_data_i.read(); //Make shift rows stage switch (decrypt_i.read()) { case 0: shift_array_to_128(); break; case 1: invert_shift_array_to_128(); break; } next_data_reg.write(data_reg_128); next_ready_o.write(1); next_state.write(0); break; default: sbox_data_o.write(data_array[(int)state.read()]); data_reg_var[(int)state.read()-1] = sbox_data_i.read(); assign_array_to_128(); next_data_reg.write(data_reg_128); next_state.write(state.read() + 1); break; } } void subbytes::registers() { if (!reset.read()) { data_reg.write(0); state.write(0); ready_o.write(0); } else { data_reg.write(next_data_reg.read()); state.write(next_state.read()); ready_o.write(next_ready_o.read()); } }