| 1 |
13 |
jcastillo |
//////////////////////////////////////////////////////////////////////
|
| 2 |
|
|
//// ////
|
| 3 |
|
|
//// AES subbytes module implementation ////
|
| 4 |
|
|
//// ////
|
| 5 |
|
|
//// This file is part of the SystemC AES ////
|
| 6 |
|
|
//// ////
|
| 7 |
|
|
//// Description: ////
|
| 8 |
|
|
//// Subbytes stage implementation for AES algorithm ////
|
| 9 |
|
|
//// ////
|
| 10 |
|
|
//// To Do: ////
|
| 11 |
|
|
//// - done ////
|
| 12 |
|
|
//// ////
|
| 13 |
|
|
//// Author(s): ////
|
| 14 |
|
|
//// - Javier Castillo, jcastilo@opencores.org ////
|
| 15 |
|
|
//// ////
|
| 16 |
|
|
//////////////////////////////////////////////////////////////////////
|
| 17 |
|
|
//// ////
|
| 18 |
|
|
//// Copyright (C) 2000 Authors and OPENCORES.ORG ////
|
| 19 |
|
|
//// ////
|
| 20 |
|
|
//// This source file may be used and distributed without ////
|
| 21 |
|
|
//// restriction provided that this copyright statement is not ////
|
| 22 |
|
|
//// removed from the file and that any derivative work contains ////
|
| 23 |
|
|
//// the original copyright notice and the associated disclaimer. ////
|
| 24 |
|
|
//// ////
|
| 25 |
|
|
//// This source file is free software; you can redistribute it ////
|
| 26 |
|
|
//// and/or modify it under the terms of the GNU Lesser General ////
|
| 27 |
|
|
//// Public License as published by the Free Software Foundation; ////
|
| 28 |
|
|
//// either version 2.1 of the License, or (at your option) any ////
|
| 29 |
|
|
//// later version. ////
|
| 30 |
|
|
//// ////
|
| 31 |
|
|
//// This source is distributed in the hope that it will be ////
|
| 32 |
|
|
//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
|
| 33 |
|
|
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
|
| 34 |
|
|
//// PURPOSE. See the GNU Lesser General Public License for more ////
|
| 35 |
|
|
//// details. ////
|
| 36 |
|
|
//// ////
|
| 37 |
|
|
//// You should have received a copy of the GNU Lesser General ////
|
| 38 |
|
|
//// Public License along with this source; if not, download it ////
|
| 39 |
|
|
//// from http://www.opencores.org/lgpl.shtml ////
|
| 40 |
|
|
//// ////
|
| 41 |
|
|
//////////////////////////////////////////////////////////////////////
|
| 42 |
|
|
//
|
| 43 |
|
|
// CVS Revision History
|
| 44 |
|
|
//
|
| 45 |
|
|
// $Log: not supported by cvs2svn $
|
| 46 |
|
|
// Revision 1.2 2004/08/30 14:44:44 jcastillo
|
| 47 |
|
|
// Code Formater used to give better appearance to SystemC code
|
| 48 |
|
|
//
|
| 49 |
|
|
// Revision 1.1.1.1 2004/07/05 09:46:22 jcastillo
|
| 50 |
|
|
// First import
|
| 51 |
|
|
//
|
| 52 |
|
|
|
| 53 |
|
|
#include "subbytes.h"
|
| 54 |
|
|
|
| 55 |
|
|
|
| 56 |
|
|
void subbytes::sub()
|
| 57 |
|
|
{
|
| 58 |
|
|
|
| 59 |
|
|
sc_biguint<128> data_i_var, data_reg_128;
|
| 60 |
|
|
sc_uint<8> data_array[16], data_reg_var[16];
|
| 61 |
|
|
|
| 62 |
|
|
#define assign_array_to_128() \
|
| 63 |
|
|
{ \
|
| 64 |
|
|
data_reg_128.range(127,120)=data_reg_var[0]; \
|
| 65 |
|
|
data_reg_128.range(119,112)=data_reg_var[1]; \
|
| 66 |
|
|
data_reg_128.range(111,104)=data_reg_var[2]; \
|
| 67 |
|
|
data_reg_128.range(103,96)=data_reg_var[3]; \
|
| 68 |
|
|
data_reg_128.range(95,88)=data_reg_var[4]; \
|
| 69 |
|
|
data_reg_128.range(87,80)=data_reg_var[5]; \
|
| 70 |
|
|
data_reg_128.range(79,72)=data_reg_var[6]; \
|
| 71 |
|
|
data_reg_128.range(71,64)=data_reg_var[7]; \
|
| 72 |
|
|
data_reg_128.range(63,56)=data_reg_var[8]; \
|
| 73 |
|
|
data_reg_128.range(55,48)=data_reg_var[9]; \
|
| 74 |
|
|
data_reg_128.range(47,40)=data_reg_var[10]; \
|
| 75 |
|
|
data_reg_128.range(39,32)=data_reg_var[11]; \
|
| 76 |
|
|
data_reg_128.range(31,24)=data_reg_var[12]; \
|
| 77 |
|
|
data_reg_128.range(23,16)=data_reg_var[13]; \
|
| 78 |
|
|
data_reg_128.range(15,8)=data_reg_var[14]; \
|
| 79 |
|
|
data_reg_128.range(7,0)=data_reg_var[15]; \
|
| 80 |
|
|
}
|
| 81 |
|
|
|
| 82 |
|
|
#define shift_array_to_128() \
|
| 83 |
|
|
{ \
|
| 84 |
|
|
data_reg_128.range(127,120)=data_reg_var[0]; \
|
| 85 |
|
|
data_reg_128.range(119,112)=data_reg_var[5]; \
|
| 86 |
|
|
data_reg_128.range(111,104)=data_reg_var[10]; \
|
| 87 |
|
|
data_reg_128.range(103,96)=data_reg_var[15]; \
|
| 88 |
|
|
data_reg_128.range(95,88)=data_reg_var[4]; \
|
| 89 |
|
|
data_reg_128.range(87,80)=data_reg_var[9]; \
|
| 90 |
|
|
data_reg_128.range(79,72)=data_reg_var[14]; \
|
| 91 |
|
|
data_reg_128.range(71,64)=data_reg_var[3]; \
|
| 92 |
|
|
data_reg_128.range(63,56)=data_reg_var[8]; \
|
| 93 |
|
|
data_reg_128.range(55,48)=data_reg_var[13]; \
|
| 94 |
|
|
data_reg_128.range(47,40)=data_reg_var[2]; \
|
| 95 |
|
|
data_reg_128.range(39,32)=data_reg_var[7]; \
|
| 96 |
|
|
data_reg_128.range(31,24)=data_reg_var[12]; \
|
| 97 |
|
|
data_reg_128.range(23,16)=data_reg_var[1]; \
|
| 98 |
|
|
data_reg_128.range(15,8)=data_reg_var[6]; \
|
| 99 |
|
|
data_reg_128.range(7,0)=data_reg_var[11]; \
|
| 100 |
|
|
}
|
| 101 |
|
|
|
| 102 |
|
|
#define invert_shift_array_to_128() \
|
| 103 |
|
|
{ \
|
| 104 |
|
|
data_reg_128.range(127,120)=data_reg_var[0]; \
|
| 105 |
|
|
data_reg_128.range(119,112)=data_reg_var[13]; \
|
| 106 |
|
|
data_reg_128.range(111,104)=data_reg_var[10]; \
|
| 107 |
|
|
data_reg_128.range(103,96)=data_reg_var[7]; \
|
| 108 |
|
|
data_reg_128.range(95,88)=data_reg_var[4]; \
|
| 109 |
|
|
data_reg_128.range(87,80)=data_reg_var[1]; \
|
| 110 |
|
|
data_reg_128.range(79,72)=data_reg_var[14]; \
|
| 111 |
|
|
data_reg_128.range(71,64)=data_reg_var[11]; \
|
| 112 |
|
|
data_reg_128.range(63,56)=data_reg_var[8]; \
|
| 113 |
|
|
data_reg_128.range(55,48)=data_reg_var[5]; \
|
| 114 |
|
|
data_reg_128.range(47,40)=data_reg_var[2]; \
|
| 115 |
|
|
data_reg_128.range(39,32)=data_reg_var[15]; \
|
| 116 |
|
|
data_reg_128.range(31,24)=data_reg_var[12]; \
|
| 117 |
|
|
data_reg_128.range(23,16)=data_reg_var[9]; \
|
| 118 |
|
|
data_reg_128.range(15,8)=data_reg_var[6]; \
|
| 119 |
|
|
data_reg_128.range(7,0)=data_reg_var[3]; \
|
| 120 |
|
|
}
|
| 121 |
|
|
|
| 122 |
|
|
data_i_var = data_i.read();
|
| 123 |
|
|
|
| 124 |
|
|
data_array[0] = data_i_var.range(127, 120);
|
| 125 |
|
|
data_array[1] = data_i_var.range(119, 112);
|
| 126 |
|
|
data_array[2] = data_i_var.range(111, 104);
|
| 127 |
|
|
data_array[3] = data_i_var.range(103, 96);
|
| 128 |
|
|
data_array[4] = data_i_var.range(95, 88);
|
| 129 |
|
|
data_array[5] = data_i_var.range(87, 80);
|
| 130 |
|
|
data_array[6] = data_i_var.range(79, 72);
|
| 131 |
|
|
data_array[7] = data_i_var.range(71, 64);
|
| 132 |
|
|
data_array[8] = data_i_var.range(63, 56);
|
| 133 |
|
|
data_array[9] = data_i_var.range(55, 48);
|
| 134 |
|
|
data_array[10] = data_i_var.range(47, 40);
|
| 135 |
|
|
data_array[11] = data_i_var.range(39, 32);
|
| 136 |
|
|
data_array[12] = data_i_var.range(31, 24);
|
| 137 |
|
|
data_array[13] = data_i_var.range(23, 16);
|
| 138 |
|
|
data_array[14] = data_i_var.range(15, 8);
|
| 139 |
|
|
data_array[15] = data_i_var.range(7, 0);
|
| 140 |
|
|
|
| 141 |
|
|
data_reg_var[0] = data_reg.read().range(127, 120);
|
| 142 |
|
|
data_reg_var[1] = data_reg.read().range(119, 112);
|
| 143 |
|
|
data_reg_var[2] = data_reg.read().range(111, 104);
|
| 144 |
|
|
data_reg_var[3] = data_reg.read().range(103, 96);
|
| 145 |
|
|
data_reg_var[4] = data_reg.read().range(95, 88);
|
| 146 |
|
|
data_reg_var[5] = data_reg.read().range(87, 80);
|
| 147 |
|
|
data_reg_var[6] = data_reg.read().range(79, 72);
|
| 148 |
|
|
data_reg_var[7] = data_reg.read().range(71, 64);
|
| 149 |
|
|
data_reg_var[8] = data_reg.read().range(63, 56);
|
| 150 |
|
|
data_reg_var[9] = data_reg.read().range(55, 48);
|
| 151 |
|
|
data_reg_var[10] = data_reg.read().range(47, 40);
|
| 152 |
|
|
data_reg_var[11] = data_reg.read().range(39, 32);
|
| 153 |
|
|
data_reg_var[12] = data_reg.read().range(31, 24);
|
| 154 |
|
|
data_reg_var[13] = data_reg.read().range(23, 16);
|
| 155 |
|
|
data_reg_var[14] = data_reg.read().range(15, 8);
|
| 156 |
|
|
data_reg_var[15] = data_reg.read().range(7, 0);
|
| 157 |
|
|
|
| 158 |
|
|
|
| 159 |
|
|
sbox_decrypt_o.write(decrypt_i.read());
|
| 160 |
|
|
sbox_data_o.write(0);
|
| 161 |
|
|
next_state.write(state.read());
|
| 162 |
|
|
next_data_reg.write(data_reg.read());
|
| 163 |
|
|
|
| 164 |
|
|
next_ready_o.write(0);
|
| 165 |
|
|
data_o.write(data_reg.read());
|
| 166 |
|
|
|
| 167 |
|
|
switch (state.read())
|
| 168 |
|
|
{
|
| 169 |
|
|
|
| 170 |
|
|
case 0:
|
| 171 |
|
|
if (start_i.read())
|
| 172 |
|
|
{
|
| 173 |
|
|
sbox_data_o.write(data_array[0]);
|
| 174 |
|
|
next_state.write(1);
|
| 175 |
|
|
}
|
| 176 |
|
|
break;
|
| 177 |
|
|
case 16:
|
| 178 |
|
|
data_reg_var[15] = sbox_data_i.read();
|
| 179 |
|
|
//Make shift rows stage
|
| 180 |
|
|
switch (decrypt_i.read())
|
| 181 |
|
|
{
|
| 182 |
|
|
case 0:
|
| 183 |
|
|
shift_array_to_128();
|
| 184 |
|
|
break;
|
| 185 |
|
|
case 1:
|
| 186 |
|
|
invert_shift_array_to_128();
|
| 187 |
|
|
break;
|
| 188 |
|
|
}
|
| 189 |
|
|
next_data_reg.write(data_reg_128);
|
| 190 |
|
|
next_ready_o.write(1);
|
| 191 |
|
|
next_state.write(0);
|
| 192 |
|
|
break;
|
| 193 |
|
|
default:
|
| 194 |
|
|
sbox_data_o.write(data_array[(int)state.read()]);
|
| 195 |
|
|
data_reg_var[(int)state.read()-1] = sbox_data_i.read();
|
| 196 |
|
|
assign_array_to_128();
|
| 197 |
|
|
next_data_reg.write(data_reg_128);
|
| 198 |
|
|
next_state.write(state.read() + 1);
|
| 199 |
|
|
break;
|
| 200 |
|
|
}
|
| 201 |
|
|
}
|
| 202 |
|
|
|
| 203 |
|
|
void subbytes::registers()
|
| 204 |
|
|
{
|
| 205 |
|
|
if (!reset.read())
|
| 206 |
|
|
{
|
| 207 |
|
|
data_reg.write(0);
|
| 208 |
|
|
state.write(0);
|
| 209 |
|
|
ready_o.write(0);
|
| 210 |
|
|
}
|
| 211 |
|
|
else
|
| 212 |
|
|
{
|
| 213 |
|
|
data_reg.write(next_data_reg.read());
|
| 214 |
|
|
state.write(next_state.read());
|
| 215 |
|
|
ready_o.write(next_ready_o.read());
|
| 216 |
|
|
}
|
| 217 |
|
|
}
|
