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-//////////////////////////////////////////////////////////////////////
-//// ////
-//// Subbytes module implementation ////
-//// ////
-//// This file is part of the SystemC AES ////
-//// ////
-//// Description: ////
-//// Subbytes module implementation ////
-//// ////
-//// 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: subbytes.v,v $
-// Revision 1.1.1.1 2004/07/05 09:46:23 jcastillo
-// First import
-//
-
-module subbytes(clk,reset,start_i,decrypt_i,data_i,ready_o,data_o,sbox_data_o,sbox_data_i,sbox_decrypt_o);
-input clk;
-input reset;
-input start_i;
-input decrypt_i;
-input [127:0] data_i;
-output ready_o;
-output [127:0] data_o;
-output [7:0] sbox_data_o;
-input [7:0] sbox_data_i;
-output sbox_decrypt_o;
-
-reg ready_o;
-reg [127:0] data_o;
-reg [7:0] sbox_data_o;
-reg sbox_decrypt_o;
-
-reg [4:0] state;
-reg [4:0] next_state;
-reg [127:0] data_reg;
-reg [127:0] next_data_reg;
-reg next_ready_o;
-
-`define assign_array_to_128 \
- data_reg_128[127:120]=data_reg_var[0]; \
- data_reg_128[119:112]=data_reg_var[1]; \
- data_reg_128[111:104]=data_reg_var[2]; \
- data_reg_128[103:96]=data_reg_var[3]; \
- data_reg_128[95:88]=data_reg_var[4]; \
- data_reg_128[87:80]=data_reg_var[5]; \
- data_reg_128[79:72]=data_reg_var[6]; \
- data_reg_128[71:64]=data_reg_var[7]; \
- data_reg_128[63:56]=data_reg_var[8]; \
- data_reg_128[55:48]=data_reg_var[9]; \
- data_reg_128[47:40]=data_reg_var[10]; \
- data_reg_128[39:32]=data_reg_var[11]; \
- data_reg_128[31:24]=data_reg_var[12]; \
- data_reg_128[23:16]=data_reg_var[13]; \
- data_reg_128[15:8]=data_reg_var[14]; \
- data_reg_128[7:0]=data_reg_var[15];
-
-`define shift_array_to_128 \
- data_reg_128[127:120]=data_reg_var[0]; \
- data_reg_128[119:112]=data_reg_var[5]; \
- data_reg_128[111:104]=data_reg_var[10]; \
- data_reg_128[103:96]=data_reg_var[15]; \
- data_reg_128[95:88]=data_reg_var[4]; \
- data_reg_128[87:80]=data_reg_var[9]; \
- data_reg_128[79:72]=data_reg_var[14]; \
- data_reg_128[71:64]=data_reg_var[3]; \
- data_reg_128[63:56]=data_reg_var[8]; \
- data_reg_128[55:48]=data_reg_var[13]; \
- data_reg_128[47:40]=data_reg_var[2]; \
- data_reg_128[39:32]=data_reg_var[7]; \
- data_reg_128[31:24]=data_reg_var[12]; \
- data_reg_128[23:16]=data_reg_var[1]; \
- data_reg_128[15:8]=data_reg_var[6]; \
- data_reg_128[7:0]=data_reg_var[11];
-
-`define invert_shift_array_to_128 \
- data_reg_128[127:120]=data_reg_var[0]; \
- data_reg_128[119:112]=data_reg_var[13]; \
- data_reg_128[111:104]=data_reg_var[10]; \
- data_reg_128[103:96]=data_reg_var[7]; \
- data_reg_128[95:88]=data_reg_var[4]; \
- data_reg_128[87:80]=data_reg_var[1]; \
- data_reg_128[79:72]=data_reg_var[14]; \
- data_reg_128[71:64]=data_reg_var[11]; \
- data_reg_128[63:56]=data_reg_var[8]; \
- data_reg_128[55:48]=data_reg_var[5]; \
- data_reg_128[47:40]=data_reg_var[2]; \
- data_reg_128[39:32]=data_reg_var[15]; \
- data_reg_128[31:24]=data_reg_var[12]; \
- data_reg_128[23:16]=data_reg_var[9]; \
- data_reg_128[15:8]=data_reg_var[6]; \
- data_reg_128[7:0]=data_reg_var[3];
-
-
-//registers:
-always @(posedge clk or negedge reset)
-
-begin
-
-if(!reset)
-begin
-
- data_reg = (0);
- state = (0);
- ready_o = (0);
-
-end
-else
-begin
-
- data_reg = (next_data_reg);
- state = (next_state);
- ready_o = (next_ready_o);
-
-end
-
-
-end
-//sub:
-reg[127:0] data_i_var,data_reg_128;
-reg[7:0] data_array[15:0],data_reg_var[15:0];
-
-always @( decrypt_i or start_i or state or data_i or sbox_data_i or data_reg)
-
-begin
-
-
- data_i_var=data_i;
-
- data_array[0]=data_i_var[127:120];
- data_array[1]=data_i_var[119:112];
- data_array[2]=data_i_var[111:104];
- data_array[3]=data_i_var[103:96];
- data_array[4]=data_i_var[95:88];
- data_array[5]=data_i_var[87:80];
- data_array[6]=data_i_var[79:72];
- data_array[7]=data_i_var[71:64];
- data_array[8]=data_i_var[63:56];
- data_array[9]=data_i_var[55:48];
- data_array[10]=data_i_var[47:40];
- data_array[11]=data_i_var[39:32];
- data_array[12]=data_i_var[31:24];
- data_array[13]=data_i_var[23:16];
- data_array[14]=data_i_var[15:8];
- data_array[15]=data_i_var[7:0];
-
- data_reg_var[0]=data_reg[127:120];
- data_reg_var[1]=data_reg[119:112];
- data_reg_var[2]=data_reg[111:104];
- data_reg_var[3]=data_reg[103:96];
- data_reg_var[4]=data_reg[95:88];
- data_reg_var[5]=data_reg[87:80];
- data_reg_var[6]=data_reg[79:72];
- data_reg_var[7]=data_reg[71:64];
- data_reg_var[8]=data_reg[63:56];
- data_reg_var[9]=data_reg[55:48];
- data_reg_var[10]=data_reg[47:40];
- data_reg_var[11]=data_reg[39:32];
- data_reg_var[12]=data_reg[31:24];
- data_reg_var[13]=data_reg[23:16];
- data_reg_var[14]=data_reg[15:8];
- data_reg_var[15]=data_reg[7:0];
-
-
- sbox_decrypt_o = (decrypt_i);
- sbox_data_o = (0);
- next_state = (state);
- next_data_reg = (data_reg);
-
- next_ready_o = (0);
- data_o = (data_reg);
-
- case(state)
-
- 0:
-begin
- if(start_i)
-begin
-
-sbox_data_o = (data_array[0]);
- next_state = (1);
-
-end
-
- end
- 16:
-begin
- data_reg_var[15]=sbox_data_i;
- //Makeshiftrowsstage
- case(decrypt_i)
- 0:
- begin
- `shift_array_to_128
- end
- 1:
- begin
- `invert_shift_array_to_128
- end
- endcase
-
- next_data_reg = (data_reg_128);
- next_ready_o = (1);
- next_state = (0);
- end
- default:
- begin
- /* original version (causing troubles with synopsys formality):
- sbox_data_o = (data_array[state]);
- data_reg_var[state-1]=sbox_data_i;
- improved version: */
- sbox_data_o = (data_array[state & 15]);
- data_reg_var[(state-1) & 15]=sbox_data_i;
- /* end of improved version */
- `assign_array_to_128
- next_data_reg = (data_reg_128);
- next_state = (state+1);
- end
-
-endcase
-
-
-end
-
-endmodule
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