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+//////////////////////////////////////////////////////////////////////
+//// ////
+//// AES top file ////
+//// ////
+//// This file is part of the SystemC AES ////
+//// ////
+//// Description: ////
+//// AES top ////
+//// ////
+//// 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: aes.v,v $
+// Revision 1.1.1.1 2004/07/05 09:46:23 jcastillo
+// First import
+//
+
+module aes(clk,reset,load_i,decrypt_i,data_i,key_i,ready_o,data_o);
+input clk;
+input reset;
+input load_i;
+input decrypt_i;
+input [127:0] data_i;
+input [127:0] key_i;
+output ready_o;
+output [127:0] data_o;
+
+reg ready_o;
+reg [127:0] data_o;
+
+reg next_ready_o;
+reg keysched_start_i;
+reg [3:0] keysched_round_i;
+reg [127:0] keysched_last_key_i;
+wire [127:0] keysched_new_key_o;
+
+wire keysched_ready_o;
+
+wire keysched_sbox_access_o;
+
+wire [7:0] keysched_sbox_data_o;
+
+wire keysched_sbox_decrypt_o;
+
+reg mixcol_start_i;
+reg [127:0] mixcol_data_i;
+wire mixcol_ready_o;
+
+wire [127:0] mixcol_data_o;
+
+reg subbytes_start_i;
+reg [127:0] subbytes_data_i;
+wire subbytes_ready_o;
+
+wire [127:0] subbytes_data_o;
+
+wire [7:0] subbytes_sbox_data_o;
+
+wire subbytes_sbox_decrypt_o;
+
+wire [7:0] sbox_data_o;
+
+reg [7:0] sbox_data_i;
+reg sbox_decrypt_i;
+reg state;
+reg next_state;
+reg [3:0] round;
+reg [3:0] next_round;
+reg [127:0] addroundkey_data_o;
+reg [127:0] next_addroundkey_data_reg;
+reg [127:0] addroundkey_data_reg;
+reg [127:0] addroundkey_data_i;
+reg addroundkey_ready_o;
+reg next_addroundkey_ready_o;
+reg addroundkey_start_i;
+reg next_addroundkey_start_i;
+reg [3:0] addroundkey_round;
+reg [3:0] next_addroundkey_round;
+reg first_round_reg;
+reg next_first_round_reg;
+
+sbox sbox1 (.clk(clk), .reset(reset), .data_i(sbox_data_i), .decrypt_i(sbox_decrypt_i), .data_o(sbox_data_o));
+subbytes sub1 (.clk(clk), .reset(reset), .start_i(subbytes_start_i), .decrypt_i(decrypt_i), .data_i(subbytes_data_i), .ready_o(subbytes_ready_o), .data_o(subbytes_data_o), .sbox_data_o(subbytes_sbox_data_o), .sbox_data_i(sbox_data_o), .sbox_decrypt_o(subbytes_sbox_decrypt_o));
+mixcolum mix1 (.clk(clk), .reset(reset), .decrypt_i(decrypt_i), .start_i(mixcol_start_i), .data_i(mixcol_data_i), .ready_o(mixcol_ready_o), .data_o(mixcol_data_o));
+keysched ks1 (.clk(clk), .reset(reset), .start_i(keysched_start_i), .round_i(keysched_round_i), .last_key_i(keysched_last_key_i), .new_key_o(keysched_new_key_o), .ready_o(keysched_ready_o), .sbox_access_o(keysched_sbox_access_o), .sbox_data_o(keysched_sbox_data_o), .sbox_data_i(sbox_data_o), .sbox_decrypt_o(keysched_sbox_decrypt_o));
+
+//registers:
+always @(posedge clk or negedge reset)
+
+begin
+
+ if(!reset)
+begin
+
+ state = (0);
+ ready_o = (0);
+ round = (0);
+ addroundkey_round = (0);
+ addroundkey_data_reg = (0);
+ addroundkey_ready_o = (0);
+ addroundkey_start_i = (0);
+ first_round_reg = (0);
+
+end
+else
+begin
+
+ state = (next_state);
+ ready_o = (next_ready_o);
+ round = (next_round);
+ addroundkey_round = (next_addroundkey_round);
+ addroundkey_data_reg = (next_addroundkey_data_reg);
+ addroundkey_ready_o = (next_addroundkey_ready_o);
+ first_round_reg = (next_first_round_reg);
+ addroundkey_start_i = (next_addroundkey_start_i);
+
+end
+
+
+end
+//control:
+always @( state or round or addroundkey_data_o or data_i or load_i or decrypt_i or addroundkey_ready_o or mixcol_ready_o or subbytes_ready_o or subbytes_data_o or mixcol_data_o or first_round_reg)
+
+begin
+
+
+ next_state = (state);
+ next_round = (round);
+ data_o = (addroundkey_data_o);
+ next_ready_o = (0);
+
+ //Tokeyschedulemodule
+
+ next_first_round_reg = (0);
+
+
+ subbytes_data_i = (0);
+ mixcol_data_i = (0);
+ addroundkey_data_i = (0);
+ next_addroundkey_start_i = (first_round_reg);
+ mixcol_start_i = ((addroundkey_ready_o&decrypt_i&round!=10)|(subbytes_ready_o&!decrypt_i));
+ subbytes_start_i = ((addroundkey_ready_o&!decrypt_i)|(mixcol_ready_o&decrypt_i)|(addroundkey_ready_o&decrypt_i&round==10));
+
+ if(decrypt_i&&round!=10)
+ begin
+ addroundkey_data_i = (subbytes_data_o);
+ subbytes_data_i = (mixcol_data_o);
+ mixcol_data_i = (addroundkey_data_o);
+ end
+ else if(!decrypt_i&&round!=0)
+ begin
+ addroundkey_data_i = (mixcol_data_o);
+ subbytes_data_i = (addroundkey_data_o);
+ mixcol_data_i = (subbytes_data_o);
+ end
+ else
+ begin
+ mixcol_data_i = (subbytes_data_o);
+ subbytes_data_i = (addroundkey_data_o);
+ addroundkey_data_i = (data_i);
+ end
+
+
+ case(state)
+
+ 0:
+ begin
+ if(load_i)
+ begin
+ next_state = (1);
+ if(decrypt_i)
+ next_round = (10);
+ else
+ next_round = (0);
+ next_first_round_reg = (1);
+ end
+ end
+
+ 1:
+ begin
+
+ //Counter
+ if(!decrypt_i&&mixcol_ready_o)
+ begin
+ next_addroundkey_start_i = (1);
+ addroundkey_data_i = (mixcol_data_o);
+ next_round = (round+1);
+ end
+ else if(decrypt_i&&subbytes_ready_o)
+ begin
+ next_addroundkey_start_i = (1);
+ addroundkey_data_i = (subbytes_data_o);
+ next_round = (round-1);
+ end
+
+ //Output
+ if((round==9&&!decrypt_i)||(round==0&&decrypt_i))
+ begin
+ next_addroundkey_start_i = (0);
+ mixcol_start_i = (0);
+ if(subbytes_ready_o)
+ begin
+ addroundkey_data_i = (subbytes_data_o);
+ next_addroundkey_start_i = (1);
+ next_round = (round+1);
+ end
+ end
+
+ if((round==10&&!decrypt_i)||(round==0&&decrypt_i))
+ begin
+ addroundkey_data_i = (subbytes_data_o);
+ subbytes_start_i = (0);
+ if(addroundkey_ready_o)
+ begin
+ next_ready_o = (1);
+ next_state = (0);
+ next_addroundkey_start_i = (0);
+ next_round = (0);
+ end
+
+ end
+
+
+ end
+
+ default:
+begin
+ next_state = (0);
+ end
+ endcase
+
+
+end
+//addroundkey:
+reg[127:0] data_var,round_data_var,round_key_var;
+always @( addroundkey_data_i or addroundkey_start_i or addroundkey_data_reg or addroundkey_round or keysched_new_key_o or keysched_ready_o or key_i or round)
+
+begin
+
+
+
+ round_data_var=addroundkey_data_reg;
+ next_addroundkey_data_reg = (addroundkey_data_reg);
+next_addroundkey_ready_o = (0);
+ next_addroundkey_round = (addroundkey_round);
+ addroundkey_data_o = (addroundkey_data_reg);
+
+ if(addroundkey_round==1||addroundkey_round==0)
+ keysched_last_key_i = (key_i);
+else
+ keysched_last_key_i = (keysched_new_key_o);
+
+ keysched_start_i = (0);
+
+ keysched_round_i = (addroundkey_round);
+
+ if(round==0&&addroundkey_start_i)
+begin
+
+ //Taketheinputandxorthemwithdataifround==0;
+ data_var=addroundkey_data_i;
+ round_key_var=key_i;
+ round_data_var=round_key_var^data_var;
+ next_addroundkey_data_reg = (round_data_var);
+next_addroundkey_ready_o = (1);
+
+end
+else if(addroundkey_start_i&&round!=0)
+begin
+
+ keysched_last_key_i = (key_i);
+ keysched_start_i = (1);
+ keysched_round_i = (1);
+ next_addroundkey_round = (1);
+
+end
+else if(addroundkey_round!=round&&keysched_ready_o)
+begin
+
+next_addroundkey_round = (addroundkey_round+1);
+ keysched_last_key_i = (keysched_new_key_o);
+ keysched_start_i = (1);
+ keysched_round_i = (addroundkey_round+1);
+
+end
+else if(addroundkey_round==round&&keysched_ready_o)
+begin
+
+ data_var=addroundkey_data_i;
+ round_key_var=keysched_new_key_o;
+ round_data_var=round_key_var^data_var;
+ next_addroundkey_data_reg = (round_data_var);
+next_addroundkey_ready_o = (1);
+ next_addroundkey_round = (0);
+
+end
+
+
+end
+//sbox_muxes:
+always @( keysched_sbox_access_o or keysched_sbox_decrypt_o or keysched_sbox_data_o or subbytes_sbox_decrypt_o or subbytes_sbox_data_o)
+
+begin
+
+
+ if(keysched_sbox_access_o)
+begin
+
+ sbox_decrypt_i = (keysched_sbox_decrypt_o);
+ sbox_data_i = (keysched_sbox_data_o);
+
+end
+else
+begin
+
+ sbox_decrypt_i = (subbytes_sbox_decrypt_o);
+sbox_data_i = (subbytes_sbox_data_o);
+
+end
+
+
+end
+
+endmodule
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