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Diffstat (limited to 'tests/iwls2005/systemcaes/keysched.v')
| -rw-r--r-- | tests/iwls2005/systemcaes/keysched.v | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/tests/iwls2005/systemcaes/keysched.v b/tests/iwls2005/systemcaes/keysched.v new file mode 100644 index 000000000..f242c5675 --- /dev/null +++ b/tests/iwls2005/systemcaes/keysched.v @@ -0,0 +1,248 @@ +////////////////////////////////////////////////////////////////////// +//// //// +//// Key schedule //// +//// //// +//// This file is part of the SystemC AES //// +//// //// +//// Description: //// +//// Generate the next round key from the previous one //// +//// //// +//// 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: keysched.v,v $ +// Revision 1.1.1.1 2004/07/05 09:46:23 jcastillo +// First import +// + +module keysched(clk,reset,start_i,round_i,last_key_i,new_key_o,ready_o,sbox_access_o,sbox_data_o,sbox_data_i,sbox_decrypt_o); +input clk; +input reset; +input start_i; +input [3:0] round_i; +input [127:0] last_key_i; +output [127:0] new_key_o; +output ready_o; +output sbox_access_o; +output [7:0] sbox_data_o; +input [7:0] sbox_data_i; +output sbox_decrypt_o; + +reg [127:0] new_key_o; +reg ready_o; +reg sbox_access_o; +reg [7:0] sbox_data_o; +reg sbox_decrypt_o; + +reg [2:0] next_state; +reg [2:0] state; +reg [7:0] rcon_o; +reg [31:0] next_col; +reg [31:0] col; +reg [127:0] key_reg; +reg [127:0] next_key_reg; +reg next_ready_o; + + +//rcon: +always @( round_i) + +begin + + + case(round_i) + 1: +begin +rcon_o = (1); +end + 2: +begin +rcon_o = (2); +end + 3: +begin +rcon_o = (4); +end + 4: +begin +rcon_o = (8); +end + 5: +begin +rcon_o = ('h10); +end + 6: +begin +rcon_o = ('h20); +end + 7: +begin +rcon_o = ('h40); +end + 8: +begin +rcon_o = ('h80); +end + 9: +begin +rcon_o = ('h1B); +end + 10: +begin +rcon_o = ('h36); +end +default: +begin + rcon_o = (0); +end + endcase + + +end +//registers: +always @(posedge clk or negedge reset) + +begin + + if(!reset) + begin + state = (0); + col = (0); + key_reg = (0); + ready_o = (0); + end +else + begin + state = (next_state); + col = (next_col); + key_reg = (next_key_reg); + ready_o = (next_ready_o); + end + + +end +//generate_key: +reg[127:0] K_var,W_var; + reg[31:0] col_t; + reg[23:0] zero; + +always @( start_i or last_key_i or sbox_data_i or state or rcon_o or col or key_reg) + +begin + + + zero=0; + + col_t=col; + W_var=0; + + next_state = (state); + next_col = (col); + + next_ready_o = (0); + next_key_reg = (key_reg); + new_key_o = (key_reg); + +sbox_decrypt_o = (0); + sbox_access_o = (0); + sbox_data_o = (0); + K_var=last_key_i; + + case(state) + //Substitutethebyteswhilerotatingthem + //FouraccessestoSBoxareneeded + 0: +begin + if(start_i) +begin + + col_t=0; + sbox_access_o = (1); + sbox_data_o = (K_var[31:24]); + next_state = (1); + +end + + end + 1: +begin + sbox_access_o = (1); + sbox_data_o = (K_var[23:16]); + col_t[7:0]=sbox_data_i; + next_col = (col_t); + next_state = (2); + end + 2: +begin + sbox_access_o = (1); + sbox_data_o = (K_var[15:8]); + col_t[31:24]=sbox_data_i; + next_col = (col_t); + next_state = (3); + end + 3: +begin + sbox_access_o = (1); + sbox_data_o = (K_var[7:0]); + col_t[23:16]=sbox_data_i; + next_col = (col_t); + next_state = (4); + end + 4: +begin + sbox_access_o = (1); + col_t[15:8]=sbox_data_i; + next_col = (col_t); + W_var[127:96]=col_t^K_var[127:96]^{rcon_o,zero}; + W_var[95:64]=W_var[127:96]^K_var[95:64]; + W_var[63:32]=W_var[95:64]^K_var[63:32]; + W_var[31:0]=W_var[63:32]^K_var[31:0]; +next_ready_o = (1); +next_key_reg = (W_var); + next_state = (0); + end + +default: +begin + next_state = (0); + end +endcase + + +end + +endmodule |