| ///////////////////////////////////////////////////////////////////// |
| //// //// |
| //// AES Key Expand Block (for 128 bit keys) //// |
| //// //// |
| //// //// |
| //// Author: Rudolf Usselmann //// |
| //// rudi@asics.ws //// |
| //// //// |
| //// //// |
| //// Downloaded from: http://www.opencores.org/cores/aes_core/ //// |
| //// //// |
| ///////////////////////////////////////////////////////////////////// |
| //// //// |
| //// Copyright (C) 2000-2002 Rudolf Usselmann //// |
| //// www.asics.ws //// |
| //// rudi@asics.ws //// |
| //// //// |
| //// 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 SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY //// |
| //// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED //// |
| //// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS //// |
| //// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR //// |
| //// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, //// |
| //// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES //// |
| //// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE //// |
| //// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR //// |
| //// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF //// |
| //// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT //// |
| //// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT //// |
| //// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE //// |
| //// POSSIBILITY OF SUCH DAMAGE. //// |
| //// //// |
| ///////////////////////////////////////////////////////////////////// |
| |
| // CVS Log |
| // |
| // $Id: aes_key_expand_128.v,v 1.1.1.1 2002-11-09 11:22:38 rudi Exp $ |
| // |
| // $Date: 2002-11-09 11:22:38 $ |
| // $Revision: 1.1.1.1 $ |
| // $Author: rudi $ |
| // $Locker: $ |
| // $State: Exp $ |
| // |
| // Change History: |
| // $Log: not supported by cvs2svn $ |
| // |
| // |
| // |
| // |
| // |
| |
| module aes_key_expand_128(clk, kld, key, wo_0, wo_1, wo_2, wo_3); |
| input clk; |
| input kld; |
| input [127:0] key; |
| output [31:0] wo_0, wo_1, wo_2, wo_3; |
| reg [31:0] w[3:0]; |
| wire [31:0] tmp_w; |
| wire [31:0] subword; |
| wire [31:0] rcon; |
| |
| assign wo_0 = w[0]; |
| assign wo_1 = w[1]; |
| assign wo_2 = w[2]; |
| assign wo_3 = w[3]; |
| always @(posedge clk) w[0] <= #1 kld ? key[127:096] : w[0]^subword^rcon; |
| always @(posedge clk) w[1] <= #1 kld ? key[095:064] : w[0]^w[1]^subword^rcon; |
| always @(posedge clk) w[2] <= #1 kld ? key[063:032] : w[0]^w[2]^w[1]^subword^rcon; |
| always @(posedge clk) w[3] <= #1 kld ? key[031:000] : w[0]^w[3]^w[2]^w[1]^subword^rcon; |
| assign tmp_w = w[3]; |
| aes_sbox u0( .a(tmp_w[23:16]), .d(subword[31:24])); |
| aes_sbox u1( .a(tmp_w[15:08]), .d(subword[23:16])); |
| aes_sbox u2( .a(tmp_w[07:00]), .d(subword[15:08])); |
| aes_sbox u3( .a(tmp_w[31:24]), .d(subword[07:00])); |
| aes_rcon r0( .clk(clk), .kld(kld), .out(rcon)); |
| endmodule |
| |
