Subversion Repositories aes-encryption

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////                                                             ////

////  AES RCON Block                                             ////

////                                                             ////

////                                                             ////

////  Author: Rudolf Usselmann                                   ////

////          rudi@asics.ws                                      ////

////                                                             ////

////                                                             ////

////                                                             ////

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////                                                             ////

//// 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.                                 ////

////                                                             ////

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`timescale 1 ns/1 ps

module aes_rcon(clk,out,out2,out3,out4,out5,out6,out7,out8,out9,out10);

input           clk;

output [7:0] out,out2,out3,out4,out5,out6,out7,out8,out9,out10;

assign          out  = frcon(0);

assign          out2 = frcon(1);

assign          out3 = frcon(2);

assign          out4 = frcon(3);

assign          out5 = frcon(4);

assign          out6 = frcon(5);

assign          out7 = frcon(6);

assign          out8 = frcon(7);

assign          out9 = frcon(8);

assign          out10 = frcon(9);

function [7:0]   frcon;

input   [3:0]    i;

case(i) // synopsys parallel_case

   4'h0: frcon=8'h01;           //1

   4'h1: frcon=8'h02;           //x

   4'h2: frcon=8'h04;           //x^2

   4'h3: frcon=8'h08;           //x^3

   4'h4: frcon=8'h10;           //x^4

   4'h5: frcon=8'h20;           //x^5

   4'h6: frcon=8'h40;           //x^6

   4'h7: frcon=8'h80;           //x^7

   4'h8: frcon=8'h1b;           //x^8

   4'h9: frcon=8'h36;           //x^9

   default: frcon=8'h00;

endcase

endfunction

endmodule