tests/simple/aes_kexp128.v

   1
   2 // test taken from aes_core from iwls2005
   3
   4 module aes_key_expand_128(clk, kld, key, wo_0, wo_1, wo_2, wo_3);
   5
   6 input           clk, kld;
   7 input   [15:0]  key;
   8 output  [3:0]   wo_0, wo_1, wo_2, wo_3;
   9 reg     [3:0]   w[3:0];
  10
  11 assign wo_0 = w[0];
  12 assign wo_1 = w[1];
  13 assign wo_2 = w[2];
  14 assign wo_3 = w[3];
  15
  16 always @(posedge clk) begin
  17         w[0] <= kld ? key[15:12] : w[0];
  18         w[1] <= kld ? key[11: 8] : w[0]^w[1];
  19         w[2] <= kld ? key[ 7: 4] : w[0]^w[1]^w[2];
  20         w[3] <= kld ? key[ 3: 0] : w[0]^w[1]^w[2]^w[3];
  21 end
  22
  23 endmodule
  24