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111 lines
2.8 KiB
111 lines
2.8 KiB
// ======================================================================
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// DES encryption/decryption testbench
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// tests according to NIST 800-17 special publication
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// Copyright (C) 2012 Torsten Meissner
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//-----------------------------------------------------------------------
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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// ======================================================================
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module tb_des;
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initial begin
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$dumpfile ("tb_des.vcd");
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$dumpvars (0, tb_des);
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end
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reg reset;
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reg clk = 0;
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reg mode;
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reg [0:63] key;
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reg [0:63] datain;
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reg validin;
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integer index;
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integer outdex;
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wire [0:63] dataout;
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wire validout;
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reg [0:63] variable_plaintext_known_answers [0:63];
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initial begin
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$readmemh("stimuli.txt", variable_plaintext_known_answers);
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end
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initial begin
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reset = 1;
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#1 reset = 0;
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#20 reset = 1;
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#1000 $finish;
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end
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always #5 clk = !clk;
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initial
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forever @(negedge reset) begin
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disable stimuli;
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disable checker;
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mode <= 0;
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validin <= 0;
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key <= 0;
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datain <= 0;
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end
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always begin : stimuli
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wait (reset)
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@(posedge clk)
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// Variable plaintext known answer test
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datain <= 64'h8000000000000000;
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mode <= 0;
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validin <= 1;
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key <= 64'h0101010101010101;
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for(index = 0; index < 64; index = index + 1)
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begin
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@(posedge clk)
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datain <= {1'b0, datain[0:62]};
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end
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validin <= 0;
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end
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always begin : checker
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wait (reset)
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// Variable plaintext known answer test
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wait (validout)
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for(outdex = 0; outdex < 64; outdex = outdex + 1)
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begin
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@(posedge clk)
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if (dataout == variable_plaintext_known_answers[outdex]) begin
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$display ("okay");
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end else begin
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$display ("error, output was %h - should have been %h", dataout, variable_plaintext_known_answers[outdex]);
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end
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end
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@(posedge clk)
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$finish;
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end
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des i_des (
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.reset_i(reset),
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.clk_i(clk),
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.mode_i(mode),
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.key_i(key),
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.data_i(datain),
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.valid_i(validin),
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.data_o(dataout),
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.valid_o(validout)
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);
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endmodule
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