cryptography ip-cores in vhdl / verilog
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// ======================================================================
// DES encryption/decryption testbench
// tests according to NIST 800-17 special publication
// Copyright (C) 2012 Torsten Meissner
//-----------------------------------------------------------------------
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
// ======================================================================
`timescale 1ns/1ps
module tb_tdes;
// set dumpfile
initial begin
$dumpfile ("tb_tdes.vcd");
$dumpvars (0, tb_tdes);
end
reg reset;
reg clk = 0;
reg mode;
reg [0:63] key1;
reg [0:63] key2;
reg [0:63] key3;
reg [0:63] datain;
reg validin;
integer index;
integer outdex;
integer errors;
wire [0:63] dataout;
wire validout;
wire ready;
reg [0:63] test_data [0:18];
reg [0:63] test_answers [0:18];
// read in test data files
initial begin
$readmemh("test_data.txt", test_data);
end
// setup simulation
initial begin
reset = 1;
#1 reset = 0;
#20 reset = 1;
end
// generate clock with 100 mhz
always #5 clk = !clk;
// init the register values
initial
forever @(negedge reset) begin
//disable stimuli;
disable checker;
mode <= 0;
validin <= 0;
key1 <= 0;
key2 <= 0;
key3 <= 0;
datain <= 0;
errors = 0;
end
// stimuli generator process
initial
forever @(negedge reset) begin
index = 0;
wait (reset);
while (index < 19) begin
@(posedge clk)
if (ready) begin
mode <= 0;
validin <= 1;
datain <= test_data[index];
key1 <= 64'h1111111111111111;
key2 <= 64'h5555555555555555;
key3 <= 64'h9999999999999999;
index = index + 1;
@(posedge clk)
validin <= 0;
end
end
index = 0;
while (index < 19) begin
@(posedge clk)
if (ready) begin
mode <= 1;
validin <= 1;
datain <= test_answers[index];
key1 <= 64'h1111111111111111;
key2 <= 64'h5555555555555555;
key3 <= 64'h9999999999999999;
index = index + 1;
@(posedge clk)
validin <= 0;
end
end
@(posedge clk)
validin <= 0;
mode <= 0;
datain <= 0;
key1 <= 0;
key2 <= 0;
key3 <= 0;
end
// checker process
always begin : checker
wait (reset)
outdex = 0;
// encryption tests
outdex = 0;
while (outdex < 19) begin
@(posedge clk)
if (validout) begin
test_answers[outdex] = dataout;
outdex = outdex + 1;
end
end
// decryption tests
outdex = 0;
while (outdex < 19) begin
@(posedge clk)
if (validout) begin
// detected an error -> print error message
// increment error counter
if (dataout != test_data[outdex]) begin
$display ("error, output was %h - should have been %h", dataout, test_data[outdex]);
errors = errors + 1;
end
outdex = outdex + 1;
end
end
if (errors) begin
$display ("simulation finished, %0d errors detected :(", errors);
end else begin
$display ("simulation tests finished, no errors detected :)");
end
$display ("#############");
@(posedge clk)
$finish;
end
// dut
tdes i_tdes (
.reset_i(reset),
.clk_i(clk),
.mode_i(mode),
.key1_i(key1),
.key2_i(key2),
.key3_i(key3),
.data_i(datain),
.valid_i(validin),
.data_o(dataout),
.valid_o(validout),
.ready_o(ready)
);
endmodule