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-//======================================================================
-//
-// Copyright (c) 2016, NORDUnet A/S All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions
-// are met:
-// - Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//
-// - Redistributions in binary form must reproduce the above copyright
-// notice, this list of conditions and the following disclaimer in the
-// documentation and/or other materials provided with the distribution.
-//
-// - Neither the name of the NORDUnet nor the names of its contributors may
-// be used to endorse or promote products derived from this software
-// without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// HOLDER 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.
-//
-//======================================================================
-
-`timescale 1ns / 1ps
-
-module tb_modexpa7_top;
-
-
- //
- // Settings
- //
- localparam MAX_MODULUS_WIDTH = 256;
-
-
- //
- // Control Registers
- //
- reg use_public_mode;
- reg [ 8: 0] modulus_width;
- reg [ 8: 0] exponent_width;
-
-
- //
- // Test Vectors (128-bit)
- //
- localparam [127:0] M_TEST_128 = 128'h0001FF00544553545445535454455354;
- localparam [127:0] M_ABC_128 = 128'h0001FFFFFFFF00414243414243414243;
- localparam [127:0] M_XYZ_128 = 128'h0001FFFFFFFF0058595A58595A58595A;
-
- localparam [127:0] N_1_128 = 128'h56247F8A1582CD1C96ED0ECD3E60FCB1;
- localparam [127:0] N_2_128 = 128'h708CC1BEA087DCA3D0999E3AC033A50B;
- localparam [127:0] D_1_128 = 128'h40C9E4AEEB6CDC6D12E4526089BCB8FD;
- localparam [127:0] D_2_128 = 128'h1ADFF16F74639CB28976EEC528C866C1;
-
- localparam [127:0] S_TEST_1_128 = 128'h310AB3124D4CB1DEE1CFA4694DC8BCA2;
- localparam [127:0] S_TEST_2_128 = 128'h5D621FC2642AEB705FDB7B90693FE3BF;
- localparam [127:0] S_ABC_1_128 = 128'h235EA2712140F90344DFE2BF74B13075;
- localparam [127:0] S_XYZ_1_128 = 128'h1A501D80B1F8648DE08C1AE673E13770;
- localparam [127:0] S_ABC_2_128 = 128'h2258423C6CDB0E1AA73F70CA41BC6633;
- localparam [127:0] S_XYZ_2_128 = 128'h5B278DEB75C055C8DA8E2993A791F3C2;
-
-
- //
- // Test Vectors (256-bit)
- //
- localparam [255:0] M_TEST_256 = 256'h0001FF0054455354544553545445535454455354544553545445535454455354;
- localparam [255:0] M_ABC_256 = 256'h0001FFFFFFFFFF00414243414243414243414243414243414243414243414243;
- localparam [255:0] M_XYZ_256 = 256'h0001FFFFFFFFFF0058595A58595A58595A58595A58595A58595A58595A58595A;
-
- localparam [255:0] N_1_256 = 256'h624341A8670845B4AA39CC2C08437E2568E11441CB5461CB49162EAC2E751FC5;
- localparam [255:0] N_2_256 = 256'h772F7C4A4D8C92CE59D8688897795F7208D3B1D3B5C7D83BF0E1A2A59D879A13;
- localparam [255:0] D_1_256 = 256'h41D555B401F3A4DFF9FC673249070F08247EF8A52A270F283FFAA7EA65B25F01;
- localparam [255:0] D_2_256 = 256'h1606E0A19AD3700E52EC7BE542995BDA26AA386DD677A74B7B2846AC44BCAD81;
-
- localparam [255:0] S_TEST_1_256 = 256'h07EFB60CF6E6F2350E8D2D5C5261F36CF0B2B71833386AC6E7958A8F39DAD331;
- localparam [255:0] S_TEST_2_256 = 256'h5C18F857BF6E4D6A013F554A680329BDC14C31FF38D0EEAD1DE02CFD85337A53;
- localparam [255:0] S_ABC_1_256 = 256'h2AA0A5D3B2AE1FFD23640714F652DD147B6C202905B4D273E837313FB392487C;
- localparam [255:0] S_XYZ_1_256 = 256'h27850A998B867CB67146EEFF15147668D7CF6B7BD5B048D9735D5767EB6D68CB;
- localparam [255:0] S_ABC_2_256 = 256'h56A0DA5F9987DF4E921A771CCC8A1D68F8DD7D9244A0DD37A4095D61F455489D;
- localparam [255:0] S_XYZ_2_256 = 256'h08A7AF13E058754278EE6582626A6675D09A08C0C898E218FCDF7FFA37C9876C;
-
-
- //
- // Locals
- //
- localparam [ 1: 0] BANK_MODULUS = 2'b00;
- localparam [ 1: 0] BANK_MESSAGE = 2'b01;
- localparam [ 1: 0] BANK_EXPONENT = 2'b10;
- localparam [ 1: 0] BANK_RESULT = 2'b11;
-
-
- //
- // Integers
- //
- integer addr;
-
-
- //
- // Inputs, Outputs
- //
- reg init;
- reg next;
- wire ready;
- wire valid;
-
-
- //
- // Bus
- //
- reg bus_cs;
- reg bus_we;
- reg [ 4: 0] bus_addr;
- reg [31: 0] bus_data_wr;
- wire [31: 0] bus_data_rd;
-
-
- //
- // Clock (100 MHz)
- //
- reg clk = 1'b0;
- always #5 clk = ~clk;
-
-
- //
- // UUT
- //
- modexpa7_top #
- (
- .MAX_MODULUS_WIDTH (MAX_MODULUS_WIDTH)
- )
- uut
- (
- .clk (clk),
-
- .init (init),
- .ready (ready),
-
- .next (next),
- .valid (valid),
-
- .modulus_width (modulus_width),
- .exponent_width (exponent_width),
-
- .fast_public_mode (use_public_mode),
-
- .bus_cs (bus_cs),
- .bus_we (bus_we),
- .bus_addr (bus_addr),
- .bus_data_wr (bus_data_wr),
- .bus_data_rd (bus_data_rd)
- );
-
-
- //
- // Script
- //
- initial begin
- //
- $display("Testbench started.");
- //
- init = 0;
- next = 0;
- //
- bus_cs = 0;
- bus_we = 0;
- bus_addr = 5'd0;
- bus_data_wr = 32'h00000000;
- //
- #200;
- //
- $display("Running in public (unsafe, faster) mode...");
- use_public_mode = 1;
- //
- run_tests_128();
- run_tests_256();
- //
- $display("Running in private (safe, slower) mode...");
- use_public_mode = 0;
- //
- run_tests_128();
- run_tests_256();
- //
- $display("All tests passed.");
- $display("Testbench finished.");
- //
- $finish;
- //
- end
-
-
- //
- // run_tests_128()
- //
- task run_tests_128;
- begin
- //
- $display("Testing 128-bit mode...");
- //
- $display("Setting modulus #1...");
- set_modulus_128(N_1_128);
- $display("Signing TEST message...");
- test_vector_128(M_TEST_128, D_1_128, S_TEST_1_128);
- //
- $display("Setting modulus #2...");
- set_modulus_128(N_2_128);
- $display("Signing TEST message...");
- test_vector_128(M_TEST_128, D_2_128, S_TEST_2_128);
- //
- $display("Setting modulus #1...");
- set_modulus_128(N_1_128);
- $display("Signing ABC message...");
- test_vector_128(M_ABC_128, D_1_128, S_ABC_1_128);
- $display("Signing XYZ message...");
- test_vector_128(M_XYZ_128, D_1_128, S_XYZ_1_128);
- //
- $display("Setting modulus #2...");
- set_modulus_128(N_2_128);
- $display("Signing ABC message...");
- test_vector_128(M_ABC_128, D_2_128, S_ABC_2_128);
- $display("Signing XYZ message...");
- test_vector_128(M_XYZ_128, D_2_128, S_XYZ_2_128);
- //
- end
- endtask
-
-
- //
- // run_tests_256()
- //
- task run_tests_256;
- begin
- //
- $display("Testing 256-bit mode...");
- //
- $display("Setting modulus #1...");
- set_modulus_256(N_1_256);
- $display("Signing TEST message...");
- test_vector_256(M_TEST_256, D_1_256, S_TEST_1_256);
- //
- $display("Setting modulus #2...");
- set_modulus_256(N_2_256);
- $display("Signing TEST message...");
- test_vector_256(M_TEST_256, D_2_256, S_TEST_2_256);
- //
- $display("Setting modulus #1...");
- set_modulus_256(N_1_256);
- $display("Signing ABC message...");
- test_vector_256(M_ABC_256, D_1_256, S_ABC_1_256);
- $display("Signing XYZ message...");
- test_vector_256(M_XYZ_256, D_1_256, S_XYZ_1_256);
- //
- $display("Setting modulus #2...");
- set_modulus_256(N_2_256);
- $display("Signing ABC message...");
- test_vector_256(M_ABC_256, D_2_256, S_ABC_2_256);
- $display("Signing XYZ message...");
- test_vector_256(M_XYZ_256, D_2_256, S_XYZ_2_256);
- //
- end
- endtask
-
-
-
- //
- // set_modulus_128()
- //
- task set_modulus_128;
- input [127:0] modulus;
- begin
- //
- modulus_width = 9'd128;
- //
- bank_write_128(BANK_MODULUS, modulus);
- #100;
- init = 1;
- wait_ready();
- init = 0;
- #100;
- //
- end
- endtask
-
-
- //
- // set_modulus_256()
- //
- task set_modulus_256;
- input [255:0] modulus;
- begin
- //
- modulus_width = 9'd256;
- //
- bank_write_256(BANK_MODULUS, modulus);
- #100;
- init = 1;
- wait_ready();
- init = 0;
- #100;
- //
- end
- endtask
-
-
- //
- // test_vector_128()
- //
- task test_vector_128;
- input [127:0] message;
- input [127:0] exponent;
- input [127:0] signature;
- reg [127:0] readback;
- begin
- //
- exponent_width = 9'd128;
- //
- bank_write_128(BANK_MESSAGE, message);
- #100;
- bank_write_128(BANK_EXPONENT, exponent);
- #100;
- //
- next = 1;
- wait_valid();
- next = 0;
- #100;
- //
- bank_read_128(BANK_RESULT, readback);
- //
- $display(" signature: %032x", signature);
- $display(" readback: %032x", readback);
- //
- if (readback == signature) $display("Got correct S = M ** E mod N [OK]");
- else begin
- $display("Got wrong S = M ** E mod N [ERROR]");
- $finish;
- end
- //
- end
- endtask
-
-
- //
- // test_vector_256()
- //
- task test_vector_256;
- input [255:0] message;
- input [255:0] exponent;
- input [255:0] signature;
- reg [255:0] readback;
- begin
- //
- exponent_width = 9'd256;
- //
- bank_write_256(BANK_MESSAGE, message);
- #100;
- bank_write_256(BANK_EXPONENT, exponent);
- #100;
- //
- next = 1;
- wait_valid();
- next = 0;
- #100;
- //
- bank_read_256(BANK_RESULT, readback);
- //
- $display(" signature: %064x", signature);
- $display(" readback: %064x", readback);
- //
- if (readback == signature) $display("Got correct S = M ** E mod N [OK]");
- else begin
- $display("Got wrong S = M ** E mod N [ERROR]");
- $finish;
- end
- //
- end
- endtask
-
-
- //
- // bus_write_reg()
- //
- task bus_write_reg;
- input [ 1: 0] bank;
- input [ 2: 0] offset;
- input [31: 0] data;
- begin
- //
- bus_cs = 1;
- bus_we = 1;
- bus_addr = {bank, offset};
- bus_data_wr = data;
- //
- #10;
- //
- bus_cs = 0;
- bus_we = 0;
- //
- #10;
- //
- end
- endtask
-
-
- //
- // bus_read_reg()
- //
- task bus_read_reg;
- input [ 1: 0] bank;
- input [ 2: 0] offset;
- output [31: 0] data;
- begin
- //
- bus_cs = 1;
- bus_we = 0;
- bus_addr = {bank, offset};
- //
- #10;
- //
- bus_cs = 0;
- bus_we = 0;
- data = bus_data_rd;
- //
- #10;
- //
- end
- endtask
-
-
- //
- // bank_write_128()
- //
- task bank_write_128;
- input [ 1:0] bank;
- input [127:0] value;
- reg [127:0] shreg;
- begin
- //
- shreg = value;
- //
- for (addr=0; addr<4; addr=addr+1) begin
- bus_write_reg(bank, addr[2:0], shreg[31:0]);
- shreg = {{32{1'b0}}, shreg[127:32]};
- end
- //
- end
- endtask
-
-
- //
- // bank_write_256()
- //
- task bank_write_256;
- input [ 1:0] bank;
- input [255:0] value;
- reg [255:0] shreg;
- begin
- //
- shreg = value;
- //
- for (addr=0; addr<8; addr=addr+1) begin
- bus_write_reg(bank, addr[2:0], shreg[31:0]);
- shreg = {{32{1'b0}}, shreg[255:32]};
- end
- //
- end
- endtask
-
-
- //
- // bank_read_128()
- //
- task bank_read_128;
- input [ 1:0] bank;
- output [127:0] value;
- reg [ 31:0] shreg;
- begin
- //
- for (addr=0; addr<4; addr=addr+1) begin
- bus_read_reg(bank, addr[2:0], shreg);
- value = {shreg, value[127:32]};
- end
- //
- end
- endtask
-
-
- //
- // bank_read_256()
- //
- task bank_read_256;
- input [ 1:0] bank;
- output [255:0] value;
- reg [ 31:0] shreg;
- begin
- //
- for (addr=0; addr<8; addr=addr+1) begin
- bus_read_reg(bank, addr[2:0], shreg);
- value = {shreg, value[255:32]};
- end
- //
- end
- endtask
-
-
- //
- // wait_ready()
- //
- task wait_ready;
- begin
- while (!ready) #10;
- end
- endtask
-
-
- //
- // wait_valid()
- //
- task wait_valid;
- begin
- while (!valid) #10;
- end
- endtask
-
-
-endmodule
-
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