aboutsummaryrefslogtreecommitdiff
path: root/src/tb
diff options
context:
space:
mode:
authorJoachim StroĢˆmbergson <joachim@secworks.se>2015-06-26 09:34:46 +0200
committerJoachim StroĢˆmbergson <joachim@secworks.se>2015-06-26 09:34:46 +0200
commit5b00f7cacdc557493daa3acf857ab1c6c15a9fc3 (patch)
tree487aabc064cdb34e014d03a3876479ea0926d95d /src/tb
parent8e73cbff5bdfd994cdc7eee7ca3fcf953e63f395 (diff)
Changed modexp core to use explicit exponent length to allow removal of padding of exponent and improving performance. Updated testbenches to match the changed lengths inside the device under test.
Diffstat (limited to 'src/tb')
-rw-r--r--src/tb/tb_modexp.v61
-rw-r--r--src/tb/tb_modexp_autogenerated.v4
2 files changed, 58 insertions, 7 deletions
diff --git a/src/tb/tb_modexp.v b/src/tb/tb_modexp.v
index fe22662..363b4ed 100644
--- a/src/tb/tb_modexp.v
+++ b/src/tb/tb_modexp.v
@@ -256,8 +256,8 @@ module tb_modexp();
dut.core_inst.ready_reg, dut.start_reg, dut.start_new);
$display("residue_valid = 0x%01x", dut.core_inst.residue_valid_reg);
$display("loop_counter_reg = 0x%08x", dut.core_inst.loop_counter_reg);
- $display("exponent_length_reg = 0x%02x, modulus_length_reg = 0x%02x length_m1 = 0x%02x",
- dut.exponent_length_reg, dut.modulus_length_reg, dut.core_inst.length_m1);
+ $display("exponent_length_reg = 0x%02x exponent_length_m1 = 0x%02x modulus_length_reg = 0x%02x modulus_length_m1 = 0x%02x",
+ dut.exponent_length_reg, dut.core_inst.exponent_length_m1, dut.modulus_length_reg, dut.core_inst.modulus_length_m1);
$display("ctrl_reg = 0x%04x", dut.core_inst.modexp_ctrl_reg);
$display("");
end
@@ -885,6 +885,56 @@ module tb_modexp();
//----------------------------------------------------------------
+ // e65537_64bit_modulus_elength()
+ //----------------------------------------------------------------
+ task e65537_64bit_modulus_elength();
+ reg [31 : 0] read_data;
+ begin
+ success = 32'h1;
+ tc_ctr = tc_ctr + 1;
+ $display("Test with e = 65537 and 64 bit modulus, explicit exponent length.");
+
+ write_word({GENERAL_PREFIX, ADDR_EXPONENT_PTR_RST}, 32'h00000000);
+ write_word({GENERAL_PREFIX, ADDR_EXPONENT_DATA}, 32'h00010001);
+
+ write_word({GENERAL_PREFIX, ADDR_MODULUS_PTR_RST}, 32'h00000000);
+ write_word({GENERAL_PREFIX, ADDR_MODULUS_DATA}, 32'h00000000);
+ write_word({GENERAL_PREFIX, ADDR_MODULUS_DATA}, 32'hf077656f);
+ write_word({GENERAL_PREFIX, ADDR_MODULUS_DATA}, 32'h3bf9e69b);
+
+ write_word({GENERAL_PREFIX, ADDR_MESSAGE_PTR_RST}, 32'h00000000);
+ write_word({GENERAL_PREFIX, ADDR_MESSAGE_DATA}, 32'h00000000);
+ write_word({GENERAL_PREFIX, ADDR_MESSAGE_DATA}, 32'hb6684dc3);
+ write_word({GENERAL_PREFIX, ADDR_MESSAGE_DATA}, 32'h79a5824b);
+
+ write_word({GENERAL_PREFIX, ADDR_EXPONENT_LENGTH}, 32'h00000001);
+ write_word({GENERAL_PREFIX, ADDR_MODULUS_LENGTH}, 32'h00000003);
+
+ start_test_cycle_ctr();
+
+ // Start processing and wait for ready.
+ write_word({GENERAL_PREFIX, ADDR_CTRL}, 32'h00000001);
+ wait_ready();
+
+ stop_test_cycle_ctr();
+
+ write_word({GENERAL_PREFIX, ADDR_RESULT_PTR_RST}, 32'h00000000);
+ read_word({GENERAL_PREFIX, ADDR_RESULT_DATA}); read_data = tb_read_data; success = success & assertEquals(32'h00000000, read_data);
+ read_word({GENERAL_PREFIX, ADDR_RESULT_DATA}); read_data = tb_read_data; success = success & assertEquals(32'h132d8e17, read_data);
+ read_word({GENERAL_PREFIX, ADDR_RESULT_DATA}); read_data = tb_read_data; success = success & assertEquals(32'hdd4d85a4, read_data);
+
+ if (success !== 1)
+ begin
+ $display("*** ERROR: e65537_64bit_modulus with explicit elength was NOT successful.");
+ error_ctr = error_ctr + 1;
+ end
+ else
+ $display("*** e65537_64bit_modulus success.");
+ end
+ endtask // e65537_64bit_modulus_elength
+
+
+ //----------------------------------------------------------------
// e65537_128bit_modulus()
//----------------------------------------------------------------
task e65537_128bit_modulus();
@@ -1398,10 +1448,11 @@ module tb_modexp();
// tc1();
// tc2();
// tc3();
- autogenerated_BASIC_33bit();
- autogenerated_BASIC_128bit();
+// autogenerated_BASIC_33bit();
+// autogenerated_BASIC_128bit();
e65537_64bit_modulus();
-// e65537_128bit_modulus();
+ e65537_64bit_modulus_elength();
+ // e65537_128bit_modulus();
// e65537_256bit_modulus();
// rob_dec_1024();
diff --git a/src/tb/tb_modexp_autogenerated.v b/src/tb/tb_modexp_autogenerated.v
index 1eb80d5..0bb9432 100644
--- a/src/tb/tb_modexp_autogenerated.v
+++ b/src/tb/tb_modexp_autogenerated.v
@@ -174,8 +174,8 @@ module tb_modexp_autogenerated();
dut.core_inst.ready_reg, dut.start_reg, dut.start_new);
$display("residue_valid = 0x%01x", dut.core_inst.residue_valid_reg);
$display("loop_counter_reg = 0x%08x", dut.core_inst.loop_counter_reg);
- $display("exponent_length_reg = 0x%02x, modulus_length_reg = 0x%02x length_m1 = 0x%02x",
- dut.exponent_length_reg, dut.modulus_length_reg, dut.core_inst.length_m1);
+ $display("exponent_length_reg = 0x%02x, modulus_length_reg = 0x%02x modulus_length_m1 = 0x%02x",
+ dut.exponent_length_reg, dut.modulus_length_reg, dut.core_inst.modulus_length_m1);
$display("ctrl_reg = 0x%04x", dut.core_inst.modexp_ctrl_reg);
$display("");
end