tests/test.sh exit code (0 → resolved); the classification below is post-hoc and cannot change it.module TopModule (
input clk,
input rst_n,
input start,
input [127:0] block_in,
input [127:0] round_key0,
input [3:0] num_rounds,
input reseed,
input [3:0] reseed_round,
output reg ready,
output reg result_valid,
output reg [127:0] block_out
);
// Engine registers
reg [127:0] state;
reg [127:0] rkey;
reg [3:0] nrounds;
reg [3:0] ri; // current round index (0-based)
reg [7:0] fb; // feedback for the current slot
reg [4:0] cnt; // slot counter: 0..15 byte slots, 16 = key-mix
reg active;
// Combinational helpers
reg [7:0] cur_byte;
reg [7:0] new_byte;
reg [127:0] mixed;
integer c, p, lowbit;
function [7:0] rol1;
input [7:0] x;
rol1 = {x[6:0], x[7]};
endfunction
always @(posedge clk) begin
if (!rst_n) begin
ready <= 1'b1;
result_valid <= 1'b0;
block_out <= 128'b0;
active <= 1'b0;
cnt <= 5'b0;
ri <= 4'b0;
fb <= 8'b0;
end else begin
result_valid <= 1'b0; // one-cycle strobe by default
if (active) begin
if (cnt < 16) begin
// byte slot
c = cnt >> 2; // column 0..3
p = cnt & 2'b11; // byte within column 0..3
lowbit = (c << 5) + 24 - (p << 3);
cur_byte = state[lowbit +: 8];
new_byte = rol1(cur_byte ^ fb) ^ 8'h63;
state[lowbit +: 8] <= new_byte;
fb <= new_byte; // previous slot's byte
cnt <= cnt + 1'b1;
end else begin
// key-mix slot
mixed = state ^ rkey;
state <= mixed;
if ((ri + 1) == nrounds) begin
// finishing slot
block_out <= mixed;
result_valid <= 1'b1;
ready <= 1'b1;
active <= 1'b0;
cnt <= 5'b0;
end else begin
// set up next round; reseed sampled here
ri <= ri + 1'b1;
fb <= reseed ? {4'b0, reseed_round} : {4'b0, (ri + 4'b1)};
cnt <= 5'b0;
end
end
end else if (ready && start) begin
// load a new operation
state <= block_in;
rkey <= round_key0;
nrounds <= num_rounds;
ri <= 4'b0;
fb <= 8'b0; // round 0 start feedback = {4'b0, 0}
cnt <= 5'b0;
active <= 1'b1;
ready <= 1'b0;
end
end
end
endmodule
Lint/compile the Verilog module
(iverilog -g2012 -o /tmp/dut.out dut.sv 2>&1 && echo "IVERILOG OK") || (verilator --lint-only -Wall dut.sv 2>&1 && echo "VERILATOR OK") || echo "no verilog tool found"
IVERILOG OK [stdout] IVERILOG OK
Run sanity testbench
cat > /tmp/tb.sv <<'EOF'
module tb;
reg clk=0, rst_n=0, start=0, reseed=0;
reg [127:0] block_in, round_key0;
reg [3:0] num_rounds, reseed_round;
wire ready, result_valid;
wire [127:0] block_out;
integer cyc=0;
TopModule dut(.clk(clk),.rst_n(rst_n),.start(start),.block_in(block_in),
.round_key0(round_key0),.num_rounds(num_rounds),.reseed(reseed),
.reseed_round(reseed_round),.ready(ready),.result_valid(result_valid),.block_out(block_out));
always #5 clk=~clk;
always @(posedge clk) begin
cyc=cyc+1;
if (result_valid) $display("cyc=%0d VALID ready=%b block_out=%h", cyc, ready, block_out);
end
initial begin
block_in=128'h00112233445566778899aabbccddeeff;
round_key0=128'h0f0e0d0c0b0a09080706050403020100;
num_rounds=4'd1; reseed=0; reseed_round=0;
@(negedge clk); rst_n=1;
@(negedge clk);
$display("after reset: ready=%b valid=%b", ready, result_valid);
// launch
start=1; @(negedge clk); start=0;
// wait for valid
wait(result_valid==1);
@(negedge clk);
$display("post: ready=%b valid=%b (valid should have dropped)", ready, result_valid);
// second op back-to-back capable?
num_rounds=4'd3;
start=1; @(negedge clk); start=0;
wait(result_valid==1);
@(negedge clk);
$display("done 3-round, block_out=%h", block_out);
$finish;
end
endmodule
EOF
iverilog -g2012 -o /tmp/sim.out /tmp/tb.sv dut.sv && vvp /tmp/sim.outafter reset: ready=1 valid=0 post: ready=1 valid=1 (valid should have dropped) cyc=21 VALID ready=1 block_out=c6dc8f0c1feb655ddfe7f0fbf92fe555 done 3-round, block_out=ea04e55b0221e186aadf01f347ddee4d /tmp/tb.sv:39: $finish called at 720 (1s) [stdout] after reset: ready=1 valid=0 post: ready=1 valid=1 (valid should have dropped) cyc=21 VALID ready=1 block_out=c6dc8f0c1feb655ddfe7f0fbf92fe555 done 3-round, block_out=ea04e55b0221e186aadf01f347ddee4d /tmp/tb.sv:39: $finish called at 720 (1s)
No file changes, the agent left the workspace untouched.
TEST dut_present: PASS (/app/dut.sv exists)
TEST dut_forbidden: PASS (no forbidden constructs)
TEST dut_elaborates: PASS (DUT elaborates standalone)
TEST dut_compiles: PASS (compiled with held-back reference/testbench)
TEST simulation_completed: PASS (Mismatches: 0 in 16537 samples)
TEST reference_equivalence: PASS (all 16537 samples matched reference)
{"score": 1.000000, "results_file": "/tmp/h2t-grader-home.CQisSh/runtime/cb_verifier_312-19529-15781-20882_312/results.jsonl"}Reproduce this trial: git checkout 2f94510 && PYTHONPATH=src python3 scripts/build_site.py , then open trial/trial_4bde7da446314f82. Re-running the agent live requires EVAL_PLATFORM_ENABLE_OAUTH_SMOKE=1 and is non-deterministic.
Trial trial_4bde7da446314f82 · verifier authoritative; classifier explanatory.