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] key_reg;
reg [3:0] nr_reg;
reg [3:0] ridx; // index of the round currently being computed
reg [7:0] sf; // start feedback for the round currently being computed
reg running;
// Combinational: apply the sixteen byte slots of one round.
function [127:0] byte_slots;
input [127:0] s;
input [7:0] startfb;
reg [127:0] cur;
reg [7:0] fb;
reg [7:0] orig, t, nb;
integer slot, col, bidx, lowbit;
begin
cur = s;
fb = startfb;
for (slot = 0; slot < 16; slot = slot + 1) begin
col = slot / 4;
bidx = slot % 4;
lowbit = 32*col + (3 - bidx)*8;
orig = cur[lowbit +: 8];
t = orig ^ fb; // byte xor feedback
nb = {t[6:0], t[7]} ^ 8'h63; // rol1 then xor 0x63
cur[lowbit +: 8] = nb;
fb = nb; // next slot feeds on this slot's byte
end
byte_slots = cur;
end
endfunction
// Full round = byte slots, then key-mix slot (xor round_key0).
wire [127:0] round_out = byte_slots(state, sf) ^ key_reg;
always @(posedge clk) begin
if (!rst_n) begin
ready <= 1'b1;
result_valid <= 1'b0;
running <= 1'b0;
block_out <= 128'b0;
end else begin
result_valid <= 1'b0;
if (ready && start) begin
// Load a new operation; state seeded by block_in.
state <= block_in;
key_reg <= round_key0;
nr_reg <= num_rounds;
ridx <= 4'd0;
sf <= 8'd0; // round 0 start feedback = {4'b0, round_index=0}
ready <= 1'b0;
running <= 1'b1;
end else if (running) begin
if ((ridx + 4'd1) == nr_reg) begin
// Finishing key-mix slot of the last round.
block_out <= round_out;
result_valid <= 1'b1;
ready <= 1'b1;
running <= 1'b0;
end else begin
// Advance to next round; fix its start feedback via reseed here.
state <= round_out;
ridx <= ridx + 4'd1;
sf <= reseed ? {4'd0, reseed_round}
: {4'd0, (ridx + 4'd1)};
end
end
end
end
endmodule
Compile the Verilog module
iverilog -g2012 -o /tmp/dut.out dut.sv 2>&1 && echo "COMPILE OK" || echo "iverilog not available or error"
COMPILE OK [stdout] COMPILE OK
Run simulation testbench
cat > /tmp/tb.sv <<'EOF'
module tb;
reg clk=0, rst_n, start, reseed;
reg [127:0] block_in, round_key0;
reg [3:0] num_rounds, reseed_round;
wire ready, result_valid;
wire [127:0] block_out;
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;
integer i;
initial begin
rst_n=0; start=0; reseed=0; reseed_round=0; block_in=0; round_key0=0; num_rounds=1;
@(posedge clk); #1 rst_n=1;
// Test A
block_in=128'h0123456789abcdef_fedcba9876543210;
round_key0=128'hdeadbeef_cafebabe_00112233_44556677;
num_rounds=4; reseed=1; reseed_round=4'd7;
@(negedge clk); start=1; @(negedge clk); start=0;
wait(result_valid); #1;
$display("A block_out=%h", block_out);
@(posedge clk);
// Test B single round no reseed, zeros
@(negedge clk);
block_in=0; round_key0=0; num_rounds=1; reseed=0;
start=1; @(negedge clk); start=0;
wait(result_valid); #1;
$display("B block_out=%h", block_out);
#20 $finish;
end
endmodule
EOF
iverilog -g2012 -o /tmp/sim /app/dut.sv /tmp/tb.sv && vvp /tmp/simA block_out=8bbbe308a3b0f2d47a872434819275a9 B block_out=0569b10063a528330569b10063a52833 /tmp/tb.sv:29: $finish called at 106 (1s) [stdout] A block_out=8bbbe308a3b0f2d47a872434819275a9 B block_out=0569b10063a528330569b10063a52833 /tmp/tb.sv:29: $finish called at 106 (1s)
Python reference model
cat > /tmp/model.py <<'EOF'
def rol1(x): return ((x<<1)|(x>>7))&0xff
def byte_slots(state, sf):
cur=[(state>>(8*i))&0xff for i in range(16)] # cur[i] = byte at bits[8i+7:8i]
fb=sf
for slot in range(16):
col=slot//4; bidx=slot%4
lowbit=32*col+(3-bidx)*8
idx=lowbit//8
orig=cur[idx]
t=orig^fb
nb=rol1(t)^0x63
cur[idx]=nb
fb=nb
s=0
for i in range(16): s|=cur[i]<<(8*i)
return s
def run(block_in,key,num_rounds,reseed,reseed_round):
state=block_in
for r in range(num_rounds):
if r==0: sf=0
else:
sf = reseed_round if reseed else r
state=byte_slots(state,sf)^key
return state
A=run(0x0123456789abcdeffedcba9876543210,0xdeadbeefcafebabe0011223344556677,4,1,7)
B=run(0,0,1,0,0)
print("A %032x"%A)
print("B %032x"%B)
EOF
python3 /tmp/model.pyA 8bbbe308a3b0f2d47a872434819275a9 B 0569b10063a528330569b10063a52833 [stdout] A 8bbbe308a3b0f2d47a872434819275a9 B 0569b10063a528330569b10063a52833
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: 15924 in 16537 samples)
TEST reference_equivalence: FAIL (15924 mismatches in 16537 samples)
{"score": 0.000000, "results_file": "/tmp/h2t-grader-home.Xxw7bk/runtime/cb_verifier_312-7256-13782-5412_312/results.jsonl"}Reproduce this trial: git checkout 2f94510 && PYTHONPATH=src python3 scripts/build_site.py , then open trial/trial_10944e8c3b2b4b47. Re-running the agent live requires EVAL_PLATFORM_ENABLE_OAUTH_SMOKE=1 and is non-deterministic.
Trial trial_10944e8c3b2b4b47 · verifier authoritative; classifier explanatory.