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
);
// Sequencing state
reg [127:0] state; // engine state
reg [127:0] rkey; // latched round_key0
reg [3:0] nrounds; // latched num_rounds (1..15)
reg [3:0] round_index; // completed rounds / current round index
reg [4:0] slot; // 0..15 byte slots, 16 = key-mix slot
reg [7:0] sfb; // current round's start feedback
reg [7:0] prev_byte; // last byte written (feedback for next slot)
reg busy;
// Combinational scratch
integer col, bsel, low;
reg [7:0] cur_byte, fb, t, new_byte;
reg [127:0] mixed;
reg [7:0] next_sfb;
always @(posedge clk) begin
if (!rst_n) begin
// Synchronous, active-low reset: clear outputs
ready <= 1'b1;
result_valid <= 1'b0;
busy <= 1'b0;
end else begin
result_valid <= 1'b0; // default: single-cycle pulse
if (!busy) begin
ready <= 1'b1;
if (ready && start) begin
// Load a new operation
state <= block_in;
rkey <= round_key0;
nrounds <= num_rounds;
round_index <= 4'd0;
slot <= 5'd0;
sfb <= 8'd0; // round 0 start feedback = {4'b0, round_index=0}
busy <= 1'b1;
ready <= 1'b0;
end
end else begin
if (slot <= 5'd15) begin
// Byte slot
col = slot >> 2; // column 0..3
bsel = slot[1:0]; // 0 = [31:24] .. 3 = [7:0]
low = (col << 5) + ((3 - bsel) << 3);
cur_byte = state[low +: 8];
fb = (slot == 5'd0) ? sfb : prev_byte;
t = cur_byte ^ fb;
new_byte = {t[6:0], t[7]} ^ 8'h63; // rol1 then xor 0x63
state[low +: 8] <= new_byte;
prev_byte <= new_byte;
slot <= slot + 5'd1;
end else begin
// Key-mix slot
mixed = state ^ rkey;
state <= mixed;
if (round_index == nrounds - 4'd1) begin
// Finishing key-mix slot
block_out <= mixed;
result_valid <= 1'b1;
ready <= 1'b1;
busy <= 1'b0;
end else begin
// Set up next round; reseed sampled here only
round_index <= round_index + 4'd1;
slot <= 5'd0;
next_sfb = reseed ? {4'b0, reseed_round}
: {4'b0, (round_index + 4'd1)};
sfb <= next_sfb;
end
end
end
end
end
endmodule
Compile-check the Verilog
(iverilog -g2012 -o /tmp/dut.out dut.sv 2>&1 && echo "COMPILE OK") || (which iverilog >/dev/null 2>&1 || echo "iverilog not installed")
COMPILE OK [stdout] COMPILE OK
Generate reference vectors
cat > /tmp/ref.py << 'EOF'
def rol1(b): return ((b<<1)|(b>>7))&0xFF
def op(block, key, nrounds, reseed=0, reseed_round=0):
state=[ (block>>(8*i))&0xFF for i in range(16)] # byte i = state bits [8i+7:8i]
def getb(pos): return state[pos//8] # pos is low bit index -> byte index pos/8
ri=0
sfb=0 # round 0
for r in range(nrounds):
# 16 byte slots
prev=0
for slot in range(16):
col=slot//4; bsel=slot%4
low=col*32 + (3-bsel)*8
bidx=low//8
fb = sfb if slot==0 else prev
t = state[bidx]^fb
nb = rol1(t)^0x63
state[bidx]=nb
prev=nb
# key-mix
for i in range(16):
state[i]^= (key>>(8*i))&0xFF
if r==nrounds-1:
break
ri+=1
sfb = reseed_round if reseed else ri
return sum(state[i]<<(8*i) for i in range(16))
# test vectors
import random
random.seed(1)
vecs=[]
for _ in range(6):
b=random.getrandbits(128); k=random.getrandbits(128); n=random.randint(1,15)
rs=random.randint(0,1); rr=random.randint(0,15)
vecs.append((b,k,n,rs,rr,op(b,k,n,rs,rr)))
with open('/tmp/vecs.txt','w') as f:
for b,k,n,rs,rr,o in vecs:
f.write(f"{b:032x} {k:032x} {n} {rs} {rr} {o:032x}\n")
print(f"n={n} rs={rs} rr={rr} -> {o:032x}")
EOF
python3 /tmp/ref.pyn=8 rs=1 rr=15 -> 0b6f103738c3f2ab4cde163e2d9a1bc6 n=14 rs=1 rr=13 -> 1ea8d304cfebc791cff3a17a023cc39c n=13 rs=0 rr=3 -> 00c4670cc08acb3cf94d8f8ee30523b7 n=15 rs=1 rr=6 -> 4b92139039e4f40acac3e120c477479c n=8 rs=0 rr=11 -> f5bb95d2f3ad470574619d7ae69ed731 n=1 rs=1 rr=3 -> b5678a89c84d97f59cf1a23f60d5293f [stdout] n=8 rs=1 rr=15 -> 0b6f103738c3f2ab4cde163e2d9a1bc6 n=14 rs=1 rr=13 -> 1ea8d304cfebc791cff3a17a023cc39c n=13 rs=0 rr=3 -> 00c4670cc08acb3cf94d8f8ee30523b7 n=15 rs=1 rr=6 -> 4b92139039e4f40acac3e120c477479c n=8 rs=0 rr=11 -> f5bb95d2f3ad470574619d7ae69ed731 n=1 rs=1 rr=3 -> b5678a89c84d97f59cf1a23f60d5293f
Run RTL against reference vectors
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 fd, code, n, rs, rr, errors;
reg [127:0] b,k,exp;
task run_one;
begin
@(negedge clk);
block_in=b; round_key0=k; num_rounds=n[3:0]; reseed=rs[0]; reseed_round=rr[3:0];
start=1;
@(negedge clk); start=0;
// reseed must be held through operation for the key-mix sampling; hold it
wait(result_valid==1);
if (block_out!==exp) begin errors=errors+1; $display("MISMATCH exp=%032x got=%032x",exp,block_out); end
else $display("OK %032x", block_out);
@(negedge clk);
end
endtask
initial begin
errors=0; start=0; reseed=0;
rst_n=0; @(negedge clk); @(negedge clk); rst_n=1;
fd=$fopen("/tmp/vecs.txt","r");
while (!$feof(fd)) begin
code=$fscanf(fd,"%h %h %d %d %d %h\n",b,k,n,rs,rr,exp);
if (code==6) run_one;
end
if (errors==0) $display("ALL PASS"); else $display("%0d ERRORS",errors);
$finish;
end
endmodule
EOF
iverilog -g2012 -o /tmp/sim /app/dut.sv /tmp/tb.sv && vvp /tmp/simOK 0b6f103738c3f2ab4cde163e2d9a1bc6 OK 1ea8d304cfebc791cff3a17a023cc39c OK 00c4670cc08acb3cf94d8f8ee30523b7 OK 4b92139039e4f40acac3e120c477479c OK f5bb95d2f3ad470574619d7ae69ed731 OK b5678a89c84d97f59cf1a23f60d5293f ALL PASS /tmp/tb.sv:37: $finish called at 10170 (1s) [stdout] OK 0b6f103738c3f2ab4cde163e2d9a1bc6 OK 1ea8d304cfebc791cff3a17a023cc39c OK 00c4670cc08acb3cf94d8f8ee30523b7 OK 4b92139039e4f40acac3e120c477479c OK f5bb95d2f3ad470574619d7ae69ed731 OK b5678a89c84d97f59cf1a23f60d5293f ALL PASS /tmp/tb.sv:37: $finish called at 10170 (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: 167 in 16537 samples)
TEST reference_equivalence: FAIL (167 mismatches in 16537 samples)
{"score": 0.000000, "results_file": "/tmp/h2t-grader-home.y2lQAC/runtime/cb_verifier_316-26608-23984-2312_316/results.jsonl"}Reproduce this trial: git checkout 2f94510 && PYTHONPATH=src python3 scripts/build_site.py , then open trial/trial_08ac2372e8bf4764. Re-running the agent live requires EVAL_PLATFORM_ENABLE_OAUTH_SMOKE=1 and is non-deterministic.
Trial trial_08ac2372e8bf4764 · verifier authoritative; classifier explanatory.