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
);
// Internal state
reg [127:0] state;
reg [127:0] round_key_reg;
reg [3:0] num_rounds_reg;
reg [3:0] round_index;
reg [4:0] slot_counter; // 0..15 byte slots, 16 = key-mix slot
reg [7:0] start_feedback;
reg busy;
// Combinational temporaries
reg [6:0] cur_lsb;
reg [6:0] prev_lsb;
reg [7:0] cur_byte;
reg [7:0] fb;
reg [7:0] xred;
reg [7:0] new_byte;
reg [127:0] mixed;
// Map byte-slot index (0..15) to the LSB bit position of its byte.
// Column c = state[32*c+31:32*c]; within a column [31:24] first .. [7:0] last.
function [6:0] lsb_of;
input [3:0] i;
reg [1:0] c;
reg [1:0] p;
begin
c = i[3:2];
p = i[1:0];
lsb_of = {c, 5'b00000} + {(2'd3 - p), 3'b000};
end
endfunction
always @(posedge clk) begin
if (!rst_n) begin
ready <= 1'b1;
result_valid <= 1'b0;
block_out <= 128'b0;
busy <= 1'b0;
state <= 128'b0;
round_key_reg <= 128'b0;
num_rounds_reg <= 4'b0;
round_index <= 4'b0;
slot_counter <= 5'b0;
start_feedback <= 8'b0;
end else begin
result_valid <= 1'b0; // default: single-cycle pulse
if (!busy) begin
ready <= 1'b1;
if (start) begin
// Load / seed a new operation
state <= block_in;
round_key_reg <= round_key0;
num_rounds_reg <= num_rounds;
round_index <= 4'b0;
slot_counter <= 5'b0;
start_feedback <= 8'b0; // {4'b0, round_index=0}
busy <= 1'b1;
ready <= 1'b0;
end
end else begin
if (slot_counter <= 5'd15) begin
// Byte slot
cur_lsb = lsb_of(slot_counter[3:0]);
cur_byte = state[cur_lsb +: 8];
if (slot_counter == 5'd0) begin
fb = start_feedback;
end else begin
prev_lsb = lsb_of(slot_counter[3:0] - 4'd1);
fb = state[prev_lsb +: 8];
end
xred = cur_byte ^ fb;
new_byte = {xred[6:0], xred[7]} ^ 8'h63; // rol1 then xor 0x63
state[cur_lsb +: 8] <= new_byte;
slot_counter <= slot_counter + 5'd1;
ready <= 1'b0;
end else begin
// Key-mix slot
mixed = state ^ round_key_reg;
if (round_index + 4'd1 == num_rounds_reg) begin
// Finishing slot
block_out <= mixed;
result_valid <= 1'b1;
ready <= 1'b1;
busy <= 1'b0;
slot_counter <= 5'b0;
end else begin
// Advance to next round
state <= mixed;
round_index <= round_index + 4'd1;
slot_counter <= 5'b0;
start_feedback <= reseed ? {4'b0, reseed_round}
: {4'b0, (round_index + 4'd1)};
ready <= 1'b0;
end
end
end
end
end
endmodule
Compile-check the Verilog
(iverilog -g2012 -o /tmp/dut_tb dut.sv 2>&1 && echo "COMPILE_OK") || echo "iverilog not available or error"
COMPILE_OK [stdout] COMPILE_OK
Run self-checking 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;
// reference model
function [6:0] lsb_of(input [3:0] i);
reg [1:0] c,p; begin c=i[3:2]; p=i[1:0]; lsb_of={c,5'b0}+{(2'd3-p),3'b0}; end
endfunction
function [127:0] refmodel(input [127:0] bin, input [127:0] rk,
input [3:0] nr, input rs, input [3:0] rr);
reg [127:0] s; integer r,i; reg [3:0] ri; reg [7:0] sf,fb,cb,x,nb;
reg [6:0] cl,pl;
begin
s=bin; ri=0;
for(r=0;r<nr;r=r+1) begin
if(r==0) sf={4'b0,4'd0};
else sf = rs ? {4'b0,rr} : {4'b0,ri[3:0]}; // ri is index of this round
for(i=0;i<16;i=i+1) begin
cl=lsb_of(i[3:0]); cb=s[cl+:8];
if(i==0) fb=sf; else begin pl=lsb_of(i[3:0]-1); fb=s[pl+:8]; end
x=cb^fb; nb={x[6:0],x[7]}^8'h63; s[cl+:8]=nb;
end
s=s^rk;
ri=ri+1;
end
refmodel=s;
end
endfunction
reg [127:0] expv;
integer cyc;
initial begin
rst_n=0; start=0; reseed=0; block_in=0; round_key0=0; num_rounds=1; reseed_round=0;
@(posedge clk); #1; // reset applied
if(ready!==1'b1||result_valid!==1'b0) $display("RESET FAIL ready=%b rv=%b",ready,result_valid);
rst_n=1;
// Test 1: num_rounds=3, no reseed
@(negedge clk);
block_in=128'hdeadbeef_00112233_44556677_8899aabb;
round_key0=128'h0f1e2d3c_4b5a6978_8796a5b4_c3d2e1f0;
num_rounds=3; reseed=0; reseed_round=0; start=1;
@(posedge clk); #1; start=0;
expv=refmodel(128'hdeadbeef_00112233_44556677_8899aabb,
128'h0f1e2d3c_4b5a6978_8796a5b4_c3d2e1f0,3,0,0);
cyc=0;
while(result_valid!==1'b1 && cyc<200) begin @(posedge clk); #1; cyc=cyc+1; end
if(result_valid===1'b1) begin
if(block_out===expv) $display("TEST1 PASS out=%h cycles=%0d",block_out,cyc);
else $display("TEST1 FAIL got=%h exp=%h",block_out,expv);
if(ready!==1'b1) $display("TEST1 ready-at-finish FAIL");
end else $display("TEST1 TIMEOUT");
// valid should deassert next cycle
@(posedge clk); #1;
if(result_valid!==1'b0) $display("TEST1 valid not pulse");
// Test 2: num_rounds=5 with reseed on round transitions
@(negedge clk);
block_in=128'h01234567_89abcdef_fedcba98_76543210;
round_key0=128'haaaaaaaa_55555555_ffff0000_0000ffff;
num_rounds=5; reseed=1; reseed_round=4'd7; start=1;
@(posedge clk); #1; start=0;
// reference: reseed high sampled at each key-mix -> sf={0,7} for rounds>=1
// emulate refmodel with rs=1,rr=7
expv=refmodel(128'h01234567_89abcdef_fedcba98_76543210,
128'haaaaaaaa_55555555_ffff0000_0000ffff,5,1,7);
cyc=0;
while(result_valid!==1'b1 && cyc<300) begin @(posedge clk); #1; cyc=cyc+1; end
if(result_valid===1'b1) begin
if(block_out===expv) $display("TEST2 PASS out=%h cycles=%0d",block_out,cyc);
else $display("TEST2 FAIL got=%h exp=%h",block_out,expv);
end else $display("TEST2 TIMEOUT");
$finish;
end
endmodule
EOF
iverilog -g2012 -o /tmp/sim /app/dut.sv /tmp/tb.sv && vvp /tmp/simTEST1 PASS out=cfeb25bb27200513c67a5f49278a63fd cycles=51 TEST2 PASS out=5fe135adcbe2e646af66a3b391cf250d cycles=85 /tmp/tb.sv:82: $finish called at 1396 (1s) [stdout] TEST1 PASS out=cfeb25bb27200513c67a5f49278a63fd cycles=51 TEST2 PASS out=5fe135adcbe2e646af66a3b391cf250d cycles=85 /tmp/tb.sv:82: $finish called at 1396 (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.9emVPI/runtime/cb_verifier_310-28275-541-25922_310/results.jsonl"}Reproduce this trial: git checkout 2f94510 && PYTHONPATH=src python3 scripts/build_site.py , then open trial/trial_c424af11732b41dc. Re-running the agent live requires EVAL_PLATFORM_ENABLE_OAUTH_SMOKE=1 and is non-deterministic.
Trial trial_c424af11732b41dc · verifier authoritative; classifier explanatory.