98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222 | @pytest.mark.repricing
@pytest.mark.parametrize(
"precompile_address,calldata",
[
pytest.param(
p256verify_spec.Spec.P256VERIFY,
concatenate_parameters(
[
p256verify_spec.Spec.H0,
p256verify_spec.Spec.R0,
p256verify_spec.Spec.S0,
p256verify_spec.Spec.X0,
p256verify_spec.Spec.Y0,
]
),
id="p256verify",
),
],
)
def test_p256verify_uncachable(
benchmark_test: BenchmarkTestFiller,
pre: Alloc,
fork: Fork,
gas_benchmark_value: int,
tx_gas_limit: int,
precompile_address: Address,
calldata: bytes,
) -> None:
"""Benchmark P256VERIFY with unique input per call."""
if precompile_address not in fork.precompiles():
pytest.skip("Precompile not enabled")
gsc = fork.gas_costs()
intrinsic_gas_calculator = fork.transaction_intrinsic_cost_calculator()
precompile_cost = gsc.PRECOMPILE_P256VERIFY
# h: data[0:32] 32 bytes
# r: data[32:64] 32 bytes
# s: data[64:96] 32 bytes
# qx: data[96:128] 32 bytes
# qy: data[128:160] 32 bytes
attack_block = Op.MSTORE(
0,
Op.ADD(
Op.MLOAD(0),
Op.STATICCALL(
gas=Op.GAS,
address=precompile_address,
args_size=Op.CALLDATASIZE,
ret_offset=Op.CALLDATASIZE,
ret_size=0x20,
# gas accounting
address_warm=True,
inner_call_cost=precompile_cost,
),
),
# gas accounting
old_memory_size=160,
new_memory_size=160,
)
setup = Op.CALLDATACOPY(
0,
0,
Op.CALLDATASIZE,
# gas accounting
data_size=160,
old_memory_size=0,
new_memory_size=160,
)
setup_cost = setup.gas_cost(fork)
loop = WhileGas(
body=attack_block,
fork=fork,
extra_gas=precompile_cost,
)
code = setup + loop
attack_contract_address = pre.deploy_contract(code=code)
iteration_cost = loop.gas_cost(fork)
txs: list[Transaction] = []
remaining_gas = gas_benchmark_value
seed = 0
expected_opcode_count = 0
while remaining_gas > 0:
per_tx_gas = min(tx_gas_limit, remaining_gas)
h = int.from_bytes(calldata[:32], "big") + seed
tx_calldata = Bytes(
h.to_bytes(32, "big") # hash
+ calldata[32:] # r, s, qx, qy
)
intrinsic = intrinsic_gas_calculator(
calldata=tx_calldata,
return_cost_deducted_prior_execution=True,
)
gas_for_loop = per_tx_gas - intrinsic - setup_cost
if gas_for_loop < iteration_cost:
break
expected_opcode_count += gas_for_loop // iteration_cost
txs.append(
Transaction(
to=attack_contract_address,
sender=pre.fund_eoa(),
gas_limit=per_tx_gas,
data=tx_calldata,
)
)
remaining_gas -= per_tx_gas
seed += 10000
assert len(txs) != 0, "No transactions were added to the test."
benchmark_test(
target_opcode=Precompile.P256VERIFY,
skip_gas_used_validation=True,
expected_receipt_status=1,
blocks=[Block(txs=txs)],
expected_opcode_count=expected_opcode_count,
)
|