def call_backend_verify(self, pubkey: PublicKey, signature: Signature, msg_hash: bytes) -> bool:
"""
Verifies a hex string signature and message hash are from the provided
public key.
"""
is_valid_sig = signature.verify_msg_hash(msg_hash, pubkey)
sig_pubkey = signature.recover_public_key_from_msg_hash(msg_hash)
return is_valid_sig and (sig_pubkey == pubkey)
def ecrecover(signature, message):
message_hash = to_bytes(hexstr=message)
message_hash = solidityKeccak(
['string', 'bytes32'],
['\x19Ethereum Signed Message:\n32', message_hash])
_signature = Signature(to_bytes(hexstr=signature))
public_key = _signature.recover_public_key_from_msg_hash(message_hash)
return public_key.to_checksum_address()
def get_posw_info(
config: POSWConfig,
header: Header,
stakes: int,
block_cnt: Dict[bytes, int],
stake_per_block: Optional[int] = None,
signer: Optional[bytes] = None,
) -> Optional[PoSWInfo]:
if (not (config.ENABLED and header.create_time >= config.ENABLE_TIMESTAMP)
or header.height == 0):
return None
# evaluate stakes before the to-be-added block
coinbase_recipient = header.coinbase_address.recipient
required_stakes_per_block = stake_per_block or config.TOTAL_STAKE_PER_BLOCK
block_threshold = min(config.WINDOW_SIZE,
stakes // required_stakes_per_block)
cnt = block_cnt.get(coinbase_recipient, 0)
diff = header.difficulty
ret = lambda success: PoSWInfo(
diff // config.get_diff_divider(header.create_time)
if success else diff,
block_threshold,
# mined blocks should include current one, assuming success
posw_mined_blocks=cnt + 1,
)
# fast path
if block_threshold == 0:
return ret(False)
# need to check signature if signer is specified. only applies for root chain
if signer:
check(isinstance(header, RootBlockHeader))
if signer == bytes(20):
return ret(False)
block_sig = Signature(header.signature)
try:
pubk = block_sig.recover_public_key_from_msg_hash(
header.get_hash_for_mining())
except BadSignature:
return ret(False)
if pubk.to_canonical_address() != signer:
return ret(False)
return ret(cnt < block_threshold)
def test_sign():
# 对应智能合约 keccak256(abi.encodePacked(uint40(commitLastBlock), commit));
commitLastBlock = unhexlify('%010x' % 0xb34464) # 和uint40对应
commit = unhexlify(
'24027f1fe6692863385b95ab253f0700a35d03a8967dff8588e2de6b066b44e4')
h = keccak(commitLastBlock + commit)
print(hexlify(h))
#正确keccak结果, 正确是: A5CA2F7474A762F6EA97585911E0CC48FB1282D53A0A602056B61216AF7637FD
sig = '2e608766579a55fffd6d7872e89d56642980358160b877fdb00855e716a8cbeb'
sig += '3faac77026378c125f5ead4bb0cbf303554ba85d9920d158a9aacecfa2ada6a8'
sig += '00' # 27
sig = unhexlify(sig)
sg = Signature(sig)
pubk = sg.recover_public_key_from_msg_hash(h)
print(pubk.to_checksum_address()
) # 正确的应是 0xb00b5ca7ec0502f2f269e99b91ebbccbce9cccec
pass
