def ecdsa_raw_sign(self, msg_hash, private_key):
signature = self.keys.PrivateKey(private_key).sign_recoverable(
msg_hash, hasher=None)
v = safe_ord(signature[64]) + 27
r = big_endian_to_int(signature[0:32])
s = big_endian_to_int(signature[32:64])
return v, r, s
def _unpack(message: AnyStr) -> Tuple[datatypes.PublicKey, int, List[Any], AnyStr]:
"""Unpack a UDP message received from a remote node.
Returns the public key used to sign the message, the cmd ID, payload and hash.
"""
message_hash = message[:MAC_SIZE]
if message_hash != keccak(message[MAC_SIZE:]):
raise WrongMAC("Wrong msg mac")
signature = keys.Signature(message[MAC_SIZE:HEAD_SIZE])
signed_data = message[HEAD_SIZE:]
remote_pubkey = signature.recover_public_key_from_msg(signed_data)
cmd_id = safe_ord(message[HEAD_SIZE])
cmd = CMD_ID_MAP[cmd_id]
payload = rlp.decode(message[HEAD_SIZE + 1:], strict=False)
# Ignore excessive list elements as required by EIP-8.
payload = payload[:cmd.elem_count]
return remote_pubkey, cmd_id, payload, message_hash
def remove_chars(s, chars):
d = {safe_ord(c): None for c in chars}
return s.translate(d)
