def sender(self):
if not self._sender:
if self.r >= secpk1n or self.s >= secpk1n or self.r == 0 or self.s == 0:
raise InvalidTransaction("Invalid signature values!")
if self.version == 0:
pub = ecrecover_to_pub(self.hash_unsigned, self.v, self.r,
self.s)
if self.version == 1:
pub = ecrecover_to_pub(self.hash_typed, self.v, self.r, self.s)
if pub == b"\x00" * 64:
raise InvalidTransaction(
"Invalid signature (zero privkey cannot sign)")
self._sender = sha3_256(pub)[-20:]
return self._sender
def proc_ecrecover(ext, msg):
# print('ecrecover proc', msg.gas)
OP_GAS = opcodes.GECRECOVER
gas_cost = OP_GAS
if msg.gas < gas_cost:
return 0, 0, []
message_hash_bytes = [0] * 32
msg.data.extract_copy(message_hash_bytes, 0, 0, 32)
message_hash = b''.join(map(ascii_chr, message_hash_bytes))
# TODO: This conversion isn't really necessary.
# TODO: Invesitage if the check below is really needed.
v = msg.data.extract32(32)
r = msg.data.extract32(64)
s = msg.data.extract32(96)
if r >= secp256k1n or s >= secp256k1n or v < 27 or v > 28:
return 1, msg.gas - opcodes.GECRECOVER, []
try:
pub = utils.ecrecover_to_pub(message_hash, v, r, s)
except Exception as e:
return 1, msg.gas - gas_cost, []
o = [0] * 12 + [safe_ord(x) for x in utils.sha3(pub)[-20:]]
return 1, msg.gas - gas_cost, o
def sender(self):
if not self._sender:
if self.r >= secpk1n or self.s >= secpk1n or self.r == 0 or self.s == 0:
raise InvalidTransaction("Invalid signature values!")
if self.version == 0:
pub = ecrecover_to_pub(self.hash_unsigned, self.v, self.r,
self.s)
if self.version == 1:
pub = ecrecover_to_pub(self.hash_typed, self.v, self.r, self.s)
if self.version == 2:
v = 35 - 27 + self.network_id * 2
if self.v < v:
raise InvalidTransaction(
"Invalid signature (wrong v with tx version = 2)")
v = self.v - v
pub = ecrecover_to_pub(self.hash_unsigned, v, self.r, self.s)
if pub == b"\x00" * 64:
raise InvalidTransaction(
"Invalid signature (zero privkey cannot sign)")
self._sender = sha3_256(pub)[-20:]
return self._sender
