def get_proposer(canonicalized_block):
"""Extract the signer from a block as retrieved from Parity via its JSON RPC interface."""
if canonicalized_block.signature == EMPTY_SIGNATURE:
return EMPTY_ADDRESS
message = bare_hash(canonicalized_block)
signature = keys.Signature(canonicalized_block.signature)
recovered_public_key = keys.ecdsa_recover(message, signature)
return recovered_public_key.to_canonical_address()
def get_signing_address(signed_hash: Union[bytes, str], v: int, r: int, s: int) -> str:
"""
:return: checksummed ethereum address, for example `0x568c93675A8dEb121700A6FAdDdfE7DFAb66Ae4A`
:rtype: str or `NULL_ADDRESS` if signature is not valid
"""
try:
public_key = keys.ecdsa_recover(signed_hash, keys.Signature(vrs=(v - 27, r, s)))
return public_key.to_checksum_address()
except BadSignature:
return NULL_ADDRESS
def recover(data: bytes,
signature: Signature,
hasher: Callable[[bytes], bytes] = eth_sign_sha3) -> Address:
""" eth_recover address from data hash and signature """
_hash = hasher(data)
# ecdsa_recover accepts only standard [0,1] v's so we add support also for [27,28] here
# anything else will raise BadSignature
if signature[-1] >= 27: # support (0,1,27,28) v values
signature = Signature(signature[:-1] + bytes([signature[-1] - 27]))
try:
sig = keys.Signature(signature_bytes=signature)
public_key = keys.ecdsa_recover(message_hash=_hash, signature=sig)
except BadSignature as e:
raise InvalidSignature from e
return public_key.to_canonical_address()