funga/src/signer/defaultsigner.py

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2020-08-04 23:41:31 +02:00
import logging
import sha3
from eth_keys import KeyAPI
from eth_keys.backends import NativeECCBackend
keys = KeyAPI(NativeECCBackend)
logg = logging.getLogger(__name__)
class Signer:
def __init__(self, keyGetter):
self.keyGetter = keyGetter
def signTransaction(self, tx):
raise NotImplementedError
class ReferenceSigner(Signer):
def __init__(self, keyGetter):
super(ReferenceSigner, self).__init__(keyGetter)
def signTransaction(self, tx):
s = tx.serialize()
h = sha3.keccak_256()
h.update(s)
g = h.digest()
k = keys.PrivateKey(self.keyGetter(tx.sender))
z = keys.ecdsa_sign(message_hash=g, private_key=k)
tx.v = (tx.v * 2) + 35 + z[64]
tx.r = z[:32]
tx.s = z[32:64]
return z