65 lines
1.8 KiB
Python
65 lines
1.8 KiB
Python
import logging
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import sha3
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from eth_keys import KeyAPI
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from eth_keys.backends import NativeECCBackend
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keys = KeyAPI(NativeECCBackend)
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logg = logging.getLogger(__name__)
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class Signer:
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def __init__(self, keyGetter):
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self.keyGetter = keyGetter
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def signTransaction(self, tx, password=None):
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raise NotImplementedError
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class ReferenceSigner(Signer):
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def __init__(self, keyGetter):
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super(ReferenceSigner, self).__init__(keyGetter)
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def signTransaction(self, tx, password=None):
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s = tx.rlp_serialize()
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h = sha3.keccak_256()
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h.update(s)
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g = h.digest()
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k = keys.PrivateKey(self.keyGetter.get(tx.sender, password))
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z = keys.ecdsa_sign(message_hash=g, private_key=k)
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vnum = int.from_bytes(tx.v, 'big')
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v = (vnum * 2) + 35 + z[64]
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byts = ((v.bit_length()-1)/8)+1
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tx.v = v.to_bytes(int(byts), 'big')
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tx.r = z[:32]
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tx.s = z[32:64]
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if tx.r[0] == 0:
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tx.r = tx.r[1:]
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if tx.s[0] == 0:
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tx.r = tx.s[1:]
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return z
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def signEthereumMessage(self, address, message, password=None):
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#msg = b'\x19Ethereum Signed Message:\n{}{}'.format(len(message), message)
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k = keys.PrivateKey(self.keyGetter.get(address, password))
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#z = keys.ecdsa_sign(message_hash=g, private_key=k)
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z = None
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if type(message).__name__ == 'str':
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logg.debug('signing message in "str" format: {}'.format(message))
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z = k.sign_msg(bytes.fromhex(message))
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elif type(message).__name__ == 'bytes':
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logg.debug('signing message in "bytes" format: {}'.format(message.hex()))
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z = k.sign_msg(message)
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else:
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raise ValueError('message must be type str or bytes, received {}'.format(type(message).__name__))
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return z
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