80 lines
2.7 KiB
Python
80 lines
2.7 KiB
Python
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# standard imports
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import logging
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# external imports
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import sha3
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import coincurve
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from hexathon import int_to_minbytes
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# local imports
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from funga.signer import Signer
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from funga.eth.encoding import chain_id_to_v
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logg = logging.getLogger(__name__)
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class EIP155Signer(Signer):
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def __init__(self, keyGetter):
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super(EIP155Signer, self).__init__(keyGetter)
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def sign_transaction(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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message_to_sign = h.digest()
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z = self.sign_pure(tx.sender, message_to_sign, password)
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return z
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def sign_transaction_to_rlp(self, tx, password=None):
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chain_id = int.from_bytes(tx.v, byteorder='big')
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sig = self.sign_transaction(tx, password)
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tx.apply_signature(chain_id, sig)
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return tx.rlp_serialize()
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def sign_transaction_to_wire(self, tx, password=None):
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return self.sign_transaction_to_rlp(tx, password=password)
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def sign_ethereum_message(self, address, message, password=None):
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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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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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message = 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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logg.debug('unhandled format {}'.format(type(message).__name__))
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raise ValueError('message must be type str or bytes, received {}'.format(type(message).__name__))
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ethereumed_message_header = b'\x19' + 'Ethereum Signed Message:\n{}'.format(len(message)).encode('utf-8')
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h = sha3.keccak_256()
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h.update(ethereumed_message_header + message)
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message_to_sign = h.digest()
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z = self.sign_pure(address, message_to_sign, password)
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return z
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# TODO: generic sign should be moved to non-eth context
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def sign_pure(self, address, message, password=None):
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pk = coincurve.PrivateKey(secret=self.keyGetter.get(address, password))
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z = pk.sign_recoverable(hasher=None, message=message)
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return z
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def sign_message(self, address, message, password=None, dialect='eth'):
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if dialect == None:
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return self.sign_pure(address, message, password=password)
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elif dialect == 'eth':
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return self.sign_ethereum_message(address, message, password=password)
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raise ValueError('Unknown message sign dialect "{}"'.format(dialect))
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