funga/crypto_dev_signer/keystore/reference.py

110 lines
3.3 KiB
Python
Raw Normal View History

2020-08-08 10:45:37 +02:00
# standard imports
2020-08-05 18:14:25 +02:00
import logging
import base64
2021-03-17 15:34:51 +01:00
# external imports
2020-08-05 18:14:25 +02:00
from cryptography.fernet import Fernet
2020-10-20 08:37:20 +02:00
#import psycopg2
#from psycopg2 import sql
#from psycopg2.extensions import make_dsn
from sqlalchemy import create_engine, text
from sqlalchemy.orm import sessionmaker
import sha3
from hexathon import (
strip_0x,
add_0x,
)
2020-08-08 10:45:37 +02:00
# local imports
2020-08-08 11:33:15 +02:00
from .interface import Keystore
2021-03-17 15:34:51 +01:00
#from . import keyapi
2020-12-25 09:21:09 +01:00
from crypto_dev_signer.error import UnknownAccountError
2021-03-17 15:34:51 +01:00
from crypto_dev_signer.encoding import private_key_to_address
2020-08-05 18:14:25 +02:00
2021-08-21 09:32:46 +02:00
logg = logging.getLogger(__name__)
2020-08-05 18:14:25 +02:00
2020-08-05 19:51:22 +02:00
def to_bytes(x):
return x.encode('utf-8')
2020-08-05 18:14:25 +02:00
2020-08-06 11:07:18 +02:00
class ReferenceKeystore(Keystore):
schema = [
2020-09-19 14:23:23 +02:00
"""CREATE TABLE IF NOT EXISTS ethereum (
2020-08-06 11:07:18 +02:00
id SERIAL NOT NULL PRIMARY KEY,
key_ciphertext VARCHAR(256) NOT NULL,
wallet_address_hex CHAR(40) NOT NULL
);
""",
2020-09-19 14:23:23 +02:00
"""CREATE UNIQUE INDEX IF NOT EXISTS ethereum_address_idx ON ethereum ( wallet_address_hex );
2020-08-06 11:07:18 +02:00
""",
]
def __init__(self, dsn, **kwargs):
2020-10-20 08:37:20 +02:00
logg.debug('starting db session with dsn {}'.format(dsn))
self.db_engine = create_engine(dsn)
self.db_session = sessionmaker(bind=self.db_engine)()
for s in self.schema:
self.db_session.execute(s)
2021-02-28 08:39:15 +01:00
self.db_session.commit()
self.symmetric_key = kwargs.get('symmetric_key')
2020-08-05 18:14:25 +02:00
2020-10-20 08:37:20 +02:00
def __del__(self):
logg.debug('closing db session')
self.db_session.close()
def get(self, address, password=None):
safe_address = strip_0x(address).lower()
2020-10-20 08:37:20 +02:00
s = text('SELECT key_ciphertext FROM ethereum WHERE wallet_address_hex = :a')
r = self.db_session.execute(s, {
'a': safe_address,
},
)
2020-12-25 09:21:09 +01:00
try:
k = r.first()[0]
except TypeError:
2021-02-28 08:39:15 +01:00
self.db_session.rollback()
raise UnknownAccountError(safe_address)
2021-02-28 08:39:15 +01:00
self.db_session.commit()
a = self._decrypt(k, password)
return a
2020-09-20 10:00:59 +02:00
def import_key(self, pk, password=None):
2021-03-17 15:34:51 +01:00
address_hex = private_key_to_address(pk)
address_hex_clean = strip_0x(address_hex).lower()
2021-03-17 15:34:51 +01:00
c = self._encrypt(pk.secret, password)
2020-10-20 08:37:20 +02:00
s = text('INSERT INTO ethereum (wallet_address_hex, key_ciphertext) VALUES (:a, :c)') #%s, %s)')
self.db_session.execute(s, {
'a': address_hex_clean,
'c': c.decode('utf-8'),
},
)
self.db_session.commit()
2020-10-26 09:02:29 +01:00
logg.info('added private key for address {}'.format(address_hex_clean))
return add_0x(address_hex)
def _encrypt(self, private_key, password):
f = self._generate_encryption_engine(password)
return f.encrypt(private_key)
def _generate_encryption_engine(self, password):
h = sha3.keccak_256()
h.update(self.symmetric_key)
if password != None:
2020-08-05 19:51:22 +02:00
password_bytes = to_bytes(password)
h.update(password_bytes)
g = h.digest()
return Fernet(base64.b64encode(g))
2020-08-05 18:14:25 +02:00
def _decrypt(self, c, password):
f = self._generate_encryption_engine(password)
return f.decrypt(c.encode('utf-8'))