96 lines
2.8 KiB
Python
96 lines
2.8 KiB
Python
# standard imports
|
|
import logging
|
|
import base64
|
|
import os
|
|
|
|
# third-party imports
|
|
from cryptography.fernet import Fernet
|
|
import psycopg2
|
|
from psycopg2 import sql
|
|
from eth_keys import KeyAPI
|
|
from eth_keys.backends import NativeECCBackend
|
|
import sha3
|
|
|
|
# local imports
|
|
from crypto_dev_signer.common import strip_hex_prefix
|
|
from .interface import Keystore
|
|
|
|
keyapi = KeyAPI(NativeECCBackend)
|
|
|
|
logging.basicConfig(level=logging.DEBUG)
|
|
logg = logging.getLogger(__file__)
|
|
|
|
|
|
def to_bytes(x):
|
|
return x.encode('utf-8')
|
|
|
|
|
|
class ReferenceKeystore(Keystore):
|
|
|
|
schema = [
|
|
"""CREATE TABLE ethereum (
|
|
id SERIAL NOT NULL PRIMARY KEY,
|
|
key_ciphertext VARCHAR(256) NOT NULL,
|
|
wallet_address_hex CHAR(40) NOT NULL
|
|
);
|
|
""",
|
|
"""CREATE UNIQUE INDEX ethereum_address_idx ON ethereum ( wallet_address_hex );
|
|
""",
|
|
]
|
|
|
|
def __init__(self, dbname, **kwargs):
|
|
self.conn = psycopg2.connect('dbname=' + dbname)
|
|
self.cur = self.conn.cursor()
|
|
self.symmetric_key = kwargs.get('symmetric_key')
|
|
|
|
|
|
def get(self, address, password=None):
|
|
safe_address = strip_hex_prefix(address)
|
|
s = sql.SQL('SELECT key_ciphertext FROM ethereum WHERE wallet_address_hex = %s')
|
|
self.cur.execute(s, [ safe_address ] )
|
|
k = self.cur.fetchone()[0]
|
|
return self._decrypt(k, password)
|
|
|
|
|
|
def new(self, password=None):
|
|
b = os.urandom(32)
|
|
pk = keyapi.PrivateKey(b)
|
|
|
|
pubk = keyapi.private_key_to_public_key(pk)
|
|
address_hex = pubk.to_checksum_address()
|
|
address_hex_clean = strip_hex_prefix(address_hex)
|
|
|
|
logg.debug('address {}'.format(address_hex_clean))
|
|
c = self._encrypt(pk.to_bytes(), password)
|
|
s = sql.SQL('INSERT INTO ethereum (wallet_address_hex, key_ciphertext) VALUES (%s, %s)')
|
|
self.cur.execute(s, [ address_hex_clean, c.decode('utf-8') ])
|
|
self.conn.commit()
|
|
return 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:
|
|
password_bytes = to_bytes(password)
|
|
h.update(password_bytes)
|
|
g = h.digest()
|
|
return Fernet(base64.b64encode(g))
|
|
|
|
|
|
def _decrypt(self, c, password):
|
|
f = self._generate_encryption_engine(password)
|
|
return f.decrypt(c.encode('utf-8'))
|
|
|
|
|
|
def __del__(self):
|
|
logg.debug('closing database')
|
|
self.conn.commit()
|
|
self.cur.close()
|
|
self.conn.close()
|