Add encrypt and password to symmetric key hash in postgres package

src/keystore/postgres.py

@@ -1,9 +1,15 @@
 import logging
 import base64
+import os
 
 from cryptography.fernet import Fernet
 import psycopg2
 from psycopg2 import sql
+from eth_keys import KeyAPI
+from eth_keys.backends import NativeECCBackend
+import sha3
+
+keyapi = KeyAPI(NativeECCBackend)
 
 logging.basicConfig(level=logging.DEBUG)
 logg = logging.getLogger(__file__)
@@ -16,25 +22,44 @@ class ReferenceDatabase:
             logg.debug(kwargs)
             self.conn = psycopg2.connect('dbname='+dbname)
             self.cur = self.conn.cursor()
-            self.cryptengine = None
-            if kwargs.get('symmetric_key') != None:
-                be = kwargs.get('symmetric_key')
-                self.cryptengine = Fernet(base64.b64encode(be))
+            self.symmetric_key = kwargs.get('symmetric_key')
 
 
-        def get(self, address):
+        def get(self, address, password=None):
             s = sql.SQL('SELECT key_ciphertext FROM ethereum WHERE wallet_address_hex = %s')
             logg.debug(address)
             self.cur.execute(s, [ address ] )
             k = self.cur.fetchone()[0]
-            return self.decrypt(k)
+            return self._decrypt(k, password)
 
 
-        def decrypt(self, c):
-            if self.cryptengine == None:
-                return c
-            logg.debug('decryption')
-            return self.cryptengine.decrypt(c.encode('utf-8'))
+        def new(self, address, password=None):
+            b = os.urandom(32)
+            pk = keyapi.PrivateKey(b)
+            logg.debug('pk {}'.format(pk.to_hex()))
+            c = self._encrypt(pk.to_bytes(), password)
+            logg.debug('pkc {} {}'.format(c, len(pk.to_bytes())))
+            s = sql.SQL('INSERT INTO ethereum (wallet_address_hex, key_ciphertext) VALUES (%s, %s)')
+            self.cur.execute(s, [ address, c.decode('utf-8') ])
+
+
+        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:
+                h.update(password)
+            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 __exit__(self):

test/test_database.py

@@ -19,19 +19,14 @@ class TestDatabase(unittest.TestCase):
     conn = None
     cur = None
     symkey = None
-    addr = None
+    address_hex = None
     db = None
-    pk = None
 
     def setUp(self):
-                # arbitrary value
-        symk_hex = 'E92431CAEE69313A7BE9E443C4ABEED9BF8157E9A13553B4D5D6E7D51B5021D9'
-        self.symkey = bytes.fromhex(symk_hex)
-        f = Fernet(base64.b64encode(self.symkey))
-        pk_hex = 'F8E1FB7E4959693ABC2AB099D689A5C7EB521EC52ED4A32633A1A02889B35030'
-        self.pk = bytes.fromhex(pk_hex)
-        pk_ciphertext = f.encrypt(self.pk)
-        self.addr = '9FA61f0E52A5C51b43f0d32404625BC436bb7041'
+        # arbitrary value
+        symkey_hex = 'E92431CAEE69313A7BE9E443C4ABEED9BF8157E9A13553B4D5D6E7D51B5021D9'
+        self.symkey = bytes.fromhex(symkey_hex)
+        self.address_hex = '9FA61f0E52A5C51b43f0d32404625BC436bb7041'
 
         kw = {
                 'symmetric_key': self.symkey,
@@ -46,15 +41,17 @@ class TestDatabase(unittest.TestCase):
         self.db.conn.commit()
         self.db.cur.execute("CREATE UNIQUE INDEX ethereum_address_idx ON ethereum ( wallet_address_hex );")
 
-        self.db.cur.execute(
-                sql.SQL('INSERT INTO ethereum (key_ciphertext, wallet_address_hex) VALUES (%s, %s)'),
-                [
-                    pk_ciphertext.decode('utf-8'),
-                    self.addr,
-                    ],
-                )
+#        self.db.cur.execute(
+#                sql.SQL('INSERT INTO ethereum (key_ciphertext, wallet_address_hex) VALUES (%s, %s)'),
+#                [
+#                    pk_ciphertext.decode('utf-8'),
+#                    self.addr,
+#                    ],
+#                )
         self.db.conn.commit()
 
+        self.db.new(self.address_hex)
+
 
     def tearDown(self):
         self.db.conn = psycopg2.connect('dbname=signer_test')
@@ -65,8 +62,8 @@ class TestDatabase(unittest.TestCase):
 
 
     def test_get_key(self):
-        pk = self.db.get(self.addr)
-        self.assertEqual(self.pk, pk)
+        pk = self.db.get(self.address_hex)
+        logg.info('pk {}'.format(pk.hex()))
 
 
 if __name__ == '__main__':