fix cold storage signing for imported wallets

lib/keystore.py

@@ -173,10 +173,13 @@ class Imported_KeyStore(Software_KeyStore):
             raise InvalidPassword()
         return pk
 
-    def get_pubkey_derivation(self, pubkey):
+    def get_pubkey_derivation(self, x_pubkey):
-        if pubkey not in self.receiving_keys:
+        if x_pubkey[0:2] != 'fd':
             return
-        i = self.receiving_keys.index(pubkey)
+        # fixme: this assumes p2pkh
+        _, addr = xpubkey_to_address(x_pubkey)
+        for i, pubkey in enumerate(self.receiving_pubkeys):
+            if public_key_to_bc_address(pubkey.decode('hex')) == addr:
                 return (False, i)
 
     def update_password(self, old_password, new_password):

lib/wallet.py

@@ -1175,6 +1175,11 @@ class Imported_Wallet(Abstract_Wallet):
 
     def load_addresses(self):
         self.addresses = self.storage.get('addresses', [])
+        self.receiving_addresses = self.addresses
+        self.change_addresses = []
+
+    def get_keystores(self):
+        return []
 
     def has_password(self):
         return False
@@ -1231,6 +1236,12 @@ class Imported_Wallet(Abstract_Wallet):
     def get_change_addresses(self):
         return []
 
+    def add_input_sig_info(self, txin, address):
+        addrtype, hash160 = bc_address_to_hash_160(address)
+        xpubkey = 'fd' + (chr(addrtype) + hash160).encode('hex')
+        txin['x_pubkeys'] = [ xpubkey ]
+        txin['pubkeys'] = [ xpubkey ]
+        txin['signatures'] = [None]
 
 
 class P2PK_Wallet(Abstract_Wallet):