load_device_by_mnemonic: normalize mnemonic before validation (#95)

trezorlib/client.py

@@ -859,16 +859,16 @@ class ProtocolMixin(object):
     @field('message')
     @expect(proto.Success)
     def load_device_by_mnemonic(self, mnemonic, pin, passphrase_protection, label, language, skip_checksum=False):
-        m = Mnemonic('english')
-        if not skip_checksum and not m.check(mnemonic):
-            raise Exception("Invalid mnemonic checksum")
-
         # Convert mnemonic to UTF8 NKFD
         mnemonic = Mnemonic.normalize_string(mnemonic)
 
         # Convert mnemonic to ASCII stream
         mnemonic = normalize_nfc(mnemonic)
 
+        m = Mnemonic('english')
+        if not skip_checksum and not m.check(mnemonic):
+            raise Exception("Invalid mnemonic checksum")
+
         if self.features.initialized:
             raise Exception("Device is initialized already. Call wipe_device() and try again.")