add python 3 support to signature check (#25296)

hobo/signature.py

@@ -5,6 +5,7 @@ import hashlib
 import urllib
 import random
 
+from django.utils import six
 from django.utils.encoding import smart_bytes
 from django.utils.http import quote, urlencode
 from django.utils.six.moves.urllib import parse as urlparse
@@ -69,6 +70,10 @@ def check_string(s, signature, key, algo='sha256'):
     if len(signature2) != len(signature):
         return False
     res = 0
-    for a, b in zip(signature, signature2):
-        res |= ord(a) ^ ord(b)
+    if six.PY3:
+        for a, b in zip(signature, signature2):
+            res |= a ^ b
+    else:
+        for a, b in zip(signature, signature2):
+            res |= ord(a) ^ ord(b)
     return res == 0