1 files changed, 21 insertions, 0 deletions
diff --git a/tests/utils.py b/tests/utils.py
index bf74e78..7722702 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -1,4 +1,5 @@
 import os
+import struct
 
 from calendar import timegm
 from datetime import datetime
@@ -27,3 +28,23 @@ def utc_timestamp():
 def key_path(key_name):
     return os.path.join(os.path.dirname(os.path.realpath(__file__)),
                         'keys', key_name)
+
+# Borrowed from `cryptography`
+if hasattr(int, "from_bytes"):
+    int_from_bytes = int.from_bytes
+else:
+    def int_from_bytes(data, byteorder, signed=False):
+        assert byteorder == 'big'
+        assert not signed
+
+        if len(data) % 4 != 0:
+            data = (b'\x00' * (4 - (len(data) % 4))) + data
+
+        result = 0
+
+        while len(data) > 0:
+            digit, = struct.unpack('>I', data[:4])
+            result = (result << 32) + digit
+            data = data[4:]
+
+        return result