Fixed improper signature calculation. Was using hexdigest representation of HMAC, when it should be digest.

Based on this issue: https://github.com/progrium/ruby-jwt/issues/#issue/1

Author: progrium

jwt/__init__.py

@@ -17,9 +17,9 @@
 class DecodeError(Exception): pass
 
 signing_methods = {
-    'HS256': lambda msg, key: hmac.new(key, msg, hashlib.sha256).hexdigest(),
-    'HS384': lambda msg, key: hmac.new(key, msg, hashlib.sha384).hexdigest(),
-    'HS512': lambda msg, key: hmac.new(key, msg, hashlib.sha512).hexdigest(),
+    'HS256': lambda msg, key: hmac.new(key, msg, hashlib.sha256).digest(),
+    'HS384': lambda msg, key: hmac.new(key, msg, hashlib.sha384).digest(),
+    'HS512': lambda msg, key: hmac.new(key, msg, hashlib.sha512).digest(),
 }
 
 def base64url_decode(input):

setup.py

@@ -6,7 +6,7 @@ def read(fname):
 
 setup(
     name = "PyJWT",
-    version = "0.1.1",
+    version = "0.1.2",
     author = "Jeff Lindsay",
     author_email = "jeff.lindsay@twilio.com",
     description = ("JSON Web Token implemtnation in Python"),

tests/test_jwt.py

@@ -23,7 +23,7 @@ def test_bad_secret(self):
     def test_decodes_valid_jwt(self):
         example_payload = {"hello": "world"}
         example_secret = "secret"
-        example_jwt = "eyJhbGciOiAiSFMyNTYiLCAidHlwIjogIkpXVCJ9.eyJoZWxsbyI6ICJ3b3JsZCJ9.YjZmNmEwMmMzMmU4NmEyMjRhYzRlMmFhYTQxNWQyMTA2Y2JiNDk4NGEyN2Q5ODYzOWVkODI2ZjVjYjY5Y2EzZg"
+        example_jwt = "eyJhbGciOiAiSFMyNTYiLCAidHlwIjogIkpXVCJ9.eyJoZWxsbyI6ICJ3b3JsZCJ9.tvagLDLoaiJKxOKqpBXSEGy7SYSifZhjntgm9ctpyj8"
         decoded_payload = jwt.decode(example_jwt, example_secret)
         self.assertEqual(decoded_payload, example_payload)