From dc491c48cd313c7d92e141ea91d8904f635c71b5 Mon Sep 17 00:00:00 2001
From: Michael Merickel <michael@digitalartefacts.com>
Date: Sat, 19 Oct 2013 15:20:21 -0500
Subject: remove unnecessary length check, slices are magic

---
 pyramid/session.py | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/pyramid/session.py b/pyramid/session.py
index 9ff9ffa20..2471d94ad 100644
--- a/pyramid/session.py
+++ b/pyramid/session.py
@@ -581,11 +581,7 @@ def SignedCookieSessionFactory(
         except (binascii.Error, TypeError) as e:
             raise ValueError('Badly formed base64 data: %s' % e)
 
-        cstruct_size = len(fstruct) - digest_size
-        if cstruct_size < 0:
-            raise ValueError('Input is too short.')
-
-        cstruct = fstruct[:cstruct_size]
+        cstruct = fstruct[:-digest_size]
         expected_sig = fstruct[-digest_size:]
 
         sig = hmac.new(salted_secret, cstruct, digestmod).digest()
-- 
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