Merge pull request #249 from dreid/hmac-context-from-backend

Get a HashContext from the hmac backend like we do a CipherContext

1 files changed, 3 insertions, 4 deletions

diff --git a/cryptography/hazmat/primitives/hmac.py b/cryptography/hazmat/primitives/hmac.py
index ed2dd54a..0f1b4fac 100644
--- a/cryptography/hazmat/primitives/hmac.py
+++ b/cryptography/hazmat/primitives/hmac.py
@@ -39,16 +39,15 @@ class HMAC(object):
     def update(self, msg):
         if isinstance(msg, six.text_type):
             raise TypeError("Unicode-objects must be encoded before hashing")
-        self._backend.hmacs.update_ctx(self._ctx, msg)
+        self._ctx.update(msg)
 
     def copy(self):
         return HMAC(
             self._key,
             self.algorithm,
             backend=self._backend,
-            ctx=self._backend.hmacs.copy_ctx(self._ctx)
+            ctx=self._ctx.copy()
         )
 
     def finalize(self):
-        return self._backend.hmacs.finalize_ctx(self._ctx,
-                                                self.algorithm.digest_size)
+        return self._ctx.finalize()