We don't need six.binary_type, it's always bytes

1 files changed, 2 insertions, 4 deletions

diff --git a/cryptography/hazmat/primitives/cmac.py b/cryptography/hazmat/primitives/cmac.py
index b01c5170..7f7cc0f0 100644
--- a/cryptography/hazmat/primitives/cmac.py
+++ b/cryptography/hazmat/primitives/cmac.py
@@ -13,8 +13,6 @@
 
 from __future__ import absolute_import, division, print_function
 
-import six
-
 from cryptography import utils
 from cryptography.exceptions import (
     AlreadyFinalized, InvalidSignature, UnsupportedAlgorithm, _Reasons
@@ -47,7 +45,7 @@ class CMAC(object):
     def update(self, data):
         if self._ctx is None:
             raise AlreadyFinalized("Context was already finalized")
-        if not isinstance(data, six.binary_type):
+        if not isinstance(data, bytes):
             raise TypeError("data must be bytes")
         self._ctx.update(data)
 
@@ -59,7 +57,7 @@ class CMAC(object):
         return digest
 
     def verify(self, signature):
-        if not isinstance(signature, six.binary_type):
+        if not isinstance(signature, bytes):
             raise TypeError("signature must be bytes")
         digest = self.finalize()
         if not constant_time.bytes_eq(digest, signature):