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-rw-r--r--cryptography/hazmat/__init__.py2
-rw-r--r--cryptography/hazmat/backends/__init__.py2
-rw-r--r--cryptography/hazmat/backends/commoncrypto/__init__.py2
-rw-r--r--cryptography/hazmat/backends/openssl/__init__.py2
-rw-r--r--cryptography/hazmat/bindings/__init__.py2
-rw-r--r--cryptography/hazmat/bindings/commoncrypto/__init__.py2
-rw-r--r--cryptography/hazmat/bindings/commoncrypto/common_cryptor.py2
-rw-r--r--cryptography/hazmat/bindings/commoncrypto/common_digest.py2
-rw-r--r--cryptography/hazmat/bindings/commoncrypto/common_hmac.py2
-rw-r--r--cryptography/hazmat/bindings/commoncrypto/common_key_derivation.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/__init__.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/aes.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/asn1.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/bignum.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/bio.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/conf.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/crypto.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/dh.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/dsa.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/ec.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/engine.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/err.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/evp.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/hmac.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/nid.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/objects.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/opensslv.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/osrandom_engine.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/pem.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/pkcs12.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/pkcs7.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/rand.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/rsa.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/ssl.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/x509.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/x509name.py2
-rw-r--r--cryptography/hazmat/bindings/openssl/x509v3.py2
-rw-r--r--cryptography/hazmat/primitives/__init__.py14
-rw-r--r--cryptography/hazmat/primitives/asymmetric/__init__.py14
-rw-r--r--cryptography/hazmat/primitives/kdf/__init__.py14
-rw-r--r--cryptography/hazmat/primitives/kdf/hkdf.py2
-rw-r--r--cryptography/hazmat/primitives/padding.py2
-rw-r--r--cryptography/hazmat/primitives/twofactor/__init__.py14
43 files changed, 134 insertions, 0 deletions
diff --git a/cryptography/hazmat/__init__.py b/cryptography/hazmat/__init__.py
index 55c925c6..2f420574 100644
--- a/cryptography/hazmat/__init__.py
+++ b/cryptography/hazmat/__init__.py
@@ -10,3 +10,5 @@
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
+
+from __future__ import absolute_import, division, print_function
diff --git a/cryptography/hazmat/backends/__init__.py b/cryptography/hazmat/backends/__init__.py
index 406b37e5..59d1bc6c 100644
--- a/cryptography/hazmat/backends/__init__.py
+++ b/cryptography/hazmat/backends/__init__.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
from cryptography.hazmat.backends import openssl
from cryptography.hazmat.backends.multibackend import MultiBackend
from cryptography.hazmat.bindings.commoncrypto.binding import (
diff --git a/cryptography/hazmat/backends/commoncrypto/__init__.py b/cryptography/hazmat/backends/commoncrypto/__init__.py
index 64a1c01c..f080394f 100644
--- a/cryptography/hazmat/backends/commoncrypto/__init__.py
+++ b/cryptography/hazmat/backends/commoncrypto/__init__.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
from cryptography.hazmat.backends.commoncrypto.backend import backend
diff --git a/cryptography/hazmat/backends/openssl/__init__.py b/cryptography/hazmat/backends/openssl/__init__.py
index a8dfad06..25885e18 100644
--- a/cryptography/hazmat/backends/openssl/__init__.py
+++ b/cryptography/hazmat/backends/openssl/__init__.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
from cryptography.hazmat.backends.openssl.backend import backend
diff --git a/cryptography/hazmat/bindings/__init__.py b/cryptography/hazmat/bindings/__init__.py
index 55c925c6..2f420574 100644
--- a/cryptography/hazmat/bindings/__init__.py
+++ b/cryptography/hazmat/bindings/__init__.py
@@ -10,3 +10,5 @@
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
+
+from __future__ import absolute_import, division, print_function
diff --git a/cryptography/hazmat/bindings/commoncrypto/__init__.py b/cryptography/hazmat/bindings/commoncrypto/__init__.py
index 55c925c6..2f420574 100644
--- a/cryptography/hazmat/bindings/commoncrypto/__init__.py
+++ b/cryptography/hazmat/bindings/commoncrypto/__init__.py
@@ -10,3 +10,5 @@
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
+
+from __future__ import absolute_import, division, print_function
diff --git a/cryptography/hazmat/bindings/commoncrypto/common_cryptor.py b/cryptography/hazmat/bindings/commoncrypto/common_cryptor.py
index 8f03bc3f..9bd03a7c 100644
--- a/cryptography/hazmat/bindings/commoncrypto/common_cryptor.py
+++ b/cryptography/hazmat/bindings/commoncrypto/common_cryptor.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <CommonCrypto/CommonCryptor.h>
"""
diff --git a/cryptography/hazmat/bindings/commoncrypto/common_digest.py b/cryptography/hazmat/bindings/commoncrypto/common_digest.py
index ec0fcc92..c59200cb 100644
--- a/cryptography/hazmat/bindings/commoncrypto/common_digest.py
+++ b/cryptography/hazmat/bindings/commoncrypto/common_digest.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <CommonCrypto/CommonDigest.h>
"""
diff --git a/cryptography/hazmat/bindings/commoncrypto/common_hmac.py b/cryptography/hazmat/bindings/commoncrypto/common_hmac.py
index a4bf9009..4f54b62b 100644
--- a/cryptography/hazmat/bindings/commoncrypto/common_hmac.py
+++ b/cryptography/hazmat/bindings/commoncrypto/common_hmac.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <CommonCrypto/CommonHMAC.h>
"""
diff --git a/cryptography/hazmat/bindings/commoncrypto/common_key_derivation.py b/cryptography/hazmat/bindings/commoncrypto/common_key_derivation.py
index 85def1e9..e8cc03ef 100644
--- a/cryptography/hazmat/bindings/commoncrypto/common_key_derivation.py
+++ b/cryptography/hazmat/bindings/commoncrypto/common_key_derivation.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <CommonCrypto/CommonKeyDerivation.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/__init__.py b/cryptography/hazmat/bindings/openssl/__init__.py
index 55c925c6..2f420574 100644
--- a/cryptography/hazmat/bindings/openssl/__init__.py
+++ b/cryptography/hazmat/bindings/openssl/__init__.py
@@ -10,3 +10,5 @@
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
+
+from __future__ import absolute_import, division, print_function
diff --git a/cryptography/hazmat/bindings/openssl/aes.py b/cryptography/hazmat/bindings/openssl/aes.py
index 95ed5271..17c154cf 100644
--- a/cryptography/hazmat/bindings/openssl/aes.py
+++ b/cryptography/hazmat/bindings/openssl/aes.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/aes.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/asn1.py b/cryptography/hazmat/bindings/openssl/asn1.py
index aeaf316e..d908b198 100644
--- a/cryptography/hazmat/bindings/openssl/asn1.py
+++ b/cryptography/hazmat/bindings/openssl/asn1.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/asn1.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/bignum.py b/cryptography/hazmat/bindings/openssl/bignum.py
index e843099e..a40397db 100644
--- a/cryptography/hazmat/bindings/openssl/bignum.py
+++ b/cryptography/hazmat/bindings/openssl/bignum.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/bn.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/bio.py b/cryptography/hazmat/bindings/openssl/bio.py
index 28172689..0c521b4d 100644
--- a/cryptography/hazmat/bindings/openssl/bio.py
+++ b/cryptography/hazmat/bindings/openssl/bio.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/bio.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/conf.py b/cryptography/hazmat/bindings/openssl/conf.py
index 6d818cf1..dda35e86 100644
--- a/cryptography/hazmat/bindings/openssl/conf.py
+++ b/cryptography/hazmat/bindings/openssl/conf.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/conf.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/crypto.py b/cryptography/hazmat/bindings/openssl/crypto.py
index 81d13b73..99e1a61d 100644
--- a/cryptography/hazmat/bindings/openssl/crypto.py
+++ b/cryptography/hazmat/bindings/openssl/crypto.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/crypto.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/dh.py b/cryptography/hazmat/bindings/openssl/dh.py
index ecc62e98..1791a670 100644
--- a/cryptography/hazmat/bindings/openssl/dh.py
+++ b/cryptography/hazmat/bindings/openssl/dh.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/dh.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/dsa.py b/cryptography/hazmat/bindings/openssl/dsa.py
index 664296d3..40d3b8ee 100644
--- a/cryptography/hazmat/bindings/openssl/dsa.py
+++ b/cryptography/hazmat/bindings/openssl/dsa.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/dsa.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/ec.py b/cryptography/hazmat/bindings/openssl/ec.py
index 9d6f7cb9..2617fe2a 100644
--- a/cryptography/hazmat/bindings/openssl/ec.py
+++ b/cryptography/hazmat/bindings/openssl/ec.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#ifndef OPENSSL_NO_EC
#include <openssl/ec.h>
diff --git a/cryptography/hazmat/bindings/openssl/engine.py b/cryptography/hazmat/bindings/openssl/engine.py
index 77118e81..364232e0 100644
--- a/cryptography/hazmat/bindings/openssl/engine.py
+++ b/cryptography/hazmat/bindings/openssl/engine.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/engine.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/err.py b/cryptography/hazmat/bindings/openssl/err.py
index f21d98b6..806d0ea0 100644
--- a/cryptography/hazmat/bindings/openssl/err.py
+++ b/cryptography/hazmat/bindings/openssl/err.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/err.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/evp.py b/cryptography/hazmat/bindings/openssl/evp.py
index 77128c47..ad4b568e 100644
--- a/cryptography/hazmat/bindings/openssl/evp.py
+++ b/cryptography/hazmat/bindings/openssl/evp.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/evp.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/hmac.py b/cryptography/hazmat/bindings/openssl/hmac.py
index 4b81c9df..6a64b92c 100644
--- a/cryptography/hazmat/bindings/openssl/hmac.py
+++ b/cryptography/hazmat/bindings/openssl/hmac.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/hmac.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/nid.py b/cryptography/hazmat/bindings/openssl/nid.py
index cb83c1ba..ea6fd4d6 100644
--- a/cryptography/hazmat/bindings/openssl/nid.py
+++ b/cryptography/hazmat/bindings/openssl/nid.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = ""
TYPES = """
diff --git a/cryptography/hazmat/bindings/openssl/objects.py b/cryptography/hazmat/bindings/openssl/objects.py
index 0abc42d6..557c0158 100644
--- a/cryptography/hazmat/bindings/openssl/objects.py
+++ b/cryptography/hazmat/bindings/openssl/objects.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/objects.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/opensslv.py b/cryptography/hazmat/bindings/openssl/opensslv.py
index 397f4ca2..e4aa6212 100644
--- a/cryptography/hazmat/bindings/openssl/opensslv.py
+++ b/cryptography/hazmat/bindings/openssl/opensslv.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/opensslv.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/osrandom_engine.py b/cryptography/hazmat/bindings/openssl/osrandom_engine.py
index 0903a4bf..462997cc 100644
--- a/cryptography/hazmat/bindings/openssl/osrandom_engine.py
+++ b/cryptography/hazmat/bindings/openssl/osrandom_engine.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#ifdef _WIN32
#include <Wincrypt.h>
diff --git a/cryptography/hazmat/bindings/openssl/pem.py b/cryptography/hazmat/bindings/openssl/pem.py
index 942cba34..e42fc6fe 100644
--- a/cryptography/hazmat/bindings/openssl/pem.py
+++ b/cryptography/hazmat/bindings/openssl/pem.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/pem.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/pkcs12.py b/cryptography/hazmat/bindings/openssl/pkcs12.py
index bd01e756..a8f106f6 100644
--- a/cryptography/hazmat/bindings/openssl/pkcs12.py
+++ b/cryptography/hazmat/bindings/openssl/pkcs12.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/pkcs12.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/pkcs7.py b/cryptography/hazmat/bindings/openssl/pkcs7.py
index 43f9540b..1343e566 100644
--- a/cryptography/hazmat/bindings/openssl/pkcs7.py
+++ b/cryptography/hazmat/bindings/openssl/pkcs7.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/pkcs7.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/rand.py b/cryptography/hazmat/bindings/openssl/rand.py
index 0e645fbc..7b1be9df 100644
--- a/cryptography/hazmat/bindings/openssl/rand.py
+++ b/cryptography/hazmat/bindings/openssl/rand.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/rand.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/rsa.py b/cryptography/hazmat/bindings/openssl/rsa.py
index f895cd02..c6356101 100644
--- a/cryptography/hazmat/bindings/openssl/rsa.py
+++ b/cryptography/hazmat/bindings/openssl/rsa.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/rsa.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/ssl.py b/cryptography/hazmat/bindings/openssl/ssl.py
index 25bef49a..362e24e0 100644
--- a/cryptography/hazmat/bindings/openssl/ssl.py
+++ b/cryptography/hazmat/bindings/openssl/ssl.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/ssl.h>
"""
diff --git a/cryptography/hazmat/bindings/openssl/x509.py b/cryptography/hazmat/bindings/openssl/x509.py
index e8b036c3..e800d272 100644
--- a/cryptography/hazmat/bindings/openssl/x509.py
+++ b/cryptography/hazmat/bindings/openssl/x509.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/ssl.h>
diff --git a/cryptography/hazmat/bindings/openssl/x509name.py b/cryptography/hazmat/bindings/openssl/x509name.py
index bf627d61..50abee2a 100644
--- a/cryptography/hazmat/bindings/openssl/x509name.py
+++ b/cryptography/hazmat/bindings/openssl/x509name.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/x509.h>
diff --git a/cryptography/hazmat/bindings/openssl/x509v3.py b/cryptography/hazmat/bindings/openssl/x509v3.py
index 6d2d2361..02ec250a 100644
--- a/cryptography/hazmat/bindings/openssl/x509v3.py
+++ b/cryptography/hazmat/bindings/openssl/x509v3.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
INCLUDES = """
#include <openssl/x509v3.h>
"""
diff --git a/cryptography/hazmat/primitives/__init__.py b/cryptography/hazmat/primitives/__init__.py
index e69de29b..2f420574 100644
--- a/cryptography/hazmat/primitives/__init__.py
+++ b/cryptography/hazmat/primitives/__init__.py
@@ -0,0 +1,14 @@
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import absolute_import, division, print_function
diff --git a/cryptography/hazmat/primitives/asymmetric/__init__.py b/cryptography/hazmat/primitives/asymmetric/__init__.py
index e69de29b..2f420574 100644
--- a/cryptography/hazmat/primitives/asymmetric/__init__.py
+++ b/cryptography/hazmat/primitives/asymmetric/__init__.py
@@ -0,0 +1,14 @@
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import absolute_import, division, print_function
diff --git a/cryptography/hazmat/primitives/kdf/__init__.py b/cryptography/hazmat/primitives/kdf/__init__.py
index e69de29b..2f420574 100644
--- a/cryptography/hazmat/primitives/kdf/__init__.py
+++ b/cryptography/hazmat/primitives/kdf/__init__.py
@@ -0,0 +1,14 @@
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import absolute_import, division, print_function
diff --git a/cryptography/hazmat/primitives/kdf/hkdf.py b/cryptography/hazmat/primitives/kdf/hkdf.py
index af15b64d..1a464413 100644
--- a/cryptography/hazmat/primitives/kdf/hkdf.py
+++ b/cryptography/hazmat/primitives/kdf/hkdf.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
import six
from cryptography import utils
diff --git a/cryptography/hazmat/primitives/padding.py b/cryptography/hazmat/primitives/padding.py
index 1717262c..bf634a65 100644
--- a/cryptography/hazmat/primitives/padding.py
+++ b/cryptography/hazmat/primitives/padding.py
@@ -11,6 +11,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
import cffi
import six
diff --git a/cryptography/hazmat/primitives/twofactor/__init__.py b/cryptography/hazmat/primitives/twofactor/__init__.py
index e69de29b..2f420574 100644
--- a/cryptography/hazmat/primitives/twofactor/__init__.py
+++ b/cryptography/hazmat/primitives/twofactor/__init__.py
@@ -0,0 +1,14 @@
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import absolute_import, division, print_function