2 files changed, 28 insertions, 12 deletions
diff --git a/cryptography/hazmat/primitives/constant_time.py b/cryptography/hazmat/primitives/constant_time.py
index e88a0d95..e0e9aa37 100644
--- a/cryptography/hazmat/primitives/constant_time.py
+++ b/cryptography/hazmat/primitives/constant_time.py
@@ -13,18 +13,20 @@
 
 from __future__ import absolute_import, division, print_function
 
+import sys
+
 import cffi
 
 import six
 
+from cryptography.hazmat.bindings.utils import _create_modulename
 
-_ffi = cffi.FFI()
-_ffi.cdef("""
+TYPES = """
 uint8_t Cryptography_constant_time_bytes_eq(uint8_t *, size_t, uint8_t *,
                                             size_t);
-""")
-_lib = _ffi.verify(
-    """
+"""
+
+FUNCTIONS = """
 uint8_t Cryptography_constant_time_bytes_eq(uint8_t *a, size_t len_a,
                                             uint8_t *b, size_t len_b) {
     size_t i = 0;
@@ -43,7 +45,13 @@ uint8_t Cryptography_constant_time_bytes_eq(uint8_t *a, size_t len_a,
     /* Now check the low bit to see if it's set */
     return (mismatch & 1) == 0;
 }
-""",
+"""
+
+_ffi = cffi.FFI()
+_ffi.cdef(TYPES)
+_lib = _ffi.verify(
+    source=FUNCTIONS,
+    modulename=_create_modulename([TYPES], FUNCTIONS, sys.version),
     ext_package="cryptography",
 )
 
diff --git a/cryptography/hazmat/primitives/padding.py b/cryptography/hazmat/primitives/padding.py
index bf634a65..d78c6a5b 100644
--- a/cryptography/hazmat/primitives/padding.py
+++ b/cryptography/hazmat/primitives/padding.py
@@ -13,20 +13,22 @@
 
 from __future__ import absolute_import, division, print_function
 
+import sys
+
 import cffi
 
 import six
 
 from cryptography import utils
+from cryptography.hazmat.bindings.utils import _create_modulename
 from cryptography.hazmat.primitives import interfaces
 
 
-_ffi = cffi.FFI()
-_ffi.cdef("""
+TYPES = """
 uint8_t Cryptography_check_pkcs7_padding(const uint8_t *, uint8_t);
-""")
-_lib = _ffi.verify(
-    """
+"""
+
+FUNCTIONS = """
 /* Returns the value of the input with the most-significant-bit copied to all
    of the bits. */
 static uint8_t Cryptography_DUPLICATE_MSB_TO_ALL(uint8_t a) {
@@ -62,7 +64,13 @@ uint8_t Cryptography_check_pkcs7_padding(const uint8_t *data,
     /* Now check the low bit to see if it's set */
     return (mismatch & 1) == 0;
 }
-""",
+"""
+
+_ffi = cffi.FFI()
+_ffi.cdef(TYPES)
+_lib = _ffi.verify(
+    source=FUNCTIONS,
+    modulename=_create_modulename([TYPES], FUNCTIONS, sys.version),
     ext_package="cryptography",
 )