diff --git a/cryptography/bindings/openssl/api.py b/cryptography/bindings/openssl/api.py
index 6c7462c..ab8aa3b 100644
--- a/cryptography/bindings/openssl/api.py
+++ b/cryptography/bindings/openssl/api.py
@@ -26,6 +26,7 @@
     """
     _modules = [
         "bignum",
+        "crypto",
         "evp",
         "opensslv",
     ]
diff --git a/cryptography/bindings/openssl/crypto.py b/cryptography/bindings/openssl/crypto.py
new file mode 100644
index 0000000..0f40d5b
--- /dev/null
+++ b/cryptography/bindings/openssl/crypto.py
@@ -0,0 +1,27 @@
+# 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.
+
+INCLUDES = """
+#include <openssl/crypto.h>
+"""
+
+TYPES = """
+"""
+
+FUNCTIONS = """
+void CRYPTO_free(void *);
+"""
+
+MACROS = """
+void CRYPTO_add(int *, int, int);
+"""