fix a memory leak and a potential UAF and also #722 (#723)

* fix a memory leak and a potential UAF and also #722

* sanity check

* bump cryptography minimum version, add changelog

1 files changed, 1 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 937d556..85252e9 100755
--- a/setup.py
+++ b/setup.py
@@ -95,7 +95,7 @@ if __name__ == "__main__":
         package_dir={"": "src"},
         install_requires=[
             # Fix cryptographyMinimum in tox.ini when changing this!
-            "cryptography>=1.9",
+            "cryptography>=2.1.4",
             "six>=1.5.2"
         ],
         extras_require={