Prefer pure-python crypto if using Python 3

1 files changed, 2 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index f747ad0..431775d 100755
--- a/setup.py
+++ b/setup.py
@@ -60,7 +60,8 @@ setup(
         "coverage>=4.1,<5",
     ],
     install_requires=[
-        "cryptography>=2,<3",
+        'cryptography>=2,<3;python_version<"3.4"',
+        'blowfish<1.0;python_version>="3.4"',
         "requests>=2,<3",
     ],
     entry_points={