Use pycryptodome, allowing the use of pycrypto on GAE

requirements.txt

@@ -1,3 +1,3 @@
-pycrypto
+pycryptodome
 six
 future

setup.py

@@ -4,8 +4,6 @@
 
 import jose
 
-import platform
-
 from setuptools import setup
 
 
@@ -24,11 +22,26 @@ def get_packages(package):
     ]
 
 
+def on_google_appengine():
+    """
+    Check if running on google appengine.
+    Will also return True on the GAE testbed.
+    """
+    try:
+        from google import appengine
+        # satisfy pyflakes, but if this is falsey, that's weird...
+        if appengine:
+            return True
+    except ImportError:
+        pass
+    return False
+
+
 def get_install_requires():
-    if platform.python_implementation() == 'PyPy':
-        crypto_lib = 'pycryptodome >=3.3.1, <3.4.0'
-    else:
+    crypto_lib = 'pycryptodome >=3.3.1, <3.4.0'
+    if on_google_appengine():
         crypto_lib = 'pycrypto >=2.6.0, <2.7.0'
+
     return [
         crypto_lib,
         'six <2.0',

tox.ini

@@ -6,7 +6,7 @@ commands =
     py.test --cov-report term-missing --cov jose
 deps =
     future
-    pycrypto
+    pycryptodome
     ecdsa
     pytest
     pytest-cov