Merge pull request #2120 from letsencrypt/cryptography_fix

Don't use cryptography version 1.2

acme/setup.py

@@ -9,7 +9,7 @@ version = '0.2.0.dev0'
 install_requires = [
     # load_pem_private/public_key (>=0.6)
     # rsa_recover_prime_factors (>=0.8)
-    'cryptography>=0.8',
+    'cryptography>=0.8,<1.2',
     # Connection.set_tlsext_host_name (>=0.13), X509Req.get_extensions (>=0.15)
     'PyOpenSSL>=0.15',
     'pyrfc3339',

setup.py

@@ -33,7 +33,7 @@ version = meta['version']
 install_requires = [
     'acme=={0}'.format(version),
     'configobj',
-    'cryptography>=0.7',  # load_pem_x509_certificate
+    'cryptography>=0.7,<1.2',  # load_pem_x509_certificate
     'parsedatetime',
     'psutil>=2.1.0',  # net_connections introduced in 2.1.0
     'PyOpenSSL',