replace PyCrypto usage w/ crytography; ansible no longer bundles it

see: https://github.com/ansible/ansible-tower/issues/7395

awx/conf/migrations/_reencrypt.py

@@ -3,7 +3,11 @@ import hashlib
 
 import six
 from django.utils.encoding import smart_str
-from Crypto.Cipher import AES
+
+from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.primitives.ciphers import Cipher
+from cryptography.hazmat.primitives.ciphers.algorithms import AES
+from cryptography.hazmat.primitives.ciphers.modes import ECB
 
 from awx.conf import settings_registry
 
@@ -52,8 +56,8 @@ def decrypt_value(encryption_key, value):
     if algo != 'AES':
         raise ValueError('unsupported algorithm: %s' % algo)
     encrypted = base64.b64decode(b64data)
-    cipher = AES.new(encryption_key, AES.MODE_ECB)
-    value = cipher.decrypt(encrypted)
+    decryptor = Cipher(AES(encryption_key), ECB(), default_backend()).decryptor()
+    value = decryptor.update(encrypted) + decryptor.finalize()
     value = value.rstrip('\x00')
     # If the encrypted string contained a UTF8 marker, decode the data
     if utf8:
@@ -90,10 +94,11 @@ def encrypt_field(instance, field_name, ask=False, subfield=None, skip_utf8=Fals
         utf8 = type(value) == six.text_type
     value = smart_str(value)
     key = get_encryption_key(field_name, getattr(instance, 'pk', None))
-    cipher = AES.new(key, AES.MODE_ECB)
-    while len(value) % cipher.block_size != 0:
+    encryptor = Cipher(AES(key), ECB(), default_backend()).encryptor()
+    block_size = 16
+    while len(value) % block_size != 0:
         value += '\x00'
-    encrypted = cipher.encrypt(value)
+    encrypted = encryptor.update(value) + encryptor.finalize()
     b64data = base64.b64encode(encrypted)
     tokens = ['$encrypted', 'AES', b64data]
     if utf8:

awx/main/tests/unit/isolated/test_expect.py

@@ -9,8 +9,9 @@ import tempfile
 import time
 from collections import OrderedDict
 
-from Crypto.PublicKey import RSA
-from Crypto import Random
+from cryptography.hazmat.primitives.asymmetric import rsa
+from cryptography.hazmat.backends import default_backend
+from cryptography.hazmat.primitives import serialization
 
 from awx.main.isolated import run, isolated_manager
 
@@ -22,8 +23,19 @@ HERE, FILENAME = os.path.split(__file__)
 @pytest.fixture(scope='function')
 def rsa_key(request):
     passphrase = 'passme'
-    key = RSA.generate(1024, Random.new().read)
-    return (key.exportKey('PEM', passphrase, pkcs=1), passphrase)
+    key = rsa.generate_private_key(
+        public_exponent=65537,
+        key_size=1024,
+        backend=default_backend()
+    )
+    return (
+        key.private_bytes(
+            encoding=serialization.Encoding.PEM,
+            format=serialization.PrivateFormat.TraditionalOpenSSL,
+            encryption_algorithm=serialization.BestAvailableEncryption(passphrase)
+        ),
+        passphrase
+    )
 
 
 @pytest.fixture(scope='function')

tox.ini

@@ -11,8 +11,6 @@ envlist =
 basepython = python2.7
 setenv =
     DJANGO_SETTINGS_MODULE = awx.settings.development_quiet
-    # For OS X to be able to install pycrypto.
-    # CFLAGS = -I/opt/local/include
     SWIG_FEATURES = -cpperraswarn -includeall -I/usr/include/openssl
     HOME = {homedir}
     USERPROFILE = {homedir}