Python 3 hashing requires bytes, not string

Also moved to standard lib implementation with hashlib instead of Crypto, and added UT to the problematic function

monkey/monkey_island/cc/environment/__init__.py

@@ -1,7 +1,7 @@
 from abc import ABCMeta, abstractmethod
 from datetime import timedelta
 import os
-from Crypto.Hash import SHA3_512
+import hashlib
 
 __author__ = 'itay.mizeretz'
 
@@ -45,10 +45,11 @@ class Environment(object, metaclass=ABCMeta):
     def get_auth_expiration_time(self):
         return self._AUTH_EXPIRATION_TIME
 
-    def hash_secret(self, secret):
-        h = SHA3_512.new()
-        h.update(secret)
-        return h.hexdigest()
+    @staticmethod
+    def hash_secret(secret):
+        hash_obj = hashlib.sha3_512()
+        hash_obj.update(secret.encode('utf-8'))
+        return hash_obj.hexdigest()
 
     def get_deployment(self):
         return self._get_from_config('deployment', 'unknown')

monkey/monkey_island/cc/environment/test_aws.py

@@ -0,0 +1,26 @@
+from monkey_island.cc.auth import User
+from monkey_island.cc.testing.IslandTestCase import IslandTestCase
+from monkey_island.cc.environment.aws import AwsEnvironment
+
+import hashlib
+
+
+class TestAwsEnvironment(IslandTestCase):
+    def test_get_auth_users(self):
+        env = AwsEnvironment()
+        # This is "injecting" the instance id to the env. This is the UTs aren't always executed on the same AWS machine
+        # (might not be an AWS machine at all). Perhaps it would have been more elegant to create a Mock, but not worth it for
+        # this small test.
+        env._instance_id = "i-666"
+        hash_obj = hashlib.sha3_512()
+        hash_obj.update(b"i-666")
+        auth_users = env.get_auth_users()
+        assert isinstance(auth_users, list)
+        assert len(auth_users) == 1
+        auth_user = auth_users[0]
+        assert isinstance(auth_user, User)
+        assert auth_user.id == 1
+        assert auth_user.username == "monkey"
+        assert auth_user.secret == hash_obj.hexdigest()
+
+