use encryptedKey in config.json if it exists

code/decode.py

@@ -31,7 +31,17 @@ class Message:
 def get_decryption_key(path):
     with open(path) as fh:
         config = json.load(fh)
-        return config['key']
+    key = None
+    if 'key' in config and 'encryptedKey' in config:
+        raise Exception('config has both key and encryptedKey in it')
+    if 'key' in config:
+        key = 'key'
+    elif 'encryptedKey' in config:
+        key = 'encryptedKey'
+    else:
+        dict_keys = ', '.join(str(x) for x in config.keys())
+        raise Exception(f'no key found for db in config.json, only saw: {dict_keys}')
+    return config[key]
 
 
 def query_signal_db(db, key, query):