5.7.6 fix seley bug.

Author: Michael-X-Net

code/default/x_tunnel/local/seley_front/rc4_wrap.py

@@ -3,7 +3,11 @@
 import struct
 import json
 
-from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
+try:
+    from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
+except:
+    algorithms = None
+
 
 import utils
 
@@ -21,6 +25,9 @@ def __init__(self, sock, ip_str=None, sni=None, on_close=None):
         self.running = True
         self.h2 = False
 
+        if not algorithms:
+            raise socket.error('no cryptography')
+
         algorithm = algorithms.AES(self.sni)
         iv = b'\x00' * 16
         self.cipher = Cipher(algorithm, mode=modes.CFB(iv))