check cipher before daemon start

fix #280

shadowsocks/local.py

@@ -30,8 +30,7 @@ import logging
 import signal
 
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), '../'))
-from shadowsocks import utils, daemon, encrypt, eventloop, tcprelay, udprelay,\
-    asyncdns
+from shadowsocks import utils, daemon, eventloop, tcprelay, udprelay, asyncdns
 
 
 def main():
@@ -49,8 +48,6 @@ def main():
 
     utils.print_shadowsocks()
 
-    encrypt.try_cipher(config['password'], config['method'])
-
     try:
         logging.info("starting local at %s:%d" %
                      (config['local_address'], config['local_port']))

shadowsocks/server.py

@@ -30,8 +30,7 @@ import logging
 import signal
 
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), '../'))
-from shadowsocks import utils, daemon, encrypt, eventloop, tcprelay, udprelay,\
-    asyncdns
+from shadowsocks import utils, daemon, eventloop, tcprelay, udprelay, asyncdns
 
 
 def main():
@@ -57,7 +56,6 @@ def main():
         else:
             config['port_password'][str(server_port)] = config['password']
 
-    encrypt.try_cipher(config['password'], config['method'])
     tcp_servers = []
     udp_servers = []
     dns_resolver = asyncdns.DNSResolver()

shadowsocks/utils.py

@@ -30,6 +30,7 @@ import sys
 import getopt
 import logging
 from shadowsocks.common import to_bytes, to_str, IPNetwork
+from shadowsocks import encrypt
 
 
 VERBOSE_LEVEL = 5
@@ -95,6 +96,8 @@ def check_config(config):
             logging.error('user can be used only on Unix')
             sys.exit(1)
 
+    encrypt.try_cipher(config['password'], config['method'])
+
 
 def get_config(is_local):
     logging.basicConfig(level=logging.INFO,