在将openssl升级到1.1.0以上版本后，Shadowsocks 2.8.2 启动时会报undefined symbol: EVP_CIPHER_CTX_cleanup错误，如下：

INFO: loading config from ss.json 
2016-12-14 22:47:50 INFO loading libcrypto from libcrypto.so.1.1 
Traceback (most recent call last): 
File “/usr/local/bin/sslocal”, line 11, in 
sys.exit(main()) 
File “/usr/local/lib/python2.7/dist-packages/shadowsocks/local.py”, line 39, in main 
config = shell.get_config(True) 
File “/usr/local/lib/python2.7/dist-packages/shadowsocks/shell.py”, line 262, in get_config 
check_config(config, is_local) 
File “/usr/local/lib/python2.7/dist-packages/shadowsocks/shell.py”, line 124, in check_config 
encrypt.try_cipher(config[‘password’], config[‘method’]) 
File “/usr/local/lib/python2.7/dist-packages/shadowsocks/encrypt.py”, line 44, in try_cipher 
Encryptor(key, method) 
File “/usr/local/lib/python2.7/dist-packages/shadowsocks/encrypt.py”, line 83, in init 
random_string(self._method_info[1])) 
File “/usr/local/lib/python2.7/dist-packages/shadowsocks/encrypt.py”, line 109, in get_cipher 
return m[2](method, key, iv, op) 
File “/usr/local/lib/python2.7/dist-packages/shadowsocks/crypto/openssl.py”, line 76, in init 
load_openssl() 
File “/usr/local/lib/python2.7/dist-packages/shadowsocks/crypto/openssl.py”, line 52, in load_openssl 
libcrypto.EVP_CIPHER_CTX_cleanup.argtypes = (c_void_p,) 
File “/usr/lib/python2.7/ctypes/init.py”, line 375, in getattr 
func = self.getitem(name) 
File “/usr/lib/python2.7/ctypes/init.py”, line 380, in getitem 
func = self._FuncPtr((name_or_ordinal, self)) 
AttributeError: /usr/lib/x86_64-Linux-gnu/libcrypto.so.1.1: undefined symbol: EVP_CIPHER_CTX_cleanup

解决方法：

1. vi /usr/local/lib/python2.7/dist-packages/shadowsocks/crypto/openssl.py
   将第52行 libcrypto.EVP_CIPHER_CTX_cleanup.argtypes = (c_void_p,)
   改为 libcrypto.EVP_CIPHER_CTX_reset.argtypes = (c_void_p,)
   并将第111行 libcrypto.EVP_CIPHER_CTX_cleanup(self._ctx)
   改为 libcrypto.EVP_CIPHER_CTX_reset(self._ctx)
   存盘退出
2. 重新启动Shadowsocks。

参考：