From 402bc5743be6ab1420cabe418d26ec46ebbf563d Mon Sep 17 00:00:00 2001
From: clowwindy <clowwindy42@gmail.com>
Date: Wed, 17 Sep 2014 00:11:50 +0800
Subject: [PATCH] add comment about buf

---
 shadowsocks/crypto/ctypes_openssl.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/shadowsocks/crypto/ctypes_openssl.py b/shadowsocks/crypto/ctypes_openssl.py
index b688765..88d9392 100644
--- a/shadowsocks/crypto/ctypes_openssl.py
+++ b/shadowsocks/crypto/ctypes_openssl.py
@@ -91,6 +91,7 @@ class CtypesCrypto(object):
         libcrypto.EVP_CipherUpdate(self._ctx, byref(buf),
                                    byref(cipher_out_len), c_char_p(data),
                                    len(data))
+        # buf is copied to a str object when we access buf.raw
         return buf.raw[:cipher_out_len.value]
 
     def __del__(self):