add comment about buf

10 years ago · 402bc5743b
1 changed files with 1 additions and 0 deletions
--- 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):