encryption - libevent:为什么它依赖于 openssl？

Question

即将从源代码编译 libevent，我刚刚注意到它似乎依赖于 OpenSSL 加密 o_o。

这听起来像膨胀。

提供独立于操作系统的异步 IO 抽象的库需要加密什么？

它如何证明对 OpenSSL 的依赖也是巨大而复杂的？

libevent-2.0.21-stable/README

38 The configure script also supports the following flags:
39 
40    --enable-gcc-warnings     Enable extra compiler checking with GCC.
41    --disable-malloc-replacement
42                              Don't let applications replace our memory
43                              management functions
44    --disable-openssl         Disable support for OpenSSL encryption.
45    --disable-thread-support  Don't support multithreaded environments.

Answer 1

来自 whatsnew-2.0.txt :

5.4. SSL support for bufferevents with OpenSSL

   There is now a bufferevent type that supports SSL/TLS using the
   OpenSSL library.  The code for this is build in a separate
   library, libevent_openssl, so that your programs don't need to
   link against OpenSSL unless they actually want SSL support.

   There are two ways to construct one of these bufferevents, both
   declared in <event2/bufferevent_ssl.h>.  If you want to wrap an
   SSL layer around an existing bufferevent, you would call the
   bufferevent_openssl_filter_new() function.  If you want to do SSL
   on a socket directly, call bufferevent_openssl_socket_new().

如果您需要 SSL 套接字，这是为了您的方便。如果您不需要它，为什么不使用问题中 README 片段中的选项简单地禁用它？