希望更新SDK，增加消息体签名和加密功能支持。

[Dengguang]

公众平台安全升级，消息体签名及加密功能上线

https://mp.weixin.qq.com/cgi-bin/announce?action=getannouncement&key=1413190743&version=34&lang=zh_CN

[c9n]

#todo#

[MewX]

It's just easy to add this function, I tried it on TextResponse.
https://github.com/MewX/wechat-php-sdk