近期由于公司项目的需要开始研究国密SM2加密.网上也找了许久没有,可是没有关于iOS方面的实现,有很多基于openssl的C语言的实现,但是因为是C的小白,而且代码较乱,也没注释,被坑了不少的下载积分.后来找到GmSSL有实现sm2.实现过程中遇到了各种的坑,同时也有其他小伙伴有这方面的需求,所以把我的实现过程分享一下.(Recently due to the start of the project of state secret SM2 encryption. Internet is also looking for a long time, but not on the iOS, there are a lot of implementation of OpenSSL based on C language, but because C is white, and the code is a mess, no comments, hang a lot of download points later found. GmSSL implementation of sm2. encountered various pits, there are also other buddy needs in this area, so the realization of my share.)