I loaded up the Xcode project for Security.framework and it complained about disabled compiler warnings.
I also noticed their open-source download page [1] doesn't force you to https by default, which probably matters to anyone looking at Security.framework to fix SSL MITM problems :)
Doesn't look like they make their frameworks easy to compile for outsiders. The only corecrypto headers I can find are in XNU, and they appear to be outdated.
I'm hand-constructing what I can from context. Here are the defines from ccasn1.h: https://bochs.info/p/6jquf
You need these too:
typedef int ccoid_t;
extern size_t ccder_sizeof_raw_octet_string(signed long length);