I think this is a proprietary form of authentication, it's definitely hard to sift through all the Chinese documents online, but there appears to be some information for Linux and OS X.. and maybe even FreeBSD.
Searching the OpenBSD mailing list for "Ruijie" or "xrgsu" returned nothing, clearly it's not in high demand.
Here is my only contribution to this thread, is it relevant? I have no idea:
http://linux.hrbeu.edu.cn/main/node/32
http://translate.google.ca/translate...hl=en&ie=UTF-8
Hope it helps..