http://www.rfc-editor.org/rfc/rfc2367.txt
RFC 2367: PF_KEY Key Management API, Version 2, D. McDonald, C. Metz, B. Phan1998-07-01T23:00:00-00:00A generic key management API that can be used not only for IP Security but also for other network security services is presented in this document. This memo provides information for the Internet community. It does not specify an Internet standard of any kind.