I haven't been actively watching SipHash but I do subscribe to the linux-hardening list and have seen a little bit of the discussion - my understanding is there

I haven't been actively watching SipHash but I do subscribe to the linux-hardening list and have seen a little bit of the discussion - my understanding is there are a bunch of potential applications in the kernel in areas that already use other hash functions, such as TCP sequence numbers, which are security sensitive, where SipHash could be faster and/or more secure. Hash functions aren't included in the kernel for exposure to userspace, they're included for internal kernel use. edit: see e.g. this email from Linus: http://www.openwall.com/lists/kernel-hardening/2016/12/13/5 http://www.openwall.com/lists/kernel-hardening/2016/12/13/5