SIPHASH (was: Re: [GIT] Networking)

Hi Jason,

On Wed, Feb 22, 2017 at 5:31 AM, David Miller [off-list ref] wrote:

3) Introduce SIPHASH and it's usage for secure sequence numbers and
   syncookies.  From Jason A. Donenfeld.

Jason A. Donenfeld (4):
      siphash: add cryptographically secure PRF
      siphash: implement HalfSipHash1-3 for hash tables
      secure_seq: use SipHash in place of MD5
      syncookies: use SipHash in place of SHA1

bloat-o-meter v4.10.. says:

    add/remove: 338/127 grow/shrink: 604/310 up/down: 86156/-24117 (62039)
    ...
    siphash_4u64                                   -    5006   +5006
    siphash_3u64                                   -    4298   +4298
    siphash_2u64                                   -    3582   +3582
    __siphash_unaligned                            -    3052   +3052
    __siphash_aligned                              -    3052   +3052
    siphash_3u32                                   -    2976   +2976
    siphash_1u64                                   -    2870   +2870
    siphash_1u32                                   -    2172   +2172
    ...

Do we need all of this builtin, unconditionally?

Thanks for your answer!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds