[Toybox] crc64?

[enh]

i think the world has mostly moved on to SHA already anyway, at this
level of the stack. things like CRC are just for hardware these days.
(Android recently removed a software CRC from adb.)

On Sun, Feb 4, 2018 at 7:35 PM, Rob Landley <rob at landley.net> wrote:
> On 02/04/2018 07:54 PM, Rob Landley wrote:
>> But the largest distribution in the wild seems to be the "jones" one
>> used by redis:
>>
>> https://raw.githubusercontent.com/antirez/redis/88c1d9550d198fd7df426b19ea67e9c51c92a811/src/crc64.c
>>
>> Those are also the only three listed here:
>>
>> https://users.ece.cmu.edu/~koopman/crc/crc64.html
>
> The "Jones" variant was introduced by this paper:
>
> http://www0.cs.ucl.ac.uk/staff/D.Jones/crcnote.pdf
>
> Meanwhile, the xz variant is from Appendix B of a 1992 publication the
> European Computer Manufacturers Association put out about 48 track
> magnetic tape cartriges, which seems to have been completely ignored
> until xz picked it up.
>
> http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-182.pdf
>
> Looking for more analysis on why xz chose an appendix of a 25 year old
> standard for magnetic tape storage, I found this:
>
> http://www.nongnu.org/lzip/xz_inadequate.html
>
> Which doesn't _directly_ address the issue but really doesn't give me
> confidence in xz's design decisions.
>
> (What _everybody_ seems to agree on is the ISO version is actively stupid.)
>
> Anyway, happy to have more info from somebody with actual domain
> expertise...
>
> Rob
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