Re: CRC was: Re: beta testing version

Horst Herb wrote:
>
> > This may be implemented very fast (if someone points me where
> > I can find CRC func). And I could implement "physical log"
> > till next monday.
>
> I have been experimenting with CRCs for the past 6 month in our database for
> internal logging purposes. Downloaded a lot of hash libraries, tried
> different algorithms, and implemented a few myself. Which algorithm do you
> want? Have a look at the openssl libraries (www.openssl.org) for a start -if
> you don't find what you want let me know.
>
> As the logging might include large data blocks, especially now that we can
> TOAST our data, I would strongly suggest to use strong hashes like RIPEMD or
> MD5 instead of CRC-32 and the like. Sure, it takes more time tocalculate and
> more place on the hard disk, but then: a database without data integrity
> (and means of _proofing_ integrity) is pretty worthless.

The choice of hash algoritm could be made a compile-time switch quite
easyly I guess.

---------
Hannu