On Sat, 6 May 2000, Bruce Momjian wrote:
> > We can do it with MD5. Sverre has offered up a java version of it
> > that he wrote, I can convert it to C and make sure it at least runs
> > on FreeBSD, IRIX, DOS/Windows, and HPUX 8-10. If it runs in unix then
> > it should also run in OS/2. If we roll our own we should be safe. I
> > can even include a simple test to make sure it works for all platforms
> > we support.
>
> Yes, I seem to remember that was the issue. If we only did crypting on
> the server, and allowed passwords to come cleartext from clients, then
> we only needed crypting on the server. If we crypt in a one-way fashion
> on the client before coming to the server using a random salt, we have
> to do the other part of the crypting on the client too.
>
> In other words, it is the one-way nature of the password crypt we used
> on the client that caused us to need the _exact_ same input string to
> go into that crypt on the client and server, so we would need the same
> crypt process in both places.
>
> Now, let me ask another, better question:
>
> Right now the password receives a random salt from the server, it uses
> that salt to crypt the password, then send that back for comparison with
> the clear-text password we store in the system.
>
> What if we:
> store the password in pg_shadow like a unix-style password with salt
> pass the random salt and the salt from pg_shadow to the client
> client crypts the password twice through the routine:
> once using the pg_shadow salt
> another time using the random salt
>
> and passes that back to the server. The server can use the pg_shadow
> copy of the password, use the random salt make a new version, and
> compare the result.
>
> This has the huge advantage of not requiring any new crypting methods on
> the client. It only requires the crypt to happen twice using two
> different salts.
>
> Sounds like a winner. Comments?
Overlycomplicated?
What was your objection to MD5 again?
Vince.
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