Re: SCRAM salt length

Simon Riggs <simon@2ndquadrant.com>

From: Simon Riggs <simon@2ndquadrant.com>
To: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2017-08-17T07:41:54Z
Lists: pgsql-hackers
On 16 August 2017 at 14:10, Peter Eisentraut
<peter.eisentraut@2ndquadrant.com> wrote:
> The SCRAM salt length is currently set as
>
> /* length of salt when generating new verifiers */
> #define SCRAM_DEFAULT_SALT_LEN     12
>
> without further comment.
>
> I suspect that this length was chosen based on the example in RFC 5802
> (SCRAM-SHA-1) section 5.  But the analogous example in RFC 7677
> (SCRAM-SHA-256) section 3 uses a length of 16.  Should we use that instead?

16 preferred, IMHO

-- 
Simon Riggs                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services


Commits

  1. Increase SCRAM salt length

  2. Make SCRAM salts and nonces longer.