Re: On-disk format of SCRAM verifiers

On 21 April 2017 16:20:56 EEST, Michael Paquier <michael(dot)paquier(at)gmail(dot)com> wrote:
>On Fri, Apr 21, 2017 at 10:02 PM, Simon Riggs <simon(at)2ndquadrant(dot)com>
>wrote:
>> On 21 April 2017 at 10:20, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>
>wrote:
>>> But looking more closely, I think I misunderstood RFC 5803. It
>*does* in
>>> fact specify a single string format to store the verifier in. And
>the format
>>> looks like:
>>>
>>> SCRAM-SHA-256$<iteration count>:<salt>$<StoredKey>:<ServerKey>
>>
>> Could you explain where you are looking? I don't see that in RFC5803
>
>From 1. Overview:

Yeah, it's not easy to see, I missed it earlier too. You have to look at RFC 5803 and RFC 3112 together. RFC 3112 says that the overall format is "<scheme>$<authInfo>$<authValue>", and RFC5803 says that for SCRAM, scheme is "SCRAM-SHA-256" (for our variant), authInfo is "<iteration count>:<salt>" and authValue is "<StoredKey>:<ServerKey>"

They really should've included examples in those RFCs.

- Heikki