phc-discussions - Re: [PHC] Bug in yescrypt pwxform specification pseudocode

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Message-ID: <alpine.DEB.2.10.1504141909210.9052@contents-vnder-pressvre.mit.edu>
Date: Tue, 14 Apr 2015 19:16:26 -0400 (EDT)
From: Ken T Takusagawa <kenta@....edu>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Bug in yescrypt pwxform specification pseudocode

On Tue, 14 Apr 2015, Solar Designer wrote:

> As to fixing this, maybe the rounds loop should go from 1 to PWXrounds
> in the spec, whereas implementations may also make it from 0 to
> PWXrounds-1 (or even use a "do ... while (--count)" loop, or an unrolled
> loop).  

Because the index variable "i" is not used within the loop, 
I think the pseudocode would be clearer if it simply said, 
"Repeat PWXrounds times:".

> The code is correct as-is, so there won't be a change to that

The pseudocode is present in the comments of the code.

--ken