phc-discussions - Re: [PHC] Some Schvrch issues

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Message-ID: <CAG+Gt9breCh8674ooaMaUPk0s0+PsNa=FT1KjnC3vNGkTPmszg@mail.gmail.com>
Date: Fri, 4 Apr 2014 08:27:04 +1000
From: Rade Vuckovac <rade.vuckovac@...il.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Some Schvrch issues

Hi Daniel

It seems that parameter recommendations were not clearly stated in the
submission.
To reiterate:
password + salt + whatever < 1 Kbyte
Security is 256 bit therefore outlen is fixed to 4 meaning four u64bit
words.
Sorry if it was not clear enough.

Regards, Rade


On Thu, Apr 3, 2014 at 1:44 PM, Daniel Franke <dfoxfranke@...il.com> wrote:

> Some further issues:
>
> Lines 86 and 87 are buffer overflows if inlen + saltlen > 2048. Line 114
> is a buffer overflow if outlen > 2048. There are no checks for these
> conditions.
>
> When t_cost = m_cost = 0 and outlen = 2048, the only irreversible
> operation performed is discarding the final value of 'carry' in the
> stir() function. This makes Schvrch vulnerable to a straightforward 2^64
> preimage attack when these settings are used.
>

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