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Date: Mon, 28 Sep 2015 13:50:25 +0200
From: Dmitry Khovratovich <>
To: "" <>
Subject: Re: [PHC] Specification of a modular crypt format

On Sun, Sep 27, 2015 at 11:20 PM, Alexander Cherepanov <
> wrote:

> Hm, there seems to be some indeterminism in Argon2 itself here? According
> to spec: "The actual number of blocks is $m'$, which is $m$ rounded down to
> the nearest multiple of $4p$."

 To ease the hashing process, Argon2 allocates the same amount of memory
for each thread. Therefore, when you request 9 or 10 KB of memory and 2
threads, 8 KBytes will be used in fact. The output values will be
different, of course, as the requested 'm' is hashed as well.

Best regards,
Dmitry Khovratovich

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