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Date: Tue, 23 Jan 2024 22:50:15 +0100
From: Solar Designer <>
Subject: Re: "No hashes found" when argon2id is present?

On Thu, Jun 01, 2023 at 08:56:00PM +0200, Solar Designer wrote:
> On Thu, Jun 01, 2023 at 12:51:36PM -0400, Thomas Ward wrote:
> > I have a file with an `argon2id` hash in it, specifically this one (this 
> > is a test hash with 'Passw0rd' as the password, not an actual password) 
> > generated from the PyPI `argon2-cffi` library:
> > 
> > $argon2id$v=19$m=65536,t=4,p=2$w6DmOoIk0tVKDoXEeaYE0ZB9KqZ6Uw$zO3D4nlA9JAS6j/tZGXT0NY0ZzRIPPYLBogo2ObLiLY
> > 
> > When I try and pass this file to john, it says "no hashes found".  Is 
> > john incapable of processing argon2id hashes?
> That's correct.  We need to update the Argon2 implementation as part of
> this issue:

We still haven't updated the CPU implementation to latest upstream, but
we now have Argon2 implemented in OpenCL for GPUs, including the 2id
flavor.  Here's how your sample hash above gets cracked:

$ ./john -dev=4 pw-argon2id
Device 4: GeForce GTX 1080
Using default input encoding: UTF-8
Loaded 1 password hash (argon2-opencl [Blake2 OpenCL])
Cost 1 (t) is 4 for all loaded hashes
Cost 2 (m) is 65536 for all loaded hashes
Cost 3 (p) is 2 for all loaded hashes
Cost 4 (type [0:Argon2d 1:Argon2i 2:Argon2id]) is 2 for all loaded hashes
Trying to compute 120 hashes at a time using 7680 of 8119 MiB device memory
LWS=[32-64] GWS=[7680-7680] ([120-240] blocks) => Mode: WARP_SHUFFLE
Proceeding with single, rules:Single
Press 'q' or Ctrl-C to abort, 'h' for help, almost any other key for status
Almost done: Processing the remaining buffered candidate passwords, if any.
Proceeding with wordlist:./password.lst
Enabling duplicate candidate password suppressor
Passw0rd         (?)     
1g 0:00:00:13 DONE 2/3 (2024-01-23 22:42) 0.07424g/s 302.9p/s 302.9c/s 302.9C/s Dev#4:49C greenday1..courtney1

This works on NVIDIA and AMD GPUs (NVIDIA preferred, as on AMD we're
limited to 4 GiB max allocation).  It does not fully work on Intel GPUs,
and not at all on CPUs.  We do still need to also update the CPU format,
but meanwhile I thought I'd post this interim update to this thread.


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