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Message-ID: <CAOy4Vzd8pTk4H7dYm70mu=bKXQQ8m5zVHuT6+XMH858-gG3_QQ@mail.gmail.com>
Date: Fri, 3 Feb 2017 08:20:31 -0800
From: David Tomaschik <david@...temoverlord.com>
To: john-users@...ts.openwall.com
Subject: Dynamic Hashes and SaltLen
Using the latest bleeding-jumbo, if I define a dynamic format like this:
[List.Generic:dynamic_1600]
Expression=md5($p.$u)
Flag=MGF_USERNAME
Func=DynamicFunc__clean_input
Func=DynamicFunc__append_keys
Func=DynamicFunc__append_userid
Func=DynamicFunc__crypt_md5
Test=$dynamic_1600$7f409a7c046daea1c2c60502d7e2becc:pass:user
I get an error:
Error invalid format dynamic_1600
It is required to add SaltLen= to the script, for this format
This appears to be because MGF_USERNAME implies MGF_SALTED (undocumented
unless you read the source) and the test here:
https://github.com/magnumripper/JohnTheRipper/blob/bleeding-jumbo/src/dynamic_fmt.c#L7867
.
Since this format has no salt (as I understand the term salt, but it
appears MGF_SALTED means "the hash depends on a per-hash input") what is
the appropriate value for SaltLen? -1?
What practical impact does SaltLen have in this case? The documentation
seems to indicate it's used only to verify hashes when reading the input
file.
David
--
David Tomaschik
OpenPGP: 0x5DEA789B
https://systemoverlord.com
david@...temoverlord.com
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