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Date: Thu, 21 May 2015 00:12:43 +0300
From: Aleksey Cherepanov <>
Subject: format tags and gost 2012 aka stribog

We met GOST-34.11-2012 hashes in the PHDays Hash Runner 2015. Dhiru
Kholia added 2 formats for them (stribog-256 and stribog-512) because
the hashes use different length of block and the sizes of ciphertexts
differ too.

Dhiru used $stribog$ tag and distinguished hashes between the formats
by length.

There were no split() method that adds the tag while we needed it to
make --show=types to work. So I added the split() method and also
changed tags to $stribog-256$ and $stribog-512$ . It seemed good for
the contest environment.

I am not sure what approach is the best for real environment because
both of them have pros and contras. Any suggestions?

Also name stribog seems wrong: stribog is the name of algo, but it
may be friendlier to users to call it "GOST...". The tag may follow
the name. So $gost12$ ?

What important properties should format tags exhibit in general?


Aleksey Cherepanov

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