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Date: Mon, 10 Nov 2014 16:13:18 +0100
From: Sascha Schmidt <>
Subject: Re: [PHC] Another PHC candidates "mechanical" tests


>- I tried to visualize real used memory (measured by rusage()) and
>run time with variable mcost/tcost (and generate some fancy graphs:-)

Judging from our graphs you might have confused the instances of
Catena. Catena-DBG should require about 1.5 times the size of
Catena-BRG and it does so in our tests. Also Catena and Catena-BRG
should be absolutely equal in all categories.

>>  - Catena/Catena2 implementations allows to produce hash of length >256 bytes, which is apparently wrong
> The output length of Catena is limited to the output length of
> underlying hash function. Hence, for Blake2b and SHA512 the max output
> length is 64-byte.
We actually made a small mistake there. The fix is already on my
github repository and should be merged into the main one soon.

Sascha Schmidt
Catena Code Monkey

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