[Haskell-cafe] [ANNOUNCE] skein-0.1: Skein, a family of cryptographic hash functions. Includes Skein-MAC as well.

Vincent Hanquez tab at snarc.org
Fri Sep 23 10:32:31 CEST 2011

On 09/22/2011 02:00 AM, Felipe Almeida Lessa wrote:
> On Wed, Sep 21, 2011 at 5:19 PM, Vincent Hanquez<tab at snarc.org>  wrote:
>>> Also, it seems that cryptohash's Skein is currently broken.  The skein
>>> package comes with the "golden" KATs sent by the Skein team to the
>>> NIST, and passes everything.  OTOH, cryptohash's Skein256/Skein512 do
>>> not agree with skein's Skein_256_256/Skein_512_512.  I've attached a
>>> test suite that quickchecks if both implementations give the same
>>> answer.  My hunch is that you are using the wrong constants, because
>>> the first test case (the empty string) already fails:
>> oops darn, thanks for reporting. i'll have a look at that ASAP; It used to
>> work in the past, and i've copied some expected values from the original
>> implementation in my small unit tests (which still pass :-/ ), so i'm a bit
>> puzzle here.
> Perhaps you have implemented some old version of Skein?  I know they
> have changed the constants some times in the past.
yeah that was it. looks like 2 minor revisions were made when i wasn't looking 
(only the parity constant has change from 0x55.. to 0x19..).

Seems that everything is back in order now, but i'll make sure i put 
cryptohash's skein under the full KAT test suite in a near future.


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