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

23 Sep 2011


      On 09/22/2011 02:00 AM, Felipe Almeida Lessa wrote:
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On Wed, Sep 21, 2011 at 5:19 PM, Vincent Hanquez  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.

Thanks,
-- 
Vincent