Re: [PATCH] tcrypt: add self test for des3_ebe cipher operating in cbc mode

[Adrian-Ken Rueegsegger <rueegsegger@swiss-it.ch>]

Adrian-Ken Rueegsegger wrote:
> Neil Horman wrote:
>> On Sat, May 31, 2008 at 08:46:22AM +1000, Herbert Xu wrote:
>>> On Fri, May 30, 2008 at 07:26:38PM +0200, Adrian-Ken Rüegsegger wrote:
>>>> I was wondering why you created your own test vectors. Wouldn't standardized test vectors by NIST or ANSI be preferable?
>>> If you could post a patch with those that would be very much
>>> appreciated.  Thanks!
> 
> I am putting together a patch using the test vectors found at [3] and the ones I gathered from ANSI X9.52 and ISO/IEC FDIS 10116:2005. Strange enough the ANSI and ISO test vectors pass while the ones from NIST do not yield the expected results. I have not yet identified the specific differences between the various test vector sets. It is not clearly stated if/which padding was employed so that might be the reason...

The reason for getting different results with test vectors from [3] is, that one must repeatedly
apply the encryption/decryption 10000 times eventhough it's not clearly specified in that document
itself. The Monte Carlo test that has to be used to get the results is described in [2]
(section 3.2, page 24).

Adrian
 
>> For future reference, do you have a link where NIST standard test vectors can be
>> obtained?
> 
> A good place to start is [1]. More specifically for TDES: [2] and [3]. Note that the tests described in [2] will not work with the current DES3 implementation since the employed keys will be identified as weak keys and the setkey operation would fail.
> 
> By the way: when explicitly trying to set a weak key for DES3 I got the following warning:
> 
> setkey() failed flags=0
> 
> Shouldn't the flags be set to CRYPTO_TFM_RES_BAD_KEY_SCHED at that point (see crypto/des_generic.c, line 873)?
> 
> Thanks,
> Adrian
> __________
> 
> [1] - http://csrc.nist.gov/groups/STM/cavp/standards.html
> [2] - http://csrc.nist.gov/publications/nistpubs/800-20/800-20.pdf
> [3] - http://csrc.nist.gov/groups/STM/cavp/documents/des/tripledes-vectors.zip
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