[Cryptech Tech] need SHA-224 support

[Joachim Strömbergson]

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Aloha!

Looking at the API for the different hashing modes in SHA512 I thought
about following the same pattern as in that core, but that _might_ break
something.

Paul, in the SHA512 core, the two mode bits are in the CTRL-address.
Adding a mode bit (SHA256 or SHA224) would be easy. But I assume that
SHA256 will be the default. Having zero as SHA256 mode and one as SHA224
mode looks a wee bit weird. But if I choose one as default for SHA256,
would that break the expected behavior? Reading CTRL, is that really done?

Just to make sure I'm not messing anything up.

JoachimS

Joachim Strömbergson wrote:
> Aloha!
> 
> Francis Dupont wrote:
>> Today only 5 from the 6 SHA-2 algorithms are supported: there is no
>>  support for SHA-224 which is used by TSIG (cf RFC 4635) when the 
>> almost useless SHA-512/224 is supported... Can you consider this 
>> message as a formal request to add SHA-224 support?
> 
>> Thanks
> 
>> Francis.Dupont at fdupont.fr
> 
>> PS: this is trivial for the libhal mixed-mode code, a bit harder
>> for the core code but you already have SHA-384 which is pretty
>> similar.
> 
> Or more correctly, SHA224 is a truncated version of SHA256 with 
> different initial h values so the core effected would be SHA256, not 
> SHA512. Adding support for SHA224 would be fast. In the order of a 
> couple of hours including updating API and testbench.
> 
> Shall I do it? _______________________________________________ Tech
> mailing list Tech at cryptech.is 
> https://lists.cryptech.is/listinfo/tech

- -- 
Med vänlig hälsning, Yours

Joachim Strömbergson - Alltid i harmonisk svängning.
========================================================================
 Joachim Strömbergson          Secworks AB          joachim at secworks.se
========================================================================
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