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Re: [Caml-list] Re: Cryptokit and HMAC-SHA256
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Date: 2010-07-22 (08:37)
From: Goswin von Brederlow <goswin-v-b@w...>
Subject: Re: [Caml-list] Re: Cryptokit and HMAC-SHA256
Dario Teixeira <> writes:

> Hi,
>> If you decide to code the solution and provide the patch, I will be
>> happy to apply it to cryptokit (if the main author of cryptokit accepts
>> it, of course).
> I'm attaching the patches adding support for HMAC-SHA256 and HMAC-RIPEMD160
> (I don't need the latter, but for the sake of completeness it seemed silly
> not to support it as well).  Note that these are *very* straightforward
> patches -- kudos to Xavier for making Cryptokit so easy to extend.
> The caveat is that I'm not a cryptographer.  I did, however, verify that
> these new HMACs pass all the test cases listed in RFC4231 (for HMAC-SHA256)
> and RFC2286 (for HMAC-RIPEMD160).
> Thanks for your attention!
> Cheers,
> Dario Teixeira

While you are patching cryptokit anyway would it be possible to also add
functions to work on Bigarrays?

One huge advantage of bigarray is that the data region is allocated
outside the GC heap and will never move. That means one can use
enter_blocking_section() / leave_blocking_section() while calculating
the checksum for a block of data. For multithreaded applications that
can speed up the program by the number of cores present.