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Cryptokit and HMAC-SHA256
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Date: 2010-07-21 (18:12)
From: Sylvain Le Gall <sylvain@l...>
Subject: Re: Cryptokit and HMAC-SHA256
On 21-07-2010, Dario Teixeira <darioteixeira@yahoo.com> wrote:
> Hi,
> I need a keyed hash function (HMAC) based on SHA256.  I looked at Cryptokit's
> support for HMAC, and though it has built-in support for HMAC-MD5 and HMAC-SHA1,
> it seems HMAC-SHA256 is not directly supported, despite Cryptokit implementing
> the SHA256 algorithm.
> While RFC 2104 seems straightforward enough and there's always the option
> of adapting Cryptokit's HMAC-SHA1 code, I wonder if someone else out there
> either a) has already done this, or b) knows of an alternative library
> implementing HMAC-SHA256.

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).

Sylvain Le Gall