On 13/04/10 18:16, ext Uri Simchoni wrote:
Doing step 3 using sw is probably faster than by hw (because it's short and avoid all the hw setup), so the suggested approach is probably faster than generic async hmac.
Yes. that is exactly what happens in hw - it is much slower.
And I do not see any problems as well with finishing it with sw.
On 4/13/2010 5:45 PM, Herbert Xu wrote:
On Tue, Apr 13, 2010 at 04:00:11PM +0300, Dmitry Kasatkin wrote:
I would also:
1. calc hash(opad) using sw, export
2. hash(ipad ∥ message) using hw
3. then import and finup hash from step 1 with results of step 2 (using sw)
Step 3 is the problem. If you perform step 3 in software then
there is no point in exporting a hmac(sha1) object.
We should instead add ahash support to hmac and use that.
Cheers,
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