Re: [PATCH 0/2] crypto: omap-sha1-md5: OMAP3 SHA1 & MD5 driver

[Dmitry Kasatkin <dmitry.kasatkin@nokia.com>]

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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