Re: [PATCH 0/3] AF_ALG interface for akcipher

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On 7/22/2015 7:19 AM, Tadeusz Struk wrote:
> On 07/21/2015 06:32 PM, Herbert Xu wrote:
>> I think we should finish the conversion of the only in-kernel
>> user of RSA before we add the user-space interface.  Otherwise
>> this unnecessarily ties our hands to the current API.
>>
>> For example, do we want an SG interface for the input and output?
>> As it stands even if a hardware device came with SG support we
>> would not be able to use it.
>>
>> Tadeusz, can you confirm again that qat does not support SG with
>> respect to RSA input and output?
> 
> No, it doesn't. Even if we would add SG support on the API it will
> need to be copied into contiguous buffers before it is sent to the HW.

OTOH, caam has SG support for all PK operations, including rsa-encrypt,
rsa-decrypt primitives.
We are working at upstreaming - aligning our internal caam-pkc with
akcipher.

Please consider designing a flexible AF_ALG interface, as Stephan suggested.

Thanks,
Horia

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