lkml.org 
[lkml]   [2016]   [Jun]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v6 3/6] crypto: AF_ALG -- add asymmetric cipher interface

On Thu, 9 Jun 2016, Stephan Mueller wrote:

> Am Donnerstag, 9. Juni 2016, 11:18:04 schrieb Mat Martineau:
>
> Hi Mat,
>
>>> Or is your concern that the user space interface restricts things too much
>>> and thus prevents a valid use case?
>>
>> The latter - my primary concern is the constraint this places on userspace
>> by forcing larger buffer sizes than might be necessary for the operation.
>> struct akcipher_request has separate members for src_len and dst_len, and
>> dst_len is documented as needing "to be at least as big as the expected
>> result depending on the operation". Not the maximum result, the expected
>> result. It's also documented that the cipher will generate an error if
>> dst_len is insufficient and update the value with the required size.
>>
>> I'm updating some userspace TLS code that worked with an earlier, unmerged
>> patch set for AF_ALG akcipher (from last year). The read calls with
>> shorter buffers were the main porting problem.
>
> I see -- are you proposing to drop that check entirely?

Yes.


Best regards,

--
Mat Martineau
Intel OTC

\
 
 \ /
  Last update: 2016-06-09 21:01    [W:0.087 / U:1.248 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site