lkml.org 
[lkml]   [2016]   [Jun]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH v6 3/6] crypto: AF_ALG -- add asymmetric cipher interface
Date
Am Mittwoch, 22. Juni 2016, 15:45:38 schrieb Mat Martineau:

Hi Mat,

> >
> > Ok, I'll update the patch.
>
> Thanks, that helps (especially with pkcs1pad).

Tadeusz received the updated patch from me to integrate it into his patch set.
>
> This brings me to another proposal for read buffer sizing: AF_ALG akcipher
> can guarantee that partial reads (where the read buffer is shorter than
> the output of the crypto op) will work using the same semantics as
> SOCK_DGRAM/SOCK_SEQPACKET. With those sockets, as much data as will fit is
> copied in to the read buffer and the remainder is discarded.
>
> I realize there's a performance and memory tradeoff, since the crypto
> algorithm needs a sufficiently large output buffer that would have to be
> created by AF_ALG akcipher. The user could manage that tradeoff by
> providing a larger buffer (typically key_size?) if it wants to avoid
> allocating and copying intermediate buffers inside the kernel.

How shall the user know that something got truncated or that the kernel
created memory?

Ciao
Stephan

\
 
 \ /
  Last update: 2016-06-23 07:41    [W:0.088 / U:0.152 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site