From: Mark Allyn <allyn@well.com>
Subject: Re: Question on __crypto_alg_lookup
Date: Fri, 27 Jan 2012 14:51:31 -0800 (PST)
Message-ID: <alpine.LRH.2.02.1201271449500.11453@well.com>
References: <alpine.LRH.2.02.1201271415230.23638@well.com>
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
To: linux-crypto@vger.kernel.org
Return-path: <linux-crypto-owner@vger.kernel.org>
Received: from newsmtp.well.com ([107.20.247.102]:57165 "EHLO newsmtp.well.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1751419Ab2A0Wvc (ORCPT <rfc822;linux-crypto@vger.kernel.org>);
	Fri, 27 Jan 2012 17:51:32 -0500
Received: from well.com (well.com [10.110.241.121])
	by newsmtp.well.com (8.14.3/8.14.3) with ESMTP id q0RMpVlE021102
	for <linux-crypto@vger.kernel.org>; Fri, 27 Jan 2012 14:51:31 -0800
In-Reply-To: <alpine.LRH.2.02.1201271415230.23638@well.com>
Sender: linux-crypto-owner@vger.kernel.org
List-ID: <linux-crypto.vger.kernel.org>


Here is a related questions that might help me . . .

Do any of you know of a ahash and ablkcipher driver that is known to have 
worked with dm-crypt? I would like to look at that code.

The drivers that I have look at so far seem to set the cra_flags the same 
as I have; I want to know if there is a driver that is known to have 
worked and look at it's cra_flags settings.

Thank you

Truly,

Mark Allyn
Portland, Oregon
www.allyn.com
971-563-7588

On Fri, 27 Jan 2012, Mark Allyn wrote:

>
> Folks:
>
> In __crypto_alg_lookup, at about line 85 of api.c, there is the following:
>
>                 if ((q->cra_flags ^ type) & mask)
>                         continue;
>
> There is no commenting on this at all.
>
> Can someone please explain what this is for and just what is this trying
> to filter?
>
> I am trying to get dm-crypt to work with a ahash device that we have.
>
> The dm-crypt is calling crypto_alloc_hash with "sha256" type 0, and mask 0x 
> 80
>
> My driver is setting these flags:
>
>                 .cra_flags              = CRYPTO_ALG_TYPE_AHASH |
>                                                 CRYPTO_ALG_ASYNC,
>
> The search seems to be failing at the above sequence in __crypto_alg_lookup.
>
> Is dm-crypt supposed to work with ahash?
>
> The Documentation/crypto does not seem to include much information
> on using the ahash and ablkcipher infrastructure.
>
> There is one document called async-tx-api.txt that seems to have no
> correlation with the ahash or ablkcipher stuff. Is it still valid?
>
> Is there another place I can look for decent documentation?
>
> Thank you
>
> Truly,
>
> Mark Allyn
> Portland, Oregon
> www.allyn.com
> 971-563-7588
> --
> To unsubscribe from this list: send the line "unsubscribe linux-crypto" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
>