linux-kernel - Re: [RFC ipsec-next] xfrm: make sha256 icv truncation length RFC-compliant

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Message-ID: <537F0171.5070902@6wind.com>
Date:	Fri, 23 May 2014 10:06:09 +0200
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	Horia Geantă <horia.geanta@...escale.com>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>
CC:	Lei Xu <Lei.Xu@...escale.com>,
	Sandeep Malik <Sandeep.Malik@...escale.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC ipsec-next] xfrm: make sha256 icv truncation length RFC-compliant

Le 23/05/2014 08:28, Horia Geantă a écrit :
> On 5/22/2014 7:03 PM, Nicolas Dichtel wrote:
>> Le 22/05/2014 17:10, Horia Geanta a écrit :
>>> From: Lei Xu <Lei.Xu@...escale.com>
>>>
>>> Currently the sha256 icv truncation length is set to 96bit
>>> while the length is defined as 128bit in RFC4868.
>>> This may result in somer errors when working with other IPsec devices
>>> with the standard truncation length.
>>> Thus, change the sha256 truncation length from 96bit to 128bit.
>> The patch was already proposed, but it was kept as-is for userspace
>> compatibility.
>>
>> See: https://lkml.org/lkml/2012/3/7/431
>
> Thanks, somehow I missed that.
>
> So this just means bad luck for user space tools (for e.g. ipsec-tools - setkey,
> racoon - and any other PF_KEY-based tool) that AFAICT cannot override the
> default truncated icv size, right?
You can change the default value with the netlink attribute
XFRMA_ALG_AUTH_TRUNC (option 'auth-trunc' in iproute2).


Regards,
Nicolas
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