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

From: Horia Geantă <[email-masked]>
Date: Fri, 23 May 2014 09:28:54 +0300

On 5/22/2014 7:03 PM, Nicolas Dichtel wrote:
> Le 22/05/2014 17:10, Horia Geanta a écrit :
>> From: Lei Xu <[email-masked]>
>>
>> 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?

Thanks,
Horia