linux-kernel - Re: Question about ctr mode 3des-ede IV len

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Date:   Thu, 8 Dec 2016 17:12:45 +0800
From:   "Longpeng (Mike)" <longpeng2@...wei.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
CC:     <jussi.kivilinna@....fi>, <jussi.kivilinna@...tian.com>,
        Gonglei <arei.gonglei@...wei.com>,
        "Zhoujian (jay, Euler)" <jianjay.zhou@...wei.com>,
        "Wubin (H)" <wu.wubin@...wei.com>, <linux-kernel@...r.kernel.org>
Subject: Re: Question about ctr mode 3des-ede IV len



On 2016/12/8 17:04, Herbert Xu wrote:

> On Wed, Dec 07, 2016 at 08:43:16PM +0800, Longpeng (Mike) wrote:
>> Hi Jussi and Herbert,
>>
>> I saw serveral des3-ede testcases(in crypto/testmgr.h) has 16-bytes IV, and the
>> libgcrypt/nettle/RFC1851 said the IV-len is 8-bytes.
>>
>> Would you please tell me why these testcases has 16-bytes IV ?
> 
> I think they were automatically generated.  Only the first eight
> bytes are actually used so the IV size is still 8.
> 
> Cheers,


Cool, thank you very much! :)

-- 
Regards,
Longpeng(Mike)