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

From Jussi Kivilinna <jussi.kivilinna@iki.fi>
Newsgroups linux.kernel
Subject Re: Question about ctr mode 3des-ede IV len
Date 2016-12-08 12:20 +0100
Message-ID <sM4U2-5tG-5@gated-at.bofh.it> (permalink)
References <sLJPz-a6-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Hello,

07.12.2016, 14:43, Longpeng (Mike) kirjoitti:
> 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 ?

Because I used same tool to create test-vectors which I had previously used to create AES/Camellia/Serpent/Twofish test-vectors. So, I must have forgotten to change 16-byte IV generation to 8 bytes and thus those testcases in crypto/testmgr.h have wrong length. The extra trailing 8 bytes are not used and can be removed.

-Jussi

> 
> Thank you. :)
>

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Thread

Question about ctr mode 3des-ede IV len "Longpeng (Mike)" <longpeng2@huawei.com> - 2016-12-07 13:50 +0100
  Re: Question about ctr mode 3des-ede IV len Herbert Xu <herbert@gondor.apana.org.au> - 2016-12-08 10:10 +0100
    Re: Question about ctr mode 3des-ede IV len "Longpeng (Mike)" <longpeng2@huawei.com> - 2016-12-08 10:20 +0100
  Re: Question about ctr mode 3des-ede IV len Jussi Kivilinna <jussi.kivilinna@iki.fi> - 2016-12-08 12:20 +0100
    Re: Question about ctr mode 3des-ede IV len "Longpeng (Mike)" <longpeng2@huawei.com> - 2016-12-08 12:40 +0100

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