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From: Pascal Van Leeuwen <pvanleeuwen@verimatrix.com>
To: "linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>
Cc: Eric Biggers <ebiggers@kernel.org>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	"davem@davemloft.net" <davem@davemloft.net>
Subject: AEAD question
Date: Mon, 22 Jul 2019 12:55:39 +0000
Message-ID: <MN2PR20MB29734143B4A5F5E418D55001CAC40@MN2PR20MB2973.namprd20.prod.outlook.com> (raw)

Eric & Herbert,

I noticed the testmgr fuzz tester generating (occasionally, see previous mail) tests cases with 
authsize=0 for the AEAD ciphers. I'm wondering if that is intentional. Or actually, I'm wondering
whether that should be considered a legal case.
To me, it doesn't seem to make a whole lot of sense to do *authenticated* encryption and then
effectively throw away the authentication result ... (it's just a waste of power and/or cycles)

The reason for this question is that supporting this requires some specific workaround in my 
driver (yet again). And yes, I'm aware of the fact that I can advertise I don't support zero length
authentication tags, but then probably/likely testmgr will punish me for that instead.

Regards,
Pascal van Leeuwen
Silicon IP Architect, Multi-Protocol Engines @ Verimatrix
www.insidesecure.com


             reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-22 12:55 Pascal Van Leeuwen [this message]
2019-07-22 16:22 ` Eric Biggers
2019-07-22 22:26   ` Pascal Van Leeuwen
2019-08-06  9:20     ` Pascal Van Leeuwen
2019-08-09  2:57       ` Herbert Xu
  -- strict thread matches above, loose matches on Subject: below --
2016-10-26 16:17 AEAD Question Juan Pablo Nariño Mendoza
2016-10-26 16:32 ` Stephan Mueller
2016-10-27  8:05   ` Juan Pablo Nariño Mendoza

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