[dpdk-dev] [RFC] cryptodev/sym: GCM IV len != 12 byte case
Liron Himi
lironh at marvell.com
Wed Mar 20 19:50:54 CET 2019
+ Michael
From: Kusztal, ArkadiuszX <arkadiuszx.kusztal at intel.com>
Sent: Wednesday, March 20, 2019 20:47
To: dev at dpdk.org; Trahe, Fiona <fiona.trahe at intel.com>; Doherty, Declan <declan.doherty at intel.com>; De Lara Guarch, Pablo <pablo.de.lara.guarch at intel.com>; akhil.goyal at nxp.com; ravi1.kumar at amd.com; tdu at semihalf.com; Liron Himi <lironh at marvell.com>; Alan Winkowski <walan at marvell.com>
Subject: [EXT] [RFC] cryptodev/sym: GCM IV len != 12 byte case
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Hi all,
There is a proposition to amend a bit API due to the following lines:
* - For GCM mode, this is either 12 (for 96-bit IVs)
* or 16, in which case data points to J0.
...
} iv; /**< Initialisation vector parameters */
Problem arise when driver cannot support J0 input, right now we know that OPENSSL PMD works with IV instead of J0 when iv_len != 12.
So it may be that we have to somehow support both. There are two options, and I am very curious about community opinion.
1. Add a flag to aead_xform.iv to supports IV or J0 like this:
uint8_t IV_used;
And this could be reflected in capabilities. Of course for 96bits IV this field would not be used, so it would had to be set only for iv.length != 12
1. Change API comments to something like:
* - For GCM mode, this is either 12 (for 96-bit IVs),
* - for IV length different than 96 bits it is or J0 or IV,
* - refer to specific driver rst or capabilities which one
* - is supported, etc. (J0 by definition is of 16 bytes len)
I cc'ing maintainers of drivers that support iv_len != 16 bytes.
Cannot check how it works as I have no hw.
Regards,
Arek
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