Inline comments
________________________________________
From: Denis B <begun.denis@xxxxxxxxx>
Sent: Wednesday, May 18, 2016 5:21 PM
To: Catalin Vasile
Cc: linux-crypto@xxxxxxxxxxxxxxx
Subject: Re: IV generation in cryptographic driver in AEAD
Forgive my dumbness, but in:
.cra_type = &crypto_aead_type,
.cra_u = {
.aead = {
.setkey = pp_crypto_aead_setkey,
.setauthsize = pp_crypto_aead_setauthsize,
.decrypt = pp_crypto_aead_dec,
.encrypt = pp_crypto_aead_enc,
.givencrypt = pp_crypto_aead_genivencrypt,
.givdecrypt = pp_crypto_aead_genivdecrypt,
.ivsize = AES_BLOCK_SIZE,
.maxauthsize = SHA256_DIGEST_SIZE,
},
},
Just delete the givencrypt and givdecrypt lines (or set to NULL)?
[Catalin Vasile]
You need to set it to NULL. If your struct is declared globally, the parts
that load your code will be set any uninitialized struct elements to NULL.
On Wed, May 18, 2016 at 4:56 PM, Catalin Vasile <cata.vasile@xxxxxxx> wrote:
> Inline comments.
>
> ________________________________________
> From: linux-crypto-owner@xxxxxxxxxxxxxxx <linux-crypto-owner@xxxxxxxxxxxxxxx> on behalf of Denis B <begun.denis@xxxxxxxxx>
> Sent: Wednesday, May 18, 2016 3:06 PM
> To: linux-crypto@xxxxxxxxxxxxxxx
> Subject: IV generation in cryptographic driver in AEAD
>
> Hello,
>
> In AEAD mode (or in any case, in IPSec ESP IPv4 – esp4.c), in kernel
> versions prior to 4.2 the cryptographic driver is expected to generate
> an IV.
>
> What if my driver is unable to generate an IV?
> [Catalin Vasile]
> Simple: You do not implement the givcrypt() primitive. The kernel will generate the IV in software and then call your encrypt() primitive.
>
> Thanks,
> Dennis.
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