linux-kernel - Re: [RFC PATCH v2 10/11] crypto: x86/aes-kl - Support AES algorithm using Key Locker instructions

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Date:   Mon, 17 May 2021 22:20:44 +0000
From:   "Bae, Chang Seok" <chang.seok.bae@...el.com>
To:     Eric Biggers <ebiggers@...nel.org>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...e.de>,
        Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v2 10/11] crypto: x86/aes-kl - Support AES algorithm
 using Key Locker instructions

On May 17, 2021, at 14:34, Eric Biggers <ebiggers@...nel.org> wrote:
> On Fri, May 14, 2021 at 01:15:07PM -0700, Chang S. Bae wrote:
>> Included are methods for ECB, CBC, CTR, and XTS modes. They are not
>> compatible with other implementations as referencing an encrypted form
>> only.
> 
> Your code uses the standard algorithm names like cbc(aes), which implies that it
> is compatible with the standard cbc(aes).  So which is it -- compatible or not
> compatible -- and if it isn't compatible, what is the expected use case?

Yes, it provides AES-CBC functionality. Well, it was intended to avoid mixed
use of functions -- setkey(), decrypt(), and encrypt() -- from others.
Perhaps, rewrite this as:

  Each method should not be used along with other implementations'. E.g., KL’s
  setkey() output can’t be used to the input to the encrypt() method of AES-NI or
  generic implementation.

Thanks,
Chang