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From: Eric Biggers <ebiggers@kernel.org>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Ard Biesheuvel <ardb@kernel.org>,
	Stephan Mueller <smueller@chronox.de>,
	Linux Crypto Mailing List <linux-crypto@vger.kernel.org>
Subject: Re: [v3 PATCH 1/31] crypto: skcipher - Add final chunk size field for chaining
Date: Tue, 28 Jul 2020 10:15:12 -0700	[thread overview]
Message-ID: <20200728171512.GB4053562@gmail.com> (raw)
In-Reply-To: <E1k0Jsl-0006Ho-Gf@fornost.hmeau.com>

On Tue, Jul 28, 2020 at 05:18:39PM +1000, Herbert Xu wrote:
> Crypto skcipher algorithms in general allow chaining to break
> large operations into smaller ones based on multiples of the chunk
> size.  However, some algorithms don't support chaining while others
> (such as cts) only support chaining for the leading blocks.
> 
> This patch adds the necessary API support for these algorithms.  In
> particular, a new request flag CRYPTO_TFM_REQ_MORE is added to allow
> chaining for algorithms such as cts that cannot otherwise be chained.
> 
> A new algorithm attribute final_chunksize has also been added to
> indicate how many blocks at the end of a request that cannot be
> chained and therefore must be withheld if chaining is attempted.
> 
> This attribute can also be used to indicate that no chaining is
> allowed.  Its value should be set to -1 in that case.

Shouldn't chaining be disabled by default?  This is inviting bugs where drivers
don't implement chaining, but leave final_chunksize unset (0) which apparently
indicates that chaining is supported.

- Eric

  reply	other threads:[~2020-07-28 17:15 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-28  7:17 [v3 PATCH 0/31] crypto: skcipher - Add support for no chaining and partial chaining Herbert Xu
2020-07-28  7:18 ` [v3 PATCH 1/31] crypto: skcipher - Add final chunk size field for chaining Herbert Xu
2020-07-28 17:15   ` Eric Biggers [this message]
2020-07-28 17:22     ` Herbert Xu
2020-07-28 17:26       ` Ard Biesheuvel
2020-07-28 17:30         ` Herbert Xu
2020-07-28 17:46           ` Ard Biesheuvel
2020-07-28 22:12             ` Herbert Xu
2020-07-28  7:18 ` [v3 PATCH 2/31] crypto: algif_skcipher - Add support for final_chunksize Herbert Xu
2020-07-28  7:18 ` [v3 PATCH 3/31] crypto: cts - Add support for chaining Herbert Xu
2020-07-28 11:05   ` Ard Biesheuvel
2020-07-28 11:53     ` Herbert Xu
2020-07-28 11:59       ` Ard Biesheuvel
2020-07-28 12:03         ` Herbert Xu
2020-07-28 12:08           ` Ard Biesheuvel
2020-07-28 12:19             ` Herbert Xu
2020-07-28  7:18 ` [v3 PATCH 4/31] crypto: arm64/aes-glue - Add support for chaining CTS Herbert Xu
2020-07-28  7:18 ` [v3 PATCH 5/31] crypto: nitrox " Herbert Xu
2020-07-28  7:18 ` [v3 PATCH 6/31] crypto: ccree " Herbert Xu
2020-07-28  7:18 ` [v3 PATCH 7/31] crypto: skcipher - Add alg reqsize field Herbert Xu
2020-07-28  7:18 ` [v3 PATCH 8/31] crypto: skcipher - Initialise requests to zero Herbert Xu
2020-07-28 17:10   ` Eric Biggers
2020-07-29  3:38     ` Herbert Xu
2020-07-28  7:18 ` [v3 PATCH 9/31] crypto: cryptd - Add support for chaining Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 10/31] crypto: chacha-generic " Herbert Xu
2020-08-10 15:20   ` Horia Geantă
2020-08-11  0:57     ` Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 11/31] crypto: arm/chacha " Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 12/31] crypto: arm64/chacha " Herbert Xu
2020-07-29  6:16   ` Ard Biesheuvel
2020-07-29  6:28     ` Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 13/31] crypto: mips/chacha " Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 14/31] crypto: x86/chacha " Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 15/31] crypto: inside-secure - Set final_chunksize on chacha Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 16/31] crypto: caam/qi2 " Herbert Xu
2020-08-10 15:24   ` Horia Geantă
2020-07-28  7:19 ` [v3 PATCH 17/31] crypto: ctr - Allow rfc3686 to be chained Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 18/31] crypto: crypto4xx - Remove rfc3686 implementation Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 19/31] crypto: caam - Remove rfc3686 implementations Herbert Xu
2020-08-10 16:47   ` Horia Geantă
2020-08-11  0:59     ` Herbert Xu
2020-08-11  7:32       ` Horia Geantă
2020-08-11  7:34         ` Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 20/31] crypto: nitrox - Set final_chunksize on rfc3686 Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 21/31] crypto: ccp - Remove rfc3686 implementation Herbert Xu
2020-08-06 19:16   ` John Allen
2020-07-28  7:19 ` [v3 PATCH 22/31] crypto: chelsio " Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 23/31] crypto: inside-secure - Set final_chunksize on rfc3686 Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 24/31] crypto: ixp4xx - Remove rfc3686 implementation Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 25/31] crypto: nx - Set final_chunksize on rfc3686 Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 26/31] crypto: essiv - Set final_chunksize Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 27/31] crypto: simd - Add support for chaining Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 28/31] crypto: arm64/essiv - Set final_chunksize Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 29/31] crypto: ccree - Set final_chunksize on essiv Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 30/31] crypto: kw - Set final_chunksize Herbert Xu
2020-07-28  7:19 ` [v3 PATCH 31/31] crypto: salsa20-generic - dd support for chaining Herbert Xu
2020-07-28 17:19 ` [v3 PATCH 0/31] crypto: skcipher - Add support for no chaining and partial chaining Eric Biggers
2020-07-29  3:40   ` Herbert Xu

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