From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: Eric Biggers <ebiggers@kernel.org>
Cc: "open list:HARDWARE RANDOM NUMBER GENERATOR CORE"
<linux-crypto@vger.kernel.org>,
linux-fscrypt@vger.kernel.org,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Herbert Xu <herbert@gondor.apana.org.au>,
Paul Crowley <paulcrowley@google.com>,
Greg Kaiser <gkaiser@google.com>,
Michael Halcrow <mhalcrow@google.com>,
"Jason A . Donenfeld" <Jason@zx2c4.com>,
Samuel Neves <samuel.c.p.neves@gmail.com>,
Tomer Ashur <tomer.ashur@esat.kuleuven.be>
Subject: Re: [RFC PATCH v2 07/12] crypto: arm/chacha - add XChaCha12 support
Date: Sat, 20 Oct 2018 11:36:15 +0800 [thread overview]
Message-ID: <CAKv+Gu91O99D48Dr-2UKrXdPrzGSFDGr_qH9zLpbvqDwd50DAw@mail.gmail.com> (raw)
In-Reply-To: <20181015175424.97147-8-ebiggers@kernel.org>
On 16 October 2018 at 01:54, Eric Biggers <ebiggers@kernel.org> wrote:
> From: Eric Biggers <ebiggers@google.com>
>
> Now that the 32-bit ARM NEON implementation of ChaCha20 and XChaCha20
> has been refactored to support varying the number of rounds, add support
> for XChaCha12. This is identical to XChaCha20 except for the number of
> rounds, which is 12 instead of 20.
>
> XChaCha12 is faster than XChaCha20 but has a lower security margin,
> though still greater than AES-256's since the best known attacks make it
> through only 7 rounds. See the patch "crypto: chacha - add XChaCha12
> support" for more details about why we need XChaCha12 support.
>
> Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
> arch/arm/crypto/Kconfig | 2 +-
> arch/arm/crypto/chacha-neon-glue.c | 21 ++++++++++++++++++++-
> 2 files changed, 21 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/crypto/Kconfig b/arch/arm/crypto/Kconfig
> index 0aa1471f27d2e..cc932d9bba561 100644
> --- a/arch/arm/crypto/Kconfig
> +++ b/arch/arm/crypto/Kconfig
> @@ -117,7 +117,7 @@ config CRYPTO_CRC32_ARM_CE
> select CRYPTO_HASH
>
> config CRYPTO_CHACHA20_NEON
> - tristate "NEON accelerated ChaCha20 stream cipher algorithms"
> + tristate "NEON accelerated ChaCha stream cipher algorithms"
> depends on KERNEL_MODE_NEON
> select CRYPTO_BLKCIPHER
> select CRYPTO_CHACHA20
> diff --git a/arch/arm/crypto/chacha-neon-glue.c b/arch/arm/crypto/chacha-neon-glue.c
> index b236af4889c61..0b1b238227707 100644
> --- a/arch/arm/crypto/chacha-neon-glue.c
> +++ b/arch/arm/crypto/chacha-neon-glue.c
> @@ -1,5 +1,6 @@
> /*
> - * ChaCha20 (RFC7539) and XChaCha20 stream ciphers, NEON accelerated
> + * ARM NEON accelerated ChaCha and XChaCha stream ciphers,
> + * including ChaCha20 (RFC7539)
> *
> * Copyright (C) 2016 Linaro, Ltd. <ard.biesheuvel@linaro.org>
> *
> @@ -160,6 +161,22 @@ static struct skcipher_alg algs[] = {
> .setkey = crypto_chacha20_setkey,
> .encrypt = xchacha_neon,
> .decrypt = xchacha_neon,
> + }, {
> + .base.cra_name = "xchacha12",
> + .base.cra_driver_name = "xchacha12-neon",
> + .base.cra_priority = 300,
> + .base.cra_blocksize = 1,
> + .base.cra_ctxsize = sizeof(struct chacha_ctx),
> + .base.cra_module = THIS_MODULE,
> +
> + .min_keysize = CHACHA_KEY_SIZE,
> + .max_keysize = CHACHA_KEY_SIZE,
> + .ivsize = XCHACHA_IV_SIZE,
> + .chunksize = CHACHA_BLOCK_SIZE,
> + .walksize = 4 * CHACHA_BLOCK_SIZE,
> + .setkey = crypto_chacha12_setkey,
> + .encrypt = xchacha_neon,
> + .decrypt = xchacha_neon,
> }
> };
>
> @@ -186,3 +203,5 @@ MODULE_ALIAS_CRYPTO("chacha20");
> MODULE_ALIAS_CRYPTO("chacha20-neon");
> MODULE_ALIAS_CRYPTO("xchacha20");
> MODULE_ALIAS_CRYPTO("xchacha20-neon");
> +MODULE_ALIAS_CRYPTO("xchacha12");
> +MODULE_ALIAS_CRYPTO("xchacha12-neon");
> --
> 2.19.1.331.ge82ca0e54c-goog
>
next prev parent reply other threads:[~2018-10-20 3:36 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-15 17:54 [RFC PATCH v2 00/12] crypto: Adiantum support Eric Biggers
2018-10-15 17:54 ` [RFC PATCH v2 01/12] crypto: chacha20-generic - add HChaCha20 library function Eric Biggers
2018-10-19 14:13 ` Ard Biesheuvel
2018-10-15 17:54 ` [RFC PATCH v2 02/12] crypto: chacha20-generic - add XChaCha20 support Eric Biggers
2018-10-19 14:24 ` Ard Biesheuvel
2018-10-15 17:54 ` [RFC PATCH v2 03/12] crypto: chacha20-generic - refactor to allow varying number of rounds Eric Biggers
2018-10-19 14:25 ` Ard Biesheuvel
2018-10-15 17:54 ` [RFC PATCH v2 04/12] crypto: chacha - add XChaCha12 support Eric Biggers
2018-10-19 14:34 ` Ard Biesheuvel
2018-10-19 18:28 ` Eric Biggers
2018-10-15 17:54 ` [RFC PATCH v2 05/12] crypto: arm/chacha20 - add XChaCha20 support Eric Biggers
2018-10-20 2:29 ` Ard Biesheuvel
2018-10-15 17:54 ` [RFC PATCH v2 06/12] crypto: arm/chacha20 - refactor to allow varying number of rounds Eric Biggers
2018-10-20 3:35 ` Ard Biesheuvel
2018-10-20 5:26 ` Eric Biggers
2018-10-15 17:54 ` [RFC PATCH v2 07/12] crypto: arm/chacha - add XChaCha12 support Eric Biggers
2018-10-20 3:36 ` Ard Biesheuvel [this message]
2018-10-15 17:54 ` [RFC PATCH v2 08/12] crypto: poly1305 - add Poly1305 core API Eric Biggers
2018-10-20 3:45 ` Ard Biesheuvel
2018-10-15 17:54 ` [RFC PATCH v2 09/12] crypto: nhpoly1305 - add NHPoly1305 support Eric Biggers
2018-10-20 4:00 ` Ard Biesheuvel
2018-10-20 5:38 ` Eric Biggers
2018-10-20 15:06 ` Ard Biesheuvel
2018-10-22 18:42 ` Eric Biggers
2018-10-22 22:25 ` Ard Biesheuvel
2018-10-22 22:40 ` Eric Biggers
2018-10-22 22:43 ` Ard Biesheuvel
2018-10-15 17:54 ` [RFC PATCH v2 10/12] crypto: arm/nhpoly1305 - add NEON-accelerated NHPoly1305 Eric Biggers
2018-10-20 4:12 ` Ard Biesheuvel
2018-10-20 5:51 ` Eric Biggers
2018-10-20 15:00 ` Ard Biesheuvel
2018-10-15 17:54 ` [RFC PATCH v2 11/12] crypto: adiantum - add Adiantum support Eric Biggers
2018-10-20 4:17 ` Ard Biesheuvel
2018-10-20 7:12 ` Eric Biggers
2018-10-23 10:40 ` Ard Biesheuvel
2018-10-24 22:06 ` Eric Biggers
2018-10-30 8:17 ` Herbert Xu
2018-10-15 17:54 ` [RFC PATCH v2 12/12] fscrypt: " Eric Biggers
2018-10-19 15:58 ` [RFC PATCH v2 00/12] crypto: " Jason A. Donenfeld
2018-10-19 18:19 ` Paul Crowley
2018-10-20 3:24 ` Ard Biesheuvel
2018-10-20 5:22 ` Eric Biggers
[not found] ` <2395454e-a0dc-408f-4138-9d15ab5f20b8@esat.kuleuven.be>
2018-10-22 11:20 ` Tomer Ashur
2018-10-19 19:04 ` Eric Biggers
2018-10-20 10:26 ` Milan Broz
2018-10-20 13:47 ` Jason A. Donenfeld
2018-11-16 21:52 ` Eric Biggers
2018-11-17 10:29 ` Milan Broz
2018-11-19 19:28 ` Eric Biggers
2018-11-19 20:05 ` Milan Broz
2018-11-19 20:30 ` Jason A. Donenfeld
2018-10-21 22:23 ` Eric Biggers
2018-10-21 22:51 ` Jason A. Donenfeld
2018-10-22 17:17 ` Paul Crowley
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