linux-kernel - Re: [PATCH v4 5/5] crypto: AES CBC multi-buffer glue code

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Message-ID: <20151209025242.GA24861@gondor.apana.org.au>
Date:	Wed, 9 Dec 2015 10:52:42 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	"David S.Miller" <davem@...emloft.net>,
	Stephan Mueller <smueller@...onox.de>,
	Chandramouli Narayanan <mouli_7982@...oo.com>,
	Vinodh Gopal <vinodh.gopal@...el.com>,
	James Guilford <james.guilford@...el.com>,
	Wajdi Feghali <wajdi.k.feghali@...el.com>,
	Jussi Kivilinna <jussi.kivilinna@....fi>,
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 5/5] crypto: AES CBC multi-buffer glue code

On Wed, Dec 02, 2015 at 12:02:45PM -0800, Tim Chen wrote:
>
> +/*
> + * CRYPTO_ALG_ASYNC flag is passed to indicate we have an ablk
> + * scatter-gather walk.
> + */
> +
> +static struct crypto_alg aes_cbc_mb_alg = {
> +	.cra_name		= "__cbc-aes-aesni-mb",
> +	.cra_driver_name	= "__driver-cbc-aes-aesni-mb",
> +	.cra_priority		= 100,
> +	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER | CRYPTO_ALG_ASYNC
> +					| CRYPTO_ALG_INTERNAL,
> +	.cra_blocksize		= AES_BLOCK_SIZE,
> +	.cra_ctxsize		= sizeof(struct crypto_aes_ctx) +
> +				  AESNI_ALIGN - 1,
> +	.cra_alignmask		= 0,
> +	.cra_type		= &crypto_blkcipher_type,
> +	.cra_module		= THIS_MODULE,
> +	.cra_list		= LIST_HEAD_INIT(aes_cbc_mb_alg.cra_list),
> +	.cra_u = {
> +		.blkcipher = {
> +			.min_keysize	= AES_MIN_KEY_SIZE,
> +			.max_keysize	= AES_MAX_KEY_SIZE,
> +			.ivsize		= AES_BLOCK_SIZE,
> +			.setkey		= aes_set_key,
> +			.encrypt	= mb_aes_cbc_encrypt,
> +			.decrypt	= mb_aes_cbc_decrypt
> +		},
> +	},
> +};

So why do we still need this? Shouldn't a single ablkcipher cover
all the cases?

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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