linux-kernel - Re: [RFC PATCH crypto -v3 1/2] AES-NI: Add support to access underlying blkcipher under cryptd ablkcipher

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Date:	Thu, 15 Jan 2009 14:14:54 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Sebastian Siewior <linux-crypto@...breakpoint.cc>,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [RFC PATCH crypto -v3 1/2] AES-NI: Add support to access
	underlying blkcipher under cryptd ablkcipher

On Wed, Jan 14, 2009 at 03:44:06PM +0800, Huang Ying wrote:
> cryptd_alloc_ablkcipher() will allocate a cryptd-ed ablkcipher for
> specified algorithm name. The new allocated one is guaranteed to be
> cryptd-ed ablkcipher, so the blkcipher underlying can be gotten via
> cryptd_ablkcipher_child().
> 
> Signed-off-by: Huang Ying <ying.huang@...el.com>

Thanks for the patch!
  
> +struct crypto_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,
> +						  u32 type, u32 mask)

It should have its own type so that we get compiler type checking.
Something like,

	struct cryptd_ablkcipher {
		struct crypto_ablkcipher *cipher;
	};

> +	if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,
> +		     "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)
> +		return ERR_PTR(-EINVAL);
> +	return crypto_alloc_ablkcipher(cryptd_alg_name, type, mask);

We should also check that the new tfm's module matches ours, i.e.,

	crypto_ablkcipher_tfm(cipher)->__crt_alg->cra_module ==
	THIS_MODULE

Granted this doesn't do much if we're built-in but it's better
than nothing.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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