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Commit 1cac2cbc authored by Huang Ying's avatar Huang Ying Committed by Herbert Xu
Browse files

crypto: cryptd - Add support to access underlying blkcipher 



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: default avatarHuang Ying <ying.huang@intel.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 1693531e

crypto/cryptd.c

+35 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 


#include <crypto/algapi.h>

#include <crypto/internal/hash.h>

#include <crypto/cryptd.h>

#include <linux/err.h>

#include <linux/init.h>

#include <linux/kernel.h>
@@ -537,6 +538,40 @@ static struct crypto_template cryptd_tmpl = { 
	.module = THIS_MODULE,

};



struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,

						  u32 type, u32 mask)

{

	char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];

	struct crypto_ablkcipher *tfm;



	if (snprintf(cryptd_alg_name, CRYPTO_MAX_ALG_NAME,

		     "cryptd(%s)", alg_name) >= CRYPTO_MAX_ALG_NAME)

		return ERR_PTR(-EINVAL);

	tfm = crypto_alloc_ablkcipher(cryptd_alg_name, type, mask);

	if (IS_ERR(tfm))

		return ERR_CAST(tfm);

	if (crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_module != THIS_MODULE) {

		crypto_free_ablkcipher(tfm);

		return ERR_PTR(-EINVAL);

	}



	return __cryptd_ablkcipher_cast(tfm);

}

EXPORT_SYMBOL_GPL(cryptd_alloc_ablkcipher);



struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm)

{

	struct cryptd_blkcipher_ctx *ctx = crypto_ablkcipher_ctx(&tfm->base);

	return ctx->child;

}

EXPORT_SYMBOL_GPL(cryptd_ablkcipher_child);



void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm)

{

	crypto_free_ablkcipher(&tfm->base);

}

EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);



static inline int cryptd_create_thread(struct cryptd_state *state,

				       int (*fn)(void *data), const char *name)

{

include/crypto/cryptd.h

0 → 100644
+27 −0
Original line number Diff line number Diff line 
/*

 * Software async crypto daemon

 */



#ifndef _CRYPTO_CRYPT_H

#define _CRYPTO_CRYPT_H



#include <linux/crypto.h>

#include <linux/kernel.h>



struct cryptd_ablkcipher {

	struct crypto_ablkcipher base;

};



static inline struct cryptd_ablkcipher *__cryptd_ablkcipher_cast(

	struct crypto_ablkcipher *tfm)

{

	return (struct cryptd_ablkcipher *)tfm;

}



/* alg_name should be algorithm to be cryptd-ed */

struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name,

						  u32 type, u32 mask);

struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm);

void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm);



#endif