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Commit ace13663 authored by Huang Ying's avatar Huang Ying Committed by Herbert Xu
Browse files

crypto: cryptd - Add support to access underlaying shash 



cryptd_alloc_ahash() will allocate a cryptd-ed ahash for specified
algorithm name. The new allocated one is guaranteed to be cryptd-ed
ahash, so the shash underlying can be gotten via cryptd_ahash_child().

Signed-off-by: default avatarHuang Ying <ying.huang@intel.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 9382d97a

crypto/cryptd.c

+35 −0
Original line number Diff line number Diff line
@@ -682,6 +682,41 @@ void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm) 
}

EXPORT_SYMBOL_GPL(cryptd_free_ablkcipher);



struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,

					u32 type, u32 mask)

{

	char cryptd_alg_name[CRYPTO_MAX_ALG_NAME];

	struct crypto_ahash *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_ahash(cryptd_alg_name, type, mask);

	if (IS_ERR(tfm))

		return ERR_CAST(tfm);

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

		crypto_free_ahash(tfm);

		return ERR_PTR(-EINVAL);

	}



	return __cryptd_ahash_cast(tfm);

}

EXPORT_SYMBOL_GPL(cryptd_alloc_ahash);



struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm)

{

	struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(&tfm->base);



	return ctx->child;

}

EXPORT_SYMBOL_GPL(cryptd_ahash_child);



void cryptd_free_ahash(struct cryptd_ahash *tfm)

{

	crypto_free_ahash(&tfm->base);

}

EXPORT_SYMBOL_GPL(cryptd_free_ahash);



static int __init cryptd_init(void)

{

	int err;

include/crypto/cryptd.h

+17 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 


#include <linux/crypto.h>

#include <linux/kernel.h>

#include <crypto/hash.h>



struct cryptd_ablkcipher {

	struct crypto_ablkcipher base;
@@ -24,4 +25,20 @@ struct cryptd_ablkcipher *cryptd_alloc_ablkcipher(const char *alg_name, 
struct crypto_blkcipher *cryptd_ablkcipher_child(struct cryptd_ablkcipher *tfm);

void cryptd_free_ablkcipher(struct cryptd_ablkcipher *tfm);



struct cryptd_ahash {

	struct crypto_ahash base;

};



static inline struct cryptd_ahash *__cryptd_ahash_cast(

	struct crypto_ahash *tfm)

{

	return (struct cryptd_ahash *)tfm;

}



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

struct cryptd_ahash *cryptd_alloc_ahash(const char *alg_name,

					u32 type, u32 mask);

struct crypto_shash *cryptd_ahash_child(struct cryptd_ahash *tfm);

void cryptd_free_ahash(struct cryptd_ahash *tfm);



#endif