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Commit 7fed0bf2 authored by Herbert Xu's avatar Herbert Xu
Browse files

[CRYPTO] api: Add common instance initialisation code 



This patch adds the helpers crypto_get_attr_alg and crypto_alloc_instance
which can be used by simple one-argument templates like hmac to process
input parameters and allocate instances.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent df89820e

crypto/algapi.c

+53 −0
Original line number Original line Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/kernel.h>

#include <linux/kernel.h>

#include <linux/list.h>

#include <linux/list.h>

#include <linux/module.h>

#include <linux/module.h>

#include <linux/rtnetlink.h>

#include <linux/string.h>

#include <linux/string.h>





#include "internal.h"

#include "internal.h"
@@ -415,6 +416,58 @@ int crypto_unregister_notifier(struct notifier_block *nb) 
}

}

EXPORT_SYMBOL_GPL(crypto_unregister_notifier);

EXPORT_SYMBOL_GPL(crypto_unregister_notifier);





struct crypto_alg *crypto_get_attr_alg(void *param, unsigned int len,

				       u32 type, u32 mask)

{

	struct rtattr *rta = param;

	struct crypto_attr_alg *alga;



	if (!RTA_OK(rta, len))

		return ERR_PTR(-EBADR);

	if (rta->rta_type != CRYPTOA_ALG || RTA_PAYLOAD(rta) < sizeof(*alga))

		return ERR_PTR(-EINVAL);



	alga = RTA_DATA(rta);

	alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;



	return crypto_alg_mod_lookup(alga->name, type, mask);

}

EXPORT_SYMBOL_GPL(crypto_get_attr_alg);



struct crypto_instance *crypto_alloc_instance(const char *name,

					      struct crypto_alg *alg)

{

	struct crypto_instance *inst;

	struct crypto_spawn *spawn;

	int err;



	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);

	if (!inst)

		return ERR_PTR(-ENOMEM);



	err = -ENAMETOOLONG;

	if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,

		     alg->cra_name) >= CRYPTO_MAX_ALG_NAME)

		goto err_free_inst;



	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",

		     name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)

		goto err_free_inst;



	spawn = crypto_instance_ctx(inst);

	err = crypto_init_spawn(spawn, alg, inst);



	if (err)

		goto err_free_inst;



	return inst;



err_free_inst:

	kfree(inst);

	return ERR_PTR(err);

}

EXPORT_SYMBOL_GPL(crypto_alloc_instance);



static int __init crypto_algapi_init(void)

static int __init crypto_algapi_init(void)

{

{

	crypto_init_proc();

	crypto_init_proc();

include/crypto/algapi.h

+5 −0
Original line number Original line Diff line number Diff line
@@ -51,6 +51,11 @@ int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, 
void crypto_drop_spawn(struct crypto_spawn *spawn);

void crypto_drop_spawn(struct crypto_spawn *spawn);

struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn);

struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn);





struct crypto_alg *crypto_get_attr_alg(void *param, unsigned int len,

				       u32 type, u32 mask);

struct crypto_instance *crypto_alloc_instance(const char *name,

					      struct crypto_alg *alg);



static inline void *crypto_instance_ctx(struct crypto_instance *inst)

static inline void *crypto_instance_ctx(struct crypto_instance *inst)

{

{

	return inst->__ctx;

	return inst->__ctx;