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

[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 <>
parent df89820e
......@@ -16,6 +16,7 @@
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/rtnetlink.h>
#include <linux/string.h>
#include "internal.h"
......@@ -415,6 +416,58 @@ int crypto_unregister_notifier(struct notifier_block *nb)
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);
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);
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;
return ERR_PTR(err);
static int __init crypto_algapi_init(void)
......@@ -51,6 +51,11 @@ int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
void crypto_drop_spawn(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)
return inst->__ctx;
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