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crypto: api - Add crypto_alloc_instance2

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This patch adds a new argument to crypto_alloc_instance which
sets aside some space before the instance for use by algorithms
such as shash that place type-specific data before crypto_alg.

For compatibility the function has been renamed so that existing
users aren't affected.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2009-07-07 14:07:37 +08:00
parent f2ac72e826
commit 70ec7bb91a
2 changed files with 33 additions and 6 deletions
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37
crypto/algapi.c
View File

@ -627,17 +627,20 @@ int crypto_attr_u32(struct rtattr *rta, u32 *num)
}
EXPORT_SYMBOL_GPL(crypto_attr_u32);
struct crypto_instance *crypto_alloc_instance(const char *name,
struct crypto_alg *alg)
void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
unsigned int head)
{
struct crypto_instance *inst;
struct crypto_spawn *spawn;
char *p;
int err;
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
if (!inst)
p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
GFP_KERNEL);
if (!p)
return ERR_PTR(-ENOMEM);
inst = (void *)(p + head);
err = -ENAMETOOLONG;
if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
@ -647,6 +650,25 @@ struct crypto_instance *crypto_alloc_instance(const char *name,
name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
goto err_free_inst;
return p;
err_free_inst:
kfree(p);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
struct crypto_instance *crypto_alloc_instance(const char *name,
struct crypto_alg *alg)
{
struct crypto_instance *inst;
struct crypto_spawn *spawn;
int err;
inst = crypto_alloc_instance2(name, alg, 0);
if (IS_ERR(inst))
goto out;
spawn = crypto_instance_ctx(inst);
err = crypto_init_spawn(spawn, alg, inst,
CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
@ -658,7 +680,10 @@ struct crypto_instance *crypto_alloc_instance(const char *name,
err_free_inst:
kfree(inst);
return ERR_PTR(err);
inst = ERR_PTR(err);
out:
return inst;
}
EXPORT_SYMBOL_GPL(crypto_alloc_instance);

2
include/crypto/algapi.h
View File

@ -132,6 +132,8 @@ int crypto_check_attr_type(struct rtattr **tb, u32 type);
const char *crypto_attr_alg_name(struct rtattr *rta);
struct crypto_alg *crypto_attr_alg(struct rtattr *rta, u32 type, u32 mask);
int crypto_attr_u32(struct rtattr *rta, u32 *num);
void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
unsigned int head);
struct crypto_instance *crypto_alloc_instance(const char *name,
struct crypto_alg *alg);