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crypto: cryptd - Add support to access underlying blkcipher

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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: Huang Ying <ying.huang@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Huang Ying 2009-01-18 16:19:46 +11:00 committed by Herbert Xu
parent 1693531e9e
commit 1cac2cbc76
2 changed files with 62 additions and 0 deletions
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35
crypto/cryptd.c
View File

@ -12,6 +12,7 @@
#include <crypto/algapi.h> #include <crypto/algapi.h>
#include <crypto/internal/hash.h> #include <crypto/internal/hash.h>
#include <crypto/cryptd.h>
#include <linux/err.h> #include <linux/err.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/kernel.h> #include <linux/kernel.h>
@ -537,6 +538,40 @@ static struct crypto_template cryptd_tmpl = {
.module = THIS_MODULE, .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, static inline int cryptd_create_thread(struct cryptd_state *state,
int (*fn)(void *data), const char *name) int (*fn)(void *data), const char *name)
{ {

27
include/crypto/cryptd.h Normal file
View File

@ -0,0 +1,27 @@
/*
* 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