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crypto: aead - Add type-safe geniv init/exit helpers 

This patch adds the helpers aead_init_geniv and aead_exit_geniv
which are type-safe and intended the replace the existing geniv
init/exit helpers.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2015-08-13 17:28:58 +08:00
parent 66008d4230
commit 149a39717d
4 changed files with 74 additions and 9 deletions
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11
crypto/Kconfig
View File

@ -48,6 +48,8 @@ config CRYPTO_AEAD
config CRYPTO_AEAD2
tristate
select CRYPTO_ALGAPI2
select CRYPTO_NULL2
select CRYPTO_RNG2
config CRYPTO_BLKCIPHER
tristate
@ -150,12 +152,15 @@ config CRYPTO_GF128MUL
config CRYPTO_NULL
tristate "Null algorithms"
select CRYPTO_ALGAPI
select CRYPTO_BLKCIPHER
select CRYPTO_HASH
select CRYPTO_NULL2
help
These are 'Null' algorithms, used by IPsec, which do nothing.
config CRYPTO_NULL2
select CRYPTO_ALGAPI2
select CRYPTO_BLKCIPHER2
select CRYPTO_HASH2
config CRYPTO_PCRYPT
tristate "Parallel crypto engine"
depends on SMP

55
crypto/aead.c
View File

@ -13,6 +13,8 @@
*/
#include <crypto/internal/geniv.h>
#include <crypto/internal/rng.h>
#include <crypto/null.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
#include <linux/init.h>
@ -746,6 +748,59 @@ void aead_geniv_exit(struct crypto_tfm *tfm)
}
EXPORT_SYMBOL_GPL(aead_geniv_exit);
int aead_init_geniv(struct crypto_aead *aead)
{
struct aead_geniv_ctx *ctx = crypto_aead_ctx(aead);
struct aead_instance *inst = aead_alg_instance(aead);
struct crypto_aead *child;
int err;
spin_lock_init(&ctx->lock);
err = crypto_get_default_rng();
if (err)
goto out;
err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
crypto_aead_ivsize(aead));
crypto_put_default_rng();
if (err)
goto out;
ctx->null = crypto_get_default_null_skcipher();
err = PTR_ERR(ctx->null);
if (IS_ERR(ctx->null))
goto out;
child = crypto_spawn_aead(aead_instance_ctx(inst));
err = PTR_ERR(child);
if (IS_ERR(child))
goto drop_null;
ctx->child = child;
crypto_aead_set_reqsize(aead, crypto_aead_reqsize(child) +
sizeof(struct aead_request));
err = 0;
out:
return err;
drop_null:
crypto_put_default_null_skcipher();
goto out;
}
EXPORT_SYMBOL_GPL(aead_init_geniv);
void aead_exit_geniv(struct crypto_aead *tfm)
{
struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
crypto_free_aead(ctx->child);
crypto_put_default_null_skcipher();
}
EXPORT_SYMBOL_GPL(aead_exit_geniv);
static int crypto_nivaead_default(struct crypto_alg *alg, u32 type, u32 mask)
{
struct rtattr *tb[3];

6
include/crypto/internal/aead.h
View File

@ -123,12 +123,6 @@ static inline struct crypto_aead *crypto_spawn_aead(
return crypto_spawn_tfm2(&spawn->base);
}
struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
struct rtattr **tb, u32 type, u32 mask);
void aead_geniv_free(struct aead_instance *inst);
int aead_geniv_init(struct crypto_tfm *tfm);
void aead_geniv_exit(struct crypto_tfm *tfm);
static inline struct crypto_aead *aead_geniv_base(struct crypto_aead *geniv)
{
return geniv->child;

11
include/crypto/internal/geniv.h
View File

@ -15,10 +15,21 @@
#include <crypto/internal/aead.h>
#include <linux/spinlock.h>
#include <linux/types.h>
struct aead_geniv_ctx {
spinlock_t lock;
struct crypto_aead *child;
struct crypto_blkcipher *null;
u8 salt[] __attribute__ ((aligned(__alignof__(u32))));
};
struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
struct rtattr **tb, u32 type, u32 mask);
void aead_geniv_free(struct aead_instance *inst);
int aead_geniv_init(struct crypto_tfm *tfm);
void aead_geniv_exit(struct crypto_tfm *tfm);
int aead_init_geniv(struct crypto_aead *tfm);
void aead_exit_geniv(struct crypto_aead *tfm);
#endif /* _CRYPTO_INTERNAL_GENIV_H */