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crypto: shash - Make descsize a run-time attribute 

This patch changes descsize to a run-time attribute so that
implementations can change it in their init functions.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2009-07-14 12:50:12 +08:00
parent aef73cfcb9
commit 113adefc73
3 changed files with 31 additions and 13 deletions
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39
crypto/shash.c
View File

@ -300,14 +300,16 @@ static int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
static int shash_compat_setkey(struct crypto_hash *tfm, const u8 *key,
unsigned int keylen)
{
struct shash_desc *desc = crypto_hash_ctx(tfm);
struct shash_desc **descp = crypto_hash_ctx(tfm);
struct shash_desc *desc = *descp;
return crypto_shash_setkey(desc->tfm, key, keylen);
}
static int shash_compat_init(struct hash_desc *hdesc)
{
struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
struct shash_desc *desc = *descp;
desc->flags = hdesc->flags;
@ -317,7 +319,8 @@ static int shash_compat_init(struct hash_desc *hdesc)
static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
unsigned int len)
{
struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
struct shash_desc *desc = *descp;
struct crypto_hash_walk walk;
int nbytes;
@ -330,7 +333,9 @@ static int shash_compat_update(struct hash_desc *hdesc, struct scatterlist *sg,
static int shash_compat_final(struct hash_desc *hdesc, u8 *out)
{
return crypto_shash_final(crypto_hash_ctx(hdesc->tfm), out);
struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
return crypto_shash_final(*descp, out);
}
static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
@ -340,7 +345,8 @@ static int shash_compat_digest(struct hash_desc *hdesc, struct scatterlist *sg,
int err;
if (nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset)) {
struct shash_desc *desc = crypto_hash_ctx(hdesc->tfm);
struct shash_desc **descp = crypto_hash_ctx(hdesc->tfm);
struct shash_desc *desc = *descp;
void *data;
desc->flags = hdesc->flags;
@ -368,9 +374,11 @@ out:
static void crypto_exit_shash_ops_compat(struct crypto_tfm *tfm)
{
struct shash_desc *desc= crypto_tfm_ctx(tfm);
struct shash_desc **descp = crypto_tfm_ctx(tfm);
struct shash_desc *desc = *descp;
crypto_free_shash(desc->tfm);
kzfree(desc);
}
static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
@ -378,8 +386,9 @@ static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
struct hash_tfm *crt = &tfm->crt_hash;
struct crypto_alg *calg = tfm->__crt_alg;
struct shash_alg *alg = __crypto_shash_alg(calg);
struct shash_desc *desc = crypto_tfm_ctx(tfm);
struct shash_desc **descp = crypto_tfm_ctx(tfm);
struct crypto_shash *shash;
struct shash_desc *desc;
if (!crypto_mod_get(calg))
return -EAGAIN;
@ -390,6 +399,14 @@ static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
return PTR_ERR(shash);
}
desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(shash),
GFP_KERNEL);
if (!desc) {
crypto_free_shash(shash);
return -ENOMEM;
}
*descp = desc;
desc->tfm = shash;
tfm->exit = crypto_exit_shash_ops_compat;
@ -419,11 +436,9 @@ static int crypto_init_shash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
u32 mask)
{
struct shash_alg *salg = __crypto_shash_alg(alg);
switch (mask & CRYPTO_ALG_TYPE_MASK) {
case CRYPTO_ALG_TYPE_HASH_MASK:
return sizeof(struct shash_desc) + salg->descsize;
return sizeof(struct shash_desc *);
case CRYPTO_ALG_TYPE_AHASH_MASK:
return sizeof(struct crypto_shash *);
}
@ -434,6 +449,9 @@ static unsigned int crypto_shash_ctxsize(struct crypto_alg *alg, u32 type,
static int crypto_shash_init_tfm(struct crypto_tfm *tfm,
const struct crypto_type *frontend)
{
struct crypto_shash *hash = __crypto_shash_cast(tfm);
hash->descsize = crypto_shash_alg(hash)->descsize;
return 0;
}
@ -452,7 +470,6 @@ static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
seq_printf(m, "type : shash\n");
seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
seq_printf(m, "digestsize : %u\n", salg->digestsize);
seq_printf(m, "descsize : %u\n", salg->descsize);
}
static const struct crypto_type crypto_shash_type = {

3
include/crypto/hash.h
View File

@ -48,6 +48,7 @@ struct crypto_ahash {
};
struct crypto_shash {
unsigned int descsize;
struct crypto_tfm base;
};
@ -275,7 +276,7 @@ static inline void crypto_shash_clear_flags(struct crypto_shash *tfm, u32 flags)
static inline unsigned int crypto_shash_descsize(struct crypto_shash *tfm)
{
return crypto_shash_alg(tfm)->descsize;
return tfm->descsize;
}
static inline void *shash_desc_ctx(struct shash_desc *desc)

2
include/crypto/internal/hash.h
View File

@ -135,7 +135,7 @@ static inline void *crypto_shash_ctx_aligned(struct crypto_shash *tfm)
static inline struct crypto_shash *__crypto_shash_cast(struct crypto_tfm *tfm)
{
return (struct crypto_shash *)tfm;
return container_of(tfm, struct crypto_shash, base);
}
#endif /* _CRYPTO_INTERNAL_HASH_H */