return 0;
}
+static void crypto_shash_exit_tfm(struct crypto_tfm *tfm)
+{
+ struct crypto_shash *hash = __crypto_shash_cast(tfm);
+ struct shash_alg *alg = crypto_shash_alg(hash);
+
+ alg->exit_tfm(hash);
+}
+
static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
{
struct crypto_shash *hash = __crypto_shash_cast(tfm);
struct shash_alg *alg = crypto_shash_alg(hash);
+ int err;
hash->descsize = alg->descsize;
shash_set_needkey(hash, alg);
+ if (alg->exit_tfm)
+ tfm->exit = crypto_shash_exit_tfm;
+
+ if (!alg->init_tfm)
+ return 0;
+
+ err = alg->init_tfm(hash);
+ if (err)
+ return err;
+
+ /* ->init_tfm() may have increased the descsize. */
+ if (WARN_ON_ONCE(hash->descsize > HASH_MAX_DESCSIZE)) {
+ if (alg->exit_tfm)
+ alg->exit_tfm(hash);
+ return -EINVAL;
+ }
+
return 0;
}
* @export: see struct ahash_alg
* @import: see struct ahash_alg
* @setkey: see struct ahash_alg
+ * @init_tfm: Initialize the cryptographic transformation object.
+ * This function is called only once at the instantiation
+ * time, right after the transformation context was
+ * allocated. In case the cryptographic hardware has
+ * some special requirements which need to be handled
+ * by software, this function shall check for the precise
+ * requirement of the transformation and put any software
+ * fallbacks in place.
+ * @exit_tfm: Deinitialize the cryptographic transformation object.
+ * This is a counterpart to @init_tfm, used to remove
+ * various changes set in @init_tfm.
* @digestsize: see struct ahash_alg
* @statesize: see struct ahash_alg
* @descsize: Size of the operational state for the message digest. This state
int (*import)(struct shash_desc *desc, const void *in);
int (*setkey)(struct crypto_shash *tfm, const u8 *key,
unsigned int keylen);
+ int (*init_tfm)(struct crypto_shash *tfm);
+ void (*exit_tfm)(struct crypto_shash *tfm);
unsigned int descsize;