crypto: ahash - Add init_tfm/exit_tfm

This patch adds the type-safe init_tfm/exit_tfm functions to the
ahash interface.  This is meant to replace the unsafe cra_init and
cra_exit interface.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/ahash.c b/crypto/ahash.c
index d84ad92..c2ca631 100644 (file)
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -444,6 +444,14 @@ static int ahash_def_finup(struct ahash_request *req)
        return ahash_def_finup_finish1(req, err);
 }
 
+static void crypto_ahash_exit_tfm(struct crypto_tfm *tfm)
+{
+       struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
+       struct ahash_alg *alg = crypto_ahash_alg(hash);
+
+       alg->exit_tfm(hash);
+}
+
 static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
 {
        struct crypto_ahash *hash = __crypto_ahash_cast(tfm);
@@ -467,7 +475,10 @@ static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
                ahash_set_needkey(hash);
        }
 
-       return 0;
+       if (alg->exit_tfm)
+               tfm->exit = crypto_ahash_exit_tfm;
+
+       return alg->init_tfm ? alg->init_tfm(hash) : 0;
 }
 
 static unsigned int crypto_ahash_extsize(struct crypto_alg *alg)

diff --git a/include/crypto/hash.h b/include/crypto/hash.h
index 0d1b403..a2563a5 100644 (file)
--- a/include/crypto/hash.h
+++ b/include/crypto/hash.h
@@ -123,6 +123,17 @@ struct ahash_request {
  *         data so the transformation can continue from this point onward. No
  *         data processing happens at this point. Driver must not use
  *         req->result.
+ * @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.
  * @halg: see struct hash_alg_common
  */
 struct ahash_alg {
@@ -135,6 +146,8 @@ struct ahash_alg {
        int (*import)(struct ahash_request *req, const void *in);
        int (*setkey)(struct crypto_ahash *tfm, const u8 *key,
                      unsigned int keylen);
+       int (*init_tfm)(struct crypto_ahash *tfm);
+       void (*exit_tfm)(struct crypto_ahash *tfm);
 
        struct hash_alg_common halg;
 };