[CRYPTO] api: Allow algorithm lookup by type

This patch also adds the infrastructure to pick an algorithm based on
their type.  For example, this allows you to select the encryption
algorithm "aes", instead of any algorithm registered under the name
"aes".  For now this is only accessible internally.  Eventually it
will be made available through crypto_alloc_tfm.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/crypto/algapi.c b/crypto/algapi.c
index f0df85fc1f50..acea250677c0 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -21,12 +21,12 @@
 
 static LIST_HEAD(crypto_template_list);
 
-void crypto_larval_error(const char *name)
+void crypto_larval_error(const char *name, u32 type, u32 mask)
 {
         struct crypto_alg *alg;
 
         down_read(&crypto_alg_sem);
-        alg = __crypto_alg_lookup(name);
+        alg = __crypto_alg_lookup(name, type, mask);
         up_read(&crypto_alg_sem);
 
         if (alg) {
@@ -87,6 +87,8 @@ static int __crypto_register_alg(struct crypto_alg *alg)
                      !strcmp(alg->cra_driver_name, q->cra_name))) {
                         struct crypto_larval *larval = (void *)q;
 
+                        if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
+                                continue;
                         if (!crypto_mod_get(alg))
                                 continue;
                         larval->adult = alg;