crypto: shash - Add shash_register_instance

This patch adds shash_register_instance so that shash instances
can be registered without bypassing the shash checks applied to
normal algorithms.

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

1 files changed, 25 insertions, 1 deletions

diff --git a/crypto/shash.c b/crypto/shash.c
index 21bcff6be5b0..3d242425d692 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -480,7 +480,7 @@ struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
 }
 EXPORT_SYMBOL_GPL(crypto_alloc_shash);
 
-int crypto_register_shash(struct shash_alg *alg)
+static int shash_prepare_alg(struct shash_alg *alg)
 {
         struct crypto_alg *base = &alg->base;
 
@@ -491,6 +491,17 @@ int crypto_register_shash(struct shash_alg *alg)
         base->cra_type = &crypto_shash_type;
         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
         base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
+        return 0;
+}
+
+int crypto_register_shash(struct shash_alg *alg)
+{
+        struct crypto_alg *base = &alg->base;
+        int err;
+
+        err = shash_prepare_alg(alg);
+        if (err)
+                return err;
 
         return crypto_register_alg(base);
 }
@@ -502,6 +513,19 @@ int crypto_unregister_shash(struct shash_alg *alg)
 }
 EXPORT_SYMBOL_GPL(crypto_unregister_shash);
 
+int shash_register_instance(struct crypto_template *tmpl,
+                            struct shash_instance *inst)
+{
+        int err;
+
+        err = shash_prepare_alg(&inst->alg);
+        if (err)
+                return err;
+
+        return crypto_register_instance(tmpl, shash_crypto_instance(inst));
+}
+EXPORT_SYMBOL_GPL(shash_register_instance);
+
 void shash_free_instance(struct crypto_instance *inst)
 {
         crypto_drop_spawn(crypto_instance_ctx(inst));