Add helper function to determine if a given synchronous hash is supported.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
---
  crypto/shash.c        | 6 ++++++
  include/crypto/hash.h | 2 ++
  2 files changed, 8 insertions(+)

diff --git a/crypto/shash.c b/crypto/shash.c
index 0a0a50cb694f..4c88e63b3350 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c

@@ -521,6 +521,12 @@ struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
  }
  EXPORT_SYMBOL_GPL(crypto_alloc_shash);
  
+int crypto_has_shash(const char *alg_name, u32 type, u32 mask)
+{
+	return crypto_type_has_alg(alg_name, &crypto_shash_type, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_has_shash);
+
  static int shash_prepare_alg(struct shash_alg *alg)
  {
  	struct crypto_alg *base = &alg->base;

diff --git a/include/crypto/hash.h b/include/crypto/hash.h
index f140e4643949..f5841992dc9b 100644
--- a/include/crypto/hash.h
+++ b/include/crypto/hash.h

@@ -718,6 +718,8 @@ static inline void ahash_request_set_crypt(struct ahash_request *req,
  struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
  					u32 mask);
  
+int crypto_has_shash(const char *alg_name, u32 type, u32 mask);
+
  static inline struct crypto_tfm *crypto_shash_tfm(struct crypto_shash *tfm)
  {
  	return &tfm->base;