From 85cc424381804386d991f81e08b4933ca1f04214 Mon Sep 17 00:00:00 2001
From: Hannes Reinecke <hare@suse.de>
Date: Mon, 27 Jun 2022 11:51:57 +0200
Subject: [PATCH] crypto: add crypto_has_shash()

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>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 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;