From cd6ed77ad5d223dc6299fb58f62e0f5267f7e2ba Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers@google.com>
Date: Wed, 3 Jan 2018 11:16:22 -0800
Subject: [PATCH] crypto: hash - introduce crypto_hash_alg_has_setkey()
Git-commit: cd6ed77ad5d223dc6299fb58f62e0f5267f7e2ba
Patch-mainline: v4.16-rc1
References: bsc#1051510

Templates that use an shash spawn can use crypto_shash_alg_has_setkey()
to determine whether the underlying algorithm requires a key or not.
But there was no corresponding function for ahash spawns.  Add it.

Note that the new function actually has to support both shash and ahash
algorithms, since the ahash API can be used with either.

Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 crypto/ahash.c                 |   11 +++++++++++
 include/crypto/internal/hash.h |    2 ++
 2 files changed, 13 insertions(+)

--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -626,5 +626,16 @@ struct hash_alg_common *ahash_attr_alg(s
 }
 EXPORT_SYMBOL_GPL(ahash_attr_alg);
 
+bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
+{
+	struct crypto_alg *alg = &halg->base;
+
+	if (alg->cra_type != &crypto_ahash_type)
+		return crypto_shash_alg_has_setkey(__crypto_shash_alg(alg));
+
+	return __crypto_ahash_alg(alg)->setkey != NULL;
+}
+EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
--- a/include/crypto/internal/hash.h
+++ b/include/crypto/internal/hash.h
@@ -88,6 +88,8 @@ static inline bool crypto_shash_alg_has_
 	return alg->setkey != shash_no_setkey;
 }
 
+bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg);
+
 int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,
 			    struct hash_alg_common *alg,
 			    struct crypto_instance *inst);