linux-kernel - [PATCH 3.12 064/142] crypto: hash

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Date:	Wed, 24 Feb 2016 11:04:19 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 064/142] crypto: hash - Add crypto_ahash_has_setkey

From: Herbert Xu <herbert@...dor.apana.org.au>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit a5596d6332787fd383b3b5427b41f94254430827 upstream.

This patch adds a way for ahash users to determine whether a key
is required by a crypto_ahash transform.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 crypto/ahash.c        | 5 ++++-
 crypto/shash.c        | 4 +++-
 include/crypto/hash.h | 7 +++++++
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/crypto/ahash.c b/crypto/ahash.c
index 857ae2b2a2a2..b246858ca032 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -369,6 +369,7 @@ static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
 	struct ahash_alg *alg = crypto_ahash_alg(hash);
 
 	hash->setkey = ahash_nosetkey;
+	hash->has_setkey = false;
 	hash->export = ahash_no_export;
 	hash->import = ahash_no_import;
 
@@ -381,8 +382,10 @@ static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
 	hash->finup = alg->finup ?: ahash_def_finup;
 	hash->digest = alg->digest;
 
-	if (alg->setkey)
+	if (alg->setkey) {
 		hash->setkey = alg->setkey;
+		hash->has_setkey = true;
+	}
 	if (alg->export)
 		hash->export = alg->export;
 	if (alg->import)
diff --git a/crypto/shash.c b/crypto/shash.c
index 929058a68561..8e4256aae963 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -354,8 +354,10 @@ int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
 	crt->finup = shash_async_finup;
 	crt->digest = shash_async_digest;
 
-	if (alg->setkey)
+	if (alg->setkey) {
 		crt->setkey = shash_async_setkey;
+		crt->has_setkey = true;
+	}
 	if (alg->export)
 		crt->export = shash_async_export;
 	if (alg->import)
diff --git a/include/crypto/hash.h b/include/crypto/hash.h
index 26cb1eb16f4c..4bdd795dfaf9 100644
--- a/include/crypto/hash.h
+++ b/include/crypto/hash.h
@@ -94,6 +94,7 @@ struct crypto_ahash {
 		      unsigned int keylen);
 
 	unsigned int reqsize;
+	bool has_setkey;
 	struct crypto_tfm base;
 };
 
@@ -181,6 +182,12 @@ static inline void *ahash_request_ctx(struct ahash_request *req)
 
 int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
 			unsigned int keylen);
+
+static inline bool crypto_ahash_has_setkey(struct crypto_ahash *tfm)
+{
+	return tfm->has_setkey;
+}
+
 int crypto_ahash_finup(struct ahash_request *req);
 int crypto_ahash_final(struct ahash_request *req);
 int crypto_ahash_digest(struct ahash_request *req);
-- 
2.7.1