linux-kernel - [PATCH 1/2] crypto: hash - Add crypto_ahash_has

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Date:	Fri, 8 Jan 2016 21:28:26 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Milan Broz <gmazyland@...il.com>
Cc:	Stephan Mueller <smueller@...onox.de>,
	Dmitry Vyukov <dvyukov@...gle.com>, syzkaller@...glegroups.com,
	davem@...emloft.net, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org, kcc@...gle.com, glider@...gle.com,
	edumazet@...gle.com, sasha.levin@...cle.com, keescook@...gle.com,
	Ondrej Kozina <okozina@...hat.com>
Subject: [PATCH 1/2] crypto: hash - Add crypto_ahash_has_setkey

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>

diff --git a/crypto/ahash.c b/crypto/ahash.c
index 9c1dc8d..d19b523 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -451,6 +451,7 @@ 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;
 
@@ -463,8 +464,10 @@ 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 ecb1e3d..88a27de 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -355,8 +355,10 @@ 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 3d69c93..6361892 100644
--- a/include/crypto/hash.h
+++ b/include/crypto/hash.h
@@ -204,6 +204,7 @@ struct crypto_ahash {
 		      unsigned int keylen);
 
 	unsigned int reqsize;
+	bool has_setkey;
 	struct crypto_tfm base;
 };
 
@@ -375,6 +376,11 @@ 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;
+}
+
 /**
  * crypto_ahash_finup() - update and finalize message digest
  * @req: reference to the ahash_request handle that holds all information
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt