Commit e67ffe0a authored by Herbert Xu's avatar Herbert Xu
Browse files

crypto: hash - Add helpers to zero stack request/descriptor

As the size of an ahash_request or shash_desc is variable, it's
awkward to zero them explicitly.  This patch adds helpers to do
that which should be used when they are created on the stack.
Signed-off-by: default avatarHerbert Xu <>
parent b3614763
......@@ -14,6 +14,7 @@
#define _CRYPTO_HASH_H
#include <linux/crypto.h>
#include <linux/string.h>
struct crypto_ahash;
......@@ -550,6 +551,12 @@ static inline void ahash_request_free(struct ahash_request *req)
static inline void ahash_request_zero(struct ahash_request *req)
memzero_explicit(req, sizeof(*req) +
static inline struct ahash_request *ahash_request_cast(
struct crypto_async_request *req)
......@@ -872,4 +879,10 @@ int crypto_shash_final(struct shash_desc *desc, u8 *out);
int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out);
static inline void shash_desc_zero(struct shash_desc *desc)
sizeof(*desc) + crypto_shash_descsize(desc->tfm));
#endif /* _CRYPTO_HASH_H */
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