From e67ffe0af4d450e95e5f9bb7d081500e30777857 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Fri, 22 Jan 2016 23:17:58 +0800 Subject: 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: Herbert Xu --- include/crypto/hash.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'include/crypto') diff --git a/include/crypto/hash.h b/include/crypto/hash.h index 6361892ea737..aef819247fe8 100644 --- a/include/crypto/hash.h +++ b/include/crypto/hash.h @@ -14,6 +14,7 @@ #define _CRYPTO_HASH_H #include +#include struct crypto_ahash; @@ -550,6 +551,12 @@ static inline void ahash_request_free(struct ahash_request *req) kzfree(req); } +static inline void ahash_request_zero(struct ahash_request *req) +{ + memzero_explicit(req, sizeof(*req) + + crypto_ahash_reqsize(crypto_ahash_reqtfm(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) +{ + memzero_explicit(desc, + sizeof(*desc) + crypto_shash_descsize(desc->tfm)); +} + #endif /* _CRYPTO_HASH_H */ -- cgit v1.2.3