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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 <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2016-01-22 23:17:58 +08:00
parent b361476305
commit e67ffe0af4
1 changed files with 13 additions and 0 deletions
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13
include/crypto/hash.h
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@ -14,6 +14,7 @@
#define _CRYPTO_HASH_H #define _CRYPTO_HASH_H
#include <linux/crypto.h> #include <linux/crypto.h>
#include <linux/string.h>
struct crypto_ahash; struct crypto_ahash;
@ -550,6 +551,12 @@ static inline void ahash_request_free(struct ahash_request *req)
kzfree(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( static inline struct ahash_request *ahash_request_cast(
struct crypto_async_request *req) 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, int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
unsigned int len, u8 *out); 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 */ #endif /* _CRYPTO_HASH_H */