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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 <herbert@gondor.apana.org.au>
parent b3614763

include/crypto/hash.h

+13 −0
Original line number Diff line number Diff line
@@ -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) 
	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 */