Commit 8538e60d authored by Herbert Xu's avatar Herbert Xu
Browse files

crypto: hmac - Add support for cloning 



Allow hmac to be cloned.  The underlying hash can be used directly
with a reference count.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent ed3630b8

crypto/hmac.c

+15 −0
Original line number Diff line number Diff line
@@ -160,6 +160,20 @@ static int hmac_init_tfm(struct crypto_shash *parent) 
	return 0;

}



static int hmac_clone_tfm(struct crypto_shash *dst, struct crypto_shash *src)

{

	struct hmac_ctx *sctx = hmac_ctx(src);

	struct hmac_ctx *dctx = hmac_ctx(dst);

	struct crypto_shash *hash;



	hash = crypto_clone_shash(sctx->hash);

	if (IS_ERR(hash))

		return PTR_ERR(hash);



	dctx->hash = hash;

	return 0;

}



static void hmac_exit_tfm(struct crypto_shash *parent)

{

	struct hmac_ctx *ctx = hmac_ctx(parent);
@@ -227,6 +241,7 @@ static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb) 
	inst->alg.import = hmac_import;

	inst->alg.setkey = hmac_setkey;

	inst->alg.init_tfm = hmac_init_tfm;

	inst->alg.clone_tfm = hmac_clone_tfm;

	inst->alg.exit_tfm = hmac_exit_tfm;



	inst->free = shash_free_singlespawn_instance;