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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: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2023-04-13 14:24:21 +08:00
parent ed3630b83e
commit 8538e60d36
1 changed files with 15 additions and 0 deletions
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15
crypto/hmac.c
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@ -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;