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nvme-auth: use crypto_shash_tfm_digest()

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Simplify nvme_auth_augmented_challenge() by using
crypto_shash_tfm_digest() instead of an alloc+init+update+final
sequence.  This should also improve performance.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Eric Biggers
2023-10-28 22:00:40 -07:00
committed by Keith Busch
parent d2f51b3516
commit 744eac783f
1 changed files with 2 additions and 21 deletions
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23
drivers/nvme/common/auth.c
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@@ -341,7 +341,6 @@ int nvme_auth_augmented_challenge(u8 hmac_id, u8 *skey, size_t skey_len,
u8 *challenge, u8 *aug, size_t hlen)
{
struct crypto_shash *tfm;
struct shash_desc *desc;
u8 *hashed_key;
const char *hmac_name;
int ret;
@@ -369,29 +368,11 @@ int nvme_auth_augmented_challenge(u8 hmac_id, u8 *skey, size_t skey_len,
goto out_free_key;
}
desc = kmalloc(sizeof(struct shash_desc) + crypto_shash_descsize(tfm),
GFP_KERNEL);
if (!desc) {
ret = -ENOMEM;
goto out_free_hash;
}
desc->tfm = tfm;
ret = crypto_shash_setkey(tfm, hashed_key, hlen);
if (ret)
goto out_free_desc;
goto out_free_hash;
ret = crypto_shash_init(desc);
if (ret)
goto out_free_desc;
ret = crypto_shash_update(desc, challenge, hlen);
if (ret)
goto out_free_desc;
ret = crypto_shash_final(desc, aug);
out_free_desc:
kfree_sensitive(desc);
ret = crypto_shash_tfm_digest(tfm, challenge, hlen, aug);
out_free_hash:
crypto_free_shash(tfm);
out_free_key: