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ubifs: use crypto_shash_tfm_digest() in ubifs_hmac_wkm()

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Simplify ubifs_hmac_wkm() 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>
Tested-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Eric Biggers 2023-10-28 22:03:55 -07:00 committed by Richard Weinberger
parent 861deac3b0
commit 738fadaa54
1 changed files with 2 additions and 17 deletions
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19
fs/ubifs/auth.c
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@ -507,28 +507,13 @@ out:
*/ */
int ubifs_hmac_wkm(struct ubifs_info *c, u8 *hmac) int ubifs_hmac_wkm(struct ubifs_info *c, u8 *hmac)
{ {
SHASH_DESC_ON_STACK(shash, c->hmac_tfm);
int err;
const char well_known_message[] = "UBIFS"; const char well_known_message[] = "UBIFS";
if (!ubifs_authenticated(c)) if (!ubifs_authenticated(c))
return 0; return 0;
shash->tfm = c->hmac_tfm; return crypto_shash_tfm_digest(c->hmac_tfm, well_known_message,
sizeof(well_known_message) - 1, hmac);
err = crypto_shash_init(shash);
if (err)
return err;
err = crypto_shash_update(shash, well_known_message,
sizeof(well_known_message) - 1);
if (err < 0)
return err;
err = crypto_shash_final(shash, hmac);
if (err)
return err;
return 0;
} }
/* /*