在 2023/10/29 13:03, Eric Biggers 写道:
From: Eric Biggers <ebiggers@xxxxxxxxxx>
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@xxxxxxxxxx>
---
fs/ubifs/auth.c | 19 ++-----------------
1 file changed, 2 insertions(+), 17 deletions(-)
Tested-by: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
Time cost of ubifs_hmac_wkm(unit: us):
Before: 381~1634
After:278~1539
diff --git a/fs/ubifs/auth.c b/fs/ubifs/auth.c
index e564d5ff8781..4add4a4f0720 100644
--- a/fs/ubifs/auth.c
+++ b/fs/ubifs/auth.c
@@ -501,42 +501,27 @@ int __ubifs_shash_copy_state(const struct ubifs_info *c, struct shash_desc *src,
*
* This function creates a HMAC of a well known message. This is used
* to check if the provided key is suitable to authenticate a UBIFS
* image. This is only a convenience to the user to provide a better
* error message when the wrong key is provided.
*
* This function returns 0 for success or a negative error code otherwise.
*/
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";
if (!ubifs_authenticated(c))
return 0;
- shash->tfm = c->hmac_tfm;
-
- 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;
+ return crypto_shash_tfm_digest(c->hmac_tfm, well_known_message,
+ sizeof(well_known_message) - 1, hmac);
}
/*
* ubifs_hmac_zero - test if a HMAC is zero
* @c: UBIFS file-system description object
* @hmac: the HMAC to test
*
* This function tests if a HMAC is zero and returns true if it is
* and false otherwise.
*/
base-commit: 2af9b20dbb39f6ebf9b9b6c090271594627d818e
