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dm crypt: use crypto_shash_digest() in crypt_iv_tcw_whitening()

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Simplify crypt_iv_tcw_whitening() by using crypto_shash_digest() instead
of an init+update+final sequence.  This should also improve performance.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Eric Biggers 2023-10-28 21:59:23 -07:00 • committed by Mike Snitzer
parent a951104333
commit 6d0ee3b680
1 changed files with 1 additions and 7 deletions
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8
drivers/md/dm-crypt.c
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@ -652,13 +652,7 @@ static int crypt_iv_tcw_whitening(struct crypt_config *cc,
/* calculate crc32 for every 32bit part and xor it */
desc->tfm = tcw->crc32_tfm;
for (i = 0; i < 4; i++) {
r = crypto_shash_init(desc);
if (r)
goto out;
r = crypto_shash_update(desc, &buf[i * 4], 4);
if (r)
goto out;
r = crypto_shash_final(desc, &buf[i * 4]);
r = crypto_shash_digest(desc, &buf[i * 4], 4, &buf[i * 4]);
if (r)
goto out;
}