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KEYS: encrypted: use crypto_shash_tfm_digest()

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Instead of manually allocating a 'struct shash_desc' on the stack and
calling crypto_shash_digest(), switch to using the new helper function
crypto_shash_tfm_digest() which does this for us.

Cc: keyrings@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2020-05-01 22:31:21 -07:00 committed by Herbert Xu
parent 75b93c6354
commit bce395eea0
1 changed files with 3 additions and 15 deletions
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18
security/keys/encrypted-keys/encrypted.c
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@ -323,19 +323,6 @@ static struct key *request_user_key(const char *master_desc, const u8 **master_k
return ukey;
}
static int calc_hash(struct crypto_shash *tfm, u8 *digest,
const u8 *buf, unsigned int buflen)
{
SHASH_DESC_ON_STACK(desc, tfm);
int err;
desc->tfm = tfm;
err = crypto_shash_digest(desc, buf, buflen, digest);
shash_desc_zero(desc);
return err;
}
static int calc_hmac(u8 *digest, const u8 *key, unsigned int keylen,
const u8 *buf, unsigned int buflen)
{
@ -351,7 +338,7 @@ static int calc_hmac(u8 *digest, const u8 *key, unsigned int keylen,
err = crypto_shash_setkey(tfm, key, keylen);
if (!err)
err = calc_hash(tfm, digest, buf, buflen);
err = crypto_shash_tfm_digest(tfm, buf, buflen, digest);
crypto_free_shash(tfm);
return err;
}
@ -381,7 +368,8 @@ static int get_derived_key(u8 *derived_key, enum derived_key_type key_type,
memcpy(derived_buf + strlen(derived_buf) + 1, master_key,
master_keylen);
ret = calc_hash(hash_tfm, derived_key, derived_buf, derived_buf_len);
ret = crypto_shash_tfm_digest(hash_tfm, derived_buf, derived_buf_len,
derived_key);
kzfree(derived_buf);
return ret;
}