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crypto: shash - allow essiv and hmac to use OPTIONAL_KEY algorithms 

The essiv and hmac templates refuse to use any hash algorithm that has a
->setkey() function, which includes not just algorithms that always need
a key, but also algorithms that optionally take a key.

Previously the only optionally-keyed hash algorithms in the crypto API
were non-cryptographic algorithms like crc32, so this didn't really
matter.  But that's changed with BLAKE2 support being added.  BLAKE2
should work with essiv and hmac, just like any other cryptographic hash.

Fix this by allowing the use of both algorithms without a ->setkey()
function and algorithms that have the OPTIONAL_KEY flag set.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2019-11-29 11:35:22 -08:00 committed by Herbert Xu
parent 89873b4411
commit c288178954
4 changed files with 10 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
crypto/essiv.c
View File

@ -442,7 +442,7 @@ static bool essiv_supported_algorithms(const char *essiv_cipher_name,
if (ivsize != alg->cra_blocksize)
goto out;
if (crypto_shash_alg_has_setkey(hash_alg))
if (crypto_shash_alg_needs_key(hash_alg))
goto out;
ret = true;

4
crypto/hmac.c
View File

@ -185,9 +185,9 @@ static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb)
return PTR_ERR(salg);
alg = &salg->base;
/* The underlying hash algorithm must be unkeyed */
/* The underlying hash algorithm must not require a key */
err = -EINVAL;
if (crypto_shash_alg_has_setkey(salg))
if (crypto_shash_alg_needs_key(salg))
goto out_put_alg;
ds = salg->digestsize;

3
crypto/shash.c
View File

@ -50,8 +50,7 @@ static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
{
if (crypto_shash_alg_has_setkey(alg) &&
!(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
if (crypto_shash_alg_needs_key(alg))
crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
}

6
include/crypto/internal/hash.h
View File

@ -85,6 +85,12 @@ static inline bool crypto_shash_alg_has_setkey(struct shash_alg *alg)
return alg->setkey != shash_no_setkey;
}
static inline bool crypto_shash_alg_needs_key(struct shash_alg *alg)
{
return crypto_shash_alg_has_setkey(alg) &&
!(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY);
}
bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg);
int crypto_init_ahash_spawn(struct crypto_ahash_spawn *spawn,