diff options
author | Eric Biggers <ebiggers@google.com> | 2018-01-03 11:16:26 -0800 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-01-12 23:03:35 +1100 |
commit | a208fa8f33031b9e0aba44c7d1b7e68eb0cbd29e (patch) | |
tree | e700ec232c2831a0471ce788552c69db8cc6c949 /crypto/mcryptd.c | |
parent | a16e772e664b9a261424107784804cffc8894977 (diff) | |
download | linux-a208fa8f33031b9e0aba44c7d1b7e68eb0cbd29e.tar.bz2 |
crypto: hash - annotate algorithms taking optional key
We need to consistently enforce that keyed hashes cannot be used without
setting the key. To do this we need a reliable way to determine whether
a given hash algorithm is keyed or not. AF_ALG currently does this by
checking for the presence of a ->setkey() method. However, this is
actually slightly broken because the CRC-32 algorithms implement
->setkey() but can also be used without a key. (The CRC-32 "key" is not
actually a cryptographic key but rather represents the initial state.
If not overridden, then a default initial state is used.)
Prepare to fix this by introducing a flag CRYPTO_ALG_OPTIONAL_KEY which
indicates that the algorithm has a ->setkey() method, but it is not
required to be called. Then set it on all the CRC-32 algorithms.
The same also applies to the Adler-32 implementation in Lustre.
Also, the cryptd and mcryptd templates have to pass through the flag
from their underlying algorithm.
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/mcryptd.c')
-rw-r--r-- | crypto/mcryptd.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/crypto/mcryptd.c b/crypto/mcryptd.c index ace346b976b3..fe5129d6ff4e 100644 --- a/crypto/mcryptd.c +++ b/crypto/mcryptd.c @@ -516,10 +516,9 @@ static int mcryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb, if (err) goto out_free_inst; - type = CRYPTO_ALG_ASYNC; - if (alg->cra_flags & CRYPTO_ALG_INTERNAL) - type |= CRYPTO_ALG_INTERNAL; - inst->alg.halg.base.cra_flags = type; + inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC | + (alg->cra_flags & (CRYPTO_ALG_INTERNAL | + CRYPTO_ALG_OPTIONAL_KEY)); inst->alg.halg.digestsize = halg->digestsize; inst->alg.halg.statesize = halg->statesize; |