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authorEric Biggers <ebiggers@google.com>2018-01-03 11:16:26 -0800
committerHerbert Xu <herbert@gondor.apana.org.au>2018-01-12 23:03:35 +1100
commita208fa8f33031b9e0aba44c7d1b7e68eb0cbd29e (patch)
treee700ec232c2831a0471ce788552c69db8cc6c949 /arch/arm64/crypto
parenta16e772e664b9a261424107784804cffc8894977 (diff)
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 'arch/arm64/crypto')
-rw-r--r--arch/arm64/crypto/crc32-ce-glue.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/crypto/crc32-ce-glue.c b/arch/arm64/crypto/crc32-ce-glue.c
index 624f4137918c..34b4e3d46aab 100644
--- a/arch/arm64/crypto/crc32-ce-glue.c
+++ b/arch/arm64/crypto/crc32-ce-glue.c
@@ -185,6 +185,7 @@ static struct shash_alg crc32_pmull_algs[] = { {
.base.cra_name = "crc32",
.base.cra_driver_name = "crc32-arm64-ce",
.base.cra_priority = 200,
+ .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.base.cra_blocksize = 1,
.base.cra_module = THIS_MODULE,
}, {
@@ -200,6 +201,7 @@ static struct shash_alg crc32_pmull_algs[] = { {
.base.cra_name = "crc32c",
.base.cra_driver_name = "crc32c-arm64-ce",
.base.cra_priority = 200,
+ .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.base.cra_blocksize = 1,
.base.cra_module = THIS_MODULE,
} };