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authorEric Biggers <ebiggers@google.com>2018-01-03 11:16:26 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-02-16 20:23:00 +0100
commit8d906d183bce4b0eb812e5766ee5016f16dc201c (patch)
tree67cdfe88772e5fb12e70fe3228a8af8c82ca5bcf /arch/x86/crypto
parentb806c0cc4c73511be382da411effdbb96f15919a (diff)
crypto: hash - annotate algorithms taking optional key
commit a208fa8f33031b9e0aba44c7d1b7e68eb0cbd29e upstream. 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. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86/crypto')
-rw-r--r--arch/x86/crypto/crc32-pclmul_glue.c1
-rw-r--r--arch/x86/crypto/crc32c-intel_glue.c1
2 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/crypto/crc32-pclmul_glue.c b/arch/x86/crypto/crc32-pclmul_glue.c
index 27226df3f7d8..c8d9cdacbf10 100644
--- a/arch/x86/crypto/crc32-pclmul_glue.c
+++ b/arch/x86/crypto/crc32-pclmul_glue.c
@@ -162,6 +162,7 @@ static struct shash_alg alg = {
.cra_name = "crc32",
.cra_driver_name = "crc32-pclmul",
.cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_ctxsize = sizeof(u32),
.cra_module = THIS_MODULE,
diff --git a/arch/x86/crypto/crc32c-intel_glue.c b/arch/x86/crypto/crc32c-intel_glue.c
index c194d5717ae5..5773e1161072 100644
--- a/arch/x86/crypto/crc32c-intel_glue.c
+++ b/arch/x86/crypto/crc32c-intel_glue.c
@@ -226,6 +226,7 @@ static struct shash_alg alg = {
.cra_name = "crc32c",
.cra_driver_name = "crc32c-intel",
.cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_ctxsize = sizeof(u32),
.cra_module = THIS_MODULE,