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authorEric Biggers <ebiggers@google.com>2018-01-03 22:16:30 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2018-01-12 15:03:39 +0300
commitdc26c17f743aa8e4720a5fda577dde855f2e36f8 (patch)
treefcd23cb048b79d5d3a83a0901aae8289da8e46cc /crypto/aead.c
parentf8d33fac84806eebd2ba31a3136066eeca19255f (diff)
downloadlinux-dc26c17f743aa8e4720a5fda577dde855f2e36f8.tar.xz
crypto: aead - prevent using AEADs without setting key
Similar to what was done for the hash API, update the AEAD API to track whether each transform has been keyed, and reject encryption/decryption if a key is needed but one hasn't been set. This isn't quite as important as the equivalent fix for the hash API because AEADs always require a key, so are unlikely to be used without one. Still, tracking the key will prevent accidental unkeyed use. algif_aead also had to track the key anyway, so the new flag replaces that and slightly simplifies the algif_aead implementation. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/aead.c')
-rw-r--r--crypto/aead.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/crypto/aead.c b/crypto/aead.c
index fe00cbd7243d..60b3bbe973e7 100644
--- a/crypto/aead.c
+++ b/crypto/aead.c
@@ -54,11 +54,18 @@ int crypto_aead_setkey(struct crypto_aead *tfm,
const u8 *key, unsigned int keylen)
{
unsigned long alignmask = crypto_aead_alignmask(tfm);
+ int err;
if ((unsigned long)key & alignmask)
- return setkey_unaligned(tfm, key, keylen);
+ err = setkey_unaligned(tfm, key, keylen);
+ else
+ err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
+
+ if (err)
+ return err;
- return crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
+ crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
+ return 0;
}
EXPORT_SYMBOL_GPL(crypto_aead_setkey);
@@ -93,6 +100,8 @@ static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
struct crypto_aead *aead = __crypto_aead_cast(tfm);
struct aead_alg *alg = crypto_aead_alg(aead);
+ crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY);
+
aead->authsize = alg->maxauthsize;
if (alg->exit)