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| author | Eric Biggers <ebiggers@google.com> | 2018-01-03 11:16:30 -0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-01-12 23:03:39 +1100 |
| commit | dc26c17f743aa8e4720a5fda577dde855f2e36f8 (patch) | |
| tree | fcd23cb048b79d5d3a83a0901aae8289da8e46cc /include/crypto | |
| parent | f8d33fac84806eebd2ba31a3136066eeca19255f (diff) | |
| download | linux-dc26c17f743aa8e4720a5fda577dde855f2e36f8.tar.gz linux-dc26c17f743aa8e4720a5fda577dde855f2e36f8.tar.bz2 linux-dc26c17f743aa8e4720a5fda577dde855f2e36f8.zip | |
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 'include/crypto')
| -rw-r--r-- | include/crypto/aead.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/include/crypto/aead.h b/include/crypto/aead.h index 03b97629442c..1e26f790b03f 100644 --- a/include/crypto/aead.h +++ b/include/crypto/aead.h @@ -327,7 +327,12 @@ static inline struct crypto_aead *crypto_aead_reqtfm(struct aead_request *req) */ static inline int crypto_aead_encrypt(struct aead_request *req) { - return crypto_aead_alg(crypto_aead_reqtfm(req))->encrypt(req); + struct crypto_aead *aead = crypto_aead_reqtfm(req); + + if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY) + return -ENOKEY; + + return crypto_aead_alg(aead)->encrypt(req); } /** @@ -356,6 +361,9 @@ static inline int crypto_aead_decrypt(struct aead_request *req) { struct crypto_aead *aead = crypto_aead_reqtfm(req); + if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY) + return -ENOKEY; + if (req->cryptlen < crypto_aead_authsize(aead)) return -EINVAL; |