path: root/crypto/vmac.c
diff options
authorEric Biggers <>2020-07-09 23:20:38 -0700
committerHerbert Xu <>2020-07-16 21:49:08 +1000
commit7bcb2c99f8ed032cfb3f5596b4dccac6b1f501df (patch)
tree7d8e914c0368036db8f1d99a923387833546330a /crypto/vmac.c
parent4688111e78ed432b19c3cd6de545c83c47dc28b3 (diff)
crypto: algapi - use common mechanism for inheriting flags
The flag CRYPTO_ALG_ASYNC is "inherited" in the sense that when a template is instantiated, the template will have CRYPTO_ALG_ASYNC set if any of the algorithms it uses has CRYPTO_ALG_ASYNC set. We'd like to add a second flag (CRYPTO_ALG_ALLOCATES_MEMORY) that gets "inherited" in the same way. This is difficult because the handling of CRYPTO_ALG_ASYNC is hardcoded everywhere. Address this by: - Add CRYPTO_ALG_INHERITED_FLAGS, which contains the set of flags that have these inheritance semantics. - Add crypto_algt_inherited_mask(), for use by template ->create() methods. It returns any of these flags that the user asked to be unset and thus must be passed in the 'mask' to crypto_grab_*(). - Also modify crypto_check_attr_type() to handle computing the 'mask' so that most templates can just use this. - Make crypto_grab_*() propagate these flags to the template instance being created so that templates don't have to do this themselves. Make crypto/simd.c propagate these flags too, since it "wraps" another algorithm, similar to a template. Based on a patch by Mikulas Patocka <> ( Signed-off-by: Eric Biggers <> Signed-off-by: Herbert Xu <>
Diffstat (limited to 'crypto/vmac.c')
1 files changed, 3 insertions, 2 deletions
diff --git a/crypto/vmac.c b/crypto/vmac.c
index 2d906830df96..9b565d1040d6 100644
--- a/crypto/vmac.c
+++ b/crypto/vmac.c
@@ -620,9 +620,10 @@ static int vmac_create(struct crypto_template *tmpl, struct rtattr **tb)
struct shash_instance *inst;
struct crypto_cipher_spawn *spawn;
struct crypto_alg *alg;
+ u32 mask;
int err;
- err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
+ err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, &mask);
if (err)
return err;
@@ -632,7 +633,7 @@ static int vmac_create(struct crypto_template *tmpl, struct rtattr **tb)
spawn = shash_instance_ctx(inst);
err = crypto_grab_cipher(spawn, shash_crypto_instance(inst),
- crypto_attr_alg_name(tb[1]), 0, 0);
+ crypto_attr_alg_name(tb[1]), 0, mask);
if (err)
goto err_free_inst;
alg = crypto_spawn_cipher_alg(spawn);