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| author | Eric Biggers <ebiggers@google.com> | 2020-07-09 23:20:38 -0700 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2020-07-16 21:49:08 +1000 |
| commit | 7bcb2c99f8ed032cfb3f5596b4dccac6b1f501df (patch) | |
| tree | 7d8e914c0368036db8f1d99a923387833546330a /crypto/chacha20poly1305.c | |
| parent | 4688111e78ed432b19c3cd6de545c83c47dc28b3 (diff) | |
| download | linux-7bcb2c99f8ed032cfb3f5596b4dccac6b1f501df.tar.bz2 | |
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 <mpatocka@redhat.com>
(https://lore.kernel.org/r/alpine.LRH.2.02.2006301414580.30526@file01.intranet.prod.int.rdu2.redhat.com).
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/chacha20poly1305.c')
| -rw-r--r-- | crypto/chacha20poly1305.c | 14 |
1 files changed, 3 insertions, 11 deletions
diff --git a/crypto/chacha20poly1305.c b/crypto/chacha20poly1305.c index ccaea5cb66d1..97bbb135e9a6 100644 --- a/crypto/chacha20poly1305.c +++ b/crypto/chacha20poly1305.c @@ -555,7 +555,6 @@ static void chachapoly_free(struct aead_instance *inst) static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb, const char *name, unsigned int ivsize) { - struct crypto_attr_type *algt; u32 mask; struct aead_instance *inst; struct chachapoly_instance_ctx *ctx; @@ -566,14 +565,9 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb, if (ivsize > CHACHAPOLY_IV_SIZE) return -EINVAL; - algt = crypto_get_attr_type(tb); - if (IS_ERR(algt)) - return PTR_ERR(algt); - - if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) - return -EINVAL; - - mask = crypto_requires_sync(algt->type, algt->mask); + err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask); + if (err) + return err; inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); if (!inst) @@ -613,8 +607,6 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb, poly->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) goto err_free_inst; - inst->alg.base.cra_flags = (chacha->base.cra_flags | - poly->base.cra_flags) & CRYPTO_ALG_ASYNC; inst->alg.base.cra_priority = (chacha->base.cra_priority + poly->base.cra_priority) / 2; inst->alg.base.cra_blocksize = 1; |