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authorEric Biggers <ebiggers@google.com>2020-01-02 19:58:51 -0800
committerHerbert Xu <herbert@gondor.apana.org.au>2020-01-09 11:30:55 +0800
commit0764ac28763fdb533809090005956fcd3123fb60 (patch)
tree81348b71b4abd6ba2498aa18ec57911a6cb4d805 /include/crypto
parentcrypto: ahash - introduce crypto_grab_ahash() (diff)
downloadwireguard-linux-0764ac28763fdb533809090005956fcd3123fb60.tar.xz
wireguard-linux-0764ac28763fdb533809090005956fcd3123fb60.zip
crypto: cipher - introduce crypto_cipher_spawn and crypto_grab_cipher()
Currently, "cipher" (single-block cipher) spawns are usually initialized by using crypto_get_attr_alg() to look up the algorithm, then calling crypto_init_spawn(). In one case, crypto_grab_spawn() is used directly. The former way is different from how skcipher, aead, and akcipher spawns are initialized (they use crypto_grab_*()), and for no good reason. This difference introduces unnecessary complexity. The crypto_grab_*() functions used to have some problems, like not holding a reference to the algorithm and requiring the caller to initialize spawn->base.inst. But those problems are fixed now. Also, the cipher spawns are not strongly typed; e.g., the API requires that the user manually specify the flags CRYPTO_ALG_TYPE_CIPHER and CRYPTO_ALG_TYPE_MASK. Though the "cipher" algorithm type itself isn't yet strongly typed, we can start by making the spawns strongly typed. So, let's introduce a new 'struct crypto_cipher_spawn', and functions crypto_grab_cipher() and crypto_drop_cipher() to grab and drop them. Later patches will convert all cipher spawns to use these, then make crypto_spawn_cipher() take 'struct crypto_cipher_spawn' as well, instead of a bare 'struct crypto_spawn' as it currently does. 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/algapi.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index 2779c8d34ba9..7705387f9459 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -208,6 +208,31 @@ static inline void *crypto_instance_ctx(struct crypto_instance *inst)
return inst->__ctx;
}
+struct crypto_cipher_spawn {
+ struct crypto_spawn base;
+};
+
+static inline int crypto_grab_cipher(struct crypto_cipher_spawn *spawn,
+ struct crypto_instance *inst,
+ const char *name, u32 type, u32 mask)
+{
+ type &= ~CRYPTO_ALG_TYPE_MASK;
+ type |= CRYPTO_ALG_TYPE_CIPHER;
+ mask |= CRYPTO_ALG_TYPE_MASK;
+ return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
+}
+
+static inline void crypto_drop_cipher(struct crypto_cipher_spawn *spawn)
+{
+ crypto_drop_spawn(&spawn->base);
+}
+
+static inline struct crypto_alg *crypto_spawn_cipher_alg(
+ struct crypto_cipher_spawn *spawn)
+{
+ return spawn->base.alg;
+}
+
static inline struct crypto_cipher *crypto_spawn_cipher(
struct crypto_spawn *spawn)
{