path: root/include/linux/crypto.h
diff options
authorHerbert Xu <herbert@gondor.apana.org.au>2006-07-30 11:53:01 +1000
committerHerbert Xu <herbert@gondor.apana.org.au>2006-09-21 11:41:50 +1000
commit6d7d684d635ac5a345f075015f2c84169c111c6a (patch)
tree9a1b397fe8db3c14cc69880aba747e50c1a1faa2 /include/linux/crypto.h
parent65b75c36f4e8422602826c75c803136e0da94122 (diff)
[CRYPTO] api: Added crypto_alloc_base
Up until now all crypto transforms have been of the same type, struct crypto_tfm, regardless of whether they are ciphers, digests, or other types. As a result of that, we check the types at run-time before each crypto operation. This is rather cumbersome. We could instead use different C types for each crypto type to ensure that the correct types are used at compile time. That is, we would have crypto_cipher/crypto_digest instead of just crypto_tfm. The appropriate type would then be required for the actual operations such as crypto_digest_digest. Now that we have the type/mask fields when looking up algorithms, it is easy to request for an algorithm of the precise type that the user wants. However, crypto_alloc_tfm currently does not expose these new attributes. This patch introduces the function crypto_alloc_base which will carry these new parameters. It will be renamed to crypto_alloc_tfm once all existing users have been converted. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/linux/crypto.h')
1 files changed, 3 insertions, 11 deletions
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 530dc4bf363c..6847ab0ea30e 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -194,8 +194,8 @@ static inline int crypto_alg_available(const char *name, u32 flags)
* Transforms: user-instantiated objects which encapsulate algorithms
- * and core processing logic. Managed via crypto_alloc_tfm() and
- * crypto_free_tfm(), as well as the various helpers below.
+ * and core processing logic. Managed via crypto_alloc_*() and
+ * crypto_free_*(), as well as the various helpers below.
struct cipher_tfm {
@@ -278,16 +278,8 @@ struct crypto_attr_alg {
* Transform user interface.
- * crypto_alloc_tfm() will first attempt to locate an already loaded algorithm.
- * If that fails and the kernel supports dynamically loadable modules, it
- * will then attempt to load a module of the same name or alias. A refcount
- * is grabbed on the algorithm which is then associated with the new transform.
- *
- * crypto_free_tfm() frees up the transform and any associated resources,
- * then drops the refcount on the associated algorithm.
- */
struct crypto_tfm *crypto_alloc_tfm(const char *alg_name, u32 tfm_flags);
+struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask);
void crypto_free_tfm(struct crypto_tfm *tfm);

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