diff options
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/api.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/crypto/api.c b/crypto/api.c index 1e4692a1347..bc4b7901acd 100644 --- a/crypto/api.c +++ b/crypto/api.c @@ -372,6 +372,66 @@ struct crypto_tfm *crypto_alloc_tfm(const char *name, u32 flags) return tfm; } +/* + * crypto_alloc_base - Locate algorithm and allocate transform + * @alg_name: Name of algorithm + * @type: Type of algorithm + * @mask: Mask for type comparison + * + * crypto_alloc_base() 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. If that fails it will send a query to any loaded crypto manager + * to construct an algorithm on the fly. A refcount is grabbed on the + * algorithm which is then associated with the new transform. + * + * The returned transform is of a non-determinate type. Most people + * should use one of the more specific allocation functions such as + * crypto_alloc_blkcipher. + * + * In case of error the return value is an error pointer. + */ +struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask) +{ + struct crypto_tfm *tfm; + int err; + + for (;;) { + struct crypto_alg *alg; + + alg = crypto_alg_mod_lookup(alg_name, type, mask); + err = PTR_ERR(alg); + tfm = ERR_PTR(err); + if (IS_ERR(alg)) + goto err; + + tfm = __crypto_alloc_tfm(alg, 0); + if (!IS_ERR(tfm)) + break; + + crypto_mod_put(alg); + err = PTR_ERR(tfm); + +err: + if (err != -EAGAIN) + break; + if (signal_pending(current)) { + err = -EINTR; + break; + } + }; + + return tfm; +} +EXPORT_SYMBOL_GPL(crypto_alloc_base); + +/* + * crypto_free_tfm - Free crypto transform + * @tfm: Transform to free + * + * crypto_free_tfm() frees up the transform and any associated resources, + * then drops the refcount on the associated algorithm. + */ void crypto_free_tfm(struct crypto_tfm *tfm) { struct crypto_alg *alg; |