*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
+ * Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
*/
mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);
type &= mask;
- alg = try_then_request_module(crypto_alg_lookup(name, type, mask),
- name);
+ alg = crypto_alg_lookup(name, type, mask);
+ if (!alg) {
+ request_module("%s", name);
+
+ if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask &
+ CRYPTO_ALG_NEED_FALLBACK))
+ request_module("%s-all", name);
+
+ alg = crypto_alg_lookup(name, type, mask);
+ }
+
if (alg)
return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg;
struct crypto_alg *larval;
int ok;
- if (!(mask & CRYPTO_ALG_TESTED)) {
+ if (!((type | mask) & CRYPTO_ALG_TESTED)) {
type |= CRYPTO_ALG_TESTED;
mask |= CRYPTO_ALG_TESTED;
}
switch (crypto_tfm_alg_type(tfm)) {
case CRYPTO_ALG_TYPE_CIPHER:
return crypto_init_cipher_ops(tfm);
-
- case CRYPTO_ALG_TYPE_DIGEST:
- if ((mask & CRYPTO_ALG_TYPE_HASH_MASK) !=
- CRYPTO_ALG_TYPE_HASH_MASK)
- return crypto_init_digest_ops_async(tfm);
- else
- return crypto_init_digest_ops(tfm);
case CRYPTO_ALG_TYPE_COMPRESS:
return crypto_init_compress_ops(tfm);
-
+
default:
break;
}
-
+
BUG();
return -EINVAL;
}
case CRYPTO_ALG_TYPE_CIPHER:
crypto_exit_cipher_ops(tfm);
break;
-
- case CRYPTO_ALG_TYPE_DIGEST:
- crypto_exit_digest_ops(tfm);
- break;
-
+
case CRYPTO_ALG_TYPE_COMPRESS:
crypto_exit_compress_ops(tfm);
break;
-
+
default:
BUG();
-
}
}
case CRYPTO_ALG_TYPE_CIPHER:
len += crypto_cipher_ctxsize(alg);
break;
-
- case CRYPTO_ALG_TYPE_DIGEST:
- len += crypto_digest_ctxsize(alg);
- break;
-
+
case CRYPTO_ALG_TYPE_COMPRESS:
len += crypto_compress_ctxsize(alg);
break;
* @type: Type of algorithm
* @mask: Mask for type comparison
*
+ * This function should not be used by new algorithm types.
+ * Plesae use crypto_alloc_tfm instead.
+ *
* 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
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(crypto_alloc_base);
-
+
+void *crypto_create_tfm(struct crypto_alg *alg,
+ const struct crypto_type *frontend)
+{
+ char *mem;
+ struct crypto_tfm *tfm = NULL;
+ unsigned int tfmsize;
+ unsigned int total;
+ int err = -ENOMEM;
+
+ tfmsize = frontend->tfmsize;
+ total = tfmsize + sizeof(*tfm) + frontend->extsize(alg);
+
+ mem = kzalloc(total, GFP_KERNEL);
+ if (mem == NULL)
+ goto out_err;
+
+ tfm = (struct crypto_tfm *)(mem + tfmsize);
+ tfm->__crt_alg = alg;
+
+ err = frontend->init_tfm(tfm);
+ if (err)
+ goto out_free_tfm;
+
+ if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
+ goto cra_init_failed;
+
+ goto out;
+
+cra_init_failed:
+ crypto_exit_ops(tfm);
+out_free_tfm:
+ if (err == -EAGAIN)
+ crypto_shoot_alg(alg);
+ kfree(mem);
+out_err:
+ mem = ERR_PTR(err);
+out:
+ return mem;
+}
+EXPORT_SYMBOL_GPL(crypto_create_tfm);
+
+struct crypto_alg *crypto_find_alg(const char *alg_name,
+ const struct crypto_type *frontend,
+ u32 type, u32 mask)
+{
+ struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask) =
+ crypto_alg_mod_lookup;
+
+ if (frontend) {
+ type &= frontend->maskclear;
+ mask &= frontend->maskclear;
+ type |= frontend->type;
+ mask |= frontend->maskset;
+
+ if (frontend->lookup)
+ lookup = frontend->lookup;
+ }
+
+ return lookup(alg_name, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_find_alg);
+
/*
- * crypto_free_tfm - Free crypto transform
+ * crypto_alloc_tfm - Locate algorithm and allocate transform
+ * @alg_name: Name of algorithm
+ * @frontend: Frontend algorithm type
+ * @type: Type of algorithm
+ * @mask: Mask for type comparison
+ *
+ * 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. 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.
+ */
+void *crypto_alloc_tfm(const char *alg_name,
+ const struct crypto_type *frontend, u32 type, u32 mask)
+{
+ void *tfm;
+ int err;
+
+ for (;;) {
+ struct crypto_alg *alg;
+
+ alg = crypto_find_alg(alg_name, frontend, type, mask);
+ if (IS_ERR(alg)) {
+ err = PTR_ERR(alg);
+ goto err;
+ }
+
+ tfm = crypto_create_tfm(alg, frontend);
+ if (!IS_ERR(tfm))
+ return tfm;
+
+ crypto_mod_put(alg);
+ err = PTR_ERR(tfm);
+
+err:
+ if (err != -EAGAIN)
+ break;
+ if (signal_pending(current)) {
+ err = -EINTR;
+ break;
+ }
+ }
+
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
+
+/*
+ * crypto_destroy_tfm - Free crypto transform
+ * @mem: Start of tfm slab
* @tfm: Transform to free
*
- * crypto_free_tfm() frees up the transform and any associated resources,
+ * This function frees up the transform and any associated resources,
* then drops the refcount on the associated algorithm.
*/
-void crypto_free_tfm(struct crypto_tfm *tfm)
+void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm)
{
struct crypto_alg *alg;
- int size;
- if (unlikely(!tfm))
+ if (unlikely(!mem))
return;
alg = tfm->__crt_alg;
- size = sizeof(*tfm) + alg->cra_ctxsize;
if (!tfm->exit && alg->cra_exit)
alg->cra_exit(tfm);
crypto_exit_ops(tfm);
crypto_mod_put(alg);
- memset(tfm, 0, size);
- kfree(tfm);
+ kzfree(mem);
}
-
-EXPORT_SYMBOL_GPL(crypto_free_tfm);
+EXPORT_SYMBOL_GPL(crypto_destroy_tfm);
int crypto_has_alg(const char *name, u32 type, u32 mask)
{
int ret = 0;
struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);
-
+
if (!IS_ERR(alg)) {
crypto_mod_put(alg);
ret = 1;
}
-
+
return ret;
}
EXPORT_SYMBOL_GPL(crypto_has_alg);
Code Review / linux-2.6.git / blobdiff