mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 05:48:40 +00:00
![Herbert Xu](/assets/img/avatar_default.png)
This patch also adds the infrastructure to pick an algorithm based on their type. For example, this allows you to select the encryption algorithm "aes", instead of any algorithm registered under the name "aes". For now this is only accessible internally. Eventually it will be made available through crypto_alloc_tfm. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
280 lines
5.9 KiB
C
280 lines
5.9 KiB
C
/*
|
|
* Cryptographic API for algorithms (i.e., low-level API).
|
|
*
|
|
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*
|
|
* 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)
|
|
* any later version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/list.h>
|
|
#include <linux/module.h>
|
|
#include <linux/string.h>
|
|
|
|
#include "internal.h"
|
|
|
|
static LIST_HEAD(crypto_template_list);
|
|
|
|
void crypto_larval_error(const char *name, u32 type, u32 mask)
|
|
{
|
|
struct crypto_alg *alg;
|
|
|
|
down_read(&crypto_alg_sem);
|
|
alg = __crypto_alg_lookup(name, type, mask);
|
|
up_read(&crypto_alg_sem);
|
|
|
|
if (alg) {
|
|
if (crypto_is_larval(alg)) {
|
|
struct crypto_larval *larval = (void *)alg;
|
|
complete(&larval->completion);
|
|
}
|
|
crypto_mod_put(alg);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_larval_error);
|
|
|
|
static inline int crypto_set_driver_name(struct crypto_alg *alg)
|
|
{
|
|
static const char suffix[] = "-generic";
|
|
char *driver_name = alg->cra_driver_name;
|
|
int len;
|
|
|
|
if (*driver_name)
|
|
return 0;
|
|
|
|
len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
|
|
if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
|
|
return -ENAMETOOLONG;
|
|
|
|
memcpy(driver_name + len, suffix, sizeof(suffix));
|
|
return 0;
|
|
}
|
|
|
|
static int crypto_check_alg(struct crypto_alg *alg)
|
|
{
|
|
if (alg->cra_alignmask & (alg->cra_alignmask + 1))
|
|
return -EINVAL;
|
|
|
|
if (alg->cra_alignmask & alg->cra_blocksize)
|
|
return -EINVAL;
|
|
|
|
if (alg->cra_blocksize > PAGE_SIZE / 8)
|
|
return -EINVAL;
|
|
|
|
if (alg->cra_priority < 0)
|
|
return -EINVAL;
|
|
|
|
return crypto_set_driver_name(alg);
|
|
}
|
|
|
|
static int __crypto_register_alg(struct crypto_alg *alg)
|
|
{
|
|
struct crypto_alg *q;
|
|
int ret = -EEXIST;
|
|
|
|
atomic_set(&alg->cra_refcnt, 1);
|
|
list_for_each_entry(q, &crypto_alg_list, cra_list) {
|
|
if (q == alg)
|
|
goto out;
|
|
if (crypto_is_larval(q) &&
|
|
(!strcmp(alg->cra_name, q->cra_name) ||
|
|
!strcmp(alg->cra_driver_name, q->cra_name))) {
|
|
struct crypto_larval *larval = (void *)q;
|
|
|
|
if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
|
|
continue;
|
|
if (!crypto_mod_get(alg))
|
|
continue;
|
|
larval->adult = alg;
|
|
complete(&larval->completion);
|
|
}
|
|
}
|
|
|
|
list_add(&alg->cra_list, &crypto_alg_list);
|
|
|
|
crypto_notify(CRYPTO_MSG_ALG_REGISTER, alg);
|
|
ret = 0;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int crypto_register_alg(struct crypto_alg *alg)
|
|
{
|
|
int err;
|
|
|
|
err = crypto_check_alg(alg);
|
|
if (err)
|
|
return err;
|
|
|
|
down_write(&crypto_alg_sem);
|
|
err = __crypto_register_alg(alg);
|
|
up_write(&crypto_alg_sem);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_alg);
|
|
|
|
int crypto_unregister_alg(struct crypto_alg *alg)
|
|
{
|
|
int ret = -ENOENT;
|
|
|
|
down_write(&crypto_alg_sem);
|
|
if (likely(!list_empty(&alg->cra_list))) {
|
|
list_del_init(&alg->cra_list);
|
|
ret = 0;
|
|
}
|
|
crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
|
|
up_write(&crypto_alg_sem);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
|
|
if (alg->cra_destroy)
|
|
alg->cra_destroy(alg);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_unregister_alg);
|
|
|
|
int crypto_register_template(struct crypto_template *tmpl)
|
|
{
|
|
struct crypto_template *q;
|
|
int err = -EEXIST;
|
|
|
|
down_write(&crypto_alg_sem);
|
|
|
|
list_for_each_entry(q, &crypto_template_list, list) {
|
|
if (q == tmpl)
|
|
goto out;
|
|
}
|
|
|
|
list_add(&tmpl->list, &crypto_template_list);
|
|
crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
|
|
err = 0;
|
|
out:
|
|
up_write(&crypto_alg_sem);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_template);
|
|
|
|
void crypto_unregister_template(struct crypto_template *tmpl)
|
|
{
|
|
struct crypto_instance *inst;
|
|
struct hlist_node *p, *n;
|
|
struct hlist_head *list;
|
|
|
|
down_write(&crypto_alg_sem);
|
|
|
|
BUG_ON(list_empty(&tmpl->list));
|
|
list_del_init(&tmpl->list);
|
|
|
|
list = &tmpl->instances;
|
|
hlist_for_each_entry(inst, p, list, list) {
|
|
BUG_ON(list_empty(&inst->alg.cra_list));
|
|
list_del_init(&inst->alg.cra_list);
|
|
crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
|
|
}
|
|
|
|
crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
|
|
|
|
up_write(&crypto_alg_sem);
|
|
|
|
hlist_for_each_entry_safe(inst, p, n, list, list) {
|
|
BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
|
|
tmpl->free(inst);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_unregister_template);
|
|
|
|
static struct crypto_template *__crypto_lookup_template(const char *name)
|
|
{
|
|
struct crypto_template *q, *tmpl = NULL;
|
|
|
|
down_read(&crypto_alg_sem);
|
|
list_for_each_entry(q, &crypto_template_list, list) {
|
|
if (strcmp(q->name, name))
|
|
continue;
|
|
if (unlikely(!crypto_tmpl_get(q)))
|
|
continue;
|
|
|
|
tmpl = q;
|
|
break;
|
|
}
|
|
up_read(&crypto_alg_sem);
|
|
|
|
return tmpl;
|
|
}
|
|
|
|
struct crypto_template *crypto_lookup_template(const char *name)
|
|
{
|
|
return try_then_request_module(__crypto_lookup_template(name), name);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_lookup_template);
|
|
|
|
int crypto_register_instance(struct crypto_template *tmpl,
|
|
struct crypto_instance *inst)
|
|
{
|
|
int err = -EINVAL;
|
|
|
|
if (inst->alg.cra_destroy)
|
|
goto err;
|
|
|
|
err = crypto_check_alg(&inst->alg);
|
|
if (err)
|
|
goto err;
|
|
|
|
inst->alg.cra_module = tmpl->module;
|
|
|
|
down_write(&crypto_alg_sem);
|
|
|
|
err = __crypto_register_alg(&inst->alg);
|
|
if (err)
|
|
goto unlock;
|
|
|
|
hlist_add_head(&inst->list, &tmpl->instances);
|
|
inst->tmpl = tmpl;
|
|
|
|
unlock:
|
|
up_write(&crypto_alg_sem);
|
|
|
|
err:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_instance);
|
|
|
|
int crypto_register_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_register(&crypto_chain, nb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_notifier);
|
|
|
|
int crypto_unregister_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_unregister(&crypto_chain, nb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
|
|
|
|
static int __init crypto_algapi_init(void)
|
|
{
|
|
crypto_init_proc();
|
|
return 0;
|
|
}
|
|
|
|
static void __exit crypto_algapi_exit(void)
|
|
{
|
|
crypto_exit_proc();
|
|
}
|
|
|
|
module_init(crypto_algapi_init);
|
|
module_exit(crypto_algapi_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Cryptographic algorithms API");
|