mirror of
https://github.com/adulau/aha.git
synced 2024-12-28 03:36:19 +00:00
cce9e06d10
The crypto API is made up of the part facing users such as IPsec and the low-level part which is used by cryptographic entities such as algorithms. This patch splits out the latter so that the two APIs are more clearly delineated. As a bonus the low-level API can now be modularised if all algorithms are built as modules. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
118 lines
2.4 KiB
C
118 lines
2.4 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/module.h>
|
|
#include <linux/string.h>
|
|
|
|
#include "internal.h"
|
|
|
|
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;
|
|
}
|
|
|
|
int crypto_register_alg(struct crypto_alg *alg)
|
|
{
|
|
int ret;
|
|
struct crypto_alg *q;
|
|
|
|
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;
|
|
|
|
ret = crypto_set_driver_name(alg);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
|
|
down_write(&crypto_alg_sem);
|
|
|
|
list_for_each_entry(q, &crypto_alg_list, cra_list) {
|
|
if (q == alg) {
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
list_add(&alg->cra_list, &crypto_alg_list);
|
|
atomic_set(&alg->cra_refcnt, 1);
|
|
out:
|
|
up_write(&crypto_alg_sem);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_alg);
|
|
|
|
int crypto_unregister_alg(struct crypto_alg *alg)
|
|
{
|
|
int ret = -ENOENT;
|
|
struct crypto_alg *q;
|
|
|
|
down_write(&crypto_alg_sem);
|
|
list_for_each_entry(q, &crypto_alg_list, cra_list) {
|
|
if (alg == q) {
|
|
list_del(&alg->cra_list);
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
out:
|
|
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);
|
|
|
|
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");
|