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/*
* 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/device.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/rwsem.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <crypto/algapi.h>
static LIST_HEAD(crypto_alg_list);
static DECLARE_RWSEM(crypto_alg_sem);
struct crypto_type {
};
int crypto_register_alg(struct crypto_alg *alg)
{
down_write(&crypto_alg_sem);
list_add(&alg->cra_list, &crypto_alg_list);
up_write(&crypto_alg_sem);
return 0;
}
static void *crypto_alloc_tfm(const char *name,
const struct crypto_type *type)
{
struct crypto_alg *alg;
down_read(&crypto_alg_sem);
list_for_each_entry(alg, &crypto_alg_list, cra_list)
if (alg->cra_type == type && !strcmp(alg->cra_name, name))
goto found;
alg = ERR_PTR(-ENOENT);
found:
up_read(&crypto_alg_sem);
if (IS_ERR(alg))
return ERR_CAST(alg);
return alg->alloc_tfm() ?: ERR_PTR(-ENOMEM);
}
/* skcipher: */
static const struct crypto_type crypto_skcipher_type2 = {
};
struct crypto_skcipher *crypto_alloc_skcipher(const char *name,
u32 type, u32 mask)
{
return crypto_alloc_tfm(name, &crypto_skcipher_type2);
}
int crypto_register_skcipher(struct skcipher_alg *alg)
{
alg->base.cra_type = &crypto_skcipher_type2;
return crypto_register_alg(&alg->base);
}
/* shash: */
#include <crypto/hash.h>
static int shash_finup(struct shash_desc *desc, const u8 *data,
unsigned len, u8 *out)
{
return crypto_shash_update(desc, data, len) ?:
crypto_shash_final(desc, out);
}
static int shash_digest(struct shash_desc *desc, const u8 *data,
unsigned len, u8 *out)
{
return crypto_shash_init(desc) ?:
crypto_shash_finup(desc, data, len, out);
}
static const struct crypto_type crypto_shash_type = {
};
struct crypto_shash *crypto_alloc_shash(const char *name,
u32 type, u32 mask)
{
return crypto_alloc_tfm(name, &crypto_shash_type);
}
int crypto_register_shash(struct shash_alg *alg)
{
alg->base.cra_type = &crypto_shash_type;
if (!alg->finup)
alg->finup = shash_finup;
if (!alg->digest)
alg->digest = shash_digest;
return crypto_register_alg(&alg->base);
}
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