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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>
#include "internal.h"
static LIST_HEAD(crypto_alg_list);
static DECLARE_RWSEM(crypto_alg_sem);
static unsigned crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask)
{
return alg->cra_type->ctxsize(alg, type, mask);
}
unsigned crypto_alg_extsize(struct crypto_alg *alg)
{
return alg->cra_ctxsize;
}
struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
{
struct crypto_alg *alg;
down_read(&crypto_alg_sem);
list_for_each_entry(alg, &crypto_alg_list, cra_list)
if (!((alg->cra_flags ^ type) & mask) &&
!strcmp(alg->cra_name, name))
goto found;
alg = ERR_PTR(-ENOENT);
found:
up_read(&crypto_alg_sem);
return alg;
}
static void crypto_exit_ops(struct crypto_tfm *tfm)
{
if (tfm->exit)
tfm->exit(tfm);
}
static struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg,
u32 type, u32 mask)
{
struct crypto_tfm *tfm = NULL;
unsigned tfm_size;
int err = -ENOMEM;
tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
tfm = kzalloc(tfm_size, GFP_KERNEL);
if (tfm == NULL)
return ERR_PTR(-ENOMEM);
tfm->__crt_alg = alg;
err = alg->cra_type->init(tfm, type, mask);
if (err)
goto out_free_tfm;
if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
goto cra_init_failed;
return tfm;
cra_init_failed:
crypto_exit_ops(tfm);
out_free_tfm:
kfree(tfm);
return ERR_PTR(err);
}
struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask)
{
struct crypto_alg *alg;
struct crypto_tfm *tfm;
alg = crypto_alg_mod_lookup(alg_name, type, mask);
if (IS_ERR(alg)) {
fprintf(stderr, "unknown cipher %s\n", alg_name);
return ERR_CAST(alg);
}
tfm = __crypto_alloc_tfm(alg, type, mask);
if (IS_ERR(tfm))
return tfm;
return tfm;
}
static void *crypto_create_tfm(struct crypto_alg *alg,
const struct crypto_type *frontend)
{
struct crypto_tfm *tfm = NULL;
unsigned tfmsize;
unsigned total;
void *mem;
int err = -ENOMEM;
tfmsize = frontend->tfmsize;
total = tfmsize + sizeof(*tfm) + frontend->extsize(alg);
mem = kzalloc(total, GFP_KERNEL);
if (!mem)
goto out_err;
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:
kfree(mem);
out_err:
mem = ERR_PTR(err);
out:
return mem;
}
static struct crypto_alg *crypto_find_alg(const char *alg_name,
const struct crypto_type *frontend,
u32 type, u32 mask)
{
if (frontend) {
type &= frontend->maskclear;
mask &= frontend->maskclear;
type |= frontend->type;
mask |= frontend->maskset;
}
return crypto_alg_mod_lookup(alg_name, type, mask);
}
void *crypto_alloc_tfm(const char *alg_name,
const struct crypto_type *frontend,
u32 type, u32 mask)
{
struct crypto_alg *alg;
void *tfm;
alg = crypto_find_alg(alg_name, frontend, type, mask);
if (IS_ERR(alg))
return ERR_CAST(alg);
tfm = crypto_create_tfm(alg, frontend);
if (IS_ERR(tfm))
return tfm;
return tfm;
}
void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm)
{
struct crypto_alg *alg;
if (unlikely(!mem))
return;
alg = tfm->__crt_alg;
if (!tfm->exit && alg->cra_exit)
alg->cra_exit(tfm);
crypto_exit_ops(tfm);
kzfree(mem);
}
int crypto_register_alg(struct crypto_alg *alg)
{
INIT_LIST_HEAD(&alg->cra_users);
down_write(&crypto_alg_sem);
list_add(&alg->cra_list, &crypto_alg_list);
up_write(&crypto_alg_sem);
return 0;
}
/* skcipher: */
static int crypto_skcipher_init_tfm(struct crypto_tfm *tfm)
{
struct crypto_skcipher *skcipher = __crypto_skcipher_cast(tfm);
struct skcipher_alg *alg = crypto_skcipher_alg(skcipher);
skcipher->setkey = alg->setkey;
skcipher->encrypt = alg->encrypt;
skcipher->decrypt = alg->decrypt;
skcipher->ivsize = alg->ivsize;
skcipher->keysize = alg->max_keysize;
if (alg->init)
return alg->init(skcipher);
return 0;
}
static const struct crypto_type crypto_skcipher_type2 = {
.extsize = crypto_alg_extsize,
.init_tfm = crypto_skcipher_init_tfm,
.maskclear = ~CRYPTO_ALG_TYPE_MASK,
.maskset = CRYPTO_ALG_TYPE_BLKCIPHER_MASK,
.tfmsize = offsetof(struct crypto_skcipher, base),
};
struct crypto_skcipher *crypto_alloc_skcipher(const char *alg_name,
u32 type, u32 mask)
{
return crypto_alloc_tfm(alg_name, &crypto_skcipher_type2, type, mask);
}
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