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remarkable-linux/crypto/algapi.c
Ard Biesheuvel db91af0fbe crypto: algapi - make crypto_xor() and crypto_inc() alignment agnostic 
Instead of unconditionally forcing 4 byte alignment for all generic
chaining modes that rely on crypto_xor() or crypto_inc() (which may
result in unnecessary copying of data when the underlying hardware
can perform unaligned accesses efficiently), make those functions
deal with unaligned input explicitly, but only if the Kconfig symbol
HAVE_EFFICIENT_UNALIGNED_ACCESS is set. This will allow us to drop
the alignmasks from the CBC, CMAC, CTR, CTS, PCBC and SEQIV drivers.

For crypto_inc(), this simply involves making the 4-byte stride
conditional on HAVE_EFFICIENT_UNALIGNED_ACCESS being set, given that
it typically operates on 16 byte buffers.

For crypto_xor(), an algorithm is implemented that simply runs through
the input using the largest strides possible if unaligned accesses are
allowed. If they are not, an optimal sequence of memory accesses is
emitted that takes the relative alignment of the input buffers into
account, e.g., if the relative misalignment of dst and src is 4 bytes,
the entire xor operation will be completed using 4 byte loads and stores
(modulo unaligned bits at the start and end). Note that all expressions
involving misalign are simply eliminated by the compiler when
HAVE_EFFICIENT_UNALIGNED_ACCESS is defined.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2017-02-11 17:52:28 +08:00

1064 lines
22 KiB
C
Raw Blame History

/*
* 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/err.h>
#include <linux/errno.h>
#include <linux/fips.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "internal.h"
static LIST_HEAD(crypto_template_list);
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 inline void crypto_check_module_sig(struct module *mod)
{
if (fips_enabled && mod && !module_sig_ok(mod))
panic("Module %s signature verification failed in FIPS mode\n",
module_name(mod));
}
static int crypto_check_alg(struct crypto_alg *alg)
{
crypto_check_module_sig(alg->cra_module);
if (alg->cra_alignmask & (alg->cra_alignmask + 1))
return -EINVAL;
if (alg->cra_blocksize > PAGE_SIZE / 8)
return -EINVAL;
if (alg->cra_priority < 0)
return -EINVAL;
atomic_set(&alg->cra_refcnt, 1);
return crypto_set_driver_name(alg);
}
static void crypto_free_instance(struct crypto_instance *inst)
{
if (!inst->alg.cra_type->free) {
inst->tmpl->free(inst);
return;
}
inst->alg.cra_type->free(inst);
}
static void crypto_destroy_instance(struct crypto_alg *alg)
{
struct crypto_instance *inst = (void *)alg;
struct crypto_template *tmpl = inst->tmpl;
crypto_free_instance(inst);
crypto_tmpl_put(tmpl);
}
static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
struct list_head *stack,
struct list_head *top,
struct list_head *secondary_spawns)
{
struct crypto_spawn *spawn, *n;
spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
if (!spawn)
return NULL;
n = list_next_entry(spawn, list);
if (spawn->alg && &n->list != stack && !n->alg)
n->alg = (n->list.next == stack) ? alg :
&list_next_entry(n, list)->inst->alg;
list_move(&spawn->list, secondary_spawns);
return &n->list == stack ? top : &n->inst->alg.cra_users;
}
static void crypto_remove_instance(struct crypto_instance *inst,
struct list_head *list)
{
struct crypto_template *tmpl = inst->tmpl;
if (crypto_is_dead(&inst->alg))
return;
inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
if (hlist_unhashed(&inst->list))
return;
if (!tmpl || !crypto_tmpl_get(tmpl))
return;
crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
list_move(&inst->alg.cra_list, list);
hlist_del(&inst->list);
inst->alg.cra_destroy = crypto_destroy_instance;
BUG_ON(!list_empty(&inst->alg.cra_users));
}
void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
struct crypto_alg *nalg)
{
u32 new_type = (nalg ?: alg)->cra_flags;
struct crypto_spawn *spawn, *n;
LIST_HEAD(secondary_spawns);
struct list_head *spawns;
LIST_HEAD(stack);
LIST_HEAD(top);
spawns = &alg->cra_users;
list_for_each_entry_safe(spawn, n, spawns, list) {
if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
continue;
list_move(&spawn->list, &top);
}
spawns = &top;
do {
while (!list_empty(spawns)) {
struct crypto_instance *inst;
spawn = list_first_entry(spawns, struct crypto_spawn,
list);
inst = spawn->inst;
BUG_ON(&inst->alg == alg);
list_move(&spawn->list, &stack);
if (&inst->alg == nalg)
break;
spawn->alg = NULL;
spawns = &inst->alg.cra_users;
}
} while ((spawns = crypto_more_spawns(alg, &stack, &top,
&secondary_spawns)));
list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
if (spawn->alg)
list_move(&spawn->list, &spawn->alg->cra_users);
else
crypto_remove_instance(spawn->inst, list);
}
}
EXPORT_SYMBOL_GPL(crypto_remove_spawns);
static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
{
struct crypto_alg *q;
struct crypto_larval *larval;
int ret = -EAGAIN;
if (crypto_is_dead(alg))
goto err;
INIT_LIST_HEAD(&alg->cra_users);
/* No cheating! */
alg->cra_flags &= ~CRYPTO_ALG_TESTED;
ret = -EEXIST;
list_for_each_entry(q, &crypto_alg_list, cra_list) {
if (q == alg)
goto err;
if (crypto_is_moribund(q))
continue;
if (crypto_is_larval(q)) {
if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
goto err;
continue;
}
if (!strcmp(q->cra_driver_name, alg->cra_name) ||
!strcmp(q->cra_name, alg->cra_driver_name))
goto err;
}
larval = crypto_larval_alloc(alg->cra_name,
alg->cra_flags | CRYPTO_ALG_TESTED, 0);
if (IS_ERR(larval))
goto out;
ret = -ENOENT;
larval->adult = crypto_mod_get(alg);
if (!larval->adult)
goto free_larval;
atomic_set(&larval->alg.cra_refcnt, 1);
memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
CRYPTO_MAX_ALG_NAME);
larval->alg.cra_priority = alg->cra_priority;
list_add(&alg->cra_list, &crypto_alg_list);
list_add(&larval->alg.cra_list, &crypto_alg_list);
out:
return larval;
free_larval:
kfree(larval);
err:
larval = ERR_PTR(ret);
goto out;
}
void crypto_alg_tested(const char *name, int err)
{
struct crypto_larval *test;
struct crypto_alg *alg;
struct crypto_alg *q;
LIST_HEAD(list);
down_write(&crypto_alg_sem);
list_for_each_entry(q, &crypto_alg_list, cra_list) {
if (crypto_is_moribund(q) || !crypto_is_larval(q))
continue;
test = (struct crypto_larval *)q;
if (!strcmp(q->cra_driver_name, name))
goto found;
}
printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
goto unlock;
found:
q->cra_flags |= CRYPTO_ALG_DEAD;
alg = test->adult;
if (err || list_empty(&alg->cra_list))
goto complete;
alg->cra_flags |= CRYPTO_ALG_TESTED;
list_for_each_entry(q, &crypto_alg_list, cra_list) {
if (q == alg)
continue;
if (crypto_is_moribund(q))
continue;
if (crypto_is_larval(q)) {
struct crypto_larval *larval = (void *)q;
/*
* Check to see if either our generic name or
* specific name can satisfy the name requested
* by the larval entry q.
*/
if (strcmp(alg->cra_name, q->cra_name) &&
strcmp(alg->cra_driver_name, q->cra_name))
continue;
if (larval->adult)
continue;
if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
continue;
if (!crypto_mod_get(alg))
continue;
larval->adult = alg;
continue;
}
if (strcmp(alg->cra_name, q->cra_name))
continue;
if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
q->cra_priority > alg->cra_priority)
continue;
crypto_remove_spawns(q, &list, alg);
}
complete:
complete_all(&test->completion);
unlock:
up_write(&crypto_alg_sem);
crypto_remove_final(&list);
}
EXPORT_SYMBOL_GPL(crypto_alg_tested);
void crypto_remove_final(struct list_head *list)
{
struct crypto_alg *alg;
struct crypto_alg *n;
list_for_each_entry_safe(alg, n, list, cra_list) {
list_del_init(&alg->cra_list);
crypto_alg_put(alg);
}
}
EXPORT_SYMBOL_GPL(crypto_remove_final);
static void crypto_wait_for_test(struct crypto_larval *larval)
{
int err;
err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
if (err != NOTIFY_STOP) {
if (WARN_ON(err != NOTIFY_DONE))
goto out;
crypto_alg_tested(larval->alg.cra_driver_name, 0);
}
err = wait_for_completion_killable(&larval->completion);
WARN_ON(err);
out:
crypto_larval_kill(&larval->alg);
}
int crypto_register_alg(struct crypto_alg *alg)
{
struct crypto_larval *larval;
int err;
alg->cra_flags &= ~CRYPTO_ALG_DEAD;
err = crypto_check_alg(alg);
if (err)
return err;
down_write(&crypto_alg_sem);
larval = __crypto_register_alg(alg);
up_write(&crypto_alg_sem);
if (IS_ERR(larval))
return PTR_ERR(larval);
crypto_wait_for_test(larval);
return 0;
}
EXPORT_SYMBOL_GPL(crypto_register_alg);
static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
{
if (unlikely(list_empty(&alg->cra_list)))
return -ENOENT;
alg->cra_flags |= CRYPTO_ALG_DEAD;
crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
list_del_init(&alg->cra_list);
crypto_remove_spawns(alg, list, NULL);
return 0;
}
int crypto_unregister_alg(struct crypto_alg *alg)
{
int ret;
LIST_HEAD(list);
down_write(&crypto_alg_sem);
ret = crypto_remove_alg(alg, &list);
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);
crypto_remove_final(&list);
return 0;
}
EXPORT_SYMBOL_GPL(crypto_unregister_alg);
int crypto_register_algs(struct crypto_alg *algs, int count)
{
int i, ret;
for (i = 0; i < count; i++) {
ret = crypto_register_alg(&algs[i]);
if (ret)
goto err;
}
return 0;
err:
for (--i; i >= 0; --i)
crypto_unregister_alg(&algs[i]);
return ret;
}
EXPORT_SYMBOL_GPL(crypto_register_algs);
int crypto_unregister_algs(struct crypto_alg *algs, int count)
{
int i, ret;
for (i = 0; i < count; i++) {
ret = crypto_unregister_alg(&algs[i]);
if (ret)
pr_err("Failed to unregister %s %s: %d\n",
algs[i].cra_driver_name, algs[i].cra_name, ret);
}
return 0;
}
EXPORT_SYMBOL_GPL(crypto_unregister_algs);
int crypto_register_template(struct crypto_template *tmpl)
{
struct crypto_template *q;
int err = -EEXIST;
down_write(&crypto_alg_sem);
crypto_check_module_sig(tmpl->module);
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 *n;
struct hlist_head *list;
LIST_HEAD(users);
down_write(&crypto_alg_sem);
BUG_ON(list_empty(&tmpl->list));
list_del_init(&tmpl->list);
list = &tmpl->instances;
hlist_for_each_entry(inst, list, list) {
int err = crypto_remove_alg(&inst->alg, &users);
BUG_ON(err);
}
crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
up_write(&crypto_alg_sem);
hlist_for_each_entry_safe(inst, n, list, list) {
BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
crypto_free_instance(inst);
}
crypto_remove_final(&users);
}
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),
"crypto-%s", name);
}
EXPORT_SYMBOL_GPL(crypto_lookup_template);
int crypto_register_instance(struct crypto_template *tmpl,
struct crypto_instance *inst)
{
struct crypto_larval *larval;
int err;
err = crypto_check_alg(&inst->alg);
if (err)
return err;
inst->alg.cra_module = tmpl->module;
inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
if (unlikely(!crypto_mod_get(&inst->alg)))
return -EAGAIN;
down_write(&crypto_alg_sem);
larval = __crypto_register_alg(&inst->alg);
if (IS_ERR(larval))
goto unlock;
hlist_add_head(&inst->list, &tmpl->instances);
inst->tmpl = tmpl;
unlock:
up_write(&crypto_alg_sem);
err = PTR_ERR(larval);
if (IS_ERR(larval))
goto err;
crypto_wait_for_test(larval);
/* Remove instance if test failed */
if (!(inst->alg.cra_flags & CRYPTO_ALG_TESTED))
crypto_unregister_instance(inst);
err = 0;
err:
crypto_mod_put(&inst->alg);
return err;
}
EXPORT_SYMBOL_GPL(crypto_register_instance);
int crypto_unregister_instance(struct crypto_instance *inst)
{
LIST_HEAD(list);
down_write(&crypto_alg_sem);
crypto_remove_spawns(&inst->alg, &list, NULL);
crypto_remove_instance(inst, &list);
up_write(&crypto_alg_sem);
crypto_remove_final(&list);
return 0;
}
EXPORT_SYMBOL_GPL(crypto_unregister_instance);
int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
struct crypto_instance *inst, u32 mask)
{
int err = -EAGAIN;
spawn->inst = inst;
spawn->mask = mask;
down_write(&crypto_alg_sem);
if (!crypto_is_moribund(alg)) {
list_add(&spawn->list, &alg->cra_users);
spawn->alg = alg;
err = 0;
}
up_write(&crypto_alg_sem);
return err;
}
EXPORT_SYMBOL_GPL(crypto_init_spawn);
int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
struct crypto_instance *inst,
const struct crypto_type *frontend)
{
int err = -EINVAL;
if ((alg->cra_flags ^ frontend->type) & frontend->maskset)
goto out;
spawn->frontend = frontend;
err = crypto_init_spawn(spawn, alg, inst, frontend->maskset);
out:
return err;
}
EXPORT_SYMBOL_GPL(crypto_init_spawn2);
int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
u32 type, u32 mask)
{
struct crypto_alg *alg;
int err;
alg = crypto_find_alg(name, spawn->frontend, type, mask);
if (IS_ERR(alg))
return PTR_ERR(alg);
err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
crypto_mod_put(alg);
return err;
}
EXPORT_SYMBOL_GPL(crypto_grab_spawn);
void crypto_drop_spawn(struct crypto_spawn *spawn)
{
if (!spawn->alg)
return;
down_write(&crypto_alg_sem);
list_del(&spawn->list);
up_write(&crypto_alg_sem);
}
EXPORT_SYMBOL_GPL(crypto_drop_spawn);
static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
{
struct crypto_alg *alg;
struct crypto_alg *alg2;
down_read(&crypto_alg_sem);
alg = spawn->alg;
alg2 = alg;
if (alg2)
alg2 = crypto_mod_get(alg2);
up_read(&crypto_alg_sem);
if (!alg2) {
if (alg)
crypto_shoot_alg(alg);
return ERR_PTR(-EAGAIN);
}
return alg;
}
struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
u32 mask)
{
struct crypto_alg *alg;
struct crypto_tfm *tfm;
alg = crypto_spawn_alg(spawn);
if (IS_ERR(alg))
return ERR_CAST(alg);
tfm = ERR_PTR(-EINVAL);
if (unlikely((alg->cra_flags ^ type) & mask))
goto out_put_alg;
tfm = __crypto_alloc_tfm(alg, type, mask);
if (IS_ERR(tfm))
goto out_put_alg;
return tfm;
out_put_alg:
crypto_mod_put(alg);
return tfm;
}
EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
void *crypto_spawn_tfm2(struct crypto_spawn *spawn)
{
struct crypto_alg *alg;
struct crypto_tfm *tfm;
alg = crypto_spawn_alg(spawn);
if (IS_ERR(alg))
return ERR_CAST(alg);
tfm = crypto_create_tfm(alg, spawn->frontend);
if (IS_ERR(tfm))
goto out_put_alg;
return tfm;
out_put_alg:
crypto_mod_put(alg);
return tfm;
}
EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
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);
struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
{
struct rtattr *rta = tb[0];
struct crypto_attr_type *algt;
if (!rta)
return ERR_PTR(-ENOENT);
if (RTA_PAYLOAD(rta) < sizeof(*algt))
return ERR_PTR(-EINVAL);
if (rta->rta_type != CRYPTOA_TYPE)
return ERR_PTR(-EINVAL);
algt = RTA_DATA(rta);
return algt;
}
EXPORT_SYMBOL_GPL(crypto_get_attr_type);
int crypto_check_attr_type(struct rtattr **tb, u32 type)
{
struct crypto_attr_type *algt;
algt = crypto_get_attr_type(tb);
if (IS_ERR(algt))
return PTR_ERR(algt);
if ((algt->type ^ type) & algt->mask)
return -EINVAL;
return 0;
}
EXPORT_SYMBOL_GPL(crypto_check_attr_type);
const char *crypto_attr_alg_name(struct rtattr *rta)
{
struct crypto_attr_alg *alga;
if (!rta)
return ERR_PTR(-ENOENT);
if (RTA_PAYLOAD(rta) < sizeof(*alga))
return ERR_PTR(-EINVAL);
if (rta->rta_type != CRYPTOA_ALG)
return ERR_PTR(-EINVAL);
alga = RTA_DATA(rta);
alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
return alga->name;
}
EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
const struct crypto_type *frontend,
u32 type, u32 mask)
{
const char *name;
name = crypto_attr_alg_name(rta);
if (IS_ERR(name))
return ERR_CAST(name);
return crypto_find_alg(name, frontend, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_attr_alg2);
int crypto_attr_u32(struct rtattr *rta, u32 *num)
{
struct crypto_attr_u32 *nu32;
if (!rta)
return -ENOENT;
if (RTA_PAYLOAD(rta) < sizeof(*nu32))
return -EINVAL;
if (rta->rta_type != CRYPTOA_U32)
return -EINVAL;
nu32 = RTA_DATA(rta);
*num = nu32->num;
return 0;
}
EXPORT_SYMBOL_GPL(crypto_attr_u32);
int crypto_inst_setname(struct crypto_instance *inst, const char *name,
struct crypto_alg *alg)
{
if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
return -ENAMETOOLONG;
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
return -ENAMETOOLONG;
return 0;
}
EXPORT_SYMBOL_GPL(crypto_inst_setname);
void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
unsigned int head)
{
struct crypto_instance *inst;
char *p;
int err;
p = kzalloc(head + sizeof(*inst) + sizeof(struct crypto_spawn),
GFP_KERNEL);
if (!p)
return ERR_PTR(-ENOMEM);
inst = (void *)(p + head);
err = crypto_inst_setname(inst, name, alg);
if (err)
goto err_free_inst;
return p;
err_free_inst:
kfree(p);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(crypto_alloc_instance2);
struct crypto_instance *crypto_alloc_instance(const char *name,
struct crypto_alg *alg)
{
struct crypto_instance *inst;
struct crypto_spawn *spawn;
int err;
inst = crypto_alloc_instance2(name, alg, 0);
if (IS_ERR(inst))
goto out;
spawn = crypto_instance_ctx(inst);
err = crypto_init_spawn(spawn, alg, inst,
CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
if (err)
goto err_free_inst;
return inst;
err_free_inst:
kfree(inst);
inst = ERR_PTR(err);
out:
return inst;
}
EXPORT_SYMBOL_GPL(crypto_alloc_instance);
void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
{
INIT_LIST_HEAD(&queue->list);
queue->backlog = &queue->list;
queue->qlen = 0;
queue->max_qlen = max_qlen;
}
EXPORT_SYMBOL_GPL(crypto_init_queue);
int crypto_enqueue_request(struct crypto_queue *queue,
struct crypto_async_request *request)
{
int err = -EINPROGRESS;
if (unlikely(queue->qlen >= queue->max_qlen)) {
err = -EBUSY;
if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
goto out;
if (queue->backlog == &queue->list)
queue->backlog = &request->list;
}
queue->qlen++;
list_add_tail(&request->list, &queue->list);
out:
return err;
}
EXPORT_SYMBOL_GPL(crypto_enqueue_request);
struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
{
struct list_head *request;
if (unlikely(!queue->qlen))
return NULL;
queue->qlen--;
if (queue->backlog != &queue->list)
queue->backlog = queue->backlog->next;
request = queue->list.next;
list_del(request);
return list_entry(request, struct crypto_async_request, list);
}
EXPORT_SYMBOL_GPL(crypto_dequeue_request);
int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
{
struct crypto_async_request *req;
list_for_each_entry(req, &queue->list, list) {
if (req->tfm == tfm)
return 1;
}
return 0;
}
EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
static inline void crypto_inc_byte(u8 *a, unsigned int size)
{
u8 *b = (a + size);
u8 c;
for (; size; size--) {
c = *--b + 1;
*b = c;
if (c)
break;
}
}
void crypto_inc(u8 *a, unsigned int size)
{
__be32 *b = (__be32 *)(a + size);
u32 c;
if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
!((unsigned long)b & (__alignof__(*b) - 1)))
for (; size >= 4; size -= 4) {
c = be32_to_cpu(*--b) + 1;
*b = cpu_to_be32(c);
if (c)
return;
}
crypto_inc_byte(a, size);
}
EXPORT_SYMBOL_GPL(crypto_inc);
void __crypto_xor(u8 *dst, const u8 *src, unsigned int len)
{
int relalign = 0;
if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
int size = sizeof(unsigned long);
int d = ((unsigned long)dst ^ (unsigned long)src) & (size - 1);
relalign = d ? 1 << __ffs(d) : size;
/*
* If we care about alignment, process as many bytes as
* needed to advance dst and src to values whose alignments
* equal their relative alignment. This will allow us to
* process the remainder of the input using optimal strides.
*/
while (((unsigned long)dst & (relalign - 1)) && len > 0) {
*dst++ ^= *src++;
len--;
}
}
while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
*(u64 *)dst ^= *(u64 *)src;
dst += 8;
src += 8;
len -= 8;
}
while (len >= 4 && !(relalign & 3)) {
*(u32 *)dst ^= *(u32 *)src;
dst += 4;
src += 4;
len -= 4;
}
while (len >= 2 && !(relalign & 1)) {
*(u16 *)dst ^= *(u16 *)src;
dst += 2;
src += 2;
len -= 2;
}
while (len--)
*dst++ ^= *src++;
}
EXPORT_SYMBOL_GPL(__crypto_xor);
unsigned int crypto_alg_extsize(struct crypto_alg *alg)
{
return alg->cra_ctxsize +
(alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
}
EXPORT_SYMBOL_GPL(crypto_alg_extsize);
int crypto_type_has_alg(const char *name, const struct crypto_type *frontend,
u32 type, u32 mask)
{
int ret = 0;
struct crypto_alg *alg = crypto_find_alg(name, frontend, type, mask);
if (!IS_ERR(alg)) {
crypto_mod_put(alg);
ret = 1;
}
return ret;
}
EXPORT_SYMBOL_GPL(crypto_type_has_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");
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