/*

* 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;

/*

* We may encounter an unregistered instance here, since

* an instance's spawns are set up prior to the instance

* being registered. An unregistered instance will have

* NULL ->cra_users.next, since ->cra_users isn't

* properly initialized until registration. But an

* unregistered instance cannot have any users, so treat

* it the same as ->cra_users being empty.

*/

if (spawns->next == NULL)

break;

}

} 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;

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);

static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)

{

for (; size; size--)

*a++ ^= *b++;

}

void crypto_xor(u8 *dst, const u8 *src, unsigned int size)

{

u32 *a = (u32 *)dst;

u32 *b = (u32 *)src;

for (; size >= 4; size -= 4)

*a++ ^= *b++;