Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux
[linux-2.6.git] / crypto / algapi.c
index 232b37d..9d4a9fe 100644 (file)
  *
  */
 
+#include <linux/err.h>
 #include <linux/errno.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);
 
+void crypto_larval_error(const char *name, u32 type, u32 mask)
+{
+       struct crypto_alg *alg;
+
+       alg = crypto_alg_lookup(name, type, mask);
+
+       if (alg) {
+               if (crypto_is_larval(alg)) {
+                       struct crypto_larval *larval = (void *)alg;
+                       complete_all(&larval->completion);
+               }
+               crypto_mod_put(alg);
+       }
+}
+EXPORT_SYMBOL_GPL(crypto_larval_error);
+
 static inline int crypto_set_driver_name(struct crypto_alg *alg)
 {
        static const char suffix[] = "-generic";
@@ -43,9 +62,6 @@ static int crypto_check_alg(struct crypto_alg *alg)
        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;
 
@@ -55,25 +71,287 @@ static int crypto_check_alg(struct crypto_alg *alg)
        return crypto_set_driver_name(alg);
 }
 
-static int __crypto_register_alg(struct crypto_alg *alg)
+static void crypto_destroy_instance(struct crypto_alg *alg)
+{
+       struct crypto_instance *inst = (void *)alg;
+       struct crypto_template *tmpl = inst->tmpl;
+
+       tmpl->free(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;
+
+       if (list_empty(stack))
+               return NULL;
+
+       spawn = list_first_entry(stack, struct crypto_spawn, list);
+       n = list_entry(spawn->list.next, struct crypto_spawn, list);
+
+       if (spawn->alg && &n->list != stack && !n->alg)
+               n->alg = (n->list.next == stack) ? alg :
+                        &list_entry(n->list.next, struct crypto_spawn,
+                                    list)->inst->alg;
+
+       list_move(&spawn->list, secondary_spawns);
+
+       return &n->list == stack ? top : &n->inst->alg.cra_users;
+}
+
+static void crypto_remove_spawn(struct crypto_spawn *spawn,
+                               struct list_head *list)
+{
+       struct crypto_instance *inst = spawn->inst;
+       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_spawn(spawn, list);
+       }
+}
+EXPORT_SYMBOL_GPL(crypto_remove_spawns);
+
+static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
 {
        struct crypto_alg *q;
-       int ret = -EEXIST;
+       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;
+
+       atomic_set(&alg->cra_refcnt, 1);
        list_for_each_entry(q, &crypto_alg_list, cra_list) {
                if (q == alg)
-                       goto out;
+                       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);
-       atomic_set(&alg->cra_refcnt, 1);
-       ret = 0;
-out:   
-       return ret;
+       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;
+                       complete_all(&larval->completion);
+                       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_interruptible(&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;
 
        err = crypto_check_alg(alg);
@@ -81,22 +359,38 @@ int crypto_register_alg(struct crypto_alg *alg)
                return err;
 
        down_write(&crypto_alg_sem);
-       err = __crypto_register_alg(alg);
+       larval = __crypto_register_alg(alg);
        up_write(&crypto_alg_sem);
 
-       return err;
+       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 = -ENOENT;
-       
+       int ret;
+       LIST_HEAD(list);
+
        down_write(&crypto_alg_sem);
-       if (likely(!list_empty(&alg->cra_list))) {
-               list_del_init(&alg->cra_list);
-               ret = 0;
-       }
+       ret = crypto_remove_alg(alg, &list);
        up_write(&crypto_alg_sem);
 
        if (ret)
@@ -106,6 +400,7 @@ int crypto_unregister_alg(struct crypto_alg *alg)
        if (alg->cra_destroy)
                alg->cra_destroy(alg);
 
+       crypto_remove_final(&list);
        return 0;
 }
 EXPORT_SYMBOL_GPL(crypto_unregister_alg);
@@ -123,6 +418,7 @@ int crypto_register_template(struct crypto_template *tmpl)
        }
 
        list_add(&tmpl->list, &crypto_template_list);
+       crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
        err = 0;
 out:
        up_write(&crypto_alg_sem);
@@ -135,6 +431,7 @@ void crypto_unregister_template(struct crypto_template *tmpl)
        struct crypto_instance *inst;
        struct hlist_node *p, *n;
        struct hlist_head *list;
+       LIST_HEAD(users);
 
        down_write(&crypto_alg_sem);
 
@@ -143,16 +440,19 @@ void crypto_unregister_template(struct crypto_template *tmpl)
 
        list = &tmpl->instances;
        hlist_for_each_entry(inst, p, list, list) {
-               BUG_ON(list_empty(&inst->alg.cra_list));
-               list_del_init(&inst->alg.cra_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, p, n, list, list) {
                BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
                tmpl->free(inst);
        }
+       crypto_remove_final(&users);
 }
 EXPORT_SYMBOL_GPL(crypto_unregister_template);
 
@@ -184,21 +484,20 @@ EXPORT_SYMBOL_GPL(crypto_lookup_template);
 int crypto_register_instance(struct crypto_template *tmpl,
                             struct crypto_instance *inst)
 {
-       int err = -EINVAL;
-
-       if (inst->alg.cra_destroy)
-               goto err;
+       struct crypto_larval *larval;
+       int err;
 
        err = crypto_check_alg(&inst->alg);
        if (err)
                goto err;
 
        inst->alg.cra_module = tmpl->module;
+       inst->alg.cra_flags |= CRYPTO_ALG_INSTANCE;
 
        down_write(&crypto_alg_sem);
 
-       err = __crypto_register_alg(&inst->alg);
-       if (err)
+       larval = __crypto_register_alg(&inst->alg);
+       if (IS_ERR(larval))
                goto unlock;
 
        hlist_add_head(&inst->list, &tmpl->instances);
@@ -207,11 +506,436 @@ int crypto_register_instance(struct crypto_template *tmpl,
 unlock:
        up_write(&crypto_alg_sem);
 
+       err = PTR_ERR(larval);
+       if (IS_ERR(larval))
+               goto err;
+
+       crypto_wait_for_test(larval);
+       err = 0;
+
 err:
        return err;
 }
 EXPORT_SYMBOL_GPL(crypto_register_instance);
 
+int crypto_unregister_instance(struct crypto_alg *alg)
+{
+       int err;
+       struct crypto_instance *inst = (void *)alg;
+       struct crypto_template *tmpl = inst->tmpl;
+       LIST_HEAD(users);
+
+       if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
+               return -EINVAL;
+
+       BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
+
+       down_write(&crypto_alg_sem);
+
+       hlist_del_init(&inst->list);
+       err = crypto_remove_alg(alg, &users);
+
+       up_write(&crypto_alg_sem);
+
+       if (err)
+               return err;
+
+       tmpl->free(inst);
+       crypto_remove_final(&users);
+
+       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);
+
+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;
+       int err;
+
+       name = crypto_attr_alg_name(rta);
+       err = PTR_ERR(name);
+       if (IS_ERR(name))
+               return ERR_PTR(err);
+
+       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);
+
+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 = -ENAMETOOLONG;
+       if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
+                    alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
+               goto err_free_inst;
+
+       if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
+                    name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
+               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);
+
+void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset)
+{
+       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 (char *)list_entry(request, struct crypto_async_request, list) -
+              offset;
+}
+EXPORT_SYMBOL_GPL(__crypto_dequeue_request);
+
+struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
+{
+       return __crypto_dequeue_request(queue, 0);
+}
+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++;
+
+       crypto_xor_byte((u8 *)a, (u8 *)b, size);
+}
+EXPORT_SYMBOL_GPL(crypto_xor);
+
 static int __init crypto_algapi_init(void)
 {
        crypto_init_proc();