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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Cryptographic API for algorithms (i.e., low-level API).
- *
- * Copyright (c) 2006 Herbert Xu <[email protected]>
- */
- #include <crypto/algapi.h>
- #include <crypto/internal/simd.h>
- #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);
- #ifdef CONFIG_CRYPTO_MANAGER_EXTRA_TESTS
- DEFINE_PER_CPU(bool, crypto_simd_disabled_for_test);
- EXPORT_PER_CPU_SYMBOL_GPL(crypto_simd_disabled_for_test);
- #endif
- 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_name[0] || !alg->cra_driver_name[0])
- return -EINVAL;
- if (alg->cra_alignmask & (alg->cra_alignmask + 1))
- return -EINVAL;
- /* General maximums for all algs. */
- if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
- return -EINVAL;
- if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
- return -EINVAL;
- /* Lower maximums for specific alg types. */
- if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
- CRYPTO_ALG_TYPE_CIPHER) {
- if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
- return -EINVAL;
- if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
- return -EINVAL;
- }
- if (alg->cra_priority < 0)
- return -EINVAL;
- refcount_set(&alg->cra_refcnt, 1);
- return 0;
- }
- static void crypto_free_instance(struct crypto_instance *inst)
- {
- 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);
- }
- /*
- * This function adds a spawn to the list secondary_spawns which
- * will be used at the end of crypto_remove_spawns to unregister
- * instances, unless the spawn happens to be one that is depended
- * on by the new algorithm (nalg in crypto_remove_spawns).
- *
- * This function is also responsible for resurrecting any algorithms
- * in the dependency chain of nalg by unsetting n->dead.
- */
- 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_prev_entry(spawn, list);
- list_move(&spawn->list, secondary_spawns);
- if (list_is_last(&n->list, stack))
- return top;
- n = list_next_entry(n, list);
- if (!spawn->dead)
- n->dead = false;
- return &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 (!tmpl || !crypto_tmpl_get(tmpl))
- return;
- 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));
- }
- /*
- * Given an algorithm alg, remove all algorithms that depend on it
- * through spawns. If nalg is not null, then exempt any algorithms
- * that is depended on by nalg. This is useful when nalg itself
- * depends on alg.
- */
- 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);
- }
- /*
- * Perform a depth-first walk starting from alg through
- * the cra_users tree. The list stack records the path
- * from alg to the current spawn.
- */
- spawns = ⊤
- do {
- while (!list_empty(spawns)) {
- struct crypto_instance *inst;
- spawn = list_first_entry(spawns, struct crypto_spawn,
- list);
- inst = spawn->inst;
- list_move(&spawn->list, &stack);
- spawn->dead = !spawn->registered || &inst->alg != nalg;
- if (!spawn->registered)
- break;
- BUG_ON(&inst->alg == alg);
- if (&inst->alg == nalg)
- break;
- spawns = &inst->alg.cra_users;
- /*
- * Even if spawn->registered is true, the
- * instance itself may still be unregistered.
- * This is because it may have failed during
- * registration. Therefore we still need to
- * make the following test.
- *
- * 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)));
- /*
- * Remove all instances that are marked as dead. Also
- * complete the resurrection of the others by moving them
- * back to the cra_users list.
- */
- list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
- if (!spawn->dead)
- list_move(&spawn->list, &spawn->alg->cra_users);
- else if (spawn->registered)
- crypto_remove_instance(spawn->inst, list);
- }
- }
- EXPORT_SYMBOL_GPL(crypto_remove_spawns);
- static void crypto_alg_finish_registration(struct crypto_alg *alg,
- bool fulfill_requests,
- struct list_head *algs_to_put)
- {
- struct crypto_alg *q;
- 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 (fulfill_requests && crypto_mod_get(alg))
- larval->adult = alg;
- else
- larval->adult = ERR_PTR(-EAGAIN);
- 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, algs_to_put, alg);
- }
- crypto_notify(CRYPTO_MSG_ALG_LOADED, alg);
- }
- static struct crypto_larval *crypto_alloc_test_larval(struct crypto_alg *alg)
- {
- struct crypto_larval *larval;
- if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER) ||
- IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) ||
- (alg->cra_flags & CRYPTO_ALG_INTERNAL))
- return NULL; /* No self-test needed */
- larval = crypto_larval_alloc(alg->cra_name,
- alg->cra_flags | CRYPTO_ALG_TESTED, 0);
- if (IS_ERR(larval))
- return larval;
- larval->adult = crypto_mod_get(alg);
- if (!larval->adult) {
- kfree(larval);
- return ERR_PTR(-ENOENT);
- }
- refcount_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;
- return larval;
- }
- static struct crypto_larval *
- __crypto_register_alg(struct crypto_alg *alg, struct list_head *algs_to_put)
- {
- struct crypto_alg *q;
- struct crypto_larval *larval;
- int ret = -EAGAIN;
- if (crypto_is_dead(alg))
- goto err;
- INIT_LIST_HEAD(&alg->cra_users);
- 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_alloc_test_larval(alg);
- if (IS_ERR(larval))
- goto out;
- list_add(&alg->cra_list, &crypto_alg_list);
- crypto_stats_init(alg);
- if (larval) {
- /* No cheating! */
- alg->cra_flags &= ~CRYPTO_ALG_TESTED;
- list_add(&larval->alg.cra_list, &crypto_alg_list);
- } else {
- alg->cra_flags |= CRYPTO_ALG_TESTED;
- crypto_alg_finish_registration(alg, true, algs_to_put);
- }
- out:
- return 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);
- bool best;
- 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;
- }
- pr_err("alg: Unexpected test result for %s: %d\n", name, err);
- goto unlock;
- found:
- q->cra_flags |= CRYPTO_ALG_DEAD;
- alg = test->adult;
- if (list_empty(&alg->cra_list))
- goto complete;
- if (err == -ECANCELED)
- alg->cra_flags |= CRYPTO_ALG_FIPS_INTERNAL;
- else if (err)
- goto complete;
- else
- alg->cra_flags &= ~CRYPTO_ALG_FIPS_INTERNAL;
- alg->cra_flags |= CRYPTO_ALG_TESTED;
- /*
- * If a higher-priority implementation of the same algorithm is
- * currently being tested, then don't fulfill request larvals.
- */
- best = true;
- list_for_each_entry(q, &crypto_alg_list, cra_list) {
- if (crypto_is_moribund(q) || !crypto_is_larval(q))
- continue;
- if (strcmp(alg->cra_name, q->cra_name))
- continue;
- if (q->cra_priority > alg->cra_priority) {
- best = false;
- break;
- }
- }
- crypto_alg_finish_registration(alg, best, &list);
- 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);
- int crypto_register_alg(struct crypto_alg *alg)
- {
- struct crypto_larval *larval;
- LIST_HEAD(algs_to_put);
- bool test_started = false;
- 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, &algs_to_put);
- if (!IS_ERR_OR_NULL(larval)) {
- test_started = crypto_boot_test_finished();
- larval->test_started = test_started;
- }
- up_write(&crypto_alg_sem);
- if (IS_ERR(larval))
- return PTR_ERR(larval);
- if (test_started)
- crypto_wait_for_test(larval);
- crypto_remove_final(&algs_to_put);
- 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;
- list_del_init(&alg->cra_list);
- crypto_remove_spawns(alg, list, NULL);
- return 0;
- }
- void 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 (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
- return;
- if (WARN_ON(refcount_read(&alg->cra_refcnt) != 1))
- return;
- if (alg->cra_destroy)
- alg->cra_destroy(alg);
- crypto_remove_final(&list);
- }
- 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);
- void crypto_unregister_algs(struct crypto_alg *algs, int count)
- {
- int i;
- for (i = 0; i < count; i++)
- crypto_unregister_alg(&algs[i]);
- }
- 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);
- err = 0;
- out:
- up_write(&crypto_alg_sem);
- return err;
- }
- EXPORT_SYMBOL_GPL(crypto_register_template);
- int crypto_register_templates(struct crypto_template *tmpls, int count)
- {
- int i, err;
- for (i = 0; i < count; i++) {
- err = crypto_register_template(&tmpls[i]);
- if (err)
- goto out;
- }
- return 0;
- out:
- for (--i; i >= 0; --i)
- crypto_unregister_template(&tmpls[i]);
- return err;
- }
- EXPORT_SYMBOL_GPL(crypto_register_templates);
- 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);
- }
- up_write(&crypto_alg_sem);
- hlist_for_each_entry_safe(inst, n, list, list) {
- BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1);
- crypto_free_instance(inst);
- }
- crypto_remove_final(&users);
- }
- EXPORT_SYMBOL_GPL(crypto_unregister_template);
- void crypto_unregister_templates(struct crypto_template *tmpls, int count)
- {
- int i;
- for (i = count - 1; i >= 0; --i)
- crypto_unregister_template(&tmpls[i]);
- }
- EXPORT_SYMBOL_GPL(crypto_unregister_templates);
- 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;
- struct crypto_spawn *spawn;
- u32 fips_internal = 0;
- LIST_HEAD(algs_to_put);
- 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;
- down_write(&crypto_alg_sem);
- larval = ERR_PTR(-EAGAIN);
- for (spawn = inst->spawns; spawn;) {
- struct crypto_spawn *next;
- if (spawn->dead)
- goto unlock;
- next = spawn->next;
- spawn->inst = inst;
- spawn->registered = true;
- fips_internal |= spawn->alg->cra_flags;
- crypto_mod_put(spawn->alg);
- spawn = next;
- }
- inst->alg.cra_flags |= (fips_internal & CRYPTO_ALG_FIPS_INTERNAL);
- larval = __crypto_register_alg(&inst->alg, &algs_to_put);
- if (IS_ERR(larval))
- goto unlock;
- else if (larval)
- larval->test_started = true;
- hlist_add_head(&inst->list, &tmpl->instances);
- inst->tmpl = tmpl;
- unlock:
- up_write(&crypto_alg_sem);
- if (IS_ERR(larval))
- return PTR_ERR(larval);
- if (larval)
- crypto_wait_for_test(larval);
- crypto_remove_final(&algs_to_put);
- return 0;
- }
- EXPORT_SYMBOL_GPL(crypto_register_instance);
- void 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);
- }
- EXPORT_SYMBOL_GPL(crypto_unregister_instance);
- int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
- const char *name, u32 type, u32 mask)
- {
- struct crypto_alg *alg;
- int err = -EAGAIN;
- if (WARN_ON_ONCE(inst == NULL))
- return -EINVAL;
- /* Allow the result of crypto_attr_alg_name() to be passed directly */
- if (IS_ERR(name))
- return PTR_ERR(name);
- alg = crypto_find_alg(name, spawn->frontend,
- type | CRYPTO_ALG_FIPS_INTERNAL, mask);
- if (IS_ERR(alg))
- return PTR_ERR(alg);
- down_write(&crypto_alg_sem);
- if (!crypto_is_moribund(alg)) {
- list_add(&spawn->list, &alg->cra_users);
- spawn->alg = alg;
- spawn->mask = mask;
- spawn->next = inst->spawns;
- inst->spawns = spawn;
- inst->alg.cra_flags |=
- (alg->cra_flags & CRYPTO_ALG_INHERITED_FLAGS);
- err = 0;
- }
- up_write(&crypto_alg_sem);
- if (err)
- crypto_mod_put(alg);
- return err;
- }
- EXPORT_SYMBOL_GPL(crypto_grab_spawn);
- void crypto_drop_spawn(struct crypto_spawn *spawn)
- {
- if (!spawn->alg) /* not yet initialized? */
- return;
- down_write(&crypto_alg_sem);
- if (!spawn->dead)
- list_del(&spawn->list);
- up_write(&crypto_alg_sem);
- if (!spawn->registered)
- crypto_mod_put(spawn->alg);
- }
- EXPORT_SYMBOL_GPL(crypto_drop_spawn);
- static struct crypto_alg *crypto_spawn_alg(struct crypto_spawn *spawn)
- {
- struct crypto_alg *alg = ERR_PTR(-EAGAIN);
- struct crypto_alg *target;
- bool shoot = false;
- down_read(&crypto_alg_sem);
- if (!spawn->dead) {
- alg = spawn->alg;
- if (!crypto_mod_get(alg)) {
- target = crypto_alg_get(alg);
- shoot = true;
- alg = ERR_PTR(-EAGAIN);
- }
- }
- up_read(&crypto_alg_sem);
- if (shoot) {
- crypto_shoot_alg(target);
- crypto_alg_put(target);
- }
- 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);
- /**
- * crypto_check_attr_type() - check algorithm type and compute inherited mask
- * @tb: the template parameters
- * @type: the algorithm type the template would be instantiated as
- * @mask_ret: (output) the mask that should be passed to crypto_grab_*()
- * to restrict the flags of any inner algorithms
- *
- * Validate that the algorithm type the user requested is compatible with the
- * one the template would actually be instantiated as. E.g., if the user is
- * doing crypto_alloc_shash("cbc(aes)", ...), this would return an error because
- * the "cbc" template creates an "skcipher" algorithm, not an "shash" algorithm.
- *
- * Also compute the mask to use to restrict the flags of any inner algorithms.
- *
- * Return: 0 on success; -errno on failure
- */
- int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret)
- {
- 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;
- *mask_ret = crypto_algt_inherited_mask(algt);
- 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);
- 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_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)) {
- if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
- err = -ENOSPC;
- goto out;
- }
- err = -EBUSY;
- 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_enqueue_request_head(struct crypto_queue *queue,
- struct crypto_async_request *request)
- {
- if (unlikely(queue->qlen >= queue->max_qlen))
- queue->backlog = queue->backlog->prev;
- queue->qlen++;
- list_add(&request->list, &queue->list);
- }
- EXPORT_SYMBOL_GPL(crypto_enqueue_request_head);
- 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);
- 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) ||
- IS_ALIGNED((unsigned long)b, __alignof__(*b)))
- for (; size >= 4; size -= 4) {
- c = be32_to_cpu(*--b) + 1;
- *b = cpu_to_be32(c);
- if (likely(c))
- return;
- }
- crypto_inc_byte(a, size);
- }
- EXPORT_SYMBOL_GPL(crypto_inc);
- 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);
- #ifdef CONFIG_CRYPTO_STATS
- void crypto_stats_init(struct crypto_alg *alg)
- {
- memset(&alg->stats, 0, sizeof(alg->stats));
- }
- EXPORT_SYMBOL_GPL(crypto_stats_init);
- void crypto_stats_get(struct crypto_alg *alg)
- {
- crypto_alg_get(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_get);
- void crypto_stats_aead_encrypt(unsigned int cryptlen, struct crypto_alg *alg,
- int ret)
- {
- if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
- atomic64_inc(&alg->stats.aead.err_cnt);
- } else {
- atomic64_inc(&alg->stats.aead.encrypt_cnt);
- atomic64_add(cryptlen, &alg->stats.aead.encrypt_tlen);
- }
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_aead_encrypt);
- void crypto_stats_aead_decrypt(unsigned int cryptlen, struct crypto_alg *alg,
- int ret)
- {
- if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
- atomic64_inc(&alg->stats.aead.err_cnt);
- } else {
- atomic64_inc(&alg->stats.aead.decrypt_cnt);
- atomic64_add(cryptlen, &alg->stats.aead.decrypt_tlen);
- }
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_aead_decrypt);
- void crypto_stats_akcipher_encrypt(unsigned int src_len, int ret,
- struct crypto_alg *alg)
- {
- if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
- atomic64_inc(&alg->stats.akcipher.err_cnt);
- } else {
- atomic64_inc(&alg->stats.akcipher.encrypt_cnt);
- atomic64_add(src_len, &alg->stats.akcipher.encrypt_tlen);
- }
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_akcipher_encrypt);
- void crypto_stats_akcipher_decrypt(unsigned int src_len, int ret,
- struct crypto_alg *alg)
- {
- if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
- atomic64_inc(&alg->stats.akcipher.err_cnt);
- } else {
- atomic64_inc(&alg->stats.akcipher.decrypt_cnt);
- atomic64_add(src_len, &alg->stats.akcipher.decrypt_tlen);
- }
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_akcipher_decrypt);
- void crypto_stats_akcipher_sign(int ret, struct crypto_alg *alg)
- {
- if (ret && ret != -EINPROGRESS && ret != -EBUSY)
- atomic64_inc(&alg->stats.akcipher.err_cnt);
- else
- atomic64_inc(&alg->stats.akcipher.sign_cnt);
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_akcipher_sign);
- void crypto_stats_akcipher_verify(int ret, struct crypto_alg *alg)
- {
- if (ret && ret != -EINPROGRESS && ret != -EBUSY)
- atomic64_inc(&alg->stats.akcipher.err_cnt);
- else
- atomic64_inc(&alg->stats.akcipher.verify_cnt);
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_akcipher_verify);
- void crypto_stats_compress(unsigned int slen, int ret, struct crypto_alg *alg)
- {
- if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
- atomic64_inc(&alg->stats.compress.err_cnt);
- } else {
- atomic64_inc(&alg->stats.compress.compress_cnt);
- atomic64_add(slen, &alg->stats.compress.compress_tlen);
- }
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_compress);
- void crypto_stats_decompress(unsigned int slen, int ret, struct crypto_alg *alg)
- {
- if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
- atomic64_inc(&alg->stats.compress.err_cnt);
- } else {
- atomic64_inc(&alg->stats.compress.decompress_cnt);
- atomic64_add(slen, &alg->stats.compress.decompress_tlen);
- }
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_decompress);
- void crypto_stats_ahash_update(unsigned int nbytes, int ret,
- struct crypto_alg *alg)
- {
- if (ret && ret != -EINPROGRESS && ret != -EBUSY)
- atomic64_inc(&alg->stats.hash.err_cnt);
- else
- atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_ahash_update);
- void crypto_stats_ahash_final(unsigned int nbytes, int ret,
- struct crypto_alg *alg)
- {
- if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
- atomic64_inc(&alg->stats.hash.err_cnt);
- } else {
- atomic64_inc(&alg->stats.hash.hash_cnt);
- atomic64_add(nbytes, &alg->stats.hash.hash_tlen);
- }
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_ahash_final);
- void crypto_stats_kpp_set_secret(struct crypto_alg *alg, int ret)
- {
- if (ret)
- atomic64_inc(&alg->stats.kpp.err_cnt);
- else
- atomic64_inc(&alg->stats.kpp.setsecret_cnt);
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_kpp_set_secret);
- void crypto_stats_kpp_generate_public_key(struct crypto_alg *alg, int ret)
- {
- if (ret)
- atomic64_inc(&alg->stats.kpp.err_cnt);
- else
- atomic64_inc(&alg->stats.kpp.generate_public_key_cnt);
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_kpp_generate_public_key);
- void crypto_stats_kpp_compute_shared_secret(struct crypto_alg *alg, int ret)
- {
- if (ret)
- atomic64_inc(&alg->stats.kpp.err_cnt);
- else
- atomic64_inc(&alg->stats.kpp.compute_shared_secret_cnt);
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_kpp_compute_shared_secret);
- void crypto_stats_rng_seed(struct crypto_alg *alg, int ret)
- {
- if (ret && ret != -EINPROGRESS && ret != -EBUSY)
- atomic64_inc(&alg->stats.rng.err_cnt);
- else
- atomic64_inc(&alg->stats.rng.seed_cnt);
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_rng_seed);
- void crypto_stats_rng_generate(struct crypto_alg *alg, unsigned int dlen,
- int ret)
- {
- if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
- atomic64_inc(&alg->stats.rng.err_cnt);
- } else {
- atomic64_inc(&alg->stats.rng.generate_cnt);
- atomic64_add(dlen, &alg->stats.rng.generate_tlen);
- }
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_rng_generate);
- void crypto_stats_skcipher_encrypt(unsigned int cryptlen, int ret,
- struct crypto_alg *alg)
- {
- if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
- atomic64_inc(&alg->stats.cipher.err_cnt);
- } else {
- atomic64_inc(&alg->stats.cipher.encrypt_cnt);
- atomic64_add(cryptlen, &alg->stats.cipher.encrypt_tlen);
- }
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_skcipher_encrypt);
- void crypto_stats_skcipher_decrypt(unsigned int cryptlen, int ret,
- struct crypto_alg *alg)
- {
- if (ret && ret != -EINPROGRESS && ret != -EBUSY) {
- atomic64_inc(&alg->stats.cipher.err_cnt);
- } else {
- atomic64_inc(&alg->stats.cipher.decrypt_cnt);
- atomic64_add(cryptlen, &alg->stats.cipher.decrypt_tlen);
- }
- crypto_alg_put(alg);
- }
- EXPORT_SYMBOL_GPL(crypto_stats_skcipher_decrypt);
- #endif
- static void __init crypto_start_tests(void)
- {
- if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS))
- return;
- for (;;) {
- struct crypto_larval *larval = NULL;
- struct crypto_alg *q;
- down_write(&crypto_alg_sem);
- list_for_each_entry(q, &crypto_alg_list, cra_list) {
- struct crypto_larval *l;
- if (!crypto_is_larval(q))
- continue;
- l = (void *)q;
- if (!crypto_is_test_larval(l))
- continue;
- if (l->test_started)
- continue;
- l->test_started = true;
- larval = l;
- break;
- }
- up_write(&crypto_alg_sem);
- if (!larval)
- break;
- crypto_wait_for_test(larval);
- }
- set_crypto_boot_test_finished();
- }
- static int __init crypto_algapi_init(void)
- {
- crypto_init_proc();
- crypto_start_tests();
- return 0;
- }
- static void __exit crypto_algapi_exit(void)
- {
- crypto_exit_proc();
- }
- /*
- * We run this at late_initcall so that all the built-in algorithms
- * have had a chance to register themselves first.
- */
- late_initcall(crypto_algapi_init);
- module_exit(crypto_algapi_exit);
- MODULE_LICENSE("GPL");
- MODULE_DESCRIPTION("Cryptographic algorithms API");
- MODULE_SOFTDEP("pre: cryptomgr");
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