diff options
Diffstat (limited to 'crypto/algapi.c')
| -rw-r--r-- | crypto/algapi.c | 1119 |
1 files changed, 1119 insertions, 0 deletions
diff --git a/crypto/algapi.c b/crypto/algapi.c new file mode 100644 index 000000000..85bc279b4 --- /dev/null +++ b/crypto/algapi.c @@ -0,0 +1,1119 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Cryptographic API for algorithms (i.e., low-level API). + * + * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> + */ + +#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 <linux/workqueue.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_workfn(struct work_struct *w) +{ + struct crypto_instance *inst = container_of(w, struct crypto_instance, + free_work); + struct crypto_template *tmpl = inst->tmpl; + + crypto_free_instance(inst); + crypto_tmpl_put(tmpl); +} + +static void crypto_destroy_instance(struct crypto_alg *alg) +{ + struct crypto_instance *inst = container_of(alg, + struct crypto_instance, + alg); + + INIT_WORK(&inst->free_work, crypto_destroy_instance_workfn); + schedule_work(&inst->free_work); +} + +/* + * 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_driver_name, alg->cra_driver_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); + + 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); + +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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