--- /dev/null
+/*
+ * 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/init.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/rtnetlink.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;
+
+ down_read(&crypto_alg_sem);
+ alg = __crypto_alg_lookup(name, type, mask);
+ up_read(&crypto_alg_sem);
+
+ if (alg) {
+ if (crypto_is_larval(alg)) {
+ struct crypto_larval *larval = (void *)alg;
+ complete(&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";
+ 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 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;
+
+ if (alg->cra_priority < 0)
+ return -EINVAL;
+
+ return crypto_set_driver_name(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 void crypto_remove_spawns(struct list_head *spawns,
+ struct list_head *list)
+{
+ struct crypto_spawn *spawn, *n;
+
+ list_for_each_entry_safe(spawn, n, spawns, list) {
+ struct crypto_instance *inst = spawn->inst;
+ struct crypto_template *tmpl = inst->tmpl;
+
+ list_del_init(&spawn->list);
+ spawn->alg = NULL;
+
+ if (crypto_is_dead(&inst->alg))
+ continue;
+
+ inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
+ if (!tmpl || !crypto_tmpl_get(tmpl))
+ continue;
+
+ 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;
+
+ if (!list_empty(&inst->alg.cra_users)) {
+ if (&n->list == spawns)
+ n = list_entry(inst->alg.cra_users.next,
+ typeof(*n), list);
+ __list_splice(&inst->alg.cra_users, spawns->prev);
+ }
+ }
+}
+
+static int __crypto_register_alg(struct crypto_alg *alg,
+ struct list_head *list)
+{
+ struct crypto_alg *q;
+ int ret = -EAGAIN;
+
+ if (crypto_is_dead(alg))
+ goto out;
+
+ INIT_LIST_HEAD(&alg->cra_users);
+
+ ret = -EEXIST;
+
+ atomic_set(&alg->cra_refcnt, 1);
+ list_for_each_entry(q, &crypto_alg_list, cra_list) {
+ if (q == alg)
+ goto out;
+
+ if (crypto_is_moribund(q))
+ continue;
+
+ if (crypto_is_larval(q)) {
+ struct crypto_larval *larval = (void *)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(&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->cra_users, list);
+ }
+
+ list_add(&alg->cra_list, &crypto_alg_list);
+
+ crypto_notify(CRYPTO_MSG_ALG_REGISTER, alg);
+ ret = 0;
+
+out:
+ return ret;
+}
+
+static 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);
+ }
+}
+
+int crypto_register_alg(struct crypto_alg *alg)
+{
+ LIST_HEAD(list);
+ int err;
+
+ err = crypto_check_alg(alg);
+ if (err)
+ return err;
+
+ down_write(&crypto_alg_sem);
+ err = __crypto_register_alg(alg, &list);
+ up_write(&crypto_alg_sem);
+
+ crypto_remove_final(&list);
+ return err;
+}
+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->cra_users, list);
+
+ 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_template(struct crypto_template *tmpl)
+{
+ struct crypto_template *q;
+ int err = -EEXIST;
+
+ down_write(&crypto_alg_sem);
+
+ 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 *p, *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, p, 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, 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);
+
+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), name);
+}
+EXPORT_SYMBOL_GPL(crypto_lookup_template);
+
+int crypto_register_instance(struct crypto_template *tmpl,
+ struct crypto_instance *inst)
+{
+ LIST_HEAD(list);
+ int err = -EINVAL;
+
+ if (inst->alg.cra_destroy)
+ goto err;
+
+ err = crypto_check_alg(&inst->alg);
+ if (err)
+ goto err;
+
+ inst->alg.cra_module = tmpl->module;
+
+ down_write(&crypto_alg_sem);
+
+ err = __crypto_register_alg(&inst->alg, &list);
+ if (err)
+ goto unlock;
+
+ hlist_add_head(&inst->list, &tmpl->instances);
+ inst->tmpl = tmpl;
+
+unlock:
+ up_write(&crypto_alg_sem);
+
+ crypto_remove_final(&list);
+
+err:
+ return err;
+}
+EXPORT_SYMBOL_GPL(crypto_register_instance);
+
+int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
+ struct crypto_instance *inst)
+{
+ int err = -EAGAIN;
+
+ spawn->inst = inst;
+
+ 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);
+
+void crypto_drop_spawn(struct crypto_spawn *spawn)
+{
+ down_write(&crypto_alg_sem);
+ list_del(&spawn->list);
+ up_write(&crypto_alg_sem);
+}
+EXPORT_SYMBOL_GPL(crypto_drop_spawn);
+
+struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn)
+{
+ struct crypto_alg *alg;
+ struct crypto_alg *alg2;
+ struct crypto_tfm *tfm;
+
+ 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);
+ }
+
+ tfm = __crypto_alloc_tfm(alg, 0);
+ if (IS_ERR(tfm))
+ crypto_mod_put(alg);
+
+ return tfm;
+}
+EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
+
+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_alg *crypto_get_attr_alg(void *param, unsigned int len,
+ u32 type, u32 mask)
+{
+ struct rtattr *rta = param;
+ struct crypto_attr_alg *alga;
+
+ if (!RTA_OK(rta, len))
+ return ERR_PTR(-EBADR);
+ if (rta->rta_type != CRYPTOA_ALG || RTA_PAYLOAD(rta) < sizeof(*alga))
+ return ERR_PTR(-EINVAL);
+
+ alga = RTA_DATA(rta);
+ alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
+
+ return crypto_alg_mod_lookup(alga->name, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_get_attr_alg);
+
+struct crypto_instance *crypto_alloc_instance(const char *name,
+ struct crypto_alg *alg)
+{
+ struct crypto_instance *inst;
+ struct crypto_spawn *spawn;
+ int err;
+
+ inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
+ if (!inst)
+ return ERR_PTR(-ENOMEM);
+
+ 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;
+
+ spawn = crypto_instance_ctx(inst);
+ err = crypto_init_spawn(spawn, alg, inst);
+
+ if (err)
+ goto err_free_inst;
+
+ return inst;
+
+err_free_inst:
+ kfree(inst);
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL_GPL(crypto_alloc_instance);
+
+static int __init crypto_algapi_init(void)
+{
+ crypto_init_proc();
+ return 0;
+}
+
+static void __exit crypto_algapi_exit(void)
+{
+ crypto_exit_proc();
+}
+
+module_init(crypto_algapi_init);
+module_exit(crypto_algapi_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cryptographic algorithms API");
git://git.onelab.eu / linux-2.6.git / blobdiff