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1c8fca1d92
The template lookup interface does not provide a way to use format strings, so make sure that the interface cannot be abused accidentally. Signed-off-by: Kees Cook <keescook@chromium.org> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: "David S. Miller" <davem@davemloft.net> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
972 lines
20 KiB
C
972 lines
20 KiB
C
/*
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* Cryptographic API for algorithms (i.e., low-level API).
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*
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/rtnetlink.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include "internal.h"
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static LIST_HEAD(crypto_template_list);
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static inline int crypto_set_driver_name(struct crypto_alg *alg)
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{
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static const char suffix[] = "-generic";
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char *driver_name = alg->cra_driver_name;
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int len;
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if (*driver_name)
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return 0;
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len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
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if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
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return -ENAMETOOLONG;
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memcpy(driver_name + len, suffix, sizeof(suffix));
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return 0;
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}
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static int crypto_check_alg(struct crypto_alg *alg)
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{
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if (alg->cra_alignmask & (alg->cra_alignmask + 1))
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return -EINVAL;
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if (alg->cra_blocksize > PAGE_SIZE / 8)
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return -EINVAL;
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if (alg->cra_priority < 0)
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return -EINVAL;
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return crypto_set_driver_name(alg);
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}
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static void crypto_destroy_instance(struct crypto_alg *alg)
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{
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struct crypto_instance *inst = (void *)alg;
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struct crypto_template *tmpl = inst->tmpl;
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tmpl->free(inst);
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crypto_tmpl_put(tmpl);
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}
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static struct list_head *crypto_more_spawns(struct crypto_alg *alg,
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struct list_head *stack,
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struct list_head *top,
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struct list_head *secondary_spawns)
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{
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struct crypto_spawn *spawn, *n;
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if (list_empty(stack))
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return NULL;
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spawn = list_first_entry(stack, struct crypto_spawn, list);
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n = list_entry(spawn->list.next, struct crypto_spawn, list);
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if (spawn->alg && &n->list != stack && !n->alg)
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n->alg = (n->list.next == stack) ? alg :
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&list_entry(n->list.next, struct crypto_spawn,
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list)->inst->alg;
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list_move(&spawn->list, secondary_spawns);
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return &n->list == stack ? top : &n->inst->alg.cra_users;
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}
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static void crypto_remove_spawn(struct crypto_spawn *spawn,
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struct list_head *list)
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{
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struct crypto_instance *inst = spawn->inst;
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struct crypto_template *tmpl = inst->tmpl;
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if (crypto_is_dead(&inst->alg))
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return;
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inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
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if (hlist_unhashed(&inst->list))
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return;
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if (!tmpl || !crypto_tmpl_get(tmpl))
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return;
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crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
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list_move(&inst->alg.cra_list, list);
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hlist_del(&inst->list);
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inst->alg.cra_destroy = crypto_destroy_instance;
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BUG_ON(!list_empty(&inst->alg.cra_users));
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}
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void crypto_remove_spawns(struct crypto_alg *alg, struct list_head *list,
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struct crypto_alg *nalg)
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{
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u32 new_type = (nalg ?: alg)->cra_flags;
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struct crypto_spawn *spawn, *n;
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LIST_HEAD(secondary_spawns);
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struct list_head *spawns;
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LIST_HEAD(stack);
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LIST_HEAD(top);
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spawns = &alg->cra_users;
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list_for_each_entry_safe(spawn, n, spawns, list) {
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if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
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continue;
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list_move(&spawn->list, &top);
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}
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spawns = ⊤
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do {
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while (!list_empty(spawns)) {
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struct crypto_instance *inst;
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spawn = list_first_entry(spawns, struct crypto_spawn,
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list);
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inst = spawn->inst;
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BUG_ON(&inst->alg == alg);
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list_move(&spawn->list, &stack);
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if (&inst->alg == nalg)
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break;
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spawn->alg = NULL;
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spawns = &inst->alg.cra_users;
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}
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} while ((spawns = crypto_more_spawns(alg, &stack, &top,
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&secondary_spawns)));
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list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
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if (spawn->alg)
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list_move(&spawn->list, &spawn->alg->cra_users);
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else
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crypto_remove_spawn(spawn, list);
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}
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}
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EXPORT_SYMBOL_GPL(crypto_remove_spawns);
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static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
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{
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struct crypto_alg *q;
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struct crypto_larval *larval;
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int ret = -EAGAIN;
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if (crypto_is_dead(alg))
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goto err;
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INIT_LIST_HEAD(&alg->cra_users);
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/* No cheating! */
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alg->cra_flags &= ~CRYPTO_ALG_TESTED;
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ret = -EEXIST;
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atomic_set(&alg->cra_refcnt, 1);
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list_for_each_entry(q, &crypto_alg_list, cra_list) {
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if (q == alg)
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goto err;
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if (crypto_is_moribund(q))
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continue;
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if (crypto_is_larval(q)) {
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if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
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goto err;
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continue;
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}
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if (!strcmp(q->cra_driver_name, alg->cra_name) ||
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!strcmp(q->cra_name, alg->cra_driver_name))
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goto err;
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}
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larval = crypto_larval_alloc(alg->cra_name,
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alg->cra_flags | CRYPTO_ALG_TESTED, 0);
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if (IS_ERR(larval))
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goto out;
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ret = -ENOENT;
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larval->adult = crypto_mod_get(alg);
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if (!larval->adult)
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goto free_larval;
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atomic_set(&larval->alg.cra_refcnt, 1);
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memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
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CRYPTO_MAX_ALG_NAME);
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larval->alg.cra_priority = alg->cra_priority;
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list_add(&alg->cra_list, &crypto_alg_list);
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list_add(&larval->alg.cra_list, &crypto_alg_list);
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out:
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return larval;
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free_larval:
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kfree(larval);
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err:
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larval = ERR_PTR(ret);
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goto out;
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}
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void crypto_alg_tested(const char *name, int err)
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{
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struct crypto_larval *test;
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struct crypto_alg *alg;
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struct crypto_alg *q;
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LIST_HEAD(list);
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down_write(&crypto_alg_sem);
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list_for_each_entry(q, &crypto_alg_list, cra_list) {
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if (crypto_is_moribund(q) || !crypto_is_larval(q))
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continue;
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test = (struct crypto_larval *)q;
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if (!strcmp(q->cra_driver_name, name))
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goto found;
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}
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printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
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goto unlock;
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found:
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q->cra_flags |= CRYPTO_ALG_DEAD;
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alg = test->adult;
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if (err || list_empty(&alg->cra_list))
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goto complete;
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alg->cra_flags |= CRYPTO_ALG_TESTED;
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list_for_each_entry(q, &crypto_alg_list, cra_list) {
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if (q == alg)
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continue;
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if (crypto_is_moribund(q))
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continue;
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if (crypto_is_larval(q)) {
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struct crypto_larval *larval = (void *)q;
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/*
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* Check to see if either our generic name or
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* specific name can satisfy the name requested
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* by the larval entry q.
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*/
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if (strcmp(alg->cra_name, q->cra_name) &&
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strcmp(alg->cra_driver_name, q->cra_name))
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continue;
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if (larval->adult)
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continue;
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if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
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continue;
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if (!crypto_mod_get(alg))
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continue;
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larval->adult = alg;
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continue;
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}
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if (strcmp(alg->cra_name, q->cra_name))
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continue;
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if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
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q->cra_priority > alg->cra_priority)
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continue;
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crypto_remove_spawns(q, &list, alg);
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}
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complete:
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complete_all(&test->completion);
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unlock:
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up_write(&crypto_alg_sem);
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crypto_remove_final(&list);
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}
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EXPORT_SYMBOL_GPL(crypto_alg_tested);
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void crypto_remove_final(struct list_head *list)
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{
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struct crypto_alg *alg;
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struct crypto_alg *n;
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list_for_each_entry_safe(alg, n, list, cra_list) {
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list_del_init(&alg->cra_list);
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crypto_alg_put(alg);
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}
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}
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EXPORT_SYMBOL_GPL(crypto_remove_final);
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static void crypto_wait_for_test(struct crypto_larval *larval)
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{
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int err;
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err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
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if (err != NOTIFY_STOP) {
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if (WARN_ON(err != NOTIFY_DONE))
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goto out;
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crypto_alg_tested(larval->alg.cra_driver_name, 0);
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}
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err = wait_for_completion_interruptible(&larval->completion);
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WARN_ON(err);
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out:
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crypto_larval_kill(&larval->alg);
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}
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int crypto_register_alg(struct crypto_alg *alg)
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{
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struct crypto_larval *larval;
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int err;
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err = crypto_check_alg(alg);
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if (err)
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return err;
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down_write(&crypto_alg_sem);
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larval = __crypto_register_alg(alg);
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up_write(&crypto_alg_sem);
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if (IS_ERR(larval))
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return PTR_ERR(larval);
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crypto_wait_for_test(larval);
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_register_alg);
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static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
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{
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if (unlikely(list_empty(&alg->cra_list)))
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return -ENOENT;
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alg->cra_flags |= CRYPTO_ALG_DEAD;
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crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
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list_del_init(&alg->cra_list);
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crypto_remove_spawns(alg, list, NULL);
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return 0;
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}
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int crypto_unregister_alg(struct crypto_alg *alg)
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{
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int ret;
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LIST_HEAD(list);
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down_write(&crypto_alg_sem);
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ret = crypto_remove_alg(alg, &list);
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up_write(&crypto_alg_sem);
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if (ret)
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return ret;
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BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
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if (alg->cra_destroy)
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alg->cra_destroy(alg);
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crypto_remove_final(&list);
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_unregister_alg);
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int crypto_register_algs(struct crypto_alg *algs, int count)
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{
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int i, ret;
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for (i = 0; i < count; i++) {
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ret = crypto_register_alg(&algs[i]);
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if (ret)
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goto err;
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}
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return 0;
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err:
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for (--i; i >= 0; --i)
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crypto_unregister_alg(&algs[i]);
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return ret;
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}
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EXPORT_SYMBOL_GPL(crypto_register_algs);
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int crypto_unregister_algs(struct crypto_alg *algs, int count)
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{
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int i, ret;
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for (i = 0; i < count; i++) {
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ret = crypto_unregister_alg(&algs[i]);
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if (ret)
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pr_err("Failed to unregister %s %s: %d\n",
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algs[i].cra_driver_name, algs[i].cra_name, ret);
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_unregister_algs);
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int crypto_register_template(struct crypto_template *tmpl)
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{
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struct crypto_template *q;
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int err = -EEXIST;
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down_write(&crypto_alg_sem);
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list_for_each_entry(q, &crypto_template_list, list) {
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if (q == tmpl)
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goto out;
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}
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list_add(&tmpl->list, &crypto_template_list);
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crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
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err = 0;
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out:
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up_write(&crypto_alg_sem);
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return err;
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}
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EXPORT_SYMBOL_GPL(crypto_register_template);
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void crypto_unregister_template(struct crypto_template *tmpl)
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{
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struct crypto_instance *inst;
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struct hlist_node *n;
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struct hlist_head *list;
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LIST_HEAD(users);
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down_write(&crypto_alg_sem);
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BUG_ON(list_empty(&tmpl->list));
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list_del_init(&tmpl->list);
|
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list = &tmpl->instances;
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hlist_for_each_entry(inst, list, list) {
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int err = crypto_remove_alg(&inst->alg, &users);
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BUG_ON(err);
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}
|
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crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
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|
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up_write(&crypto_alg_sem);
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|
|
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hlist_for_each_entry_safe(inst, n, list, list) {
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BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
|
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tmpl->free(inst);
|
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}
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crypto_remove_final(&users);
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}
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EXPORT_SYMBOL_GPL(crypto_unregister_template);
|
|
|
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static struct crypto_template *__crypto_lookup_template(const char *name)
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{
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struct crypto_template *q, *tmpl = NULL;
|
|
|
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down_read(&crypto_alg_sem);
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list_for_each_entry(q, &crypto_template_list, list) {
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if (strcmp(q->name, name))
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continue;
|
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if (unlikely(!crypto_tmpl_get(q)))
|
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continue;
|
|
|
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tmpl = q;
|
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break;
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}
|
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up_read(&crypto_alg_sem);
|
|
|
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return tmpl;
|
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}
|
|
|
|
struct crypto_template *crypto_lookup_template(const char *name)
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{
|
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return try_then_request_module(__crypto_lookup_template(name), "%s",
|
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name);
|
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}
|
|
EXPORT_SYMBOL_GPL(crypto_lookup_template);
|
|
|
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int crypto_register_instance(struct crypto_template *tmpl,
|
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struct crypto_instance *inst)
|
|
{
|
|
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);
|
|
|
|
larval = __crypto_register_alg(&inst->alg);
|
|
if (IS_ERR(larval))
|
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goto unlock;
|
|
|
|
hlist_add_head(&inst->list, &tmpl->instances);
|
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inst->tmpl = tmpl;
|
|
|
|
unlock:
|
|
up_write(&crypto_alg_sem);
|
|
|
|
err = PTR_ERR(larval);
|
|
if (IS_ERR(larval))
|
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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;
|
|
|
|
name = crypto_attr_alg_name(rta);
|
|
if (IS_ERR(name))
|
|
return ERR_CAST(name);
|
|
|
|
return crypto_find_alg(name, frontend, type, mask);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_attr_alg2);
|
|
|
|
int crypto_attr_u32(struct rtattr *rta, u32 *num)
|
|
{
|
|
struct crypto_attr_u32 *nu32;
|
|
|
|
if (!rta)
|
|
return -ENOENT;
|
|
if (RTA_PAYLOAD(rta) < sizeof(*nu32))
|
|
return -EINVAL;
|
|
if (rta->rta_type != CRYPTOA_U32)
|
|
return -EINVAL;
|
|
|
|
nu32 = RTA_DATA(rta);
|
|
*num = nu32->num;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_attr_u32);
|
|
|
|
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();
|
|
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");
|