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7bcb2c99f8
The flag CRYPTO_ALG_ASYNC is "inherited" in the sense that when a template is instantiated, the template will have CRYPTO_ALG_ASYNC set if any of the algorithms it uses has CRYPTO_ALG_ASYNC set. We'd like to add a second flag (CRYPTO_ALG_ALLOCATES_MEMORY) that gets "inherited" in the same way. This is difficult because the handling of CRYPTO_ALG_ASYNC is hardcoded everywhere. Address this by: - Add CRYPTO_ALG_INHERITED_FLAGS, which contains the set of flags that have these inheritance semantics. - Add crypto_algt_inherited_mask(), for use by template ->create() methods. It returns any of these flags that the user asked to be unset and thus must be passed in the 'mask' to crypto_grab_*(). - Also modify crypto_check_attr_type() to handle computing the 'mask' so that most templates can just use this. - Make crypto_grab_*() propagate these flags to the template instance being created so that templates don't have to do this themselves. Make crypto/simd.c propagate these flags too, since it "wraps" another algorithm, similar to a template. Based on a patch by Mikulas Patocka <mpatocka@redhat.com> (https://lore.kernel.org/r/alpine.LRH.2.02.2006301414580.30526@file01.intranet.prod.int.rdu2.redhat.com). Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
1298 lines
30 KiB
C
1298 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#include <crypto/algapi.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/fips.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 void crypto_check_module_sig(struct module *mod)
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{
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if (fips_enabled && mod && !module_sig_ok(mod))
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panic("Module %s signature verification failed in FIPS mode\n",
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module_name(mod));
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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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crypto_check_module_sig(alg->cra_module);
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if (!alg->cra_name[0] || !alg->cra_driver_name[0])
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return -EINVAL;
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if (alg->cra_alignmask & (alg->cra_alignmask + 1))
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return -EINVAL;
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/* General maximums for all algs. */
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if (alg->cra_alignmask > MAX_ALGAPI_ALIGNMASK)
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return -EINVAL;
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if (alg->cra_blocksize > MAX_ALGAPI_BLOCKSIZE)
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return -EINVAL;
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/* Lower maximums for specific alg types. */
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if (!alg->cra_type && (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
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CRYPTO_ALG_TYPE_CIPHER) {
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if (alg->cra_alignmask > MAX_CIPHER_ALIGNMASK)
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return -EINVAL;
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if (alg->cra_blocksize > MAX_CIPHER_BLOCKSIZE)
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return -EINVAL;
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}
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if (alg->cra_priority < 0)
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return -EINVAL;
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refcount_set(&alg->cra_refcnt, 1);
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return 0;
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}
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static void crypto_free_instance(struct crypto_instance *inst)
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{
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inst->alg.cra_type->free(inst);
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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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crypto_free_instance(inst);
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crypto_tmpl_put(tmpl);
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}
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/*
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* This function adds a spawn to the list secondary_spawns which
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* will be used at the end of crypto_remove_spawns to unregister
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* instances, unless the spawn happens to be one that is depended
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* on by the new algorithm (nalg in crypto_remove_spawns).
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*
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* This function is also responsible for resurrecting any algorithms
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* in the dependency chain of nalg by unsetting n->dead.
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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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spawn = list_first_entry_or_null(stack, struct crypto_spawn, list);
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if (!spawn)
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return NULL;
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n = list_prev_entry(spawn, list);
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list_move(&spawn->list, secondary_spawns);
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if (list_is_last(&n->list, stack))
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return top;
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n = list_next_entry(n, list);
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if (!spawn->dead)
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n->dead = false;
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return &n->inst->alg.cra_users;
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}
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static void crypto_remove_instance(struct crypto_instance *inst,
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struct list_head *list)
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{
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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 (!tmpl || !crypto_tmpl_get(tmpl))
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return;
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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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/*
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* Given an algorithm alg, remove all algorithms that depend on it
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* through spawns. If nalg is not null, then exempt any algorithms
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* that is depended on by nalg. This is useful when nalg itself
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* depends on alg.
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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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/*
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* Perform a depth-first walk starting from alg through
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* the cra_users tree. The list stack records the path
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* from alg to the current spawn.
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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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list_move(&spawn->list, &stack);
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spawn->dead = !spawn->registered || &inst->alg != nalg;
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if (!spawn->registered)
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break;
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BUG_ON(&inst->alg == alg);
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if (&inst->alg == nalg)
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break;
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spawns = &inst->alg.cra_users;
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/*
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* Even if spawn->registered is true, the
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* instance itself may still be unregistered.
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* This is because it may have failed during
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* registration. Therefore we still need to
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* make the following test.
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*
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* We may encounter an unregistered instance here, since
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* an instance's spawns are set up prior to the instance
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* being registered. An unregistered instance will have
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* NULL ->cra_users.next, since ->cra_users isn't
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* properly initialized until registration. But an
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* unregistered instance cannot have any users, so treat
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* it the same as ->cra_users being empty.
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*/
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if (spawns->next == NULL)
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break;
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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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/*
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* Remove all instances that are marked as dead. Also
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* complete the resurrection of the others by moving them
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* back to the cra_users list.
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*/
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list_for_each_entry_safe(spawn, n, &secondary_spawns, list) {
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if (!spawn->dead)
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list_move(&spawn->list, &spawn->alg->cra_users);
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else if (spawn->registered)
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crypto_remove_instance(spawn->inst, 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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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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refcount_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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crypto_stats_init(alg);
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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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bool best;
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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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pr_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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/* Only satisfy larval waiters if we are the best. */
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best = true;
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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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if (strcmp(alg->cra_name, q->cra_name))
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continue;
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if (q->cra_priority > alg->cra_priority) {
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best = false;
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break;
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}
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}
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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 (best && crypto_mod_get(alg))
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larval->adult = alg;
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else
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larval->adult = ERR_PTR(-EAGAIN);
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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_killable(&larval->completion);
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WARN_ON(err);
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if (!err)
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crypto_notify(CRYPTO_MSG_ALG_LOADED, larval);
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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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alg->cra_flags &= ~CRYPTO_ALG_DEAD;
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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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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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void 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 (WARN(ret, "Algorithm %s is not registered", alg->cra_driver_name))
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return;
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BUG_ON(refcount_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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}
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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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void crypto_unregister_algs(struct crypto_alg *algs, int count)
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{
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int i;
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for (i = 0; i < count; i++)
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crypto_unregister_alg(&algs[i]);
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}
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EXPORT_SYMBOL_GPL(crypto_unregister_algs);
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|
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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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|
|
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down_write(&crypto_alg_sem);
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crypto_check_module_sig(tmpl->module);
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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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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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int crypto_register_templates(struct crypto_template *tmpls, int count)
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|
{
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int i, err;
|
|
|
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for (i = 0; i < count; i++) {
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err = crypto_register_template(&tmpls[i]);
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if (err)
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goto out;
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}
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return 0;
|
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|
|
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;
|
|
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;
|
|
|
|
crypto_mod_put(spawn->alg);
|
|
|
|
spawn = next;
|
|
}
|
|
|
|
larval = __crypto_register_alg(&inst->alg);
|
|
if (IS_ERR(larval))
|
|
goto unlock;
|
|
|
|
hlist_add_head(&inst->list, &tmpl->instances);
|
|
inst->tmpl = tmpl;
|
|
|
|
unlock:
|
|
up_write(&crypto_alg_sem);
|
|
|
|
err = PTR_ERR(larval);
|
|
if (IS_ERR(larval))
|
|
goto err;
|
|
|
|
crypto_wait_for_test(larval);
|
|
err = 0;
|
|
|
|
err:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_instance);
|
|
|
|
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, 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_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);
|
|
|
|
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)
|
|
{
|
|
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);
|
|
|
|
void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int len)
|
|
{
|
|
int relalign = 0;
|
|
|
|
if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) {
|
|
int size = sizeof(unsigned long);
|
|
int d = (((unsigned long)dst ^ (unsigned long)src1) |
|
|
((unsigned long)dst ^ (unsigned long)src2)) &
|
|
(size - 1);
|
|
|
|
relalign = d ? 1 << __ffs(d) : size;
|
|
|
|
/*
|
|
* If we care about alignment, process as many bytes as
|
|
* needed to advance dst and src to values whose alignments
|
|
* equal their relative alignment. This will allow us to
|
|
* process the remainder of the input using optimal strides.
|
|
*/
|
|
while (((unsigned long)dst & (relalign - 1)) && len > 0) {
|
|
*dst++ = *src1++ ^ *src2++;
|
|
len--;
|
|
}
|
|
}
|
|
|
|
while (IS_ENABLED(CONFIG_64BIT) && len >= 8 && !(relalign & 7)) {
|
|
*(u64 *)dst = *(u64 *)src1 ^ *(u64 *)src2;
|
|
dst += 8;
|
|
src1 += 8;
|
|
src2 += 8;
|
|
len -= 8;
|
|
}
|
|
|
|
while (len >= 4 && !(relalign & 3)) {
|
|
*(u32 *)dst = *(u32 *)src1 ^ *(u32 *)src2;
|
|
dst += 4;
|
|
src1 += 4;
|
|
src2 += 4;
|
|
len -= 4;
|
|
}
|
|
|
|
while (len >= 2 && !(relalign & 1)) {
|
|
*(u16 *)dst = *(u16 *)src1 ^ *(u16 *)src2;
|
|
dst += 2;
|
|
src1 += 2;
|
|
src2 += 2;
|
|
len -= 2;
|
|
}
|
|
|
|
while (len--)
|
|
*dst++ = *src1++ ^ *src2++;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__crypto_xor);
|
|
|
|
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 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");
|