crypto/api.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  * Scatterlist Cryptographic API.
  *
  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  * Copyright (c) 2002 David S. Miller (davem@redhat.com)
  * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
  *
  * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
  * and Nettle, by Niels Möller.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
  * Software Foundation; either version 2 of the License, or (at your option)
  * any later version.
  *
  */

 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/kmod.h>
 #include <linux/module.h>
 #include <linux/param.h>
 #include <linux/sched/signal.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/completion.h>
 #include "internal.h"

 LIST_HEAD(crypto_alg_list);
 EXPORT_SYMBOL_GPL(crypto_alg_list);
 DECLARE_RWSEM(crypto_alg_sem);
 EXPORT_SYMBOL_GPL(crypto_alg_sem);

 BLOCKING_NOTIFIER_HEAD(crypto_chain);
 EXPORT_SYMBOL_GPL(crypto_chain);

 static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg);

 struct crypto_alg *crypto_mod_get(struct crypto_alg *alg)
 {
 	return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;
 }
 EXPORT_SYMBOL_GPL(crypto_mod_get);

 void crypto_mod_put(struct crypto_alg *alg)
 {
 	struct module *module = alg->cra_module;

 	crypto_alg_put(alg);
 	module_put(module);
 }
 EXPORT_SYMBOL_GPL(crypto_mod_put);

 static inline int crypto_is_test_larval(struct crypto_larval *larval)
 {
 	return larval->alg.cra_driver_name[0];
 }

 static struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type,
 					      u32 mask)
 {
 	struct crypto_alg *q, *alg = NULL;
 	int best = -2;

 	list_for_each_entry(q, &crypto_alg_list, cra_list) {
 		int exact, fuzzy;

 		if (crypto_is_moribund(q))
 			continue;

 		if ((q->cra_flags ^ type) & mask)
 			continue;

 		if (crypto_is_larval(q) &&
 		    !crypto_is_test_larval((struct crypto_larval *)q) &&
 		    ((struct crypto_larval *)q)->mask != mask)
 			continue;

 		exact = !strcmp(q->cra_driver_name, name);
 		fuzzy = !strcmp(q->cra_name, name);
 		if (!exact && !(fuzzy && q->cra_priority > best))
 			continue;

 		if (unlikely(!crypto_mod_get(q)))
 			continue;

 		best = q->cra_priority;
 		if (alg)
 			crypto_mod_put(alg);
 		alg = q;

 		if (exact)
 			break;
 	}

 	return alg;
 }

 static void crypto_larval_destroy(struct crypto_alg *alg)
 {
 	struct crypto_larval *larval = (void *)alg;

 	BUG_ON(!crypto_is_larval(alg));
 	if (larval->adult)
 		crypto_mod_put(larval->adult);
 	kfree(larval);
 }

 struct crypto_larval *crypto_larval_alloc(const char *name, u32 type, u32 mask)
 {
 	struct crypto_larval *larval;

 	larval = kzalloc(sizeof(*larval), GFP_KERNEL);
 	if (!larval)
 		return ERR_PTR(-ENOMEM);

 	larval->mask = mask;
 	larval->alg.cra_flags = CRYPTO_ALG_LARVAL | type;
 	larval->alg.cra_priority = -1;
 	larval->alg.cra_destroy = crypto_larval_destroy;

 	strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME);
 	init_completion(&larval->completion);

 	return larval;
 }
 EXPORT_SYMBOL_GPL(crypto_larval_alloc);

 static struct crypto_alg *crypto_larval_add(const char *name, u32 type,
 					    u32 mask)
 {
 	struct crypto_alg *alg;
 	struct crypto_larval *larval;

 	larval = crypto_larval_alloc(name, type, mask);
 	if (IS_ERR(larval))
 		return ERR_CAST(larval);

 	atomic_set(&larval->alg.cra_refcnt, 2);

 	down_write(&crypto_alg_sem);
 	alg = __crypto_alg_lookup(name, type, mask);
 	if (!alg) {
 		alg = &larval->alg;
 		list_add(&alg->cra_list, &crypto_alg_list);
 	}
 	up_write(&crypto_alg_sem);

 	if (alg != &larval->alg) {
 		kfree(larval);
 		if (crypto_is_larval(alg))
 			alg = crypto_larval_wait(alg);
 	}

 	return alg;
 }

 void crypto_larval_kill(struct crypto_alg *alg)
 {
 	struct crypto_larval *larval = (void *)alg;

 	down_write(&crypto_alg_sem);
 	list_del(&alg->cra_list);
 	up_write(&crypto_alg_sem);
 	complete_all(&larval->completion);
 	crypto_alg_put(alg);
 }
 EXPORT_SYMBOL_GPL(crypto_larval_kill);

 static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg)
 {
 	struct crypto_larval *larval = (void *)alg;
 	long timeout;

 	timeout = wait_for_completion_killable_timeout(
 		&larval->completion, 60 * HZ);

 	alg = larval->adult;
 	if (timeout < 0)
 		alg = ERR_PTR(-EINTR);
 	else if (!timeout)
 		alg = ERR_PTR(-ETIMEDOUT);
 	else if (!alg)
 		alg = ERR_PTR(-ENOENT);
 	else if (crypto_is_test_larval(larval) &&
 		 !(alg->cra_flags & CRYPTO_ALG_TESTED))
 		alg = ERR_PTR(-EAGAIN);
 	else if (!crypto_mod_get(alg))
 		alg = ERR_PTR(-EAGAIN);
 	crypto_mod_put(&larval->alg);

 	return alg;
 }

 struct crypto_alg *crypto_alg_lookup(const char *name, u32 type, u32 mask)
 {
 	struct crypto_alg *alg;

 	down_read(&crypto_alg_sem);
 	alg = __crypto_alg_lookup(name, type, mask);
 	up_read(&crypto_alg_sem);

 	return alg;
 }
 EXPORT_SYMBOL_GPL(crypto_alg_lookup);

 struct crypto_alg *crypto_larval_lookup(const char *name, u32 type, u32 mask)
 {
 	struct crypto_alg *alg;

 	if (!name)
 		return ERR_PTR(-ENOENT);

 	type &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);
 	mask &= ~(CRYPTO_ALG_LARVAL | CRYPTO_ALG_DEAD);

 	alg = crypto_alg_lookup(name, type, mask);
 	if (!alg && !(mask & CRYPTO_NOLOAD)) {
 		request_module("crypto-%s", name);

 		if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask &
 		      CRYPTO_ALG_NEED_FALLBACK))
 			request_module("crypto-%s-all", name);

 		alg = crypto_alg_lookup(name, type, mask);
 	}

 	if (alg)
 		return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg;

 	return crypto_larval_add(name, type, mask);
 }
 EXPORT_SYMBOL_GPL(crypto_larval_lookup);

 int crypto_probing_notify(unsigned long val, void *v)
 {
 	int ok;

 	ok = blocking_notifier_call_chain(&crypto_chain, val, v);
 	if (ok == NOTIFY_DONE) {
 		request_module("cryptomgr");
 		ok = blocking_notifier_call_chain(&crypto_chain, val, v);
 	}

 	return ok;
 }
 EXPORT_SYMBOL_GPL(crypto_probing_notify);

 struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask)
 {
 	struct crypto_alg *alg;
 	struct crypto_alg *larval;
 	int ok;

 	if (!((type | mask) & CRYPTO_ALG_TESTED)) {
 		type |= CRYPTO_ALG_TESTED;
 		mask |= CRYPTO_ALG_TESTED;
 	}

 	/*
 	 * If the internal flag is set for a cipher, require a caller to
 	 * to invoke the cipher with the internal flag to use that cipher.
 	 * Also, if a caller wants to allocate a cipher that may or may
 	 * not be an internal cipher, use type | CRYPTO_ALG_INTERNAL and
 	 * !(mask & CRYPTO_ALG_INTERNAL).
 	 */
 	if (!((type | mask) & CRYPTO_ALG_INTERNAL))
 		mask |= CRYPTO_ALG_INTERNAL;

 	larval = crypto_larval_lookup(name, type, mask);
 	if (IS_ERR(larval) || !crypto_is_larval(larval))
 		return larval;

 	ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval);

 	if (ok == NOTIFY_STOP)
 		alg = crypto_larval_wait(larval);
 	else {
 		crypto_mod_put(larval);
 		alg = ERR_PTR(-ENOENT);
 	}
 	crypto_larval_kill(larval);
 	return alg;
 }
 EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup);

 static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
 {
 	const struct crypto_type *type_obj = tfm->__crt_alg->cra_type;

 	if (type_obj)
 		return type_obj->init(tfm, type, mask);

 	switch (crypto_tfm_alg_type(tfm)) {
 	case CRYPTO_ALG_TYPE_CIPHER:
 		return crypto_init_cipher_ops(tfm);

 	case CRYPTO_ALG_TYPE_COMPRESS:
 		return crypto_init_compress_ops(tfm);

 	default:
 		break;
 	}

 	BUG();
 	return -EINVAL;
 }

 static void crypto_exit_ops(struct crypto_tfm *tfm)
 {
 	const struct crypto_type *type = tfm->__crt_alg->cra_type;

 	if (type && tfm->exit)
 		tfm->exit(tfm);
 }

 static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask)
 {
 	const struct crypto_type *type_obj = alg->cra_type;
 	unsigned int len;

 	len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);
 	if (type_obj)
 		return len + type_obj->ctxsize(alg, type, mask);

 	switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
 	default:
 		BUG();

 	case CRYPTO_ALG_TYPE_CIPHER:
 		len += crypto_cipher_ctxsize(alg);
 		break;

 	case CRYPTO_ALG_TYPE_COMPRESS:
 		len += crypto_compress_ctxsize(alg);
 		break;
 	}

 	return len;
 }

 void crypto_shoot_alg(struct crypto_alg *alg)
 {
 	down_write(&crypto_alg_sem);
 	alg->cra_flags |= CRYPTO_ALG_DYING;
 	up_write(&crypto_alg_sem);
 }
 EXPORT_SYMBOL_GPL(crypto_shoot_alg);

 struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type,
 				      u32 mask)
 {
 	struct crypto_tfm *tfm = NULL;
 	unsigned int tfm_size;
 	int err = -ENOMEM;

 	tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
 	tfm = kzalloc(tfm_size, GFP_KERNEL);
 	if (tfm == NULL)
 		goto out_err;

 	tfm->__crt_alg = alg;

 	err = crypto_init_ops(tfm, type, mask);
 	if (err)
 		goto out_free_tfm;

 	if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
 		goto cra_init_failed;

 	goto out;

 cra_init_failed:
 	crypto_exit_ops(tfm);
 out_free_tfm:
 	if (err == -EAGAIN)
 		crypto_shoot_alg(alg);
 	kfree(tfm);
 out_err:
 	tfm = ERR_PTR(err);
 out:
 	return tfm;
 }
 EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);

 /*
  *	crypto_alloc_base - Locate algorithm and allocate transform
  *	@alg_name: Name of algorithm
  *	@type: Type of algorithm
  *	@mask: Mask for type comparison
  *
  *	This function should not be used by new algorithm types.
  *	Please use crypto_alloc_tfm instead.
  *
  *	crypto_alloc_base() will first attempt to locate an already loaded
  *	algorithm.  If that fails and the kernel supports dynamically loadable
  *	modules, it will then attempt to load a module of the same name or
  *	alias.  If that fails it will send a query to any loaded crypto manager
  *	to construct an algorithm on the fly.  A refcount is grabbed on the
  *	algorithm which is then associated with the new transform.
  *
  *	The returned transform is of a non-determinate type.  Most people
  *	should use one of the more specific allocation functions such as
  *	crypto_alloc_blkcipher.
  *
  *	In case of error the return value is an error pointer.
  */
 struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask)
 {
 	struct crypto_tfm *tfm;
 	int err;

 	for (;;) {
 		struct crypto_alg *alg;

 		alg = crypto_alg_mod_lookup(alg_name, type, mask);
 		if (IS_ERR(alg)) {
 			err = PTR_ERR(alg);
 			goto err;
 		}

 		tfm = __crypto_alloc_tfm(alg, type, mask);
 		if (!IS_ERR(tfm))
 			return tfm;

 		crypto_mod_put(alg);
 		err = PTR_ERR(tfm);

 err:
 		if (err != -EAGAIN)
 			break;
 		if (fatal_signal_pending(current)) {
 			err = -EINTR;
 			break;
 		}
 	}

 	return ERR_PTR(err);
 }
 EXPORT_SYMBOL_GPL(crypto_alloc_base);

 void *crypto_create_tfm(struct crypto_alg *alg,
 			const struct crypto_type *frontend)
 {
 	char *mem;
 	struct crypto_tfm *tfm = NULL;
 	unsigned int tfmsize;
 	unsigned int total;
 	int err = -ENOMEM;

 	tfmsize = frontend->tfmsize;
 	total = tfmsize + sizeof(*tfm) + frontend->extsize(alg);

 	mem = kzalloc(total, GFP_KERNEL);
 	if (mem == NULL)
 		goto out_err;

 	tfm = (struct crypto_tfm *)(mem + tfmsize);
 	tfm->__crt_alg = alg;

 	err = frontend->init_tfm(tfm);
 	if (err)
 		goto out_free_tfm;

 	if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
 		goto cra_init_failed;

 	goto out;

 cra_init_failed:
 	crypto_exit_ops(tfm);
 out_free_tfm:
 	if (err == -EAGAIN)
 		crypto_shoot_alg(alg);
 	kfree(mem);
 out_err:
 	mem = ERR_PTR(err);
 out:
 	return mem;
 }
 EXPORT_SYMBOL_GPL(crypto_create_tfm);

 struct crypto_alg *crypto_find_alg(const char *alg_name,
 				   const struct crypto_type *frontend,
 				   u32 type, u32 mask)
 {
 	struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask) =
 		crypto_alg_mod_lookup;

 	if (frontend) {
 		type &= frontend->maskclear;
 		mask &= frontend->maskclear;
 		type |= frontend->type;
 		mask |= frontend->maskset;

 		if (frontend->lookup)
 			lookup = frontend->lookup;
 	}

 	return lookup(alg_name, type, mask);
 }
 EXPORT_SYMBOL_GPL(crypto_find_alg);

 /*
  *	crypto_alloc_tfm - Locate algorithm and allocate transform
  *	@alg_name: Name of algorithm
  *	@frontend: Frontend algorithm type
  *	@type: Type of algorithm
  *	@mask: Mask for type comparison
  *
  *	crypto_alloc_tfm() will first attempt to locate an already loaded
  *	algorithm.  If that fails and the kernel supports dynamically loadable
  *	modules, it will then attempt to load a module of the same name or
  *	alias.  If that fails it will send a query to any loaded crypto manager
  *	to construct an algorithm on the fly.  A refcount is grabbed on the
  *	algorithm which is then associated with the new transform.
  *
  *	The returned transform is of a non-determinate type.  Most people
  *	should use one of the more specific allocation functions such as
  *	crypto_alloc_blkcipher.
  *
  *	In case of error the return value is an error pointer.
  */
 void *crypto_alloc_tfm(const char *alg_name,
 		       const struct crypto_type *frontend, u32 type, u32 mask)
 {
 	void *tfm;
 	int err;

 	for (;;) {
 		struct crypto_alg *alg;

 		alg = crypto_find_alg(alg_name, frontend, type, mask);
 		if (IS_ERR(alg)) {
 			err = PTR_ERR(alg);
 			goto err;
 		}

 		tfm = crypto_create_tfm(alg, frontend);
 		if (!IS_ERR(tfm))
 			return tfm;

 		crypto_mod_put(alg);
 		err = PTR_ERR(tfm);

 err:
 		if (err != -EAGAIN)
 			break;
 		if (fatal_signal_pending(current)) {
 			err = -EINTR;
 			break;
 		}
 	}

 	return ERR_PTR(err);
 }
 EXPORT_SYMBOL_GPL(crypto_alloc_tfm);

 /*
  *	crypto_destroy_tfm - Free crypto transform
  *	@mem: Start of tfm slab
  *	@tfm: Transform to free
  *
  *	This function frees up the transform and any associated resources,
  *	then drops the refcount on the associated algorithm.
  */
 void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm)
 {
 	struct crypto_alg *alg;

 	if (unlikely(!mem))
 		return;

 	alg = tfm->__crt_alg;

 	if (!tfm->exit && alg->cra_exit)
 		alg->cra_exit(tfm);
 	crypto_exit_ops(tfm);
 	crypto_mod_put(alg);
 	kzfree(mem);
 }
 EXPORT_SYMBOL_GPL(crypto_destroy_tfm);

 int crypto_has_alg(const char *name, u32 type, u32 mask)
 {
 	int ret = 0;
 	struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);

 	if (!IS_ERR(alg)) {
 		crypto_mod_put(alg);
 		ret = 1;
 	}

 	return ret;
 }
 EXPORT_SYMBOL_GPL(crypto_has_alg);

 void crypto_req_done(struct crypto_async_request *req, int err)
 {
 	struct crypto_wait *wait = req->data;

 	if (err == -EINPROGRESS)
 		return;

 	wait->err = err;
 	complete(&wait->completion);
 }
 EXPORT_SYMBOL_GPL(crypto_req_done);

 MODULE_DESCRIPTION("Cryptographic core API");
 MODULE_LICENSE("GPL");
	/*
	* Scatterlist Cryptographic API.
	*
	* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
	* Copyright (c) 2002 David S. Miller (davem@redhat.com)
	* Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
	*
	* Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
	* and Nettle, by Niels Möller.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License as published by the Free
	* Software Foundation; either version 2 of the License, or (at your option)
	* any later version.
	*
	*/

	#include <linux/err.h>
	#include <linux/errno.h>
	#include <linux/kernel.h>
	#include <linux/kmod.h>
	#include <linux/module.h>
	#include <linux/param.h>
	#include <linux/sched/signal.h>
	#include <linux/slab.h>
	#include <linux/string.h>
	#include <linux/completion.h>
	#include "internal.h"

	LIST_HEAD(crypto_alg_list);
	EXPORT_SYMBOL_GPL(crypto_alg_list);
	DECLARE_RWSEM(crypto_alg_sem);
	EXPORT_SYMBOL_GPL(crypto_alg_sem);

	BLOCKING_NOTIFIER_HEAD(crypto_chain);
	EXPORT_SYMBOL_GPL(crypto_chain);

	static struct crypto_alg crypto_larval_wait(struct crypto_alg alg);

	struct crypto_alg crypto_mod_get(struct crypto_alg alg)
	{
	return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;
	}
	EXPORT_SYMBOL_GPL(crypto_mod_get);

	void crypto_mod_put(struct crypto_alg *alg)
	{
	struct module *module = alg->cra_module;

	crypto_alg_put(alg);
	module_put(module);
	}
	EXPORT_SYMBOL_GPL(crypto_mod_put);

	static inline int crypto_is_test_larval(struct crypto_larval *larval)
	{
	return larval->alg.cra_driver_name[0];
	}

	static struct crypto_alg __crypto_alg_lookup(const char name, u32 type,
	u32 mask)
	{
	struct crypto_alg q, alg = NULL;
	int best = -2;

	list_for_each_entry(q, &crypto_alg_list, cra_list) {
	int exact, fuzzy;

	if (crypto_is_moribund(q))
	continue;

	if ((q->cra_flags ^ type) & mask)
	continue;

	if (crypto_is_larval(q) &&
	!crypto_is_test_larval((struct crypto_larval *)q) &&
	((struct crypto_larval *)q)->mask != mask)
	continue;

	exact = !strcmp(q->cra_driver_name, name);
	fuzzy = !strcmp(q->cra_name, name);
	if (!exact && !(fuzzy && q->cra_priority > best))
	continue;

	if (unlikely(!crypto_mod_get(q)))
	continue;

	best = q->cra_priority;
	if (alg)
	crypto_mod_put(alg);
	alg = q;

	if (exact)
	break;
	}

	return alg;
	}

	static void crypto_larval_destroy(struct crypto_alg *alg)
	{
	struct crypto_larval larval = (void )alg;

	BUG_ON(!crypto_is_larval(alg));
	if (larval->adult)
	crypto_mod_put(larval->adult);
	kfree(larval);
	}

	struct crypto_larval crypto_larval_alloc(const char name, u32 type, u32 mask)
	{
	struct crypto_larval *larval;

	larval = kzalloc(sizeof(*larval), GFP_KERNEL);
	if (!larval)
	return ERR_PTR(-ENOMEM);

	larval->mask = mask;
	larval->alg.cra_flags = CRYPTO_ALG_LARVAL \| type;
	larval->alg.cra_priority = -1;
	larval->alg.cra_destroy = crypto_larval_destroy;

	strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME);
	init_completion(&larval->completion);

	return larval;
	}
	EXPORT_SYMBOL_GPL(crypto_larval_alloc);

	static struct crypto_alg crypto_larval_add(const char name, u32 type,
	u32 mask)
	{
	struct crypto_alg *alg;
	struct crypto_larval *larval;

	larval = crypto_larval_alloc(name, type, mask);
	if (IS_ERR(larval))
	return ERR_CAST(larval);

	atomic_set(&larval->alg.cra_refcnt, 2);

	down_write(&crypto_alg_sem);
	alg = __crypto_alg_lookup(name, type, mask);
	if (!alg) {
	alg = &larval->alg;
	list_add(&alg->cra_list, &crypto_alg_list);
	}
	up_write(&crypto_alg_sem);

	if (alg != &larval->alg) {
	kfree(larval);
	if (crypto_is_larval(alg))
	alg = crypto_larval_wait(alg);
	}

	return alg;
	}

	void crypto_larval_kill(struct crypto_alg *alg)
	{
	struct crypto_larval larval = (void )alg;

	down_write(&crypto_alg_sem);
	list_del(&alg->cra_list);
	up_write(&crypto_alg_sem);
	complete_all(&larval->completion);
	crypto_alg_put(alg);
	}
	EXPORT_SYMBOL_GPL(crypto_larval_kill);

	static struct crypto_alg crypto_larval_wait(struct crypto_alg alg)
	{
	struct crypto_larval larval = (void )alg;
	long timeout;

	timeout = wait_for_completion_killable_timeout(
	&larval->completion, 60 * HZ);

	alg = larval->adult;
	if (timeout < 0)
	alg = ERR_PTR(-EINTR);
	else if (!timeout)
	alg = ERR_PTR(-ETIMEDOUT);
	else if (!alg)
	alg = ERR_PTR(-ENOENT);
	else if (crypto_is_test_larval(larval) &&
	!(alg->cra_flags & CRYPTO_ALG_TESTED))
	alg = ERR_PTR(-EAGAIN);
	else if (!crypto_mod_get(alg))
	alg = ERR_PTR(-EAGAIN);
	crypto_mod_put(&larval->alg);

	return alg;
	}

	struct crypto_alg crypto_alg_lookup(const char name, u32 type, u32 mask)
	{
	struct crypto_alg *alg;

	down_read(&crypto_alg_sem);
	alg = __crypto_alg_lookup(name, type, mask);
	up_read(&crypto_alg_sem);

	return alg;
	}
	EXPORT_SYMBOL_GPL(crypto_alg_lookup);

	struct crypto_alg crypto_larval_lookup(const char name, u32 type, u32 mask)
	{
	struct crypto_alg *alg;

	if (!name)
	return ERR_PTR(-ENOENT);

	type &= ~(CRYPTO_ALG_LARVAL \| CRYPTO_ALG_DEAD);
	mask &= ~(CRYPTO_ALG_LARVAL \| CRYPTO_ALG_DEAD);

	alg = crypto_alg_lookup(name, type, mask);
	if (!alg && !(mask & CRYPTO_NOLOAD)) {
	request_module("crypto-%s", name);

	if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask &
	CRYPTO_ALG_NEED_FALLBACK))
	request_module("crypto-%s-all", name);

	alg = crypto_alg_lookup(name, type, mask);
	}

	if (alg)
	return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg;

	return crypto_larval_add(name, type, mask);
	}
	EXPORT_SYMBOL_GPL(crypto_larval_lookup);

	int crypto_probing_notify(unsigned long val, void *v)
	{
	int ok;

	ok = blocking_notifier_call_chain(&crypto_chain, val, v);
	if (ok == NOTIFY_DONE) {
	request_module("cryptomgr");
	ok = blocking_notifier_call_chain(&crypto_chain, val, v);
	}

	return ok;
	}
	EXPORT_SYMBOL_GPL(crypto_probing_notify);

	struct crypto_alg crypto_alg_mod_lookup(const char name, u32 type, u32 mask)
	{
	struct crypto_alg *alg;
	struct crypto_alg *larval;
	int ok;

	if (!((type \| mask) & CRYPTO_ALG_TESTED)) {
	type \|= CRYPTO_ALG_TESTED;
	mask \|= CRYPTO_ALG_TESTED;
	}

	/*
	* If the internal flag is set for a cipher, require a caller to
	* to invoke the cipher with the internal flag to use that cipher.
	* Also, if a caller wants to allocate a cipher that may or may
	* not be an internal cipher, use type \| CRYPTO_ALG_INTERNAL and
	* !(mask & CRYPTO_ALG_INTERNAL).
	*/
	if (!((type \| mask) & CRYPTO_ALG_INTERNAL))
	mask \|= CRYPTO_ALG_INTERNAL;

	larval = crypto_larval_lookup(name, type, mask);
	if (IS_ERR(larval) \|\| !crypto_is_larval(larval))
	return larval;

	ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval);

	if (ok == NOTIFY_STOP)
	alg = crypto_larval_wait(larval);
	else {
	crypto_mod_put(larval);
	alg = ERR_PTR(-ENOENT);
	}
	crypto_larval_kill(larval);
	return alg;
	}
	EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup);

	static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
	{
	const struct crypto_type *type_obj = tfm->__crt_alg->cra_type;

	if (type_obj)
	return type_obj->init(tfm, type, mask);

	switch (crypto_tfm_alg_type(tfm)) {
	case CRYPTO_ALG_TYPE_CIPHER:
	return crypto_init_cipher_ops(tfm);

	case CRYPTO_ALG_TYPE_COMPRESS:
	return crypto_init_compress_ops(tfm);

	default:
	break;
	}

	BUG();
	return -EINVAL;
	}

	static void crypto_exit_ops(struct crypto_tfm *tfm)
	{
	const struct crypto_type *type = tfm->__crt_alg->cra_type;

	if (type && tfm->exit)
	tfm->exit(tfm);
	}

	static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask)
	{
	const struct crypto_type *type_obj = alg->cra_type;
	unsigned int len;

	len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);
	if (type_obj)
	return len + type_obj->ctxsize(alg, type, mask);

	switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
	default:
	BUG();

	case CRYPTO_ALG_TYPE_CIPHER:
	len += crypto_cipher_ctxsize(alg);
	break;

	case CRYPTO_ALG_TYPE_COMPRESS:
	len += crypto_compress_ctxsize(alg);
	break;
	}

	return len;
	}

	void crypto_shoot_alg(struct crypto_alg *alg)
	{
	down_write(&crypto_alg_sem);
	alg->cra_flags \|= CRYPTO_ALG_DYING;
	up_write(&crypto_alg_sem);
	}
	EXPORT_SYMBOL_GPL(crypto_shoot_alg);

	struct crypto_tfm __crypto_alloc_tfm(struct crypto_alg alg, u32 type,
	u32 mask)
	{
	struct crypto_tfm *tfm = NULL;
	unsigned int tfm_size;
	int err = -ENOMEM;

	tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
	tfm = kzalloc(tfm_size, GFP_KERNEL);
	if (tfm == NULL)
	goto out_err;

	tfm->__crt_alg = alg;

	err = crypto_init_ops(tfm, type, mask);
	if (err)
	goto out_free_tfm;

	if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
	goto cra_init_failed;

	goto out;

	cra_init_failed:
	crypto_exit_ops(tfm);
	out_free_tfm:
	if (err == -EAGAIN)
	crypto_shoot_alg(alg);
	kfree(tfm);
	out_err:
	tfm = ERR_PTR(err);
	out:
	return tfm;
	}
	EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);

	/*
	* crypto_alloc_base - Locate algorithm and allocate transform
	* @alg_name: Name of algorithm
	* @type: Type of algorithm
	* @mask: Mask for type comparison
	*
	* This function should not be used by new algorithm types.
	* Please use crypto_alloc_tfm instead.
	*
	* crypto_alloc_base() will first attempt to locate an already loaded
	* algorithm. If that fails and the kernel supports dynamically loadable
	* modules, it will then attempt to load a module of the same name or
	* alias. If that fails it will send a query to any loaded crypto manager
	* to construct an algorithm on the fly. A refcount is grabbed on the
	* algorithm which is then associated with the new transform.
	*
	* The returned transform is of a non-determinate type. Most people
	* should use one of the more specific allocation functions such as
	* crypto_alloc_blkcipher.
	*
	* In case of error the return value is an error pointer.
	*/
	struct crypto_tfm crypto_alloc_base(const char alg_name, u32 type, u32 mask)
	{
	struct crypto_tfm *tfm;
	int err;

	for (;;) {
	struct crypto_alg *alg;

	alg = crypto_alg_mod_lookup(alg_name, type, mask);
	if (IS_ERR(alg)) {
	err = PTR_ERR(alg);
	goto err;
	}

	tfm = __crypto_alloc_tfm(alg, type, mask);
	if (!IS_ERR(tfm))
	return tfm;

	crypto_mod_put(alg);
	err = PTR_ERR(tfm);

	err:
	if (err != -EAGAIN)
	break;
	if (fatal_signal_pending(current)) {
	err = -EINTR;
	break;
	}
	}

	return ERR_PTR(err);
	}
	EXPORT_SYMBOL_GPL(crypto_alloc_base);

	void crypto_create_tfm(struct crypto_alg alg,
	const struct crypto_type *frontend)
	{
	char *mem;
	struct crypto_tfm *tfm = NULL;
	unsigned int tfmsize;
	unsigned int total;
	int err = -ENOMEM;

	tfmsize = frontend->tfmsize;
	total = tfmsize + sizeof(*tfm) + frontend->extsize(alg);

	mem = kzalloc(total, GFP_KERNEL);
	if (mem == NULL)
	goto out_err;

	tfm = (struct crypto_tfm *)(mem + tfmsize);
	tfm->__crt_alg = alg;

	err = frontend->init_tfm(tfm);
	if (err)
	goto out_free_tfm;

	if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
	goto cra_init_failed;

	goto out;

	cra_init_failed:
	crypto_exit_ops(tfm);
	out_free_tfm:
	if (err == -EAGAIN)
	crypto_shoot_alg(alg);
	kfree(mem);
	out_err:
	mem = ERR_PTR(err);
	out:
	return mem;
	}
	EXPORT_SYMBOL_GPL(crypto_create_tfm);

	struct crypto_alg crypto_find_alg(const char alg_name,
	const struct crypto_type *frontend,
	u32 type, u32 mask)
	{
	struct crypto_alg (lookup)(const char *name, u32 type, u32 mask) =
	crypto_alg_mod_lookup;

	if (frontend) {
	type &= frontend->maskclear;
	mask &= frontend->maskclear;
	type \|= frontend->type;
	mask \|= frontend->maskset;

	if (frontend->lookup)
	lookup = frontend->lookup;
	}

	return lookup(alg_name, type, mask);
	}
	EXPORT_SYMBOL_GPL(crypto_find_alg);

	/*
	* crypto_alloc_tfm - Locate algorithm and allocate transform
	* @alg_name: Name of algorithm
	* @frontend: Frontend algorithm type
	* @type: Type of algorithm
	* @mask: Mask for type comparison
	*
	* crypto_alloc_tfm() will first attempt to locate an already loaded
	* algorithm. If that fails and the kernel supports dynamically loadable
	* modules, it will then attempt to load a module of the same name or
	* alias. If that fails it will send a query to any loaded crypto manager
	* to construct an algorithm on the fly. A refcount is grabbed on the
	* algorithm which is then associated with the new transform.
	*
	* The returned transform is of a non-determinate type. Most people
	* should use one of the more specific allocation functions such as
	* crypto_alloc_blkcipher.
	*
	* In case of error the return value is an error pointer.
	*/
	void crypto_alloc_tfm(const char alg_name,
	const struct crypto_type *frontend, u32 type, u32 mask)
	{
	void *tfm;
	int err;

	for (;;) {
	struct crypto_alg *alg;

	alg = crypto_find_alg(alg_name, frontend, type, mask);
	if (IS_ERR(alg)) {
	err = PTR_ERR(alg);
	goto err;
	}

	tfm = crypto_create_tfm(alg, frontend);
	if (!IS_ERR(tfm))
	return tfm;

	crypto_mod_put(alg);
	err = PTR_ERR(tfm);

	err:
	if (err != -EAGAIN)
	break;
	if (fatal_signal_pending(current)) {
	err = -EINTR;
	break;
	}
	}

	return ERR_PTR(err);
	}
	EXPORT_SYMBOL_GPL(crypto_alloc_tfm);

	/*
	* crypto_destroy_tfm - Free crypto transform
	* @mem: Start of tfm slab
	* @tfm: Transform to free
	*
	* This function frees up the transform and any associated resources,
	* then drops the refcount on the associated algorithm.
	*/
	void crypto_destroy_tfm(void mem, struct crypto_tfm tfm)
	{
	struct crypto_alg *alg;

	if (unlikely(!mem))
	return;

	alg = tfm->__crt_alg;

	if (!tfm->exit && alg->cra_exit)
	alg->cra_exit(tfm);
	crypto_exit_ops(tfm);
	crypto_mod_put(alg);
	kzfree(mem);
	}
	EXPORT_SYMBOL_GPL(crypto_destroy_tfm);

	int crypto_has_alg(const char *name, u32 type, u32 mask)
	{
	int ret = 0;
	struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);

	if (!IS_ERR(alg)) {
	crypto_mod_put(alg);
	ret = 1;
	}

	return ret;
	}
	EXPORT_SYMBOL_GPL(crypto_has_alg);

	void crypto_req_done(struct crypto_async_request *req, int err)
	{
	struct crypto_wait *wait = req->data;

	if (err == -EINPROGRESS)
	return;

	wait->err = err;
	complete(&wait->completion);
	}
	EXPORT_SYMBOL_GPL(crypto_req_done);

	MODULE_DESCRIPTION("Cryptographic core API");
	MODULE_LICENSE("GPL");