[deliverable/linux.git] / crypto / api.c

/*
 * 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.h>
#include <linux/slab.h>
#include <linux/string.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);

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);

	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_interruptible_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);

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

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

		if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask &
		      CRYPTO_ALG_NEED_FALLBACK))
			request_module("%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;
	}

	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) {
		if (tfm->exit)
			tfm->exit(tfm);
		return;
	}

	switch (crypto_tfm_alg_type(tfm)) {
	case CRYPTO_ALG_TYPE_CIPHER:
		crypto_exit_cipher_ops(tfm);
		break;

	case CRYPTO_ALG_TYPE_COMPRESS:
		crypto_exit_compress_ops(tfm);
		break;

	default:
		BUG();
	}
}

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 (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 (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);

MODULE_DESCRIPTION("Cryptographic core API");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Scatterlist Cryptographic API.
	3	*
	4	* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
	5	* Copyright (c) 2002 David S. Miller (davem@redhat.com)
5cb1454b	6	* Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
1da177e4 LT	7	*
1da177e4 LT	8	* Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
991d1740	9	* and Nettle, by Niels Möller.
1da177e4 LT	10	*
	11	* This program is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU General Public License as published by the Free
3d01a33b	13	* Software Foundation; either version 2 of the License, or (at your option)
1da177e4 LT	14	* any later version.
	15	*
	16	*/
a61cc448	17
6bfd4809	18	#include <linux/err.h>
1da177e4	19	#include <linux/errno.h>
5cb1454b	20	#include <linux/kernel.h>
176c3652	21	#include <linux/kmod.h>
2b8c19db	22	#include <linux/module.h>
2825982d	23	#include <linux/param.h>
6bfd4809	24	#include <linux/sched.h>
1da177e4	25	#include <linux/slab.h>
5cb1454b	26	#include <linux/string.h>
1da177e4 LT	27	#include "internal.h"
	28
	29	LIST_HEAD(crypto_alg_list);
cce9e06d	30	EXPORT_SYMBOL_GPL(crypto_alg_list);
1da177e4	31	DECLARE_RWSEM(crypto_alg_sem);
cce9e06d	32	EXPORT_SYMBOL_GPL(crypto_alg_sem);
1da177e4	33
2825982d HX	34	BLOCKING_NOTIFIER_HEAD(crypto_chain);
	35	EXPORT_SYMBOL_GPL(crypto_chain);
	36
2825982d	37	struct crypto_alg crypto_mod_get(struct crypto_alg alg)
6521f302 HX	38	{
6521f302 HX	39	return try_module_get(alg->cra_module) ? crypto_alg_get(alg) : NULL;
1da177e4	40	}
2825982d	41	EXPORT_SYMBOL_GPL(crypto_mod_get);
1da177e4	42
2825982d	43	void crypto_mod_put(struct crypto_alg *alg)
1da177e4	44	{
da7cd59a HX	45	struct module *module = alg->cra_module;
da7cd59a HX	46
6521f302	47	crypto_alg_put(alg);
da7cd59a	48	module_put(module);
1da177e4	49	}
2825982d	50	EXPORT_SYMBOL_GPL(crypto_mod_put);
1da177e4	51
73d3864a HX	52	static inline int crypto_is_test_larval(struct crypto_larval *larval)
	53	{
	54	return larval->alg.cra_driver_name[0];
	55	}
	56
c51b6c81 HX	57	static struct crypto_alg __crypto_alg_lookup(const char name, u32 type,
c51b6c81 HX	58	u32 mask)
1da177e4 LT	59	{
1da177e4 LT	60	struct crypto_alg q, alg = NULL;
2825982d	61	int best = -2;
1da177e4	62
1da177e4	63	list_for_each_entry(q, &crypto_alg_list, cra_list) {
5cb1454b HX	64	int exact, fuzzy;
5cb1454b HX	65
6bfd4809 HX	66	if (crypto_is_moribund(q))
	67	continue;
	68
492e2b63 HX	69	if ((q->cra_flags ^ type) & mask)
	70	continue;
	71
	72	if (crypto_is_larval(q) &&
73d3864a	73	!crypto_is_test_larval((struct crypto_larval *)q) &&
492e2b63 HX	74	((struct crypto_larval *)q)->mask != mask)
	75	continue;
	76
5cb1454b HX	77	exact = !strcmp(q->cra_driver_name, name);
	78	fuzzy = !strcmp(q->cra_name, name);
	79	if (!exact && !(fuzzy && q->cra_priority > best))
	80	continue;
	81
72fa4919	82	if (unlikely(!crypto_mod_get(q)))
5cb1454b HX	83	continue;
	84
	85	best = q->cra_priority;
	86	if (alg)
72fa4919	87	crypto_mod_put(alg);
5cb1454b HX	88	alg = q;
	89
	90	if (exact)
1da177e4	91	break;
1da177e4	92	}
2825982d HX	93
	94	return alg;
	95	}
2825982d HX	96
	97	static void crypto_larval_destroy(struct crypto_alg *alg)
	98	{
	99	struct crypto_larval larval = (void )alg;
	100
	101	BUG_ON(!crypto_is_larval(alg));
	102	if (larval->adult)
	103	crypto_mod_put(larval->adult);
	104	kfree(larval);
	105	}
	106
73d3864a	107	struct crypto_larval crypto_larval_alloc(const char name, u32 type, u32 mask)
2825982d	108	{
2825982d HX	109	struct crypto_larval *larval;
	110
	111	larval = kzalloc(sizeof(*larval), GFP_KERNEL);
	112	if (!larval)
6bfd4809	113	return ERR_PTR(-ENOMEM);
2825982d	114
492e2b63 HX	115	larval->mask = mask;
492e2b63 HX	116	larval->alg.cra_flags = CRYPTO_ALG_LARVAL \| type;
2825982d HX	117	larval->alg.cra_priority = -1;
	118	larval->alg.cra_destroy = crypto_larval_destroy;
	119
2825982d HX	120	strlcpy(larval->alg.cra_name, name, CRYPTO_MAX_ALG_NAME);
	121	init_completion(&larval->completion);
	122
73d3864a HX	123	return larval;
	124	}
	125	EXPORT_SYMBOL_GPL(crypto_larval_alloc);
	126
	127	static struct crypto_alg crypto_larval_add(const char name, u32 type,
	128	u32 mask)
	129	{
	130	struct crypto_alg *alg;
	131	struct crypto_larval *larval;
	132
	133	larval = crypto_larval_alloc(name, type, mask);
	134	if (IS_ERR(larval))
	135	return ERR_CAST(larval);
	136
	137	atomic_set(&larval->alg.cra_refcnt, 2);
	138
2825982d	139	down_write(&crypto_alg_sem);
492e2b63	140	alg = __crypto_alg_lookup(name, type, mask);
2825982d HX	141	if (!alg) {
	142	alg = &larval->alg;
	143	list_add(&alg->cra_list, &crypto_alg_list);
	144	}
	145	up_write(&crypto_alg_sem);
	146
	147	if (alg != &larval->alg)
	148	kfree(larval);
	149
	150	return alg;
	151	}
	152
b9c55aa4	153	void crypto_larval_kill(struct crypto_alg *alg)
2825982d HX	154	{
	155	struct crypto_larval larval = (void )alg;
	156
	157	down_write(&crypto_alg_sem);
	158	list_del(&alg->cra_list);
	159	up_write(&crypto_alg_sem);
fe3c5206	160	complete_all(&larval->completion);
2825982d HX	161	crypto_alg_put(alg);
2825982d HX	162	}
b9c55aa4	163	EXPORT_SYMBOL_GPL(crypto_larval_kill);
2825982d HX	164
	165	static struct crypto_alg crypto_larval_wait(struct crypto_alg alg)
	166	{
	167	struct crypto_larval larval = (void )alg;
73d3864a HX	168	long timeout;
	169
	170	timeout = wait_for_completion_interruptible_timeout(
	171	&larval->completion, 60 * HZ);
2825982d	172
2825982d	173	alg = larval->adult;
73d3864a HX	174	if (timeout < 0)
	175	alg = ERR_PTR(-EINTR);
	176	else if (!timeout)
	177	alg = ERR_PTR(-ETIMEDOUT);
	178	else if (!alg)
6bfd4809	179	alg = ERR_PTR(-ENOENT);
73d3864a HX	180	else if (crypto_is_test_larval(larval) &&
	181	!(alg->cra_flags & CRYPTO_ALG_TESTED))
	182	alg = ERR_PTR(-EAGAIN);
	183	else if (!crypto_mod_get(alg))
	184	alg = ERR_PTR(-EAGAIN);
2825982d HX	185	crypto_mod_put(&larval->alg);
	186
	187	return alg;
	188	}
	189
c51b6c81	190	struct crypto_alg crypto_alg_lookup(const char name, u32 type, u32 mask)
2825982d HX	191	{
	192	struct crypto_alg *alg;
	193
2825982d	194	down_read(&crypto_alg_sem);
492e2b63	195	alg = __crypto_alg_lookup(name, type, mask);
1da177e4	196	up_read(&crypto_alg_sem);
2825982d	197
1da177e4 LT	198	return alg;
1da177e4 LT	199	}
c51b6c81	200	EXPORT_SYMBOL_GPL(crypto_alg_lookup);
1da177e4	201
b9c55aa4	202	struct crypto_alg crypto_larval_lookup(const char name, u32 type, u32 mask)
176c3652	203	{
2825982d	204	struct crypto_alg *alg;
2825982d	205
6bfd4809 HX	206	if (!name)
	207	return ERR_PTR(-ENOENT);
	208
	209	mask &= ~(CRYPTO_ALG_LARVAL \| CRYPTO_ALG_DEAD);
492e2b63 HX	210	type &= mask;
492e2b63 HX	211
a760a665 HX	212	alg = crypto_alg_lookup(name, type, mask);
a760a665 HX	213	if (!alg) {
aa07a699	214	request_module("%s", name);
a760a665	215
37fc334c	216	if (!((type ^ CRYPTO_ALG_NEED_FALLBACK) & mask &
aa07a699 AR	217	CRYPTO_ALG_NEED_FALLBACK))
aa07a699 AR	218	request_module("%s-all", name);
a760a665 HX	219
	220	alg = crypto_alg_lookup(name, type, mask);
	221	}
	222
2825982d HX	223	if (alg)
	224	return crypto_is_larval(alg) ? crypto_larval_wait(alg) : alg;
	225
73d3864a	226	return crypto_larval_add(name, type, mask);
b9c55aa4 HX	227	}
	228	EXPORT_SYMBOL_GPL(crypto_larval_lookup);
	229
73d3864a HX	230	int crypto_probing_notify(unsigned long val, void *v)
	231	{
	232	int ok;
	233
	234	ok = blocking_notifier_call_chain(&crypto_chain, val, v);
	235	if (ok == NOTIFY_DONE) {
	236	request_module("cryptomgr");
	237	ok = blocking_notifier_call_chain(&crypto_chain, val, v);
	238	}
	239
	240	return ok;
	241	}
	242	EXPORT_SYMBOL_GPL(crypto_probing_notify);
	243
b9c55aa4 HX	244	struct crypto_alg crypto_alg_mod_lookup(const char name, u32 type, u32 mask)
	245	{
	246	struct crypto_alg *alg;
	247	struct crypto_alg *larval;
	248	int ok;
	249
ff753308	250	if (!((type \| mask) & CRYPTO_ALG_TESTED)) {
73d3864a HX	251	type \|= CRYPTO_ALG_TESTED;
	252	mask \|= CRYPTO_ALG_TESTED;
	253	}
	254
b9c55aa4	255	larval = crypto_larval_lookup(name, type, mask);
6bfd4809	256	if (IS_ERR(larval) \|\| !crypto_is_larval(larval))
2825982d HX	257	return larval;
2825982d HX	258
73d3864a	259	ok = crypto_probing_notify(CRYPTO_MSG_ALG_REQUEST, larval);
2b8c19db HX	260
2b8c19db HX	261	if (ok == NOTIFY_STOP)
2825982d HX	262	alg = crypto_larval_wait(larval);
	263	else {
	264	crypto_mod_put(larval);
6bfd4809	265	alg = ERR_PTR(-ENOENT);
2825982d HX	266	}
	267	crypto_larval_kill(larval);
	268	return alg;
176c3652	269	}
492e2b63	270	EXPORT_SYMBOL_GPL(crypto_alg_mod_lookup);
176c3652	271
27d2a330	272	static int crypto_init_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
1da177e4	273	{
27d2a330	274	const struct crypto_type *type_obj = tfm->__crt_alg->cra_type;
e853c3cf	275
27d2a330 HX	276	if (type_obj)
27d2a330 HX	277	return type_obj->init(tfm, type, mask);
e853c3cf	278
1da177e4 LT	279	switch (crypto_tfm_alg_type(tfm)) {
	280	case CRYPTO_ALG_TYPE_CIPHER:
	281	return crypto_init_cipher_ops(tfm);
004a403c	282
1da177e4 LT	283	case CRYPTO_ALG_TYPE_COMPRESS:
1da177e4 LT	284	return crypto_init_compress_ops(tfm);
3d01a33b	285
1da177e4 LT	286	default:
	287	break;
	288	}
3d01a33b	289
1da177e4 LT	290	BUG();
	291	return -EINVAL;
	292	}
	293
	294	static void crypto_exit_ops(struct crypto_tfm *tfm)
	295	{
e853c3cf HX	296	const struct crypto_type *type = tfm->__crt_alg->cra_type;
	297
	298	if (type) {
4a779486 HX	299	if (tfm->exit)
4a779486 HX	300	tfm->exit(tfm);
e853c3cf HX	301	return;
	302	}
	303
1da177e4 LT	304	switch (crypto_tfm_alg_type(tfm)) {
	305	case CRYPTO_ALG_TYPE_CIPHER:
	306	crypto_exit_cipher_ops(tfm);
	307	break;
6941c3a0	308
1da177e4 LT	309	case CRYPTO_ALG_TYPE_COMPRESS:
	310	crypto_exit_compress_ops(tfm);
	311	break;
3d01a33b	312
1da177e4 LT	313	default:
1da177e4 LT	314	BUG();
1da177e4 LT	315	}
	316	}
	317
27d2a330	318	static unsigned int crypto_ctxsize(struct crypto_alg *alg, u32 type, u32 mask)
fbdae9f3	319	{
27d2a330	320	const struct crypto_type *type_obj = alg->cra_type;
fbdae9f3 HX	321	unsigned int len;
fbdae9f3 HX	322
e853c3cf	323	len = alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1);
27d2a330 HX	324	if (type_obj)
27d2a330 HX	325	return len + type_obj->ctxsize(alg, type, mask);
e853c3cf	326
fbdae9f3 HX	327	switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
	328	default:
	329	BUG();
	330
	331	case CRYPTO_ALG_TYPE_CIPHER:
f1ddcaf3	332	len += crypto_cipher_ctxsize(alg);
fbdae9f3	333	break;
6941c3a0	334
fbdae9f3	335	case CRYPTO_ALG_TYPE_COMPRESS:
f1ddcaf3	336	len += crypto_compress_ctxsize(alg);
fbdae9f3 HX	337	break;
	338	}
	339
e853c3cf	340	return len;
fbdae9f3 HX	341	}
fbdae9f3 HX	342
6bfd4809 HX	343	void crypto_shoot_alg(struct crypto_alg *alg)
	344	{
	345	down_write(&crypto_alg_sem);
	346	alg->cra_flags \|= CRYPTO_ALG_DYING;
	347	up_write(&crypto_alg_sem);
	348	}
	349	EXPORT_SYMBOL_GPL(crypto_shoot_alg);
	350
27d2a330 HX	351	struct crypto_tfm __crypto_alloc_tfm(struct crypto_alg alg, u32 type,
27d2a330 HX	352	u32 mask)
1da177e4 LT	353	{
1da177e4 LT	354	struct crypto_tfm *tfm = NULL;
fbdae9f3	355	unsigned int tfm_size;
6bfd4809	356	int err = -ENOMEM;
fbdae9f3	357
27d2a330	358	tfm_size = sizeof(*tfm) + crypto_ctxsize(alg, type, mask);
bbeb563f	359	tfm = kzalloc(tfm_size, GFP_KERNEL);
1da177e4	360	if (tfm == NULL)
9765d262	361	goto out_err;
1da177e4	362
1da177e4	363	tfm->__crt_alg = alg;
6bfd4809	364
27d2a330	365	err = crypto_init_ops(tfm, type, mask);
6bfd4809	366	if (err)
1da177e4	367	goto out_free_tfm;
c7fc0599	368
4a779486	369	if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
c7fc0599	370	goto cra_init_failed;
1da177e4 LT	371
	372	goto out;
	373
c7fc0599 HX	374	cra_init_failed:
c7fc0599 HX	375	crypto_exit_ops(tfm);
1da177e4	376	out_free_tfm:
4a779486 HX	377	if (err == -EAGAIN)
4a779486 HX	378	crypto_shoot_alg(alg);
1da177e4	379	kfree(tfm);
9765d262	380	out_err:
6bfd4809	381	tfm = ERR_PTR(err);
1da177e4 LT	382	out:
	383	return tfm;
	384	}
6bfd4809 HX	385	EXPORT_SYMBOL_GPL(__crypto_alloc_tfm);
6bfd4809 HX	386
6d7d684d HX	387	/*
	388	* crypto_alloc_base - Locate algorithm and allocate transform
	389	* @alg_name: Name of algorithm
	390	* @type: Type of algorithm
	391	* @mask: Mask for type comparison
	392	*
7b0bac64	393	* This function should not be used by new algorithm types.
fd1a1900	394	* Please use crypto_alloc_tfm instead.
7b0bac64	395	*
6d7d684d HX	396	* crypto_alloc_base() will first attempt to locate an already loaded
	397	* algorithm. If that fails and the kernel supports dynamically loadable
	398	* modules, it will then attempt to load a module of the same name or
	399	* alias. If that fails it will send a query to any loaded crypto manager
	400	* to construct an algorithm on the fly. A refcount is grabbed on the
	401	* algorithm which is then associated with the new transform.
	402	*
	403	* The returned transform is of a non-determinate type. Most people
	404	* should use one of the more specific allocation functions such as
	405	* crypto_alloc_blkcipher.
	406	*
	407	* In case of error the return value is an error pointer.
	408	*/
	409	struct crypto_tfm crypto_alloc_base(const char alg_name, u32 type, u32 mask)
	410	{
	411	struct crypto_tfm *tfm;
	412	int err;
	413
	414	for (;;) {
	415	struct crypto_alg *alg;
	416
	417	alg = crypto_alg_mod_lookup(alg_name, type, mask);
9765d262 AM	418	if (IS_ERR(alg)) {
9765d262 AM	419	err = PTR_ERR(alg);
6d7d684d	420	goto err;
9765d262	421	}
6d7d684d	422
27d2a330	423	tfm = __crypto_alloc_tfm(alg, type, mask);
6d7d684d	424	if (!IS_ERR(tfm))
9765d262	425	return tfm;
6d7d684d HX	426
	427	crypto_mod_put(alg);
	428	err = PTR_ERR(tfm);
	429
	430	err:
	431	if (err != -EAGAIN)
	432	break;
	433	if (signal_pending(current)) {
	434	err = -EINTR;
	435	break;
	436	}
9765d262	437	}
6d7d684d	438
9765d262	439	return ERR_PTR(err);
6d7d684d HX	440	}
6d7d684d HX	441	EXPORT_SYMBOL_GPL(crypto_alloc_base);
7b0bac64	442
3f683d61 HX	443	void crypto_create_tfm(struct crypto_alg alg,
3f683d61 HX	444	const struct crypto_type *frontend)
7b0bac64 HX	445	{
	446	char *mem;
	447	struct crypto_tfm *tfm = NULL;
	448	unsigned int tfmsize;
	449	unsigned int total;
	450	int err = -ENOMEM;
	451
	452	tfmsize = frontend->tfmsize;
2ca33da1	453	total = tfmsize + sizeof(*tfm) + frontend->extsize(alg);
7b0bac64 HX	454
	455	mem = kzalloc(total, GFP_KERNEL);
	456	if (mem == NULL)
	457	goto out_err;
	458
	459	tfm = (struct crypto_tfm *)(mem + tfmsize);
	460	tfm->__crt_alg = alg;
	461
2ca33da1	462	err = frontend->init_tfm(tfm);
7b0bac64 HX	463	if (err)
	464	goto out_free_tfm;
	465
	466	if (!tfm->exit && alg->cra_init && (err = alg->cra_init(tfm)))
	467	goto cra_init_failed;
	468
	469	goto out;
	470
	471	cra_init_failed:
	472	crypto_exit_ops(tfm);
	473	out_free_tfm:
	474	if (err == -EAGAIN)
	475	crypto_shoot_alg(alg);
	476	kfree(mem);
	477	out_err:
3f683d61	478	mem = ERR_PTR(err);
7b0bac64	479	out:
3f683d61	480	return mem;
7b0bac64 HX	481	}
	482	EXPORT_SYMBOL_GPL(crypto_create_tfm);
	483
d06854f0 HX	484	struct crypto_alg crypto_find_alg(const char alg_name,
	485	const struct crypto_type *frontend,
	486	u32 type, u32 mask)
	487	{
	488	struct crypto_alg (lookup)(const char *name, u32 type, u32 mask) =
	489	crypto_alg_mod_lookup;
	490
	491	if (frontend) {
	492	type &= frontend->maskclear;
	493	mask &= frontend->maskclear;
	494	type \|= frontend->type;
	495	mask \|= frontend->maskset;
	496
	497	if (frontend->lookup)
	498	lookup = frontend->lookup;
	499	}
	500
	501	return lookup(alg_name, type, mask);
	502	}
	503	EXPORT_SYMBOL_GPL(crypto_find_alg);
	504
7b0bac64 HX	505	/*
	506	* crypto_alloc_tfm - Locate algorithm and allocate transform
	507	* @alg_name: Name of algorithm
	508	* @frontend: Frontend algorithm type
	509	* @type: Type of algorithm
	510	* @mask: Mask for type comparison
	511	*
	512	* crypto_alloc_tfm() will first attempt to locate an already loaded
	513	* algorithm. If that fails and the kernel supports dynamically loadable
	514	* modules, it will then attempt to load a module of the same name or
	515	* alias. If that fails it will send a query to any loaded crypto manager
	516	* to construct an algorithm on the fly. A refcount is grabbed on the
	517	* algorithm which is then associated with the new transform.
	518	*
	519	* The returned transform is of a non-determinate type. Most people
	520	* should use one of the more specific allocation functions such as
	521	* crypto_alloc_blkcipher.
	522	*
	523	* In case of error the return value is an error pointer.
	524	*/
3f683d61 HX	525	void crypto_alloc_tfm(const char alg_name,
3f683d61 HX	526	const struct crypto_type *frontend, u32 type, u32 mask)
7b0bac64	527	{
3f683d61	528	void *tfm;
7b0bac64 HX	529	int err;
7b0bac64 HX	530
7b0bac64 HX	531	for (;;) {
	532	struct crypto_alg *alg;
	533
d06854f0	534	alg = crypto_find_alg(alg_name, frontend, type, mask);
7b0bac64 HX	535	if (IS_ERR(alg)) {
	536	err = PTR_ERR(alg);
	537	goto err;
	538	}
	539
	540	tfm = crypto_create_tfm(alg, frontend);
	541	if (!IS_ERR(tfm))
	542	return tfm;
	543
	544	crypto_mod_put(alg);
	545	err = PTR_ERR(tfm);
	546
	547	err:
	548	if (err != -EAGAIN)
	549	break;
	550	if (signal_pending(current)) {
	551	err = -EINTR;
	552	break;
	553	}
	554	}
	555
	556	return ERR_PTR(err);
	557	}
	558	EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
7b2cd92a	559
6d7d684d	560	/*
7b2cd92a HX	561	* crypto_destroy_tfm - Free crypto transform
7b2cd92a HX	562	* @mem: Start of tfm slab
6d7d684d HX	563	* @tfm: Transform to free
6d7d684d HX	564	*
7b2cd92a	565	* This function frees up the transform and any associated resources,
6d7d684d HX	566	* then drops the refcount on the associated algorithm.
6d7d684d HX	567	*/
7b2cd92a	568	void crypto_destroy_tfm(void mem, struct crypto_tfm tfm)
1da177e4	569	{
a61cc448	570	struct crypto_alg *alg;
a61cc448	571
7b2cd92a	572	if (unlikely(!mem))
a61cc448 JJ	573	return;
	574
	575	alg = tfm->__crt_alg;
1da177e4	576
4a779486	577	if (!tfm->exit && alg->cra_exit)
c7fc0599	578	alg->cra_exit(tfm);
1da177e4	579	crypto_exit_ops(tfm);
72fa4919	580	crypto_mod_put(alg);
811d8f06	581	kzfree(mem);
1da177e4	582	}
7b2cd92a	583	EXPORT_SYMBOL_GPL(crypto_destroy_tfm);
fce32d70 HX	584
	585	int crypto_has_alg(const char *name, u32 type, u32 mask)
	586	{
	587	int ret = 0;
	588	struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);
3d01a33b	589
fce32d70 HX	590	if (!IS_ERR(alg)) {
	591	crypto_mod_put(alg);
	592	ret = 1;
	593	}
3d01a33b	594
fce32d70 HX	595	return ret;
	596	}
	597	EXPORT_SYMBOL_GPL(crypto_has_alg);
c3715cb9 SS	598
	599	MODULE_DESCRIPTION("Cryptographic core API");
	600	MODULE_LICENSE("GPL");