[GitHub/mt8127/android_kernel_alcatel_ttab.git] / crypto / ablkcipher.c

/*
 * Asynchronous block chaining cipher operations.
 *
 * This is the asynchronous version of blkcipher.c indicating completion
 * via a callback.
 *
 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#include <crypto/internal/skcipher.h>
#include <linux/cpumask.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rtnetlink.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/seq_file.h>

#include <crypto/scatterwalk.h>

#include "internal.h"

static const char *skcipher_default_geniv __read_mostly;

struct ablkcipher_buffer {
	struct list_head	entry;
	struct scatter_walk	dst;
	unsigned int		len;
	void			*data;
};

enum {
	ABLKCIPHER_WALK_SLOW = 1 << 0,
};

static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p)
{
	scatterwalk_copychunks(p->data, &p->dst, p->len, 1);
}

void __ablkcipher_walk_complete(struct ablkcipher_walk *walk)
{
	struct ablkcipher_buffer *p, *tmp;

	list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {
		ablkcipher_buffer_write(p);
		list_del(&p->entry);
		kfree(p);
	}
}
EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete);

static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk,
					  struct ablkcipher_buffer *p)
{
	p->dst = walk->out;
	list_add_tail(&p->entry, &walk->buffers);
}

/* Get a spot of the specified length that does not straddle a page.
 * The caller needs to ensure that there is enough space for this operation.
 */
static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len)
{
	u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
	return max(start, end_page);
}

static inline unsigned int ablkcipher_done_slow(struct ablkcipher_walk *walk,
						unsigned int bsize)
{
	unsigned int n = bsize;

	for (;;) {
		unsigned int len_this_page = scatterwalk_pagelen(&walk->out);

		if (len_this_page > n)
			len_this_page = n;
		scatterwalk_advance(&walk->out, n);
		if (n == len_this_page)
			break;
		n -= len_this_page;
		scatterwalk_start(&walk->out, scatterwalk_sg_next(walk->out.sg));
	}

	return bsize;
}

static inline unsigned int ablkcipher_done_fast(struct ablkcipher_walk *walk,
						unsigned int n)
{
	scatterwalk_advance(&walk->in, n);
	scatterwalk_advance(&walk->out, n);

	return n;
}

static int ablkcipher_walk_next(struct ablkcipher_request *req,
				struct ablkcipher_walk *walk);

int ablkcipher_walk_done(struct ablkcipher_request *req,
			 struct ablkcipher_walk *walk, int err)
{
	struct crypto_tfm *tfm = req->base.tfm;
	unsigned int nbytes = 0;

	if (likely(err >= 0)) {
		unsigned int n = walk->nbytes - err;

		if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW)))
			n = ablkcipher_done_fast(walk, n);
		else if (WARN_ON(err)) {
			err = -EINVAL;
			goto err;
		} else
			n = ablkcipher_done_slow(walk, n);

		nbytes = walk->total - n;
		err = 0;
	}

	scatterwalk_done(&walk->in, 0, nbytes);
	scatterwalk_done(&walk->out, 1, nbytes);

err:
	walk->total = nbytes;
	walk->nbytes = nbytes;

	if (nbytes) {
		crypto_yield(req->base.flags);
		return ablkcipher_walk_next(req, walk);
	}

	if (walk->iv != req->info)
		memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize);
	kfree(walk->iv_buffer);

	return err;
}
EXPORT_SYMBOL_GPL(ablkcipher_walk_done);

static inline int ablkcipher_next_slow(struct ablkcipher_request *req,
				       struct ablkcipher_walk *walk,
				       unsigned int bsize,
				       unsigned int alignmask,
				       void **src_p, void **dst_p)
{
	unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
	struct ablkcipher_buffer *p;
	void *src, *dst, *base;
	unsigned int n;

	n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1);
	n += (aligned_bsize * 3 - (alignmask + 1) +
	      (alignmask & ~(crypto_tfm_ctx_alignment() - 1)));

	p = kmalloc(n, GFP_ATOMIC);
	if (!p)
		return ablkcipher_walk_done(req, walk, -ENOMEM);

	base = p + 1;

	dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1);
	src = dst = ablkcipher_get_spot(dst, bsize);

	p->len = bsize;
	p->data = dst;

	scatterwalk_copychunks(src, &walk->in, bsize, 0);

	ablkcipher_queue_write(walk, p);

	walk->nbytes = bsize;
	walk->flags |= ABLKCIPHER_WALK_SLOW;

	*src_p = src;
	*dst_p = dst;

	return 0;
}

static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk,
				     struct crypto_tfm *tfm,
				     unsigned int alignmask)
{
	unsigned bs = walk->blocksize;
	unsigned int ivsize = tfm->crt_ablkcipher.ivsize;
	unsigned aligned_bs = ALIGN(bs, alignmask + 1);
	unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
			    (alignmask + 1);
	u8 *iv;

	size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
	walk->iv_buffer = kmalloc(size, GFP_ATOMIC);
	if (!walk->iv_buffer)
		return -ENOMEM;

	iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1);
	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
	iv = ablkcipher_get_spot(iv, ivsize);

	walk->iv = memcpy(iv, walk->iv, ivsize);
	return 0;
}

static inline int ablkcipher_next_fast(struct ablkcipher_request *req,
				       struct ablkcipher_walk *walk)
{
	walk->src.page = scatterwalk_page(&walk->in);
	walk->src.offset = offset_in_page(walk->in.offset);
	walk->dst.page = scatterwalk_page(&walk->out);
	walk->dst.offset = offset_in_page(walk->out.offset);

	return 0;
}

static int ablkcipher_walk_next(struct ablkcipher_request *req,
				struct ablkcipher_walk *walk)
{
	struct crypto_tfm *tfm = req->base.tfm;
	unsigned int alignmask, bsize, n;
	void *src, *dst;
	int err;

	alignmask = crypto_tfm_alg_alignmask(tfm);
	n = walk->total;
	if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) {
		req->base.flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
		return ablkcipher_walk_done(req, walk, -EINVAL);
	}

	walk->flags &= ~ABLKCIPHER_WALK_SLOW;
	src = dst = NULL;

	bsize = min(walk->blocksize, n);
	n = scatterwalk_clamp(&walk->in, n);
	n = scatterwalk_clamp(&walk->out, n);

	if (n < bsize ||
	    !scatterwalk_aligned(&walk->in, alignmask) ||
	    !scatterwalk_aligned(&walk->out, alignmask)) {
		err = ablkcipher_next_slow(req, walk, bsize, alignmask,
					   &src, &dst);
		goto set_phys_lowmem;
	}

	walk->nbytes = n;

	return ablkcipher_next_fast(req, walk);

set_phys_lowmem:
	if (err >= 0) {
		walk->src.page = virt_to_page(src);
		walk->dst.page = virt_to_page(dst);
		walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1));
		walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1));
	}

	return err;
}

static int ablkcipher_walk_first(struct ablkcipher_request *req,
				 struct ablkcipher_walk *walk)
{
	struct crypto_tfm *tfm = req->base.tfm;
	unsigned int alignmask;

	alignmask = crypto_tfm_alg_alignmask(tfm);
	if (WARN_ON_ONCE(in_irq()))
		return -EDEADLK;

	walk->nbytes = walk->total;
	if (unlikely(!walk->total))
		return 0;

	walk->iv_buffer = NULL;
	walk->iv = req->info;
	if (unlikely(((unsigned long)walk->iv & alignmask))) {
		int err = ablkcipher_copy_iv(walk, tfm, alignmask);
		if (err)
			return err;
	}

	scatterwalk_start(&walk->in, walk->in.sg);
	scatterwalk_start(&walk->out, walk->out.sg);

	return ablkcipher_walk_next(req, walk);
}

int ablkcipher_walk_phys(struct ablkcipher_request *req,
			 struct ablkcipher_walk *walk)
{
	walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm);
	return ablkcipher_walk_first(req, walk);
}
EXPORT_SYMBOL_GPL(ablkcipher_walk_phys);

static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key,
			    unsigned int keylen)
{
	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
	int ret;
	u8 *buffer, *alignbuffer;
	unsigned long absize;

	absize = keylen + alignmask;
	buffer = kmalloc(absize, GFP_ATOMIC);
	if (!buffer)
		return -ENOMEM;

	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	memcpy(alignbuffer, key, keylen);
	ret = cipher->setkey(tfm, alignbuffer, keylen);
	memset(alignbuffer, 0, keylen);
	kfree(buffer);
	return ret;
}

static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
		  unsigned int keylen)
{
	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);

	if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
		crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
		return -EINVAL;
	}

	if ((unsigned long)key & alignmask)
		return setkey_unaligned(tfm, key, keylen);

	return cipher->setkey(tfm, key, keylen);
}

static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
					      u32 mask)
{
	return alg->cra_ctxsize;
}

int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req)
{
	return crypto_ablkcipher_encrypt(&req->creq);
}

int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req)
{
	return crypto_ablkcipher_decrypt(&req->creq);
}

static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
				      u32 mask)
{
	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;

	if (alg->ivsize > PAGE_SIZE / 8)
		return -EINVAL;

	crt->setkey = setkey;
	crt->encrypt = alg->encrypt;
	crt->decrypt = alg->decrypt;
	if (!alg->ivsize) {
		crt->givencrypt = skcipher_null_givencrypt;
		crt->givdecrypt = skcipher_null_givdecrypt;
	}
	crt->base = __crypto_ablkcipher_cast(tfm);
	crt->ivsize = alg->ivsize;

	return 0;
}

static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;

	seq_printf(m, "type         : ablkcipher\n");
	seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
					     "yes" : "no");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "min keysize  : %u\n", ablkcipher->min_keysize);
	seq_printf(m, "max keysize  : %u\n", ablkcipher->max_keysize);
	seq_printf(m, "ivsize       : %u\n", ablkcipher->ivsize);
	seq_printf(m, "geniv        : %s\n", ablkcipher->geniv ?: "<default>");
}

const struct crypto_type crypto_ablkcipher_type = {
	.ctxsize = crypto_ablkcipher_ctxsize,
	.init = crypto_init_ablkcipher_ops,
#ifdef CONFIG_PROC_FS
	.show = crypto_ablkcipher_show,
#endif
};
EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);

static int no_givdecrypt(struct skcipher_givcrypt_request *req)
{
	return -ENOSYS;
}

static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
				      u32 mask)
{
	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;

	if (alg->ivsize > PAGE_SIZE / 8)
		return -EINVAL;

	crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
		      alg->setkey : setkey;
	crt->encrypt = alg->encrypt;
	crt->decrypt = alg->decrypt;
	crt->givencrypt = alg->givencrypt;
	crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
	crt->base = __crypto_ablkcipher_cast(tfm);
	crt->ivsize = alg->ivsize;

	return 0;
}

static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));
static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;

	seq_printf(m, "type         : givcipher\n");
	seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
					     "yes" : "no");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "min keysize  : %u\n", ablkcipher->min_keysize);
	seq_printf(m, "max keysize  : %u\n", ablkcipher->max_keysize);
	seq_printf(m, "ivsize       : %u\n", ablkcipher->ivsize);
	seq_printf(m, "geniv        : %s\n", ablkcipher->geniv ?: "<built-in>");
}

const struct crypto_type crypto_givcipher_type = {
	.ctxsize = crypto_ablkcipher_ctxsize,
	.init = crypto_init_givcipher_ops,
#ifdef CONFIG_PROC_FS
	.show = crypto_givcipher_show,
#endif
};
EXPORT_SYMBOL_GPL(crypto_givcipher_type);

const char *crypto_default_geniv(const struct crypto_alg *alg)
{
	if (((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	     CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
					 alg->cra_ablkcipher.ivsize) !=
	    alg->cra_blocksize)
		return "chainiv";

	return alg->cra_flags & CRYPTO_ALG_ASYNC ?
	       "eseqiv" : skcipher_default_geniv;
}

static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask)
{
	struct rtattr *tb[3];
	struct {
		struct rtattr attr;
		struct crypto_attr_type data;
	} ptype;
	struct {
		struct rtattr attr;
		struct crypto_attr_alg data;
	} palg;
	struct crypto_template *tmpl;
	struct crypto_instance *inst;
	struct crypto_alg *larval;
	const char *geniv;
	int err;

	larval = crypto_larval_lookup(alg->cra_driver_name,
				      (type & ~CRYPTO_ALG_TYPE_MASK) |
				      CRYPTO_ALG_TYPE_GIVCIPHER,
				      mask | CRYPTO_ALG_TYPE_MASK);
	err = PTR_ERR(larval);
	if (IS_ERR(larval))
		goto out;

	err = -EAGAIN;
	if (!crypto_is_larval(larval))
		goto drop_larval;

	ptype.attr.rta_len = sizeof(ptype);
	ptype.attr.rta_type = CRYPTOA_TYPE;
	ptype.data.type = type | CRYPTO_ALG_GENIV;
	/* GENIV tells the template that we're making a default geniv. */
	ptype.data.mask = mask | CRYPTO_ALG_GENIV;
	tb[0] = &ptype.attr;

	palg.attr.rta_len = sizeof(palg);
	palg.attr.rta_type = CRYPTOA_ALG;
	/* Must use the exact name to locate ourselves. */
	memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
	tb[1] = &palg.attr;

	tb[2] = NULL;

	if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	    CRYPTO_ALG_TYPE_BLKCIPHER)
		geniv = alg->cra_blkcipher.geniv;
	else
		geniv = alg->cra_ablkcipher.geniv;

	if (!geniv)
		geniv = crypto_default_geniv(alg);

	tmpl = crypto_lookup_template(geniv);
	err = -ENOENT;
	if (!tmpl)
		goto kill_larval;

	inst = tmpl->alloc(tb);
	err = PTR_ERR(inst);
	if (IS_ERR(inst))
		goto put_tmpl;

	if ((err = crypto_register_instance(tmpl, inst))) {
		tmpl->free(inst);
		goto put_tmpl;
	}

	/* Redo the lookup to use the instance we just registered. */
	err = -EAGAIN;

put_tmpl:
	crypto_tmpl_put(tmpl);
kill_larval:
	crypto_larval_kill(larval);
drop_larval:
	crypto_mod_put(larval);
out:
	crypto_mod_put(alg);
	return err;
}

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

	alg = crypto_alg_mod_lookup(name, type, mask);
	if (IS_ERR(alg))
		return alg;

	if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	    CRYPTO_ALG_TYPE_GIVCIPHER)
		return alg;

	if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	      CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
					  alg->cra_ablkcipher.ivsize))
		return alg;

	crypto_mod_put(alg);
	alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED,
				    mask & ~CRYPTO_ALG_TESTED);
	if (IS_ERR(alg))
		return alg;

	if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	    CRYPTO_ALG_TYPE_GIVCIPHER) {
		if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) {
			crypto_mod_put(alg);
			alg = ERR_PTR(-ENOENT);
		}
		return alg;
	}

	BUG_ON(!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
		 CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
					     alg->cra_ablkcipher.ivsize));

	return ERR_PTR(crypto_givcipher_default(alg, type, mask));
}

int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
			 u32 type, u32 mask)
{
	struct crypto_alg *alg;
	int err;

	type = crypto_skcipher_type(type);
	mask = crypto_skcipher_mask(mask);

	alg = crypto_lookup_skcipher(name, type, mask);
	if (IS_ERR(alg))
		return PTR_ERR(alg);

	err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
	crypto_mod_put(alg);
	return err;
}
EXPORT_SYMBOL_GPL(crypto_grab_skcipher);

struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name,
						  u32 type, u32 mask)
{
	struct crypto_tfm *tfm;
	int err;

	type = crypto_skcipher_type(type);
	mask = crypto_skcipher_mask(mask);

	for (;;) {
		struct crypto_alg *alg;

		alg = crypto_lookup_skcipher(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 __crypto_ablkcipher_cast(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_ablkcipher);

static int __init skcipher_module_init(void)
{
	skcipher_default_geniv = num_possible_cpus() > 1 ?
				 "eseqiv" : "chainiv";
	return 0;
}

static void skcipher_module_exit(void)
{
}

module_init(skcipher_module_init);
module_exit(skcipher_module_exit);
Commit	Line	Data
b5b7f088 HX	1	/*
b5b7f088 HX	2	* Asynchronous block chaining cipher operations.
c4ede64a	3	*
b5b7f088 HX	4	* This is the asynchronous version of blkcipher.c indicating completion
	5	* via a callback.
	6	*
	7	* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the Free
c4ede64a	11	* Software Foundation; either version 2 of the License, or (at your option)
b5b7f088 HX	12	* any later version.
	13	*
	14	*/
	15
378f4f51	16	#include <crypto/internal/skcipher.h>
0b67fb65	17	#include <linux/cpumask.h>
378f4f51	18	#include <linux/err.h>
b5b7f088	19	#include <linux/init.h>
791b4d5f	20	#include <linux/kernel.h>
b5b7f088	21	#include <linux/module.h>
b9c55aa4 HX	22	#include <linux/rtnetlink.h>
b9c55aa4 HX	23	#include <linux/sched.h>
791b4d5f	24	#include <linux/slab.h>
b5b7f088 HX	25	#include <linux/seq_file.h>
b5b7f088 HX	26
bf06099d DM	27	#include <crypto/scatterwalk.h>
bf06099d DM	28
378f4f51 HX	29	#include "internal.h"
378f4f51 HX	30
0b67fb65 HX	31	static const char *skcipher_default_geniv __read_mostly;
0b67fb65 HX	32
bf06099d DM	33	struct ablkcipher_buffer {
	34	struct list_head entry;
	35	struct scatter_walk dst;
	36	unsigned int len;
	37	void *data;
	38	};
	39
	40	enum {
	41	ABLKCIPHER_WALK_SLOW = 1 << 0,
	42	};
	43
	44	static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p)
	45	{
	46	scatterwalk_copychunks(p->data, &p->dst, p->len, 1);
	47	}
	48
	49	void __ablkcipher_walk_complete(struct ablkcipher_walk *walk)
	50	{
	51	struct ablkcipher_buffer p, tmp;
	52
	53	list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {
	54	ablkcipher_buffer_write(p);
	55	list_del(&p->entry);
	56	kfree(p);
	57	}
	58	}
	59	EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete);
	60
	61	static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk,
	62	struct ablkcipher_buffer *p)
	63	{
	64	p->dst = walk->out;
	65	list_add_tail(&p->entry, &walk->buffers);
	66	}
	67
	68	/* Get a spot of the specified length that does not straddle a page.
	69	* The caller needs to ensure that there is enough space for this operation.
	70	*/
	71	static inline u8 ablkcipher_get_spot(u8 start, unsigned int len)
	72	{
	73	u8 end_page = (u8 )(((unsigned long)(start + len - 1)) & PAGE_MASK);
	74	return max(start, end_page);
	75	}
	76
	77	static inline unsigned int ablkcipher_done_slow(struct ablkcipher_walk *walk,
	78	unsigned int bsize)
	79	{
	80	unsigned int n = bsize;
	81
	82	for (;;) {
	83	unsigned int len_this_page = scatterwalk_pagelen(&walk->out);
	84
	85	if (len_this_page > n)
	86	len_this_page = n;
	87	scatterwalk_advance(&walk->out, n);
	88	if (n == len_this_page)
	89	break;
	90	n -= len_this_page;
	91	scatterwalk_start(&walk->out, scatterwalk_sg_next(walk->out.sg));
	92	}
	93
	94	return bsize;
	95	}
	96
97	static inline unsigned int ablkcipher_done_fast(struct ablkcipher_walk *walk,
98	unsigned int n)
99	{
100	scatterwalk_advance(&walk->in, n);
101	scatterwalk_advance(&walk->out, n);
102
103	return n;
104	}
105
106	static int ablkcipher_walk_next(struct ablkcipher_request *req,
107	struct ablkcipher_walk *walk);
108
109	int ablkcipher_walk_done(struct ablkcipher_request *req,
110	struct ablkcipher_walk *walk, int err)
111	{
112	struct crypto_tfm *tfm = req->base.tfm;
113	unsigned int nbytes = 0;
114
115	if (likely(err >= 0)) {
116	unsigned int n = walk->nbytes - err;
117
118	if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW)))
119	n = ablkcipher_done_fast(walk, n);
120	else if (WARN_ON(err)) {
121	err = -EINVAL;
122	goto err;
123	} else
124	n = ablkcipher_done_slow(walk, n);
125
126	nbytes = walk->total - n;
127	err = 0;
128	}
129
130	scatterwalk_done(&walk->in, 0, nbytes);
131	scatterwalk_done(&walk->out, 1, nbytes);
132
133	err:
134	walk->total = nbytes;
135	walk->nbytes = nbytes;
136
137	if (nbytes) {
138	crypto_yield(req->base.flags);
139	return ablkcipher_walk_next(req, walk);
140	}
141
142	if (walk->iv != req->info)
143	memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize);
33c7c0fb	144	kfree(walk->iv_buffer);
bf06099d DM	145
	146	return err;
	147	}
	148	EXPORT_SYMBOL_GPL(ablkcipher_walk_done);
	149
	150	static inline int ablkcipher_next_slow(struct ablkcipher_request *req,
	151	struct ablkcipher_walk *walk,
	152	unsigned int bsize,
	153	unsigned int alignmask,
	154	void src_p, void dst_p)
	155	{
	156	unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
	157	struct ablkcipher_buffer *p;
	158	void src, dst, *base;
	159	unsigned int n;
	160
	161	n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1);
	162	n += (aligned_bsize * 3 - (alignmask + 1) +
	163	(alignmask & ~(crypto_tfm_ctx_alignment() - 1)));
	164
	165	p = kmalloc(n, GFP_ATOMIC);
	166	if (!p)
2716fbf6	167	return ablkcipher_walk_done(req, walk, -ENOMEM);
bf06099d DM	168
	169	base = p + 1;
	170
	171	dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1);
	172	src = dst = ablkcipher_get_spot(dst, bsize);
	173
	174	p->len = bsize;
	175	p->data = dst;
	176
	177	scatterwalk_copychunks(src, &walk->in, bsize, 0);
	178
	179	ablkcipher_queue_write(walk, p);
	180
	181	walk->nbytes = bsize;
	182	walk->flags \|= ABLKCIPHER_WALK_SLOW;
	183
	184	*src_p = src;
	185	*dst_p = dst;
	186
	187	return 0;
	188	}
	189
	190	static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk,
	191	struct crypto_tfm *tfm,
	192	unsigned int alignmask)
	193	{
	194	unsigned bs = walk->blocksize;
	195	unsigned int ivsize = tfm->crt_ablkcipher.ivsize;
	196	unsigned aligned_bs = ALIGN(bs, alignmask + 1);
	197	unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
	198	(alignmask + 1);
	199	u8 *iv;
	200
	201	size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
	202	walk->iv_buffer = kmalloc(size, GFP_ATOMIC);
	203	if (!walk->iv_buffer)
	204	return -ENOMEM;
	205
	206	iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1);
	207	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
	208	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
	209	iv = ablkcipher_get_spot(iv, ivsize);
	210
	211	walk->iv = memcpy(iv, walk->iv, ivsize);
	212	return 0;
	213	}
	214
	215	static inline int ablkcipher_next_fast(struct ablkcipher_request *req,
	216	struct ablkcipher_walk *walk)
	217	{
	218	walk->src.page = scatterwalk_page(&walk->in);
	219	walk->src.offset = offset_in_page(walk->in.offset);
	220	walk->dst.page = scatterwalk_page(&walk->out);
	221	walk->dst.offset = offset_in_page(walk->out.offset);
	222
	223	return 0;
	224	}
	225
	226	static int ablkcipher_walk_next(struct ablkcipher_request *req,
	227	struct ablkcipher_walk *walk)
	228	{
	229	struct crypto_tfm *tfm = req->base.tfm;
	230	unsigned int alignmask, bsize, n;
	231	void src, dst;
232	int err;
233
234	alignmask = crypto_tfm_alg_alignmask(tfm);
235	n = walk->total;
236	if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) {
237	req->base.flags \|= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
238	return ablkcipher_walk_done(req, walk, -EINVAL);
239	}
240
241	walk->flags &= ~ABLKCIPHER_WALK_SLOW;
242	src = dst = NULL;
243
244	bsize = min(walk->blocksize, n);
245	n = scatterwalk_clamp(&walk->in, n);
246	n = scatterwalk_clamp(&walk->out, n);
247
248	if (n < bsize \|\|
249	!scatterwalk_aligned(&walk->in, alignmask) \|\|
250	!scatterwalk_aligned(&walk->out, alignmask)) {
251	err = ablkcipher_next_slow(req, walk, bsize, alignmask,
252	&src, &dst);
253	goto set_phys_lowmem;
254	}
255
256	walk->nbytes = n;
257
258	return ablkcipher_next_fast(req, walk);
259
260	set_phys_lowmem:
261	if (err >= 0) {
262	walk->src.page = virt_to_page(src);
263	walk->dst.page = virt_to_page(dst);
264	walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1));
265	walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1));
266	}
267
268	return err;
269	}
270
271	static int ablkcipher_walk_first(struct ablkcipher_request *req,
272	struct ablkcipher_walk *walk)
273	{
274	struct crypto_tfm *tfm = req->base.tfm;
275	unsigned int alignmask;
276
277	alignmask = crypto_tfm_alg_alignmask(tfm);
278	if (WARN_ON_ONCE(in_irq()))
279	return -EDEADLK;
280
281	walk->nbytes = walk->total;
282	if (unlikely(!walk->total))
283	return 0;
284
285	walk->iv_buffer = NULL;
286	walk->iv = req->info;
287	if (unlikely(((unsigned long)walk->iv & alignmask))) {
288	int err = ablkcipher_copy_iv(walk, tfm, alignmask);
289	if (err)
290	return err;
291	}
292
293	scatterwalk_start(&walk->in, walk->in.sg);
294	scatterwalk_start(&walk->out, walk->out.sg);
295
296	return ablkcipher_walk_next(req, walk);
297	}
298
299	int ablkcipher_walk_phys(struct ablkcipher_request *req,
300	struct ablkcipher_walk *walk)
301	{
302	walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm);
303	return ablkcipher_walk_first(req, walk);
304	}
305	EXPORT_SYMBOL_GPL(ablkcipher_walk_phys);
306
791b4d5f HX	307	static int setkey_unaligned(struct crypto_ablkcipher tfm, const u8 key,
791b4d5f HX	308	unsigned int keylen)
ca7c3938 SS	309	{
	310	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	311	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
	312	int ret;
	313	u8 buffer, alignbuffer;
	314	unsigned long absize;
	315
	316	absize = keylen + alignmask;
	317	buffer = kmalloc(absize, GFP_ATOMIC);
	318	if (!buffer)
	319	return -ENOMEM;
	320
	321	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	322	memcpy(alignbuffer, key, keylen);
	323	ret = cipher->setkey(tfm, alignbuffer, keylen);
06817176	324	memset(alignbuffer, 0, keylen);
ca7c3938 SS	325	kfree(buffer);
	326	return ret;
	327	}
	328
b5b7f088 HX	329	static int setkey(struct crypto_ablkcipher tfm, const u8 key,
	330	unsigned int keylen)
	331	{
	332	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
ca7c3938	333	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
b5b7f088 HX	334
	335	if (keylen < cipher->min_keysize \|\| keylen > cipher->max_keysize) {
	336	crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	337	return -EINVAL;
	338	}
	339
ca7c3938 SS	340	if ((unsigned long)key & alignmask)
	341	return setkey_unaligned(tfm, key, keylen);
	342
b5b7f088 HX	343	return cipher->setkey(tfm, key, keylen);
	344	}
	345
	346	static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
	347	u32 mask)
	348	{
	349	return alg->cra_ctxsize;
	350	}
	351
b9c55aa4 HX	352	int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req)
	353	{
	354	return crypto_ablkcipher_encrypt(&req->creq);
	355	}
	356
	357	int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req)
	358	{
	359	return crypto_ablkcipher_decrypt(&req->creq);
	360	}
	361
b5b7f088 HX	362	static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
	363	u32 mask)
	364	{
	365	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	366	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	367
	368	if (alg->ivsize > PAGE_SIZE / 8)
	369	return -EINVAL;
	370
	371	crt->setkey = setkey;
	372	crt->encrypt = alg->encrypt;
	373	crt->decrypt = alg->decrypt;
b9c55aa4 HX	374	if (!alg->ivsize) {
	375	crt->givencrypt = skcipher_null_givencrypt;
	376	crt->givdecrypt = skcipher_null_givdecrypt;
	377	}
ecfc4329	378	crt->base = __crypto_ablkcipher_cast(tfm);
b5b7f088 HX	379	crt->ivsize = alg->ivsize;
	380
	381	return 0;
	382	}
	383
	384	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	385	__attribute__ ((unused));
	386	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	387	{
	388	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
	389
	390	seq_printf(m, "type : ablkcipher\n");
189ed66e HX	391	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
189ed66e HX	392	"yes" : "no");
b5b7f088 HX	393	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	394	seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
	395	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	396	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
23508e11	397	seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>");
b5b7f088 HX	398	}
	399
	400	const struct crypto_type crypto_ablkcipher_type = {
	401	.ctxsize = crypto_ablkcipher_ctxsize,
	402	.init = crypto_init_ablkcipher_ops,
	403	#ifdef CONFIG_PROC_FS
	404	.show = crypto_ablkcipher_show,
	405	#endif
	406	};
	407	EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
	408
61da88e2 HX	409	static int no_givdecrypt(struct skcipher_givcrypt_request *req)
	410	{
	411	return -ENOSYS;
	412	}
	413
	414	static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
	415	u32 mask)
	416	{
	417	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	418	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	419
	420	if (alg->ivsize > PAGE_SIZE / 8)
	421	return -EINVAL;
	422
ecfc4329 HX	423	crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
ecfc4329 HX	424	alg->setkey : setkey;
61da88e2 HX	425	crt->encrypt = alg->encrypt;
	426	crt->decrypt = alg->decrypt;
	427	crt->givencrypt = alg->givencrypt;
	428	crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
ecfc4329	429	crt->base = __crypto_ablkcipher_cast(tfm);
61da88e2 HX	430	crt->ivsize = alg->ivsize;
	431
	432	return 0;
	433	}
	434
	435	static void crypto_givcipher_show(struct seq_file m, struct crypto_alg alg)
	436	__attribute__ ((unused));
	437	static void crypto_givcipher_show(struct seq_file m, struct crypto_alg alg)
	438	{
	439	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
	440
	441	seq_printf(m, "type : givcipher\n");
189ed66e HX	442	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
189ed66e HX	443	"yes" : "no");
61da88e2 HX	444	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	445	seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
	446	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	447	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
23508e11	448	seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>");
61da88e2 HX	449	}
	450
	451	const struct crypto_type crypto_givcipher_type = {
	452	.ctxsize = crypto_ablkcipher_ctxsize,
	453	.init = crypto_init_givcipher_ops,
	454	#ifdef CONFIG_PROC_FS
	455	.show = crypto_givcipher_show,
	456	#endif
	457	};
	458	EXPORT_SYMBOL_GPL(crypto_givcipher_type);
	459
ecfc4329 HX	460	const char crypto_default_geniv(const struct crypto_alg alg)
ecfc4329 HX	461	{
63b5ac28 HX	462	if (((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	463	CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
	464	alg->cra_ablkcipher.ivsize) !=
	465	alg->cra_blocksize)
	466	return "chainiv";
	467
0b67fb65 HX	468	return alg->cra_flags & CRYPTO_ALG_ASYNC ?
0b67fb65 HX	469	"eseqiv" : skcipher_default_geniv;
ecfc4329 HX	470	}
ecfc4329 HX	471
b9c55aa4 HX	472	static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask)
	473	{
	474	struct rtattr *tb[3];
	475	struct {
	476	struct rtattr attr;
	477	struct crypto_attr_type data;
	478	} ptype;
	479	struct {
	480	struct rtattr attr;
	481	struct crypto_attr_alg data;
	482	} palg;
	483	struct crypto_template *tmpl;
	484	struct crypto_instance *inst;
	485	struct crypto_alg *larval;
	486	const char *geniv;
	487	int err;
	488
	489	larval = crypto_larval_lookup(alg->cra_driver_name,
435578ae	490	(type & ~CRYPTO_ALG_TYPE_MASK) \|
b9c55aa4	491	CRYPTO_ALG_TYPE_GIVCIPHER,
435578ae	492	mask \| CRYPTO_ALG_TYPE_MASK);
b9c55aa4 HX	493	err = PTR_ERR(larval);
	494	if (IS_ERR(larval))
	495	goto out;
	496
	497	err = -EAGAIN;
	498	if (!crypto_is_larval(larval))
	499	goto drop_larval;
	500
	501	ptype.attr.rta_len = sizeof(ptype);
	502	ptype.attr.rta_type = CRYPTOA_TYPE;
	503	ptype.data.type = type \| CRYPTO_ALG_GENIV;
	504	/* GENIV tells the template that we're making a default geniv. */
	505	ptype.data.mask = mask \| CRYPTO_ALG_GENIV;
	506	tb[0] = &ptype.attr;
	507
	508	palg.attr.rta_len = sizeof(palg);
	509	palg.attr.rta_type = CRYPTOA_ALG;
	510	/* Must use the exact name to locate ourselves. */
	511	memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
	512	tb[1] = &palg.attr;
	513
	514	tb[2] = NULL;
	515
	516	if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	517	CRYPTO_ALG_TYPE_BLKCIPHER)
	518	geniv = alg->cra_blkcipher.geniv;
	519	else
	520	geniv = alg->cra_ablkcipher.geniv;
	521
	522	if (!geniv)
	523	geniv = crypto_default_geniv(alg);
	524
	525	tmpl = crypto_lookup_template(geniv);
	526	err = -ENOENT;
	527	if (!tmpl)
	528	goto kill_larval;
	529
	530	inst = tmpl->alloc(tb);
	531	err = PTR_ERR(inst);
	532	if (IS_ERR(inst))
	533	goto put_tmpl;
	534
	535	if ((err = crypto_register_instance(tmpl, inst))) {
	536	tmpl->free(inst);
	537	goto put_tmpl;
	538	}
	539
	540	/* Redo the lookup to use the instance we just registered. */
	541	err = -EAGAIN;
	542
	543	put_tmpl:
	544	crypto_tmpl_put(tmpl);
	545	kill_larval:
	546	crypto_larval_kill(larval);
	547	drop_larval:
	548	crypto_mod_put(larval);
	549	out:
	550	crypto_mod_put(alg);
	551	return err;
	552	}
	553
	554	static struct crypto_alg crypto_lookup_skcipher(const char name, u32 type,
	555	u32 mask)
	556	{
557	struct crypto_alg *alg;
558
559	alg = crypto_alg_mod_lookup(name, type, mask);
560	if (IS_ERR(alg))
561	return alg;
562
563	if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
564	CRYPTO_ALG_TYPE_GIVCIPHER)
565	return alg;
566
567	if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
568	CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
569	alg->cra_ablkcipher.ivsize))
570	return alg;
571
b170a137 HX	572	crypto_mod_put(alg);
	573	alg = crypto_alg_mod_lookup(name, type \| CRYPTO_ALG_TESTED,
	574	mask & ~CRYPTO_ALG_TESTED);
	575	if (IS_ERR(alg))
	576	return alg;
	577
	578	if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	579	CRYPTO_ALG_TYPE_GIVCIPHER) {
	580	if ((alg->cra_flags ^ type ^ ~mask) & CRYPTO_ALG_TESTED) {
	581	crypto_mod_put(alg);
	582	alg = ERR_PTR(-ENOENT);
	583	}
	584	return alg;
	585	}
	586
	587	BUG_ON(!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
	588	CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
	589	alg->cra_ablkcipher.ivsize));
	590
b9c55aa4 HX	591	return ERR_PTR(crypto_givcipher_default(alg, type, mask));
	592	}
	593
378f4f51 HX	594	int crypto_grab_skcipher(struct crypto_skcipher_spawn spawn, const char name,
	595	u32 type, u32 mask)
	596	{
	597	struct crypto_alg *alg;
	598	int err;
	599
	600	type = crypto_skcipher_type(type);
	601	mask = crypto_skcipher_mask(mask);
	602
b9c55aa4	603	alg = crypto_lookup_skcipher(name, type, mask);
378f4f51 HX	604	if (IS_ERR(alg))
	605	return PTR_ERR(alg);
	606
	607	err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
	608	crypto_mod_put(alg);
	609	return err;
	610	}
	611	EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
	612
b9c55aa4 HX	613	struct crypto_ablkcipher crypto_alloc_ablkcipher(const char alg_name,
	614	u32 type, u32 mask)
	615	{
	616	struct crypto_tfm *tfm;
	617	int err;
	618
	619	type = crypto_skcipher_type(type);
	620	mask = crypto_skcipher_mask(mask);
	621
	622	for (;;) {
	623	struct crypto_alg *alg;
	624
	625	alg = crypto_lookup_skcipher(alg_name, type, mask);
	626	if (IS_ERR(alg)) {
	627	err = PTR_ERR(alg);
	628	goto err;
	629	}
	630
	631	tfm = __crypto_alloc_tfm(alg, type, mask);
	632	if (!IS_ERR(tfm))
	633	return __crypto_ablkcipher_cast(tfm);
	634
	635	crypto_mod_put(alg);
	636	err = PTR_ERR(tfm);
	637
	638	err:
	639	if (err != -EAGAIN)
	640	break;
	641	if (signal_pending(current)) {
	642	err = -EINTR;
	643	break;
	644	}
	645	}
	646
	647	return ERR_PTR(err);
	648	}
	649	EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher);
0b67fb65 HX	650
	651	static int __init skcipher_module_init(void)
	652	{
	653	skcipher_default_geniv = num_possible_cpus() > 1 ?
	654	"eseqiv" : "chainiv";
	655	return 0;
	656	}
	657
	658	static void skcipher_module_exit(void)
	659	{
	660	}
	661
	662	module_init(skcipher_module_init);
	663	module_exit(skcipher_module_exit);