[mirror_ubuntu-artful-kernel.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/err.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/cryptouser.h>
#include <net/netlink.h>

#include <crypto/scatterwalk.h>

#include "internal.h"

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, 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->iv = req->info;
	walk->nbytes = walk->total;
	if (unlikely(!walk->total))
		return 0;

	walk->iv_buffer = NULL;
	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;
}

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;
	crt->base = __crypto_ablkcipher_cast(tfm);
	crt->ivsize = alg->ivsize;

	return 0;
}

#ifdef CONFIG_NET
static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_blkcipher rblkcipher;

	strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));
	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",
		sizeof(rblkcipher.geniv));

	rblkcipher.blocksize = alg->cra_blocksize;
	rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
	rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
	rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;

	if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
		    sizeof(struct crypto_report_blkcipher), &rblkcipher))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}
#else
static int crypto_ablkcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	return -ENOSYS;
}
#endif

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
	.report = crypto_ablkcipher_report,
};
EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);

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->base = __crypto_ablkcipher_cast(tfm);
	crt->ivsize = alg->ivsize;

	return 0;
}

#ifdef CONFIG_NET
static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_blkcipher rblkcipher;

	strncpy(rblkcipher.type, "givcipher", sizeof(rblkcipher.type));
	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<built-in>",
		sizeof(rblkcipher.geniv));

	rblkcipher.blocksize = alg->cra_blocksize;
	rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
	rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
	rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;

	if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
		    sizeof(struct crypto_report_blkcipher), &rblkcipher))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}
#else
static int crypto_givcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	return -ENOSYS;
}
#endif

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
	.report = crypto_givcipher_report,
};
EXPORT_SYMBOL_GPL(crypto_givcipher_type);
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 HX	16	#include <crypto/internal/skcipher.h>
378f4f51 HX	17	#include <linux/err.h>
791b4d5f	18	#include <linux/kernel.h>
791b4d5f	19	#include <linux/slab.h>
b5b7f088	20	#include <linux/seq_file.h>
29ffc876 SK	21	#include <linux/cryptouser.h>
29ffc876 SK	22	#include <net/netlink.h>
b5b7f088	23
bf06099d DM	24	#include <crypto/scatterwalk.h>
bf06099d DM	25
378f4f51 HX	26	#include "internal.h"
378f4f51 HX	27
bf06099d DM	28	struct ablkcipher_buffer {
	29	struct list_head entry;
	30	struct scatter_walk dst;
	31	unsigned int len;
	32	void *data;
	33	};
	34
	35	enum {
	36	ABLKCIPHER_WALK_SLOW = 1 << 0,
	37	};
	38
	39	static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p)
	40	{
	41	scatterwalk_copychunks(p->data, &p->dst, p->len, 1);
	42	}
	43
	44	void __ablkcipher_walk_complete(struct ablkcipher_walk *walk)
	45	{
	46	struct ablkcipher_buffer p, tmp;
	47
	48	list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {
	49	ablkcipher_buffer_write(p);
	50	list_del(&p->entry);
	51	kfree(p);
	52	}
	53	}
	54	EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete);
	55
	56	static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk,
	57	struct ablkcipher_buffer *p)
	58	{
	59	p->dst = walk->out;
	60	list_add_tail(&p->entry, &walk->buffers);
	61	}
	62
	63	/* Get a spot of the specified length that does not straddle a page.
	64	* The caller needs to ensure that there is enough space for this operation.
	65	*/
	66	static inline u8 ablkcipher_get_spot(u8 start, unsigned int len)
	67	{
	68	u8 end_page = (u8 )(((unsigned long)(start + len - 1)) & PAGE_MASK);
a861afbc	69
bf06099d DM	70	return max(start, end_page);
	71	}
	72
	73	static inline unsigned int ablkcipher_done_slow(struct ablkcipher_walk *walk,
	74	unsigned int bsize)
	75	{
	76	unsigned int n = bsize;
	77
	78	for (;;) {
	79	unsigned int len_this_page = scatterwalk_pagelen(&walk->out);
	80
	81	if (len_this_page > n)
	82	len_this_page = n;
	83	scatterwalk_advance(&walk->out, n);
	84	if (n == len_this_page)
	85	break;
	86	n -= len_this_page;
5be4d4c9	87	scatterwalk_start(&walk->out, sg_next(walk->out.sg));
bf06099d DM	88	}
	89
	90	return bsize;
	91	}
	92
	93	static inline unsigned int ablkcipher_done_fast(struct ablkcipher_walk *walk,
	94	unsigned int n)
	95	{
	96	scatterwalk_advance(&walk->in, n);
	97	scatterwalk_advance(&walk->out, n);
	98
	99	return n;
	100	}
	101
	102	static int ablkcipher_walk_next(struct ablkcipher_request *req,
	103	struct ablkcipher_walk *walk);
	104
	105	int ablkcipher_walk_done(struct ablkcipher_request *req,
	106	struct ablkcipher_walk *walk, int err)
	107	{
	108	struct crypto_tfm *tfm = req->base.tfm;
	109	unsigned int nbytes = 0;
	110
	111	if (likely(err >= 0)) {
	112	unsigned int n = walk->nbytes - err;
	113
	114	if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW)))
	115	n = ablkcipher_done_fast(walk, n);
	116	else if (WARN_ON(err)) {
	117	err = -EINVAL;
	118	goto err;
	119	} else
	120	n = ablkcipher_done_slow(walk, n);
	121
	122	nbytes = walk->total - n;
	123	err = 0;
	124	}
	125
	126	scatterwalk_done(&walk->in, 0, nbytes);
	127	scatterwalk_done(&walk->out, 1, nbytes);
	128
	129	err:
	130	walk->total = nbytes;
	131	walk->nbytes = nbytes;
	132
	133	if (nbytes) {
	134	crypto_yield(req->base.flags);
	135	return ablkcipher_walk_next(req, walk);
	136	}
	137
	138	if (walk->iv != req->info)
	139	memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize);
33c7c0fb	140	kfree(walk->iv_buffer);
bf06099d DM	141
	142	return err;
	143	}
	144	EXPORT_SYMBOL_GPL(ablkcipher_walk_done);
	145
	146	static inline int ablkcipher_next_slow(struct ablkcipher_request *req,
	147	struct ablkcipher_walk *walk,
	148	unsigned int bsize,
	149	unsigned int alignmask,
	150	void src_p, void dst_p)
	151	{
	152	unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
	153	struct ablkcipher_buffer *p;
	154	void src, dst, *base;
	155	unsigned int n;
	156
	157	n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1);
	158	n += (aligned_bsize * 3 - (alignmask + 1) +
	159	(alignmask & ~(crypto_tfm_ctx_alignment() - 1)));
	160
	161	p = kmalloc(n, GFP_ATOMIC);
	162	if (!p)
2716fbf6	163	return ablkcipher_walk_done(req, walk, -ENOMEM);
bf06099d DM	164
	165	base = p + 1;
	166
	167	dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1);
	168	src = dst = ablkcipher_get_spot(dst, bsize);
	169
	170	p->len = bsize;
	171	p->data = dst;
	172
	173	scatterwalk_copychunks(src, &walk->in, bsize, 0);
	174
	175	ablkcipher_queue_write(walk, p);
	176
	177	walk->nbytes = bsize;
	178	walk->flags \|= ABLKCIPHER_WALK_SLOW;
	179
	180	*src_p = src;
	181	*dst_p = dst;
	182
	183	return 0;
	184	}
	185
	186	static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk,
	187	struct crypto_tfm *tfm,
	188	unsigned int alignmask)
	189	{
	190	unsigned bs = walk->blocksize;
	191	unsigned int ivsize = tfm->crt_ablkcipher.ivsize;
	192	unsigned aligned_bs = ALIGN(bs, alignmask + 1);
	193	unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
	194	(alignmask + 1);
	195	u8 *iv;
	196
	197	size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
	198	walk->iv_buffer = kmalloc(size, GFP_ATOMIC);
	199	if (!walk->iv_buffer)
	200	return -ENOMEM;
	201
	202	iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1);
	203	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
	204	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
	205	iv = ablkcipher_get_spot(iv, ivsize);
	206
	207	walk->iv = memcpy(iv, walk->iv, ivsize);
	208	return 0;
	209	}
	210
	211	static inline int ablkcipher_next_fast(struct ablkcipher_request *req,
	212	struct ablkcipher_walk *walk)
	213	{
	214	walk->src.page = scatterwalk_page(&walk->in);
	215	walk->src.offset = offset_in_page(walk->in.offset);
	216	walk->dst.page = scatterwalk_page(&walk->out);
	217	walk->dst.offset = offset_in_page(walk->out.offset);
	218
	219	return 0;
	220	}
	221
	222	static int ablkcipher_walk_next(struct ablkcipher_request *req,
	223	struct ablkcipher_walk *walk)
	224	{
	225	struct crypto_tfm *tfm = req->base.tfm;
	226	unsigned int alignmask, bsize, n;
	227	void src, dst;
228	int err;
229
230	alignmask = crypto_tfm_alg_alignmask(tfm);
231	n = walk->total;
232	if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) {
233	req->base.flags \|= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
234	return ablkcipher_walk_done(req, walk, -EINVAL);
235	}
236
237	walk->flags &= ~ABLKCIPHER_WALK_SLOW;
238	src = dst = NULL;
239
240	bsize = min(walk->blocksize, n);
241	n = scatterwalk_clamp(&walk->in, n);
242	n = scatterwalk_clamp(&walk->out, n);
243
244	if (n < bsize \|\|
245	!scatterwalk_aligned(&walk->in, alignmask) \|\|
246	!scatterwalk_aligned(&walk->out, alignmask)) {
247	err = ablkcipher_next_slow(req, walk, bsize, alignmask,
248	&src, &dst);
249	goto set_phys_lowmem;
250	}
251
252	walk->nbytes = n;
253
254	return ablkcipher_next_fast(req, walk);
255
256	set_phys_lowmem:
257	if (err >= 0) {
258	walk->src.page = virt_to_page(src);
259	walk->dst.page = virt_to_page(dst);
260	walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1));
261	walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1));
262	}
263
264	return err;
265	}
266
267	static int ablkcipher_walk_first(struct ablkcipher_request *req,
268	struct ablkcipher_walk *walk)
269	{
270	struct crypto_tfm *tfm = req->base.tfm;
271	unsigned int alignmask;
272
273	alignmask = crypto_tfm_alg_alignmask(tfm);
274	if (WARN_ON_ONCE(in_irq()))
275	return -EDEADLK;
276
70d906bc	277	walk->iv = req->info;
bf06099d DM	278	walk->nbytes = walk->total;
	279	if (unlikely(!walk->total))
	280	return 0;
	281
	282	walk->iv_buffer = NULL;
bf06099d DM	283	if (unlikely(((unsigned long)walk->iv & alignmask))) {
bf06099d DM	284	int err = ablkcipher_copy_iv(walk, tfm, alignmask);
a861afbc	285
bf06099d DM	286	if (err)
	287	return err;
	288	}
	289
	290	scatterwalk_start(&walk->in, walk->in.sg);
	291	scatterwalk_start(&walk->out, walk->out.sg);
	292
	293	return ablkcipher_walk_next(req, walk);
	294	}
	295
	296	int ablkcipher_walk_phys(struct ablkcipher_request *req,
	297	struct ablkcipher_walk *walk)
	298	{
	299	walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm);
	300	return ablkcipher_walk_first(req, walk);
	301	}
	302	EXPORT_SYMBOL_GPL(ablkcipher_walk_phys);
	303
791b4d5f HX	304	static int setkey_unaligned(struct crypto_ablkcipher tfm, const u8 key,
791b4d5f HX	305	unsigned int keylen)
ca7c3938 SS	306	{
	307	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	308	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
	309	int ret;
	310	u8 buffer, alignbuffer;
	311	unsigned long absize;
	312
	313	absize = keylen + alignmask;
	314	buffer = kmalloc(absize, GFP_ATOMIC);
	315	if (!buffer)
	316	return -ENOMEM;
	317
	318	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	319	memcpy(alignbuffer, key, keylen);
	320	ret = cipher->setkey(tfm, alignbuffer, keylen);
06817176	321	memset(alignbuffer, 0, keylen);
ca7c3938 SS	322	kfree(buffer);
	323	return ret;
	324	}
	325
b5b7f088 HX	326	static int setkey(struct crypto_ablkcipher tfm, const u8 key,
	327	unsigned int keylen)
	328	{
	329	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
ca7c3938	330	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
b5b7f088 HX	331
	332	if (keylen < cipher->min_keysize \|\| keylen > cipher->max_keysize) {
	333	crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	334	return -EINVAL;
	335	}
	336
ca7c3938 SS	337	if ((unsigned long)key & alignmask)
	338	return setkey_unaligned(tfm, key, keylen);
	339
b5b7f088 HX	340	return cipher->setkey(tfm, key, keylen);
	341	}
	342
	343	static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
	344	u32 mask)
	345	{
	346	return alg->cra_ctxsize;
	347	}
	348
	349	static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
	350	u32 mask)
	351	{
	352	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	353	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	354
	355	if (alg->ivsize > PAGE_SIZE / 8)
	356	return -EINVAL;
	357
	358	crt->setkey = setkey;
	359	crt->encrypt = alg->encrypt;
	360	crt->decrypt = alg->decrypt;
ecfc4329	361	crt->base = __crypto_ablkcipher_cast(tfm);
b5b7f088 HX	362	crt->ivsize = alg->ivsize;
	363
	364	return 0;
	365	}
	366
3acc8473	367	#ifdef CONFIG_NET
29ffc876 SK	368	static int crypto_ablkcipher_report(struct sk_buff skb, struct crypto_alg alg)
	369	{
	370	struct crypto_report_blkcipher rblkcipher;
	371
9a5467bf MK	372	strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));
	373	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",
	374	sizeof(rblkcipher.geniv));
29ffc876 SK	375
	376	rblkcipher.blocksize = alg->cra_blocksize;
	377	rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
	378	rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
	379	rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
	380
6662df33 DM	381	if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
	382	sizeof(struct crypto_report_blkcipher), &rblkcipher))
	383	goto nla_put_failure;
29ffc876 SK	384	return 0;
	385
	386	nla_put_failure:
	387	return -EMSGSIZE;
	388	}
3acc8473 HX	389	#else
	390	static int crypto_ablkcipher_report(struct sk_buff skb, struct crypto_alg alg)
	391	{
	392	return -ENOSYS;
	393	}
	394	#endif
29ffc876	395
b5b7f088 HX	396	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	397	__attribute__ ((unused));
	398	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	399	{
	400	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
	401
	402	seq_printf(m, "type : ablkcipher\n");
189ed66e HX	403	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
189ed66e HX	404	"yes" : "no");
b5b7f088 HX	405	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	406	seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
	407	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	408	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
23508e11	409	seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>");
b5b7f088 HX	410	}
	411
	412	const struct crypto_type crypto_ablkcipher_type = {
	413	.ctxsize = crypto_ablkcipher_ctxsize,
	414	.init = crypto_init_ablkcipher_ops,
	415	#ifdef CONFIG_PROC_FS
	416	.show = crypto_ablkcipher_show,
	417	#endif
29ffc876	418	.report = crypto_ablkcipher_report,
b5b7f088 HX	419	};
	420	EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
	421
61da88e2 HX	422	static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
	423	u32 mask)
	424	{
	425	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	426	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	427
	428	if (alg->ivsize > PAGE_SIZE / 8)
	429	return -EINVAL;
	430
ecfc4329 HX	431	crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
ecfc4329 HX	432	alg->setkey : setkey;
61da88e2 HX	433	crt->encrypt = alg->encrypt;
61da88e2 HX	434	crt->decrypt = alg->decrypt;
ecfc4329	435	crt->base = __crypto_ablkcipher_cast(tfm);
61da88e2 HX	436	crt->ivsize = alg->ivsize;
	437
	438	return 0;
	439	}
	440
3acc8473	441	#ifdef CONFIG_NET
3e29c109 SK	442	static int crypto_givcipher_report(struct sk_buff skb, struct crypto_alg alg)
	443	{
	444	struct crypto_report_blkcipher rblkcipher;
	445
9a5467bf MK	446	strncpy(rblkcipher.type, "givcipher", sizeof(rblkcipher.type));
	447	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<built-in>",
	448	sizeof(rblkcipher.geniv));
3e29c109 SK	449
	450	rblkcipher.blocksize = alg->cra_blocksize;
	451	rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
	452	rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
	453	rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
	454
6662df33 DM	455	if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
	456	sizeof(struct crypto_report_blkcipher), &rblkcipher))
	457	goto nla_put_failure;
3e29c109 SK	458	return 0;
	459
	460	nla_put_failure:
	461	return -EMSGSIZE;
	462	}
3acc8473 HX	463	#else
	464	static int crypto_givcipher_report(struct sk_buff skb, struct crypto_alg alg)
	465	{
	466	return -ENOSYS;
	467	}
	468	#endif
3e29c109	469
61da88e2 HX	470	static void crypto_givcipher_show(struct seq_file m, struct crypto_alg alg)
	471	__attribute__ ((unused));
	472	static void crypto_givcipher_show(struct seq_file m, struct crypto_alg alg)
	473	{
	474	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
	475
	476	seq_printf(m, "type : givcipher\n");
189ed66e HX	477	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
189ed66e HX	478	"yes" : "no");
61da88e2 HX	479	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	480	seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
	481	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	482	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
23508e11	483	seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>");
61da88e2 HX	484	}
	485
	486	const struct crypto_type crypto_givcipher_type = {
	487	.ctxsize = crypto_ablkcipher_ctxsize,
	488	.init = crypto_init_givcipher_ops,
	489	#ifdef CONFIG_PROC_FS
	490	.show = crypto_givcipher_show,
	491	#endif
3e29c109	492	.report = crypto_givcipher_report,
61da88e2 HX	493	};
61da88e2 HX	494	EXPORT_SYMBOL_GPL(crypto_givcipher_type);