[mirror_ubuntu-focal-kernel.git] / crypto / ablkcipher.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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>
 */

#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 <linux/compiler.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 void ablkcipher_done_slow(struct ablkcipher_walk *walk,
					unsigned int n)
{
	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));
	}
}

static inline void ablkcipher_done_fast(struct ablkcipher_walk *walk,
					unsigned int n)
{
	scatterwalk_advance(&walk->in, n);
	scatterwalk_advance(&walk->out, 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 n; /* bytes processed */
	bool more;

	if (unlikely(err < 0))
		goto finish;

	n = walk->nbytes - err;
	walk->total -= n;
	more = (walk->total != 0);

	if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW))) {
		ablkcipher_done_fast(walk, n);
	} else {
		if (WARN_ON(err)) {
			/* unexpected case; didn't process all bytes */
			err = -EINVAL;
			goto finish;
		}
		ablkcipher_done_slow(walk, n);
	}

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

	if (more) {
		crypto_yield(req->base.flags);
		return ablkcipher_walk_next(req, walk);
	}
	err = 0;
finish:
	walk->nbytes = 0;
	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;

	memset(&rblkcipher, 0, sizeof(rblkcipher));

	strscpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));
	strscpy(rblkcipher.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;

	return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
		       sizeof(rblkcipher), &rblkcipher);
}
#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)
	__maybe_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        : <default>\n");
}

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);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
b5b7f088 HX	2	/*
b5b7f088 HX	3	* Asynchronous block chaining cipher operations.
c4ede64a	4	*
b5b7f088 HX	5	* This is the asynchronous version of blkcipher.c indicating completion
	6	* via a callback.
	7	*
	8	* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
b5b7f088 HX	9	*/
b5b7f088 HX	10
378f4f51 HX	11	#include <crypto/internal/skcipher.h>
378f4f51 HX	12	#include <linux/err.h>
791b4d5f	13	#include <linux/kernel.h>
791b4d5f	14	#include <linux/slab.h>
b5b7f088	15	#include <linux/seq_file.h>
29ffc876	16	#include <linux/cryptouser.h>
d8c34b94	17	#include <linux/compiler.h>
29ffc876	18	#include <net/netlink.h>
b5b7f088	19
bf06099d DM	20	#include <crypto/scatterwalk.h>
bf06099d DM	21
378f4f51 HX	22	#include "internal.h"
378f4f51 HX	23
bf06099d DM	24	struct ablkcipher_buffer {
	25	struct list_head entry;
	26	struct scatter_walk dst;
	27	unsigned int len;
	28	void *data;
	29	};
	30
	31	enum {
	32	ABLKCIPHER_WALK_SLOW = 1 << 0,
	33	};
	34
	35	static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p)
	36	{
	37	scatterwalk_copychunks(p->data, &p->dst, p->len, 1);
	38	}
	39
	40	void __ablkcipher_walk_complete(struct ablkcipher_walk *walk)
	41	{
	42	struct ablkcipher_buffer p, tmp;
	43
	44	list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {
	45	ablkcipher_buffer_write(p);
	46	list_del(&p->entry);
	47	kfree(p);
	48	}
	49	}
	50	EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete);
	51
	52	static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk,
	53	struct ablkcipher_buffer *p)
	54	{
	55	p->dst = walk->out;
	56	list_add_tail(&p->entry, &walk->buffers);
	57	}
	58
	59	/* Get a spot of the specified length that does not straddle a page.
	60	* The caller needs to ensure that there is enough space for this operation.
	61	*/
	62	static inline u8 ablkcipher_get_spot(u8 start, unsigned int len)
	63	{
	64	u8 end_page = (u8 )(((unsigned long)(start + len - 1)) & PAGE_MASK);
a861afbc	65
bf06099d DM	66	return max(start, end_page);
	67	}
	68
318abdfb EB	69	static inline void ablkcipher_done_slow(struct ablkcipher_walk *walk,
318abdfb EB	70	unsigned int n)
bf06099d	71	{
bf06099d DM	72	for (;;) {
	73	unsigned int len_this_page = scatterwalk_pagelen(&walk->out);
	74
	75	if (len_this_page > n)
	76	len_this_page = n;
	77	scatterwalk_advance(&walk->out, n);
	78	if (n == len_this_page)
	79	break;
	80	n -= len_this_page;
5be4d4c9	81	scatterwalk_start(&walk->out, sg_next(walk->out.sg));
bf06099d	82	}
bf06099d DM	83	}
bf06099d DM	84
318abdfb EB	85	static inline void ablkcipher_done_fast(struct ablkcipher_walk *walk,
318abdfb EB	86	unsigned int n)
bf06099d DM	87	{
	88	scatterwalk_advance(&walk->in, n);
	89	scatterwalk_advance(&walk->out, n);
bf06099d DM	90	}
	91
	92	static int ablkcipher_walk_next(struct ablkcipher_request *req,
	93	struct ablkcipher_walk *walk);
	94
	95	int ablkcipher_walk_done(struct ablkcipher_request *req,
	96	struct ablkcipher_walk *walk, int err)
	97	{
	98	struct crypto_tfm *tfm = req->base.tfm;
318abdfb EB	99	unsigned int n; /* bytes processed */
318abdfb EB	100	bool more;
bf06099d	101
318abdfb EB	102	if (unlikely(err < 0))
318abdfb EB	103	goto finish;
bf06099d	104
318abdfb EB	105	n = walk->nbytes - err;
	106	walk->total -= n;
	107	more = (walk->total != 0);
bf06099d	108
318abdfb EB	109	if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW))) {
	110	ablkcipher_done_fast(walk, n);
	111	} else {
	112	if (WARN_ON(err)) {
	113	/* unexpected case; didn't process all bytes */
	114	err = -EINVAL;
	115	goto finish;
	116	}
	117	ablkcipher_done_slow(walk, n);
bf06099d DM	118	}
bf06099d DM	119
318abdfb EB	120	scatterwalk_done(&walk->in, 0, more);
318abdfb EB	121	scatterwalk_done(&walk->out, 1, more);
bf06099d	122
318abdfb	123	if (more) {
bf06099d DM	124	crypto_yield(req->base.flags);
	125	return ablkcipher_walk_next(req, walk);
	126	}
318abdfb EB	127	err = 0;
	128	finish:
	129	walk->nbytes = 0;
bf06099d DM	130	if (walk->iv != req->info)
bf06099d DM	131	memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize);
33c7c0fb	132	kfree(walk->iv_buffer);
bf06099d DM	133	return err;
	134	}
	135	EXPORT_SYMBOL_GPL(ablkcipher_walk_done);
	136
	137	static inline int ablkcipher_next_slow(struct ablkcipher_request *req,
	138	struct ablkcipher_walk *walk,
	139	unsigned int bsize,
	140	unsigned int alignmask,
	141	void src_p, void dst_p)
	142	{
	143	unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
	144	struct ablkcipher_buffer *p;
	145	void src, dst, *base;
	146	unsigned int n;
	147
	148	n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1);
	149	n += (aligned_bsize * 3 - (alignmask + 1) +
	150	(alignmask & ~(crypto_tfm_ctx_alignment() - 1)));
	151
	152	p = kmalloc(n, GFP_ATOMIC);
	153	if (!p)
2716fbf6	154	return ablkcipher_walk_done(req, walk, -ENOMEM);
bf06099d DM	155
	156	base = p + 1;
	157
	158	dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1);
	159	src = dst = ablkcipher_get_spot(dst, bsize);
	160
	161	p->len = bsize;
	162	p->data = dst;
	163
	164	scatterwalk_copychunks(src, &walk->in, bsize, 0);
	165
	166	ablkcipher_queue_write(walk, p);
	167
	168	walk->nbytes = bsize;
	169	walk->flags \|= ABLKCIPHER_WALK_SLOW;
	170
	171	*src_p = src;
	172	*dst_p = dst;
	173
	174	return 0;
	175	}
	176
	177	static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk,
	178	struct crypto_tfm *tfm,
	179	unsigned int alignmask)
	180	{
	181	unsigned bs = walk->blocksize;
	182	unsigned int ivsize = tfm->crt_ablkcipher.ivsize;
	183	unsigned aligned_bs = ALIGN(bs, alignmask + 1);
	184	unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
	185	(alignmask + 1);
	186	u8 *iv;
	187
	188	size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
	189	walk->iv_buffer = kmalloc(size, GFP_ATOMIC);
	190	if (!walk->iv_buffer)
	191	return -ENOMEM;
	192
	193	iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1);
	194	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
	195	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
	196	iv = ablkcipher_get_spot(iv, ivsize);
	197
	198	walk->iv = memcpy(iv, walk->iv, ivsize);
	199	return 0;
	200	}
	201
	202	static inline int ablkcipher_next_fast(struct ablkcipher_request *req,
	203	struct ablkcipher_walk *walk)
	204	{
	205	walk->src.page = scatterwalk_page(&walk->in);
	206	walk->src.offset = offset_in_page(walk->in.offset);
	207	walk->dst.page = scatterwalk_page(&walk->out);
	208	walk->dst.offset = offset_in_page(walk->out.offset);
	209
	210	return 0;
	211	}
	212
	213	static int ablkcipher_walk_next(struct ablkcipher_request *req,
	214	struct ablkcipher_walk *walk)
	215	{
	216	struct crypto_tfm *tfm = req->base.tfm;
	217	unsigned int alignmask, bsize, n;
	218	void src, dst;
219	int err;
220
221	alignmask = crypto_tfm_alg_alignmask(tfm);
222	n = walk->total;
223	if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) {
224	req->base.flags \|= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
225	return ablkcipher_walk_done(req, walk, -EINVAL);
226	}
227
228	walk->flags &= ~ABLKCIPHER_WALK_SLOW;
229	src = dst = NULL;
230
231	bsize = min(walk->blocksize, n);
232	n = scatterwalk_clamp(&walk->in, n);
233	n = scatterwalk_clamp(&walk->out, n);
234
235	if (n < bsize \|\|
236	!scatterwalk_aligned(&walk->in, alignmask) \|\|
237	!scatterwalk_aligned(&walk->out, alignmask)) {
238	err = ablkcipher_next_slow(req, walk, bsize, alignmask,
239	&src, &dst);
240	goto set_phys_lowmem;
241	}
242
243	walk->nbytes = n;
244
245	return ablkcipher_next_fast(req, walk);
246
247	set_phys_lowmem:
248	if (err >= 0) {
249	walk->src.page = virt_to_page(src);
250	walk->dst.page = virt_to_page(dst);
251	walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1));
252	walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1));
253	}
254
255	return err;
256	}
257
258	static int ablkcipher_walk_first(struct ablkcipher_request *req,
259	struct ablkcipher_walk *walk)
260	{
261	struct crypto_tfm *tfm = req->base.tfm;
262	unsigned int alignmask;
263
264	alignmask = crypto_tfm_alg_alignmask(tfm);
265	if (WARN_ON_ONCE(in_irq()))
266	return -EDEADLK;
267
70d906bc	268	walk->iv = req->info;
bf06099d DM	269	walk->nbytes = walk->total;
	270	if (unlikely(!walk->total))
	271	return 0;
	272
	273	walk->iv_buffer = NULL;
bf06099d DM	274	if (unlikely(((unsigned long)walk->iv & alignmask))) {
bf06099d DM	275	int err = ablkcipher_copy_iv(walk, tfm, alignmask);
a861afbc	276
bf06099d DM	277	if (err)
	278	return err;
	279	}
	280
	281	scatterwalk_start(&walk->in, walk->in.sg);
	282	scatterwalk_start(&walk->out, walk->out.sg);
	283
	284	return ablkcipher_walk_next(req, walk);
	285	}
	286
	287	int ablkcipher_walk_phys(struct ablkcipher_request *req,
	288	struct ablkcipher_walk *walk)
	289	{
	290	walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm);
	291	return ablkcipher_walk_first(req, walk);
	292	}
	293	EXPORT_SYMBOL_GPL(ablkcipher_walk_phys);
	294
791b4d5f HX	295	static int setkey_unaligned(struct crypto_ablkcipher tfm, const u8 key,
791b4d5f HX	296	unsigned int keylen)
ca7c3938 SS	297	{
	298	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	299	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
	300	int ret;
	301	u8 buffer, alignbuffer;
	302	unsigned long absize;
	303
	304	absize = keylen + alignmask;
	305	buffer = kmalloc(absize, GFP_ATOMIC);
	306	if (!buffer)
	307	return -ENOMEM;
	308
	309	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	310	memcpy(alignbuffer, key, keylen);
	311	ret = cipher->setkey(tfm, alignbuffer, keylen);
06817176	312	memset(alignbuffer, 0, keylen);
ca7c3938 SS	313	kfree(buffer);
	314	return ret;
	315	}
	316
b5b7f088 HX	317	static int setkey(struct crypto_ablkcipher tfm, const u8 key,
	318	unsigned int keylen)
	319	{
	320	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
ca7c3938	321	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
b5b7f088 HX	322
	323	if (keylen < cipher->min_keysize \|\| keylen > cipher->max_keysize) {
	324	crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	325	return -EINVAL;
	326	}
	327
ca7c3938 SS	328	if ((unsigned long)key & alignmask)
	329	return setkey_unaligned(tfm, key, keylen);
	330
b5b7f088 HX	331	return cipher->setkey(tfm, key, keylen);
	332	}
	333
	334	static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
	335	u32 mask)
	336	{
	337	return alg->cra_ctxsize;
	338	}
	339
	340	static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
	341	u32 mask)
	342	{
	343	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	344	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	345
	346	if (alg->ivsize > PAGE_SIZE / 8)
	347	return -EINVAL;
	348
	349	crt->setkey = setkey;
	350	crt->encrypt = alg->encrypt;
	351	crt->decrypt = alg->decrypt;
ecfc4329	352	crt->base = __crypto_ablkcipher_cast(tfm);
b5b7f088 HX	353	crt->ivsize = alg->ivsize;
	354
	355	return 0;
	356	}
	357
3acc8473	358	#ifdef CONFIG_NET
29ffc876 SK	359	static int crypto_ablkcipher_report(struct sk_buff skb, struct crypto_alg alg)
	360	{
	361	struct crypto_report_blkcipher rblkcipher;
	362
37db69e0 EB	363	memset(&rblkcipher, 0, sizeof(rblkcipher));
	364
	365	strscpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));
c79b411e	366	strscpy(rblkcipher.geniv, "<default>", sizeof(rblkcipher.geniv));
29ffc876 SK	367
	368	rblkcipher.blocksize = alg->cra_blocksize;
	369	rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
	370	rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
	371	rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
	372
37db69e0 EB	373	return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
37db69e0 EB	374	sizeof(rblkcipher), &rblkcipher);
29ffc876	375	}
3acc8473 HX	376	#else
	377	static int crypto_ablkcipher_report(struct sk_buff skb, struct crypto_alg alg)
	378	{
	379	return -ENOSYS;
	380	}
	381	#endif
29ffc876	382
b5b7f088	383	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	384	__maybe_unused;
b5b7f088 HX	385	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	386	{
	387	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
	388
	389	seq_printf(m, "type : ablkcipher\n");
189ed66e HX	390	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
189ed66e HX	391	"yes" : "no");
b5b7f088 HX	392	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	393	seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
	394	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	395	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
c79b411e	396	seq_printf(m, "geniv : <default>\n");
b5b7f088 HX	397	}
	398
	399	const struct crypto_type crypto_ablkcipher_type = {
	400	.ctxsize = crypto_ablkcipher_ctxsize,
	401	.init = crypto_init_ablkcipher_ops,
	402	#ifdef CONFIG_PROC_FS
	403	.show = crypto_ablkcipher_show,
	404	#endif
29ffc876	405	.report = crypto_ablkcipher_report,
b5b7f088 HX	406	};
b5b7f088 HX	407	EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);