[linux.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 <[email protected]>
 *
 * 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 <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 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)
	__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        : %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)
	__maybe_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 <[email protected]>
	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	21	#include <linux/cryptouser.h>
d8c34b94	22	#include <linux/compiler.h>
29ffc876	23	#include <net/netlink.h>
b5b7f088	24
bf06099d DM	25	#include <crypto/scatterwalk.h>
bf06099d DM	26
378f4f51 HX	27	#include "internal.h"
378f4f51 HX	28
bf06099d DM	29	struct ablkcipher_buffer {
	30	struct list_head entry;
	31	struct scatter_walk dst;
	32	unsigned int len;
	33	void *data;
	34	};
	35
	36	enum {
	37	ABLKCIPHER_WALK_SLOW = 1 << 0,
	38	};
	39
	40	static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p)
	41	{
	42	scatterwalk_copychunks(p->data, &p->dst, p->len, 1);
	43	}
	44
	45	void __ablkcipher_walk_complete(struct ablkcipher_walk *walk)
	46	{
	47	struct ablkcipher_buffer p, tmp;
	48
	49	list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {
	50	ablkcipher_buffer_write(p);
	51	list_del(&p->entry);
	52	kfree(p);
	53	}
	54	}
	55	EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete);
	56
	57	static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk,
	58	struct ablkcipher_buffer *p)
	59	{
	60	p->dst = walk->out;
	61	list_add_tail(&p->entry, &walk->buffers);
	62	}
	63
	64	/* Get a spot of the specified length that does not straddle a page.
	65	* The caller needs to ensure that there is enough space for this operation.
	66	*/
	67	static inline u8 ablkcipher_get_spot(u8 start, unsigned int len)
	68	{
	69	u8 end_page = (u8 )(((unsigned long)(start + len - 1)) & PAGE_MASK);
a861afbc	70
bf06099d DM	71	return max(start, end_page);
	72	}
	73
	74	static inline unsigned int ablkcipher_done_slow(struct ablkcipher_walk *walk,
	75	unsigned int bsize)
	76	{
	77	unsigned int n = bsize;
	78
	79	for (;;) {
	80	unsigned int len_this_page = scatterwalk_pagelen(&walk->out);
	81
	82	if (len_this_page > n)
	83	len_this_page = n;
	84	scatterwalk_advance(&walk->out, n);
	85	if (n == len_this_page)
	86	break;
	87	n -= len_this_page;
5be4d4c9	88	scatterwalk_start(&walk->out, sg_next(walk->out.sg));
bf06099d DM	89	}
	90
	91	return bsize;
	92	}
	93
	94	static inline unsigned int ablkcipher_done_fast(struct ablkcipher_walk *walk,
	95	unsigned int n)
	96	{
	97	scatterwalk_advance(&walk->in, n);
	98	scatterwalk_advance(&walk->out, n);
	99
	100	return n;
	101	}
	102
	103	static int ablkcipher_walk_next(struct ablkcipher_request *req,
	104	struct ablkcipher_walk *walk);
	105
	106	int ablkcipher_walk_done(struct ablkcipher_request *req,
	107	struct ablkcipher_walk *walk, int err)
	108	{
	109	struct crypto_tfm *tfm = req->base.tfm;
	110	unsigned int nbytes = 0;
	111
	112	if (likely(err >= 0)) {
	113	unsigned int n = walk->nbytes - err;
	114
	115	if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW)))
	116	n = ablkcipher_done_fast(walk, n);
	117	else if (WARN_ON(err)) {
	118	err = -EINVAL;
	119	goto err;
	120	} else
	121	n = ablkcipher_done_slow(walk, n);
	122
	123	nbytes = walk->total - n;
	124	err = 0;
	125	}
	126
	127	scatterwalk_done(&walk->in, 0, nbytes);
	128	scatterwalk_done(&walk->out, 1, nbytes);
	129
	130	err:
	131	walk->total = nbytes;
	132	walk->nbytes = nbytes;
	133
	134	if (nbytes) {
	135	crypto_yield(req->base.flags);
	136	return ablkcipher_walk_next(req, walk);
	137	}
	138
	139	if (walk->iv != req->info)
	140	memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize);
33c7c0fb	141	kfree(walk->iv_buffer);
bf06099d DM	142
	143	return err;
	144	}
	145	EXPORT_SYMBOL_GPL(ablkcipher_walk_done);
	146
	147	static inline int ablkcipher_next_slow(struct ablkcipher_request *req,
	148	struct ablkcipher_walk *walk,
	149	unsigned int bsize,
	150	unsigned int alignmask,
	151	void src_p, void dst_p)
	152	{
	153	unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
	154	struct ablkcipher_buffer *p;
	155	void src, dst, *base;
	156	unsigned int n;
	157
	158	n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1);
	159	n += (aligned_bsize * 3 - (alignmask + 1) +
	160	(alignmask & ~(crypto_tfm_ctx_alignment() - 1)));
	161
	162	p = kmalloc(n, GFP_ATOMIC);
	163	if (!p)
2716fbf6	164	return ablkcipher_walk_done(req, walk, -ENOMEM);
bf06099d DM	165
	166	base = p + 1;
	167
	168	dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1);
	169	src = dst = ablkcipher_get_spot(dst, bsize);
	170
	171	p->len = bsize;
	172	p->data = dst;
	173
	174	scatterwalk_copychunks(src, &walk->in, bsize, 0);
	175
	176	ablkcipher_queue_write(walk, p);
	177
	178	walk->nbytes = bsize;
	179	walk->flags \|= ABLKCIPHER_WALK_SLOW;
	180
	181	*src_p = src;
	182	*dst_p = dst;
	183
	184	return 0;
	185	}
	186
	187	static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk,
	188	struct crypto_tfm *tfm,
	189	unsigned int alignmask)
	190	{
	191	unsigned bs = walk->blocksize;
	192	unsigned int ivsize = tfm->crt_ablkcipher.ivsize;
	193	unsigned aligned_bs = ALIGN(bs, alignmask + 1);
	194	unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
	195	(alignmask + 1);
	196	u8 *iv;
	197
	198	size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
	199	walk->iv_buffer = kmalloc(size, GFP_ATOMIC);
	200	if (!walk->iv_buffer)
	201	return -ENOMEM;
	202
	203	iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1);
	204	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
	205	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
	206	iv = ablkcipher_get_spot(iv, ivsize);
	207
	208	walk->iv = memcpy(iv, walk->iv, ivsize);
	209	return 0;
	210	}
	211
	212	static inline int ablkcipher_next_fast(struct ablkcipher_request *req,
	213	struct ablkcipher_walk *walk)
	214	{
	215	walk->src.page = scatterwalk_page(&walk->in);
	216	walk->src.offset = offset_in_page(walk->in.offset);
	217	walk->dst.page = scatterwalk_page(&walk->out);
	218	walk->dst.offset = offset_in_page(walk->out.offset);
	219
	220	return 0;
	221	}
	222
	223	static int ablkcipher_walk_next(struct ablkcipher_request *req,
	224	struct ablkcipher_walk *walk)
	225	{
	226	struct crypto_tfm *tfm = req->base.tfm;
	227	unsigned int alignmask, bsize, n;
	228	void src, dst;
229	int err;
230
231	alignmask = crypto_tfm_alg_alignmask(tfm);
232	n = walk->total;
233	if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) {
234	req->base.flags \|= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
235	return ablkcipher_walk_done(req, walk, -EINVAL);
236	}
237
238	walk->flags &= ~ABLKCIPHER_WALK_SLOW;
239	src = dst = NULL;
240
241	bsize = min(walk->blocksize, n);
242	n = scatterwalk_clamp(&walk->in, n);
243	n = scatterwalk_clamp(&walk->out, n);
244
245	if (n < bsize \|\|
246	!scatterwalk_aligned(&walk->in, alignmask) \|\|
247	!scatterwalk_aligned(&walk->out, alignmask)) {
248	err = ablkcipher_next_slow(req, walk, bsize, alignmask,
249	&src, &dst);
250	goto set_phys_lowmem;
251	}
252
253	walk->nbytes = n;
254
255	return ablkcipher_next_fast(req, walk);
256
257	set_phys_lowmem:
258	if (err >= 0) {
259	walk->src.page = virt_to_page(src);
260	walk->dst.page = virt_to_page(dst);
261	walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1));
262	walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1));
263	}
264
265	return err;
266	}
267
268	static int ablkcipher_walk_first(struct ablkcipher_request *req,
269	struct ablkcipher_walk *walk)
270	{
271	struct crypto_tfm *tfm = req->base.tfm;
272	unsigned int alignmask;
273
274	alignmask = crypto_tfm_alg_alignmask(tfm);
275	if (WARN_ON_ONCE(in_irq()))
276	return -EDEADLK;
277
70d906bc	278	walk->iv = req->info;
bf06099d DM	279	walk->nbytes = walk->total;
	280	if (unlikely(!walk->total))
	281	return 0;
	282
	283	walk->iv_buffer = NULL;
bf06099d DM	284	if (unlikely(((unsigned long)walk->iv & alignmask))) {
bf06099d DM	285	int err = ablkcipher_copy_iv(walk, tfm, alignmask);
a861afbc	286
bf06099d DM	287	if (err)
	288	return err;
	289	}
	290
	291	scatterwalk_start(&walk->in, walk->in.sg);
	292	scatterwalk_start(&walk->out, walk->out.sg);
	293
	294	return ablkcipher_walk_next(req, walk);
	295	}
	296
	297	int ablkcipher_walk_phys(struct ablkcipher_request *req,
	298	struct ablkcipher_walk *walk)
	299	{
	300	walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm);
	301	return ablkcipher_walk_first(req, walk);
	302	}
	303	EXPORT_SYMBOL_GPL(ablkcipher_walk_phys);
	304
791b4d5f HX	305	static int setkey_unaligned(struct crypto_ablkcipher tfm, const u8 key,
791b4d5f HX	306	unsigned int keylen)
ca7c3938 SS	307	{
	308	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	309	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
	310	int ret;
	311	u8 buffer, alignbuffer;
	312	unsigned long absize;
	313
	314	absize = keylen + alignmask;
	315	buffer = kmalloc(absize, GFP_ATOMIC);
	316	if (!buffer)
	317	return -ENOMEM;
	318
	319	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	320	memcpy(alignbuffer, key, keylen);
	321	ret = cipher->setkey(tfm, alignbuffer, keylen);
06817176	322	memset(alignbuffer, 0, keylen);
ca7c3938 SS	323	kfree(buffer);
	324	return ret;
	325	}
	326
b5b7f088 HX	327	static int setkey(struct crypto_ablkcipher tfm, const u8 key,
	328	unsigned int keylen)
	329	{
	330	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
ca7c3938	331	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
b5b7f088 HX	332
	333	if (keylen < cipher->min_keysize \|\| keylen > cipher->max_keysize) {
	334	crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	335	return -EINVAL;
	336	}
	337
ca7c3938 SS	338	if ((unsigned long)key & alignmask)
	339	return setkey_unaligned(tfm, key, keylen);
	340
b5b7f088 HX	341	return cipher->setkey(tfm, key, keylen);
	342	}
	343
	344	static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
	345	u32 mask)
	346	{
	347	return alg->cra_ctxsize;
	348	}
	349
	350	static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
	351	u32 mask)
	352	{
	353	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	354	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	355
	356	if (alg->ivsize > PAGE_SIZE / 8)
	357	return -EINVAL;
	358
	359	crt->setkey = setkey;
	360	crt->encrypt = alg->encrypt;
	361	crt->decrypt = alg->decrypt;
ecfc4329	362	crt->base = __crypto_ablkcipher_cast(tfm);
b5b7f088 HX	363	crt->ivsize = alg->ivsize;
	364
	365	return 0;
	366	}
	367
3acc8473	368	#ifdef CONFIG_NET
29ffc876 SK	369	static int crypto_ablkcipher_report(struct sk_buff skb, struct crypto_alg alg)
	370	{
	371	struct crypto_report_blkcipher rblkcipher;
	372
9a5467bf MK	373	strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));
	374	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",
	375	sizeof(rblkcipher.geniv));
29ffc876 SK	376
	377	rblkcipher.blocksize = alg->cra_blocksize;
	378	rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
	379	rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
	380	rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
	381
6662df33 DM	382	if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
	383	sizeof(struct crypto_report_blkcipher), &rblkcipher))
	384	goto nla_put_failure;
29ffc876 SK	385	return 0;
	386
	387	nla_put_failure:
	388	return -EMSGSIZE;
	389	}
3acc8473 HX	390	#else
	391	static int crypto_ablkcipher_report(struct sk_buff skb, struct crypto_alg alg)
	392	{
	393	return -ENOSYS;
	394	}
	395	#endif
29ffc876	396
b5b7f088	397	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	398	__maybe_unused;
b5b7f088 HX	399	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	400	{
	401	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
	402
	403	seq_printf(m, "type : ablkcipher\n");
189ed66e HX	404	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
189ed66e HX	405	"yes" : "no");
b5b7f088 HX	406	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	407	seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
	408	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	409	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
23508e11	410	seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>");
b5b7f088 HX	411	}
	412
	413	const struct crypto_type crypto_ablkcipher_type = {
	414	.ctxsize = crypto_ablkcipher_ctxsize,
	415	.init = crypto_init_ablkcipher_ops,
	416	#ifdef CONFIG_PROC_FS
	417	.show = crypto_ablkcipher_show,
	418	#endif
29ffc876	419	.report = crypto_ablkcipher_report,
b5b7f088 HX	420	};
	421	EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
	422
61da88e2 HX	423	static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
	424	u32 mask)
	425	{
	426	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	427	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	428
	429	if (alg->ivsize > PAGE_SIZE / 8)
	430	return -EINVAL;
	431
ecfc4329 HX	432	crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
ecfc4329 HX	433	alg->setkey : setkey;
61da88e2 HX	434	crt->encrypt = alg->encrypt;
61da88e2 HX	435	crt->decrypt = alg->decrypt;
ecfc4329	436	crt->base = __crypto_ablkcipher_cast(tfm);
61da88e2 HX	437	crt->ivsize = alg->ivsize;
	438
	439	return 0;
	440	}
	441
3acc8473	442	#ifdef CONFIG_NET
3e29c109 SK	443	static int crypto_givcipher_report(struct sk_buff skb, struct crypto_alg alg)
	444	{
	445	struct crypto_report_blkcipher rblkcipher;
	446
9a5467bf MK	447	strncpy(rblkcipher.type, "givcipher", sizeof(rblkcipher.type));
	448	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<built-in>",
	449	sizeof(rblkcipher.geniv));
3e29c109 SK	450
	451	rblkcipher.blocksize = alg->cra_blocksize;
	452	rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
	453	rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
	454	rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
	455
6662df33 DM	456	if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
	457	sizeof(struct crypto_report_blkcipher), &rblkcipher))
	458	goto nla_put_failure;
3e29c109 SK	459	return 0;
	460
	461	nla_put_failure:
	462	return -EMSGSIZE;
	463	}
3acc8473 HX	464	#else
	465	static int crypto_givcipher_report(struct sk_buff skb, struct crypto_alg alg)
	466	{
	467	return -ENOSYS;
	468	}
	469	#endif
3e29c109	470
61da88e2	471	static void crypto_givcipher_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	472	__maybe_unused;
61da88e2 HX	473	static void crypto_givcipher_show(struct seq_file m, struct crypto_alg alg)
	474	{
	475	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
	476
	477	seq_printf(m, "type : givcipher\n");
189ed66e HX	478	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
189ed66e HX	479	"yes" : "no");
61da88e2 HX	480	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	481	seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
	482	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	483	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
23508e11	484	seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>");
61da88e2 HX	485	}
	486
	487	const struct crypto_type crypto_givcipher_type = {
	488	.ctxsize = crypto_ablkcipher_ctxsize,
	489	.init = crypto_init_givcipher_ops,
	490	#ifdef CONFIG_PROC_FS
	491	.show = crypto_givcipher_show,
	492	#endif
3e29c109	493	.report = crypto_givcipher_report,
61da88e2 HX	494	};
61da88e2 HX	495	EXPORT_SYMBOL_GPL(crypto_givcipher_type);