[linux-2.6-block.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 <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;

	strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));
	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",
		sizeof(rblkcipher.geniv));
	rblkcipher.geniv[sizeof(rblkcipher.geniv) - 1] = '\0';

	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.geniv[sizeof(rblkcipher.geniv) - 1] = '\0';

	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 <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	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
318abdfb EB	74	static inline void ablkcipher_done_slow(struct ablkcipher_walk *walk,
318abdfb EB	75	unsigned int n)
bf06099d	76	{
bf06099d DM	77	for (;;) {
	78	unsigned int len_this_page = scatterwalk_pagelen(&walk->out);
	79
	80	if (len_this_page > n)
	81	len_this_page = n;
	82	scatterwalk_advance(&walk->out, n);
	83	if (n == len_this_page)
	84	break;
	85	n -= len_this_page;
5be4d4c9	86	scatterwalk_start(&walk->out, sg_next(walk->out.sg));
bf06099d	87	}
bf06099d DM	88	}
bf06099d DM	89
318abdfb EB	90	static inline void ablkcipher_done_fast(struct ablkcipher_walk *walk,
318abdfb EB	91	unsigned int n)
bf06099d DM	92	{
	93	scatterwalk_advance(&walk->in, n);
	94	scatterwalk_advance(&walk->out, n);
bf06099d DM	95	}
	96
	97	static int ablkcipher_walk_next(struct ablkcipher_request *req,
	98	struct ablkcipher_walk *walk);
	99
	100	int ablkcipher_walk_done(struct ablkcipher_request *req,
	101	struct ablkcipher_walk *walk, int err)
	102	{
	103	struct crypto_tfm *tfm = req->base.tfm;
318abdfb EB	104	unsigned int n; /* bytes processed */
318abdfb EB	105	bool more;
bf06099d	106
318abdfb EB	107	if (unlikely(err < 0))
318abdfb EB	108	goto finish;
bf06099d	109
318abdfb EB	110	n = walk->nbytes - err;
	111	walk->total -= n;
	112	more = (walk->total != 0);
bf06099d	113
318abdfb EB	114	if (likely(!(walk->flags & ABLKCIPHER_WALK_SLOW))) {
	115	ablkcipher_done_fast(walk, n);
	116	} else {
	117	if (WARN_ON(err)) {
	118	/* unexpected case; didn't process all bytes */
	119	err = -EINVAL;
	120	goto finish;
	121	}
	122	ablkcipher_done_slow(walk, n);
bf06099d DM	123	}
bf06099d DM	124
318abdfb EB	125	scatterwalk_done(&walk->in, 0, more);
318abdfb EB	126	scatterwalk_done(&walk->out, 1, more);
bf06099d	127
318abdfb	128	if (more) {
bf06099d DM	129	crypto_yield(req->base.flags);
	130	return ablkcipher_walk_next(req, walk);
	131	}
318abdfb EB	132	err = 0;
	133	finish:
	134	walk->nbytes = 0;
bf06099d DM	135	if (walk->iv != req->info)
bf06099d DM	136	memcpy(req->info, walk->iv, tfm->crt_ablkcipher.ivsize);
33c7c0fb	137	kfree(walk->iv_buffer);
bf06099d DM	138	return err;
	139	}
	140	EXPORT_SYMBOL_GPL(ablkcipher_walk_done);
	141
	142	static inline int ablkcipher_next_slow(struct ablkcipher_request *req,
	143	struct ablkcipher_walk *walk,
	144	unsigned int bsize,
	145	unsigned int alignmask,
	146	void src_p, void dst_p)
	147	{
	148	unsigned aligned_bsize = ALIGN(bsize, alignmask + 1);
	149	struct ablkcipher_buffer *p;
	150	void src, dst, *base;
	151	unsigned int n;
	152
	153	n = ALIGN(sizeof(struct ablkcipher_buffer), alignmask + 1);
	154	n += (aligned_bsize * 3 - (alignmask + 1) +
	155	(alignmask & ~(crypto_tfm_ctx_alignment() - 1)));
	156
	157	p = kmalloc(n, GFP_ATOMIC);
	158	if (!p)
2716fbf6	159	return ablkcipher_walk_done(req, walk, -ENOMEM);
bf06099d DM	160
	161	base = p + 1;
	162
	163	dst = (u8 *)ALIGN((unsigned long)base, alignmask + 1);
	164	src = dst = ablkcipher_get_spot(dst, bsize);
	165
	166	p->len = bsize;
	167	p->data = dst;
	168
	169	scatterwalk_copychunks(src, &walk->in, bsize, 0);
	170
	171	ablkcipher_queue_write(walk, p);
	172
	173	walk->nbytes = bsize;
	174	walk->flags \|= ABLKCIPHER_WALK_SLOW;
	175
	176	*src_p = src;
	177	*dst_p = dst;
	178
	179	return 0;
	180	}
	181
	182	static inline int ablkcipher_copy_iv(struct ablkcipher_walk *walk,
	183	struct crypto_tfm *tfm,
	184	unsigned int alignmask)
	185	{
	186	unsigned bs = walk->blocksize;
	187	unsigned int ivsize = tfm->crt_ablkcipher.ivsize;
	188	unsigned aligned_bs = ALIGN(bs, alignmask + 1);
	189	unsigned int size = aligned_bs * 2 + ivsize + max(aligned_bs, ivsize) -
	190	(alignmask + 1);
	191	u8 *iv;
	192
	193	size += alignmask & ~(crypto_tfm_ctx_alignment() - 1);
	194	walk->iv_buffer = kmalloc(size, GFP_ATOMIC);
	195	if (!walk->iv_buffer)
	196	return -ENOMEM;
	197
	198	iv = (u8 *)ALIGN((unsigned long)walk->iv_buffer, alignmask + 1);
	199	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
	200	iv = ablkcipher_get_spot(iv, bs) + aligned_bs;
	201	iv = ablkcipher_get_spot(iv, ivsize);
	202
	203	walk->iv = memcpy(iv, walk->iv, ivsize);
	204	return 0;
	205	}
	206
	207	static inline int ablkcipher_next_fast(struct ablkcipher_request *req,
	208	struct ablkcipher_walk *walk)
	209	{
	210	walk->src.page = scatterwalk_page(&walk->in);
	211	walk->src.offset = offset_in_page(walk->in.offset);
	212	walk->dst.page = scatterwalk_page(&walk->out);
	213	walk->dst.offset = offset_in_page(walk->out.offset);
	214
	215	return 0;
	216	}
	217
	218	static int ablkcipher_walk_next(struct ablkcipher_request *req,
	219	struct ablkcipher_walk *walk)
	220	{
	221	struct crypto_tfm *tfm = req->base.tfm;
	222	unsigned int alignmask, bsize, n;
	223	void src, dst;
224	int err;
225
226	alignmask = crypto_tfm_alg_alignmask(tfm);
227	n = walk->total;
228	if (unlikely(n < crypto_tfm_alg_blocksize(tfm))) {
229	req->base.flags \|= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
230	return ablkcipher_walk_done(req, walk, -EINVAL);
231	}
232
233	walk->flags &= ~ABLKCIPHER_WALK_SLOW;
234	src = dst = NULL;
235
236	bsize = min(walk->blocksize, n);
237	n = scatterwalk_clamp(&walk->in, n);
238	n = scatterwalk_clamp(&walk->out, n);
239
240	if (n < bsize \|\|
241	!scatterwalk_aligned(&walk->in, alignmask) \|\|
242	!scatterwalk_aligned(&walk->out, alignmask)) {
243	err = ablkcipher_next_slow(req, walk, bsize, alignmask,
244	&src, &dst);
245	goto set_phys_lowmem;
246	}
247
248	walk->nbytes = n;
249
250	return ablkcipher_next_fast(req, walk);
251
252	set_phys_lowmem:
253	if (err >= 0) {
254	walk->src.page = virt_to_page(src);
255	walk->dst.page = virt_to_page(dst);
256	walk->src.offset = ((unsigned long)src & (PAGE_SIZE - 1));
257	walk->dst.offset = ((unsigned long)dst & (PAGE_SIZE - 1));
258	}
259
260	return err;
261	}
262
263	static int ablkcipher_walk_first(struct ablkcipher_request *req,
264	struct ablkcipher_walk *walk)
265	{
266	struct crypto_tfm *tfm = req->base.tfm;
267	unsigned int alignmask;
268
269	alignmask = crypto_tfm_alg_alignmask(tfm);
270	if (WARN_ON_ONCE(in_irq()))
271	return -EDEADLK;
272
70d906bc	273	walk->iv = req->info;
bf06099d DM	274	walk->nbytes = walk->total;
	275	if (unlikely(!walk->total))
	276	return 0;
	277
	278	walk->iv_buffer = NULL;
bf06099d DM	279	if (unlikely(((unsigned long)walk->iv & alignmask))) {
bf06099d DM	280	int err = ablkcipher_copy_iv(walk, tfm, alignmask);
a861afbc	281
bf06099d DM	282	if (err)
	283	return err;
	284	}
	285
	286	scatterwalk_start(&walk->in, walk->in.sg);
	287	scatterwalk_start(&walk->out, walk->out.sg);
	288
	289	return ablkcipher_walk_next(req, walk);
	290	}
	291
	292	int ablkcipher_walk_phys(struct ablkcipher_request *req,
	293	struct ablkcipher_walk *walk)
	294	{
	295	walk->blocksize = crypto_tfm_alg_blocksize(req->base.tfm);
	296	return ablkcipher_walk_first(req, walk);
	297	}
	298	EXPORT_SYMBOL_GPL(ablkcipher_walk_phys);
	299
791b4d5f HX	300	static int setkey_unaligned(struct crypto_ablkcipher tfm, const u8 key,
791b4d5f HX	301	unsigned int keylen)
ca7c3938 SS	302	{
	303	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
	304	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
	305	int ret;
	306	u8 buffer, alignbuffer;
	307	unsigned long absize;
	308
	309	absize = keylen + alignmask;
	310	buffer = kmalloc(absize, GFP_ATOMIC);
	311	if (!buffer)
	312	return -ENOMEM;
	313
	314	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	315	memcpy(alignbuffer, key, keylen);
	316	ret = cipher->setkey(tfm, alignbuffer, keylen);
06817176	317	memset(alignbuffer, 0, keylen);
ca7c3938 SS	318	kfree(buffer);
	319	return ret;
	320	}
	321
b5b7f088 HX	322	static int setkey(struct crypto_ablkcipher tfm, const u8 key,
	323	unsigned int keylen)
	324	{
	325	struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
ca7c3938	326	unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
b5b7f088 HX	327
	328	if (keylen < cipher->min_keysize \|\| keylen > cipher->max_keysize) {
	329	crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	330	return -EINVAL;
	331	}
	332
ca7c3938 SS	333	if ((unsigned long)key & alignmask)
	334	return setkey_unaligned(tfm, key, keylen);
	335
b5b7f088 HX	336	return cipher->setkey(tfm, key, keylen);
	337	}
	338
	339	static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
	340	u32 mask)
	341	{
	342	return alg->cra_ctxsize;
	343	}
	344
	345	static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
	346	u32 mask)
	347	{
	348	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	349	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	350
	351	if (alg->ivsize > PAGE_SIZE / 8)
	352	return -EINVAL;
	353
	354	crt->setkey = setkey;
	355	crt->encrypt = alg->encrypt;
	356	crt->decrypt = alg->decrypt;
ecfc4329	357	crt->base = __crypto_ablkcipher_cast(tfm);
b5b7f088 HX	358	crt->ivsize = alg->ivsize;
	359
	360	return 0;
	361	}
	362
3acc8473	363	#ifdef CONFIG_NET
29ffc876 SK	364	static int crypto_ablkcipher_report(struct sk_buff skb, struct crypto_alg alg)
	365	{
	366	struct crypto_report_blkcipher rblkcipher;
	367
9a5467bf MK	368	strncpy(rblkcipher.type, "ablkcipher", sizeof(rblkcipher.type));
	369	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<default>",
	370	sizeof(rblkcipher.geniv));
cefd769f	371	rblkcipher.geniv[sizeof(rblkcipher.geniv) - 1] = '\0';
29ffc876 SK	372
	373	rblkcipher.blocksize = alg->cra_blocksize;
	374	rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
	375	rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
	376	rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
	377
6662df33 DM	378	if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
	379	sizeof(struct crypto_report_blkcipher), &rblkcipher))
	380	goto nla_put_failure;
29ffc876 SK	381	return 0;
	382
	383	nla_put_failure:
	384	return -EMSGSIZE;
	385	}
3acc8473 HX	386	#else
	387	static int crypto_ablkcipher_report(struct sk_buff skb, struct crypto_alg alg)
	388	{
	389	return -ENOSYS;
	390	}
	391	#endif
29ffc876	392
b5b7f088	393	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	394	__maybe_unused;
b5b7f088 HX	395	static void crypto_ablkcipher_show(struct seq_file m, struct crypto_alg alg)
	396	{
	397	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
	398
	399	seq_printf(m, "type : ablkcipher\n");
189ed66e HX	400	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
189ed66e HX	401	"yes" : "no");
b5b7f088 HX	402	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	403	seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
	404	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	405	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
23508e11	406	seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>");
b5b7f088 HX	407	}
	408
	409	const struct crypto_type crypto_ablkcipher_type = {
	410	.ctxsize = crypto_ablkcipher_ctxsize,
	411	.init = crypto_init_ablkcipher_ops,
	412	#ifdef CONFIG_PROC_FS
	413	.show = crypto_ablkcipher_show,
	414	#endif
29ffc876	415	.report = crypto_ablkcipher_report,
b5b7f088 HX	416	};
	417	EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
	418
61da88e2 HX	419	static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
	420	u32 mask)
	421	{
	422	struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
	423	struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
	424
	425	if (alg->ivsize > PAGE_SIZE / 8)
	426	return -EINVAL;
	427
ecfc4329 HX	428	crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
ecfc4329 HX	429	alg->setkey : setkey;
61da88e2 HX	430	crt->encrypt = alg->encrypt;
61da88e2 HX	431	crt->decrypt = alg->decrypt;
ecfc4329	432	crt->base = __crypto_ablkcipher_cast(tfm);
61da88e2 HX	433	crt->ivsize = alg->ivsize;
	434
	435	return 0;
	436	}
	437
3acc8473	438	#ifdef CONFIG_NET
3e29c109 SK	439	static int crypto_givcipher_report(struct sk_buff skb, struct crypto_alg alg)
	440	{
	441	struct crypto_report_blkcipher rblkcipher;
	442
9a5467bf MK	443	strncpy(rblkcipher.type, "givcipher", sizeof(rblkcipher.type));
	444	strncpy(rblkcipher.geniv, alg->cra_ablkcipher.geniv ?: "<built-in>",
	445	sizeof(rblkcipher.geniv));
cefd769f	446	rblkcipher.geniv[sizeof(rblkcipher.geniv) - 1] = '\0';
3e29c109 SK	447
	448	rblkcipher.blocksize = alg->cra_blocksize;
	449	rblkcipher.min_keysize = alg->cra_ablkcipher.min_keysize;
	450	rblkcipher.max_keysize = alg->cra_ablkcipher.max_keysize;
	451	rblkcipher.ivsize = alg->cra_ablkcipher.ivsize;
	452
6662df33 DM	453	if (nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
	454	sizeof(struct crypto_report_blkcipher), &rblkcipher))
	455	goto nla_put_failure;
3e29c109 SK	456	return 0;
	457
	458	nla_put_failure:
	459	return -EMSGSIZE;
	460	}
3acc8473 HX	461	#else
	462	static int crypto_givcipher_report(struct sk_buff skb, struct crypto_alg alg)
	463	{
	464	return -ENOSYS;
	465	}
	466	#endif
3e29c109	467
61da88e2	468	static void crypto_givcipher_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	469	__maybe_unused;
61da88e2 HX	470	static void crypto_givcipher_show(struct seq_file m, struct crypto_alg alg)
	471	{
	472	struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
	473
	474	seq_printf(m, "type : givcipher\n");
189ed66e HX	475	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
189ed66e HX	476	"yes" : "no");
61da88e2 HX	477	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	478	seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
	479	seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
	480	seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
23508e11	481	seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>");
61da88e2 HX	482	}
	483
	484	const struct crypto_type crypto_givcipher_type = {
	485	.ctxsize = crypto_ablkcipher_ctxsize,
	486	.init = crypto_init_givcipher_ops,
	487	#ifdef CONFIG_PROC_FS
	488	.show = crypto_givcipher_show,
	489	#endif
3e29c109	490	.report = crypto_givcipher_report,
61da88e2 HX	491	};
61da88e2 HX	492	EXPORT_SYMBOL_GPL(crypto_givcipher_type);