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Name	Size	Permission	Date
internal	[ DIR ]	drwxr-xr-x	2026-06-04 06:36
acompress.h	9.26 KB	-rw-r--r--	2024-03-10 20:38
aead.h	19.47 KB	-rw-r--r--	2024-03-10 20:38
aes.h	2.5 KB	-rw-r--r--	2024-03-10 20:38
akcipher.h	15.21 KB	-rw-r--r--	2024-03-10 20:38
algapi.h	7.65 KB	-rw-r--r--	2024-03-10 20:38
arc4.h	484 B	-rw-r--r--	2024-03-10 20:38
aria.h	16.71 KB	-rw-r--r--	2024-03-10 20:38
authenc.h	635 B	-rw-r--r--	2024-03-10 20:38
b128ops.h	2.26 KB	-rw-r--r--	2024-03-10 20:38
blake2b.h	1.57 KB	-rw-r--r--	2024-03-10 20:38
blake2s.h	2.62 KB	-rw-r--r--	2024-03-10 20:38
blowfish.h	415 B	-rw-r--r--	2024-03-10 20:38
cast5.h	590 B	-rw-r--r--	2024-03-10 20:38
cast6.h	607 B	-rw-r--r--	2024-03-10 20:38
cast_common.h	232 B	-rw-r--r--	2024-03-10 20:38
chacha.h	3.32 KB	-rw-r--r--	2024-03-10 20:38
chacha20poly1305.h	1.66 KB	-rw-r--r--	2024-03-10 20:38
cryptd.h	2 KB	-rw-r--r--	2024-03-10 20:38
ctr.h	1.42 KB	-rw-r--r--	2024-03-10 20:38
curve25519.h	2.02 KB	-rw-r--r--	2024-03-10 20:38
des.h	1.68 KB	-rw-r--r--	2024-03-10 20:38
dh.h	3.03 KB	-rw-r--r--	2024-03-10 20:38
drbg.h	9.02 KB	-rw-r--r--	2024-03-10 20:38
ecc_curve.h	1.31 KB	-rw-r--r--	2024-03-10 20:38
ecdh.h	2.43 KB	-rw-r--r--	2024-03-10 20:38
engine.h	3.72 KB	-rw-r--r--	2024-03-10 20:38
gcm.h	1.48 KB	-rw-r--r--	2024-03-10 20:38
gf128mul.h	9.42 KB	-rw-r--r--	2024-03-10 20:38
ghash.h	388 B	-rw-r--r--	2024-03-10 20:38
hash.h	33.47 KB	-rw-r--r--	2026-05-26 09:55
hash_info.h	1023 B	-rw-r--r--	2024-03-10 20:38
hmac.h	173 B	-rw-r--r--	2024-03-10 20:38
if_alg.h	6.5 KB	-rw-r--r--	2026-05-26 09:55
kdf_sp800108.h	2.07 KB	-rw-r--r--	2024-03-10 20:38
kpp.h	10.9 KB	-rw-r--r--	2024-03-10 20:38
md5.h	497 B	-rw-r--r--	2024-03-10 20:38
nhpoly1305.h	2.18 KB	-rw-r--r--	2024-03-10 20:38
null.h	346 B	-rw-r--r--	2024-03-10 20:38
padlock.h	438 B	-rw-r--r--	2024-03-10 20:38
pcrypt.h	821 B	-rw-r--r--	2024-03-10 20:38
pkcs7.h	1.15 KB	-rw-r--r--	2024-03-10 20:38
poly1305.h	2.44 KB	-rw-r--r--	2024-03-10 20:38
polyval.h	445 B	-rw-r--r--	2024-03-10 20:38
public_key.h	3.59 KB	-rw-r--r--	2024-03-10 20:38
rng.h	7.72 KB	-rw-r--r--	2024-03-10 20:38
scatterwalk.h	3.69 KB	-rw-r--r--	2026-05-26 09:55
serpent.h	696 B	-rw-r--r--	2024-03-10 20:38
sha1.h	1.18 KB	-rw-r--r--	2024-03-10 20:38
sha1_base.h	2.45 KB	-rw-r--r--	2024-03-10 20:38
sha2.h	3.75 KB	-rw-r--r--	2024-03-10 20:38
sha256_base.h	3.12 KB	-rw-r--r--	2026-05-26 09:55
sha3.h	879 B	-rw-r--r--	2024-03-10 20:38
sha512_base.h	3.18 KB	-rw-r--r--	2024-03-10 20:38
sig.h	4.1 KB	-rw-r--r--	2024-03-10 20:38
skcipher.h	33.05 KB	-rw-r--r--	2024-03-10 20:38
sm2.h	745 B	-rw-r--r--	2024-03-10 20:38
sm3.h	1.6 KB	-rw-r--r--	2024-03-10 20:38
sm3_base.h	2.55 KB	-rw-r--r--	2024-03-10 20:38
sm4.h	1.22 KB	-rw-r--r--	2024-03-10 20:38
streebog.h	949 B	-rw-r--r--	2024-03-10 20:38
twofish.h	743 B	-rw-r--r--	2024-03-10 20:38
utils.h	1.89 KB	-rw-r--r--	2024-03-10 20:38
xts.h	978 B	-rw-r--r--	2024-03-10 20:38

Rename

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Cryptographic scatter and gather helpers.
 *
 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
 * Copyright (c) 2002 Adam J. Richter <adam@yggdrasil.com>
 * Copyright (c) 2004 Jean-Luc Cooke <jlcooke@certainkey.com>
 * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
 */

#ifndef _CRYPTO_SCATTERWALK_H
#define _CRYPTO_SCATTERWALK_H

#include <crypto/algapi.h>

#include <linux/highmem.h>
#include <linux/mm.h>
#include <linux/scatterlist.h>

static inline void scatterwalk_crypto_chain(struct scatterlist *head,
					    struct scatterlist *sg, int num)
{
	if (sg)
		sg_chain(head, num, sg);
	else
		sg_mark_end(head);
}

static inline unsigned int scatterwalk_pagelen(struct scatter_walk *walk)
{
	unsigned int len = walk->sg->offset + walk->sg->length - walk->offset;
	unsigned int len_this_page = offset_in_page(~walk->offset) + 1;
	return len_this_page > len ? len : len_this_page;
}

static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk,
					     unsigned int nbytes)
{
	unsigned int len_this_page = scatterwalk_pagelen(walk);
	return nbytes > len_this_page ? len_this_page : nbytes;
}

static inline void scatterwalk_advance(struct scatter_walk *walk,
				       unsigned int nbytes)
{
	walk->offset += nbytes;
}

static inline struct page *scatterwalk_page(struct scatter_walk *walk)
{
	return sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
}

static inline void scatterwalk_unmap(void *vaddr)
{
	kunmap_local(vaddr);
}

static inline void scatterwalk_start(struct scatter_walk *walk,
				     struct scatterlist *sg)
{
	walk->sg = sg;
	walk->offset = sg->offset;
}

static inline void *scatterwalk_map(struct scatter_walk *walk)
{
	return kmap_local_page(scatterwalk_page(walk)) +
	       offset_in_page(walk->offset);
}

static inline void scatterwalk_pagedone(struct scatter_walk *walk, int out,
					unsigned int more)
{
	if (out) {
		struct page *page;

page = sg_page(walk->sg) + ((walk->offset - 1) >> PAGE_SHIFT);
		flush_dcache_page(page);
	}

if (more && walk->offset >= walk->sg->offset + walk->sg->length)
		scatterwalk_start(walk, sg_next(walk->sg));
}

/*
 * Flush the dcache of any pages that overlap the region
 * [offset, offset + nbytes) relative to base_page.
 *
 * This should be called only when ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE, to ensure
 * that all relevant code (including the call to sg_page() in the caller, if
 * applicable) gets fully optimized out when !ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE.
 */
static inline void __scatterwalk_flush_dcache_pages(struct page *base_page,
						    unsigned int offset,
						    unsigned int nbytes)
{
	unsigned int num_pages;

base_page += offset / PAGE_SIZE;
	offset %= PAGE_SIZE;

/*
	 * This is an overflow-safe version of
	 * num_pages = DIV_ROUND_UP(offset + nbytes, PAGE_SIZE).
	 */
	num_pages = nbytes / PAGE_SIZE;
	num_pages += DIV_ROUND_UP(offset + (nbytes % PAGE_SIZE), PAGE_SIZE);

for (unsigned int i = 0; i < num_pages; i++)
		flush_dcache_page(base_page + i);
}

static inline void scatterwalk_done(struct scatter_walk *walk, int out,
				    int more)
{
	if (!more || walk->offset >= walk->sg->offset + walk->sg->length ||
	    !(walk->offset & (PAGE_SIZE - 1)))
		scatterwalk_pagedone(walk, out, more);
}

void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
			    size_t nbytes, int out);

void memcpy_sglist(struct scatterlist *dst, struct scatterlist *src,
		   unsigned int nbytes);

void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
			      unsigned int start, unsigned int nbytes, int out);

struct scatterlist *scatterwalk_ffwd(struct scatterlist dst[2],
				     struct scatterlist *src,
				     unsigned int len);

#endif  /* _CRYPTO_SCATTERWALK_H */