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/* 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 unsigned int scatterwalk_aligned(struct scatter_walk *walk,
unsigned int alignmask)
{
return !(walk->offset & alignmask);
}
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_atomic(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_atomic(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;
unsigned int i;
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 (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 *scatterwalk_map(struct scatter_walk *walk);
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 */
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| internal | Folder | 0755 |
|
|
| acompress.h | File | 8.9 KB | 0644 |
|
| aead.h | File | 18.44 KB | 0644 |
|
| aes.h | File | 2.5 KB | 0644 |
|
| akcipher.h | File | 12.92 KB | 0644 |
|
| algapi.h | File | 7.22 KB | 0644 |
|
| arc4.h | File | 484 B | 0644 |
|
| asym_tpm_subtype.h | File | 521 B | 0644 |
|
| authenc.h | File | 635 B | 0644 |
|
| b128ops.h | File | 2.26 KB | 0644 |
|
| blake2b.h | File | 1.57 KB | 0644 |
|
| blake2s.h | File | 2.72 KB | 0644 |
|
| blowfish.h | File | 415 B | 0644 |
|
| cast5.h | File | 590 B | 0644 |
|
| cast6.h | File | 607 B | 0644 |
|
| cast_common.h | File | 232 B | 0644 |
|
| chacha.h | File | 3.32 KB | 0644 |
|
| chacha20poly1305.h | File | 1.66 KB | 0644 |
|
| cryptd.h | File | 2 KB | 0644 |
|
| ctr.h | File | 1.42 KB | 0644 |
|
| curve25519.h | File | 2.02 KB | 0644 |
|
| des.h | File | 1.68 KB | 0644 |
|
| dh.h | File | 3.03 KB | 0644 |
|
| drbg.h | File | 8.99 KB | 0644 |
|
| ecc_curve.h | File | 1.31 KB | 0644 |
|
| ecdh.h | File | 2.43 KB | 0644 |
|
| engine.h | File | 3.78 KB | 0644 |
|
| gcm.h | File | 867 B | 0644 |
|
| gf128mul.h | File | 9.42 KB | 0644 |
|
| ghash.h | File | 388 B | 0644 |
|
| hash.h | File | 34.11 KB | 0644 |
|
| hash_info.h | File | 998 B | 0644 |
|
| hkdf.h | File | 524 B | 0644 |
|
| hmac.h | File | 173 B | 0644 |
|
| if_alg.h | File | 6.56 KB | 0644 |
|
| kpp.h | File | 9.97 KB | 0644 |
|
| md5.h | File | 497 B | 0644 |
|
| nhpoly1305.h | File | 2.18 KB | 0644 |
|
| null.h | File | 346 B | 0644 |
|
| padlock.h | File | 438 B | 0644 |
|
| pcrypt.h | File | 821 B | 0644 |
|
| pkcs7.h | File | 1.15 KB | 0644 |
|
| poly1305.h | File | 2.44 KB | 0644 |
|
| public_key.h | File | 3.63 KB | 0644 |
|
| rng.h | File | 6.59 KB | 0644 |
|
| scatterwalk.h | File | 3.89 KB | 0644 |
|
| serpent.h | File | 696 B | 0644 |
|
| sha1.h | File | 1.18 KB | 0644 |
|
| sha1_base.h | File | 2.45 KB | 0644 |
|
| sha2.h | File | 3.76 KB | 0644 |
|
| sha256_base.h | File | 2.56 KB | 0644 |
|
| sha3.h | File | 879 B | 0644 |
|
| sha512_base.h | File | 3.18 KB | 0644 |
|
| skcipher.h | File | 20.03 KB | 0644 |
|
| sm2.h | File | 749 B | 0644 |
|
| sm3.h | File | 897 B | 0644 |
|
| sm3_base.h | File | 2.55 KB | 0644 |
|
| sm4.h | File | 754 B | 0644 |
|
| streebog.h | File | 949 B | 0644 |
|
| twofish.h | File | 743 B | 0644 |
|
| xts.h | File | 978 B | 0644 |
|