https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 3906fe9bb7f1a2c8667ae54e967dc8690824f4ea authored by Linus Torvalds on 25 October 2021, 18:30:31 UTC
Linux 5.15-rc7
Linux 5.15-rc7
Tip revision: 3906fe9
ecb_cbc_helpers.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _CRYPTO_ECB_CBC_HELPER_H
#define _CRYPTO_ECB_CBC_HELPER_H
#include <crypto/internal/skcipher.h>
#include <asm/fpu/api.h>
/*
* Mode helpers to instantiate parameterized skcipher ECB/CBC modes without
* having to rely on indirect calls and retpolines.
*/
#define ECB_WALK_START(req, bsize, fpu_blocks) do { \
void *ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req)); \
const int __bsize = (bsize); \
struct skcipher_walk walk; \
int err = skcipher_walk_virt(&walk, (req), false); \
while (walk.nbytes > 0) { \
unsigned int nbytes = walk.nbytes; \
bool do_fpu = (fpu_blocks) != -1 && \
nbytes >= (fpu_blocks) * __bsize; \
const u8 *src = walk.src.virt.addr; \
u8 *dst = walk.dst.virt.addr; \
u8 __maybe_unused buf[(bsize)]; \
if (do_fpu) kernel_fpu_begin()
#define CBC_WALK_START(req, bsize, fpu_blocks) \
ECB_WALK_START(req, bsize, fpu_blocks)
#define ECB_WALK_ADVANCE(blocks) do { \
dst += (blocks) * __bsize; \
src += (blocks) * __bsize; \
nbytes -= (blocks) * __bsize; \
} while (0)
#define ECB_BLOCK(blocks, func) do { \
while (nbytes >= (blocks) * __bsize) { \
(func)(ctx, dst, src); \
ECB_WALK_ADVANCE(blocks); \
} \
} while (0)
#define CBC_ENC_BLOCK(func) do { \
const u8 *__iv = walk.iv; \
while (nbytes >= __bsize) { \
crypto_xor_cpy(dst, src, __iv, __bsize); \
(func)(ctx, dst, dst); \
__iv = dst; \
ECB_WALK_ADVANCE(1); \
} \
memcpy(walk.iv, __iv, __bsize); \
} while (0)
#define CBC_DEC_BLOCK(blocks, func) do { \
while (nbytes >= (blocks) * __bsize) { \
const u8 *__iv = src + ((blocks) - 1) * __bsize; \
if (dst == src) \
__iv = memcpy(buf, __iv, __bsize); \
(func)(ctx, dst, src); \
crypto_xor(dst, walk.iv, __bsize); \
memcpy(walk.iv, __iv, __bsize); \
ECB_WALK_ADVANCE(blocks); \
} \
} while (0)
#define ECB_WALK_END() \
if (do_fpu) kernel_fpu_end(); \
err = skcipher_walk_done(&walk, nbytes); \
} \
return err; \
} while (0)
#define CBC_WALK_END() ECB_WALK_END()
#endif