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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /arch/x86/crypto/ecb_cbc_helpers.h | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/x86/crypto/ecb_cbc_helpers.h')
-rw-r--r-- | arch/x86/crypto/ecb_cbc_helpers.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/arch/x86/crypto/ecb_cbc_helpers.h b/arch/x86/crypto/ecb_cbc_helpers.h new file mode 100644 index 0000000000..11955bd01a --- /dev/null +++ b/arch/x86/crypto/ecb_cbc_helpers.h @@ -0,0 +1,87 @@ +/* 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 __fpu_blocks = (fpu_blocks); \ + 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 { \ + const int __blocks = (blocks); \ + if (do_fpu && __blocks < __fpu_blocks) { \ + kernel_fpu_end(); \ + do_fpu = false; \ + } \ + 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 { \ + const int __blocks = (blocks); \ + if (do_fpu && __blocks < __fpu_blocks) { \ + kernel_fpu_end(); \ + do_fpu = false; \ + } \ + 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 |