mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 17:36:41 +07:00
b913a6404c
This patches modifies the GHASH secure hash implementation to switch to a faster, polynomial multiplication based reduction instead of one that uses shifts and rotates. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
80 lines
1.8 KiB
ArmAsm
80 lines
1.8 KiB
ArmAsm
/*
|
|
* Accelerated GHASH implementation with ARMv8 PMULL instructions.
|
|
*
|
|
* Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published
|
|
* by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
|
|
SHASH .req v0
|
|
SHASH2 .req v1
|
|
T1 .req v2
|
|
T2 .req v3
|
|
MASK .req v4
|
|
XL .req v5
|
|
XM .req v6
|
|
XH .req v7
|
|
IN1 .req v7
|
|
|
|
.text
|
|
.arch armv8-a+crypto
|
|
|
|
/*
|
|
* void pmull_ghash_update(int blocks, u64 dg[], const char *src,
|
|
* struct ghash_key const *k, const char *head)
|
|
*/
|
|
ENTRY(pmull_ghash_update)
|
|
ld1 {SHASH.16b}, [x3]
|
|
ld1 {XL.16b}, [x1]
|
|
movi MASK.16b, #0xe1
|
|
ext SHASH2.16b, SHASH.16b, SHASH.16b, #8
|
|
shl MASK.2d, MASK.2d, #57
|
|
eor SHASH2.16b, SHASH2.16b, SHASH.16b
|
|
|
|
/* do the head block first, if supplied */
|
|
cbz x4, 0f
|
|
ld1 {T1.2d}, [x4]
|
|
b 1f
|
|
|
|
0: ld1 {T1.2d}, [x2], #16
|
|
sub w0, w0, #1
|
|
|
|
1: /* multiply XL by SHASH in GF(2^128) */
|
|
CPU_LE( rev64 T1.16b, T1.16b )
|
|
|
|
ext T2.16b, XL.16b, XL.16b, #8
|
|
ext IN1.16b, T1.16b, T1.16b, #8
|
|
eor T1.16b, T1.16b, T2.16b
|
|
eor XL.16b, XL.16b, IN1.16b
|
|
|
|
pmull2 XH.1q, SHASH.2d, XL.2d // a1 * b1
|
|
eor T1.16b, T1.16b, XL.16b
|
|
pmull XL.1q, SHASH.1d, XL.1d // a0 * b0
|
|
pmull XM.1q, SHASH2.1d, T1.1d // (a1 + a0)(b1 + b0)
|
|
|
|
ext T1.16b, XL.16b, XH.16b, #8
|
|
eor T2.16b, XL.16b, XH.16b
|
|
eor XM.16b, XM.16b, T1.16b
|
|
eor XM.16b, XM.16b, T2.16b
|
|
pmull T2.1q, XL.1d, MASK.1d
|
|
|
|
mov XH.d[0], XM.d[1]
|
|
mov XM.d[1], XL.d[0]
|
|
|
|
eor XL.16b, XM.16b, T2.16b
|
|
ext T2.16b, XL.16b, XL.16b, #8
|
|
pmull XL.1q, XL.1d, MASK.1d
|
|
eor T2.16b, T2.16b, XH.16b
|
|
eor XL.16b, XL.16b, T2.16b
|
|
|
|
cbnz w0, 0b
|
|
|
|
st1 {XL.16b}, [x1]
|
|
ret
|
|
ENDPROC(pmull_ghash_update)
|