From fd0ff5388c1fc2535f85243a46f609e2e62d9bb1 Mon Sep 17 00:00:00 2001
From: Sun Yimin <emmansun@users.noreply.github.com>
Date: Wed, 23 Feb 2022 11:21:38 +0800
Subject: [PATCH] =?UTF-8?q?Updated=20Armv8.2=20SM3=E5=92=8CSM4=20(markdown?=
 =?UTF-8?q?)?=
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---
 Armv8.2-SM3和SM4.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Armv8.2-SM3和SM4.md b/Armv8.2-SM3和SM4.md
index 17e2e5d..0ec831a 100644
--- a/Armv8.2-SM3和SM4.md
+++ b/Armv8.2-SM3和SM4.md
@@ -131,7 +131,7 @@ Vd[3] = P1(C XOR (R1 <<< 15)), 这里 C 是另外两个字的异或结果， R1
 SM3PARTW2中的tmp.value[0]就是R2
  P1(C XOR (R1 <<< 15)) XOR P1(R2 <<< 15) = P1(C XOR (R1 <<< 15) XOR (R2 <<< 15)) = P1(C XOR ((R1 XOR R2) <<< 15))
 ```
-所以，关键就是**循环位移对异或运算满足分配律成立**。
+所以，关键就是**循环位移对异或运算满足分配律成立**, 或者更一般的，**逻辑位移运算对异或运算满足分配律**， [Does a shift operation distribute over XOR](https://cs.stackexchange.com/questions/58264/does-a-shift-operation-distribute-over-xor/58266)。
 
 [模拟代码](https://gist.github.com/emmansun/c05b5e2262997ae546950f806fcd0146)