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Updated Armv8.2 SM3和SM4 (markdown)

Sun Yimin 2022-02-23 11:21:38 +08:00
parent 814bd2002c
commit fd0ff5388c
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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 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)) 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) [模拟代码](https://gist.github.com/emmansun/c05b5e2262997ae546950f806fcd0146)