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Updated SM3中的FF2和GG2函数 (markdown)

Sun Yimin 2023-09-25 10:20:33 +08:00
parent 513c49ecb5
commit 2311d983a4
1 changed files with 3 additions and 2 deletions
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SM3中的FF2和GG2函数.md

@ -4,8 +4,9 @@ $GG2(X, Y, Z) = (X \land Y) \lor (\lnot X \land Z)$
# 等价公式
$FF2(X, Y, Z) = (X \land Y) \bigoplus (X \land Z) \bigoplus (Y \land Z)$
$GG2(X, Y, Z) = (Y \bigoplus Z) \land X \bigoplus Z$
$GG2(X, Y, Z) = (Y \bigoplus Z) \land X \bigoplus Z$
GG2等价公式初次见于[Intel® Integrated Performance Primitives Cryptography](https://github.com/intel/ipp-crypto)
# 应用
特别是GG2，其等价公式相比原来的公式，因其简单，具有一点点性能优势（不明显），也可以省一个寄存器，还有就是ANDN指令属于[BMI1](https://en.wikipedia.org/wiki/X86_Bit_manipulation_instruction_set#BMI1_(Bit_Manipulation_Instruction_Set_1))，有些老机器不支持。