Counter Strike : Global Offensive Source Code
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// gf256.cpp - written and placed in the public domain by Wei Dai
#include "pch.h"
#include "gf256.h"
NAMESPACE_BEGIN(CryptoPP)
GF256::Element GF256::Multiply(Element a, Element b) const{ word result = 0, t = b;
for (unsigned int i=0; i<8; i++) { result <<= 1; if (result & 0x100) result ^= m_modulus;
t <<= 1; if (t & 0x100) result ^= a; }
return (GF256::Element) result;}
GF256::Element GF256::MultiplicativeInverse(Element a) const{ Element result = a; for (int i=1; i<7; i++) result = Multiply(Square(result), a); return Square(result);}
NAMESPACE_END
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