|
// 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
|
By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.
If a file you wish to view isn't highlighted, and is a text file (not binary), please
let us know and we'll add colourisation support for it.
System developer from Argentina.
Programmed in VB 5,6,.NET, C#, Java, PL-SQL, Transac-SQL, C, C++ and even some "calculator" language.
Love to build small, useful applications.
Usually building big and complicated apps based on solid, reliable components.
Hobbies: reading, photography, chess, paddle, running.