INNER CODE UNIT · C++

res

ph4r05/Whitebox-crypto-AES · BGEAttack.cpp:625

		mat_GF2 res    = AtildMatInv * xMat;
		GF2X    resGF  = colVector_GF2X(res, 0);
		AtildInvLoT[x] = getLong(resGF);
	}

	//
	// Construct those mappings y_row. This can be similar to prop1, but
	// here we are iterating over 2 variables and CHECKING if resulting mapping is affine.
	//
	int PiOK=0;
	for(int p=0; p<4; p++){
		GF256_func_t y_row;                         // pre-computed functions
		W128b state;
		for(int x=0; x<=0xff; x++){
			memset(&state, 0, sizeof(state));		// put 0 everywhere
			state.B[col + 4*p] = x;                 // In each iteration P_i, we set X to different position, namely x0,x1,x2,x3

			this->Rbox(state, true, r, true);		// perform R box computation on input & output values

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