chi.c

Go to the documentation of this file.

#include "Keccak.h"

void chi(UINT64 *A)
{
    unsigned int x, y;
    UINT64 C[5];

    for(y=0; y<5; y++) { 
        for(x=0; x<5; x++)
            C[x] = A[index(x, y)] ^ ((~A[index(x+1, y)]) & A[index(x+2, y)]);
        for(x=0; x<5; x++)
            A[index(x, y)] = C[x];
    }
}