shift_row
q[0] = shift_row(q[0]);
q[1] = shift_row(q[1]);
q[2] = shift_row(q[2]);
q[3] = shift_row(q[3]);
q[4] = shift_row(q[4]);
q[5] = shift_row(q[5]);
q[6] = shift_row(q[6]);
q[7] = shift_row(q[7]);