package ch.fhnw.kry;

import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.*;

class SPNTest {

    @Test
    void k() {
        var spn = new SPN();

        final int key = 0xFFFFFFFF;
        assertEquals(0xFFFF,  spn.k(key, 0));
        assertEquals(0xFFFF,  spn.k(key, 1));
        assertEquals(0xFFFF,  spn.k(key, 2));
    }

    @Test
    void substitution() {
        var spn = new SPN();

        //given
        int x = 0xEF45;
        int r = 0x051C;
        System.out.print(Integer.toHexString(x));

        //when
        int y = spn.substitution(x);

        // then
        assertEquals(r, y);

        // System.out.print(Integer.toHexString(spn.substitution(x)));
    }

    @Test
    void swapBits() {
        var spn = new SPN();

        // given 
        int x = 0xA;
        int r = 0xC;

        // when
        int y = spn.swapBits(x, 13, 14);
        int yy = spn.swapBits(x, 14, 13);
        int yyy = spn.swapBits(x, 14, 14);

        // then
        assertEquals(r, y);
        assertEquals(r, yy);
        assertEquals(x, yyy);
    }
}