calculation.java

S-DES加、解密程序

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package s_des;

/**
 *
 * @author Administrator
 */
public class Calculation {
private int[][] S0;
    private int[][] S1;
    public int[] plain;
    public int[] IP;
    
    public int[] step1EP;
    public int[] step1XOR1;
    public int[] step1S;
    public int[] step1P4;
    public int[] step1XOR2;
    
    public int[] change;
    
    public int[] step2EP;
    public int[] step2XOR1;
    public int[] step2S;
    public int[] step2P4;
    public int[] step2XOR2;
    public int[] cipherText;
      
    Calculation(){
        plain = new int[8];
        IP = new int[8];
        
        step1EP = new int[8];
        step1XOR1 = new int[8];
        step1S = new int[4];
        step1P4 = new int[4];
        step1XOR2 = new int[4];
        change = new int[8];
        
        step2EP = new int[8];
        step2XOR1 = new int[8];
        step2S = new int[4];
        step2P4 = new int[4];
        step2XOR2 = new int[4];
        cipherText = new int[8];
                
        S0 = new int[4][4];        
        S0[0][0] = 1; S0[0][1] = 0; S0[0][2] = 3; S0[0][3] = 2;
        S0[1][0] = 3; S0[1][1] = 2; S0[1][2] = 1; S0[1][3] = 0;
        S0[2][0] = 0; S0[2][1] = 2; S0[2][2] = 1; S0[2][3] = 3;
        S0[3][0] = 3; S0[3][1] = 1; S0[3][2] = 3; S0[3][3] = 2;
        
        S1 = new int[4][4];
        S1[0][0] = 0; S1[0][1] = 1; S1[0][2] = 2; S1[0][3] = 3;
        S1[1][0] = 2; S1[1][1] = 0; S1[1][2] = 1; S1[1][3] = 3;
        S1[2][0] = 3; S1[2][1] = 0; S1[2][2] = 1; S1[2][3] = 0;
        S1[3][0] = 2; S1[3][1] = 1; S1[3][2] = 0; S1[3][3] = 3;        
    }
    
    public void calculateCipher(int[] inf,int[] K1,int[] K2){
        getInf(inf,plain);
        step1IP(plain,IP);
        step1EP(IP,step1EP);
        step1XOR1(step1EP,step1XOR1,K1);
        step1S(step1XOR1,step1S);
        step1P4(step1S,step1P4);
        step1XOR2(IP,step1P4,step1XOR2);
        step1Switch(IP,step1XOR2,change);
        
        step2EP(change,step2EP);
        step2XOR1(step2EP,step2XOR1,K2);
        step2S(step2XOR1,step2S);
        step2P4(step2S,step2P4);
        step2XOR2(change,step2P4,step2XOR2);
        step2IP(change,step2XOR2,cipherText);
        
        disPlay(plain);disPlay(IP);
        
        disPlay(step1EP);
        disPlay(step1XOR1);disPlay(step1S);disPlay(step1P4);
        disPlay(step1XOR2);disPlay(change);    
        
        disPlay(step2EP);        
        disPlay(step2XOR1);disPlay(step2S);disPlay(step2P4); 
        disPlay(step2XOR2);disPlay(cipherText);
    }
    public void calculatePlain(int[] inf,int[] K1,int[] K2){
        getInf(inf,cipherText);
        step1IP(cipherText,IP);
        
        step1EP(IP,step1EP);
        step1XOR1(step1EP,step1XOR1,K2);
        step1S(step1XOR1,step1S);
        step1P4(step1S,step1P4);
        step1XOR2(IP,step1P4,step1XOR2);
        
        step1Switch(IP,step1XOR2,change);
        
        step2EP(change,step2EP);
        step2XOR1(step2EP,step2XOR1,K1);
        step2S(step2XOR1,step2S);
        step2P4(step2S,step2P4);
        step2XOR2(change,step2P4,step2XOR2);
        
        step2IP(change,step2XOR2,plain);
        
        disPlay(plain);disPlay(IP);
        
        disPlay(step1EP);
        disPlay(step1XOR1);disPlay(step1S);disPlay(step1P4);
        disPlay(step1XOR2);disPlay(change);    
        
        disPlay(step2EP);        
        disPlay(step2XOR1);disPlay(step2S);disPlay(step2P4); 
        disPlay(step2XOR2);disPlay(cipherText);
    }
    private void getInf(int[] inf ,int[] vary){
        for(int i = 0; i < 8; i++)vary[i] = inf[i];
    }
    
    private void step1IP(int[] inf ,int[] vary){
        vary[0] = inf[1];
        vary[1] = inf[5];
        vary[2] = inf[2];
        vary[3] = inf[0];
        vary[4] = inf[3];
        vary[5] = inf[7];
        vary[6] = inf[4];
        vary[7] = inf[6];
    }
    private void step1EP(int[] inf, int[] vary){
        int[] temp = new int[4];
        for(int i = 0; i < 4; i++)temp[i] = inf[i + 4];
        vary[0] = temp[3];
        vary[1] = temp[0];
        vary[2] = temp[1];
        vary[3] = temp[2];
        vary[4] = temp[1];
        vary[5] = temp[2];
        vary[6] = temp[3];
        vary[7] = temp[0];
    }
    private void step1XOR1(int[] inf,int[] vary,int[] K1){
        for(int i = 0; i < 8; i++){
            if(inf[i] == K1[i])vary[i] = 0;
            else vary[i] = 1;
        }
    }
    private void step1S(int[] inf,int[] vary){
        int[] temp = new int[4];
        if(inf[0] == 0 && inf[3] == 0) temp[0] = 0;
        if(inf[0] == 0 && inf[3] == 1) temp[0] = 1;
        if(inf[0] == 1 && inf[3] == 0) temp[0] = 2;
        if(inf[0] == 1 && inf[3] == 1) temp[0] = 3;
        
        if(inf[1] == 0 && inf[2] == 0) temp[1] = 0;
        if(inf[1] == 0 && inf[2] == 1) temp[1] = 1;
        if(inf[1] == 1 && inf[2] == 0) temp[1] = 2;
        if(inf[1] == 1 && inf[2] == 1) temp[1] = 3;
        
        if(inf[4] == 0 && inf[7] == 0) temp[2] = 0;
        if(inf[4] == 0 && inf[7] == 1) temp[2] = 1;
        if(inf[4] == 1 && inf[7] == 0) temp[2] = 2;
        if(inf[4] == 1 && inf[7] == 1) temp[2] = 3;
       
        if(inf[5] == 0 && inf[6] == 0) temp[3] = 0;
        if(inf[5] == 0 && inf[6] == 1) temp[3] = 1;
        if(inf[5] == 1 && inf[6] == 0) temp[3] = 2;
        if(inf[5] == 1 && inf[6] == 1) temp[3] = 3;
        
        int[] temp1 = new int[2];
        temp1[0] = S0[temp[0]][temp[1]];
        temp1[1] = S1[temp[2]][temp[3]];
        
        if(temp1[0] == 0){
            vary[0] = 0;
            vary[1] = 0;
        }
        if(temp1[0] == 1){
            vary[0] = 0;
            vary[1] = 1;
        }
        if(temp1[0] == 2){
            vary[0] = 1;
            vary[1] = 0;
        }
        if(temp1[0] == 3){
            vary[0] = 1;
            vary[1] = 1;
        }
        if(temp1[1] == 0){
            vary[2] = 0;
            vary[3] = 0;
        }
        if(temp1[1] == 1){
            vary[2] = 0;
            vary[3] = 1;
        }
        if(temp1[1] == 2){
            vary[2] = 1;
            vary[3] = 0;
        }
        if(temp1[1] == 3){
            vary[2] = 1;
            vary[3] = 1;
        }         
    }
    private void step1P4(int[] inf,int[] vary){
        vary[0] = inf[1];
        vary[1] = inf[3];
        vary[2] = inf[2];
        vary[3] = inf[0];
    }
    private void step1XOR2(int[] inf1,int[] inf2,int[] vary){
        for(int i = 0; i < 4; i++){
            if(inf1[i] == inf2[i])vary[i] = 0;
            else vary[i] = 1;
        }
    }
    private void step1Switch(int[] inf1,int[] inf2,int[] vary){
        for(int i = 0; i < 4; i++){
            vary[i] = inf1[i+4];
            vary[i+4] = inf2[i];
        }
    }
    //step2
    private void step2EP(int[] inf,int[] vary){
        int[] temp = new int[4];
        for(int i = 0; i < 4; i++)temp[i] = inf[i + 4];
        vary[0] = temp[3];
        vary[1] = temp[0];
        vary[2] = temp[1];
        vary[3] = temp[2];
        vary[4] = temp[1];
        vary[5] = temp[2];
        vary[6] = temp[3];
        vary[7] = temp[0];
    }
    
    private void step2XOR1(int[] inf1,int[] vary,int[] K2){
        for(int i = 0; i < 8; i++){
            if(inf1[i] == K2[i])vary[i] = 0;
            else vary[i] = 1;
        }
    }
    
    private void step2S(int[] inf,int[] vary){
        int[] temp = new int[4];
        if(inf[0] == 0 && inf[3] == 0) temp[0] = 0;
        if(inf[0] == 0 && inf[3] == 1) temp[0] = 1;
        if(inf[0] == 1 && inf[3] == 0) temp[0] = 2;
        if(inf[0] == 1 && inf[3] == 1) temp[0] = 3;
        
        if(inf[1] == 0 && inf[2] == 0) temp[1] = 0;
        if(inf[1] == 0 && inf[2] == 1) temp[1] = 1;
        if(inf[1] == 1 && inf[2] == 0) temp[1] = 2;
        if(inf[1] == 1 && inf[2] == 1) temp[1] = 3;
        
        if(inf[4] == 0 && inf[7] == 0) temp[2] = 0;
        if(inf[4] == 0 && inf[7] == 1) temp[2] = 1;
        if(inf[4] == 1 && inf[7] == 0) temp[2] = 2;
        if(inf[4] == 1 && inf[7] == 1) temp[2] = 3;
       
        if(inf[5] == 0 && inf[6] == 0) temp[3] = 0;
        if(inf[5] == 0 && inf[6] == 1) temp[3] = 1;
        if(inf[5] == 1 && inf[6] == 0) temp[3] = 2;
        if(inf[5] == 1 && inf[6] == 1) temp[3] = 3;
        
        int[] temp1 = new int[2];
        temp1[0] = S0[temp[0]][temp[1]];
        temp1[1] = S1[temp[2]][temp[3]];
        
        if(temp1[0] == 0){
            vary[0] = 0;
            vary[1] = 0;
        }
        if(temp1[0] == 1){
            vary[0] = 0;
            vary[1] = 1;
        }
        if(temp1[0] == 2){
            vary[0] = 1;
            vary[1] = 0;
        }
        if(temp1[0] == 3){
            vary[0] = 1;
            vary[1] = 1;
        }
        if(temp1[1] == 0){
            vary[2] = 0;
            vary[3] = 0;
        }
        if(temp1[1] == 1){
            vary[2] = 0;
            vary[3] = 1;
        }
        if(temp1[1] == 2){
            vary[2] = 1;
            vary[3] = 0;
        }
        if(temp1[1] == 3){
            vary[2] = 1;
            vary[3] = 1;
        }         
    }
    
    private void step2P4(int[] inf,int[] vary){
        vary[0] = inf[1];
        vary[1] = inf[3];
        vary[2] = inf[2];
        vary[3] = inf[0];
    }
    
    private void step2XOR2(int[] inf1,int[] inf2,int[] vary){
        for(int i = 0; i < 4; i++){
            if(inf1[i] == inf2[i])vary[i] = 0;
            else vary[i] = 1;
        }
    }
    private void step2IP(int[] inf1,int[] inf2,int[] vary){
        int[] temp = new int[8];
        for(int i = 0; i < 4;i++){
            temp[i + 4] = inf1[i + 4];
            temp[i] = inf2[i];
        }
        vary[0] = temp[3];
        vary[1] = temp[0];
        vary[2] = temp[2];
        vary[3] = temp[4];
        vary[4] = temp[6];
        vary[5] = temp[1];
        vary[6] = temp[7];
        vary[7] = temp[5];
    }
    private void disPlay(int[] inf){
        for(int i = 0;i < inf.length;i++){
            System.out.print(" " + inf[i]);
        }
        System.out.println();
    }
}