yzCP2NvB

1
2///// BOB 
3KeyAgreement bobKeyAgree;
4PublicKey alicePubKey;
5SecretKey bobDesKey;
6Cipher bobCipher;
7
8void BTNKHOAACTION(){
9    try{
10        FileInputStream fis = new FileInputStream("D:/A.pub");
11        byte[] akeyP = new byte[fis.available()];
12        fis.read(akeyP);
13        fis.close();
14        txtKhoaA.setText(akeyP.toString());
15
16    }
17    catch(Exception ex){
18
19    }
20}
21
22
23void btnKhoaBAction(){
24    try{
25        boolean read = false;
26    while (!read){
27        try{
28            FileInputStream fis = new FileInputStream("D:/A.pub");
29            fis.close();
30            read = true;
31        }
32        catch(Exception ex){
33            
34        }
35    }
36    FileInputStream fis = new FileInputStream("D:/A.pub");
37    byte[] alicePubKeyEnc = new byte[fis.avaiable()];
38    fis.read(alicePubKeyEnc);
39    fis.close();
40    KeyFactory bobKeyFac = KeyFactory.getInstance("DH");
41    X509EncodedKeySpec x509KeySpec =  new X509EncodedKeySpec(alicePubKeyEnc);
42    alicePubKey = bobKeyFac.generatePublic(x509KeySpec);
43    DHParameterSpec dhParamSpec = ((DHPublicKey)alicePubKey).getParams();
44    System.out.println("Generate DH keypair");
45    KeyPairGenerator bobKpairGen = KeyPairGenerator.getInstance("DH");
46    bobKpairGen.initialize(dhParamSpec);
47    KeyPair bobKpair = bobKpairGen.generateKeyPair();
48    System.out.println("Initializing KeyAgreement engine...");
49    bobKeyAgree = KeyAgreement.getInstance("DH");
50    bobKeyAgree.init(bobKpair.getPrivate());
51    byte[] bobPubKeyEnc = bobKpair.getPublic().getEncoded();
52    FileOutputStream fos = new FileOutputStream("D:/B.pub");
53    fos.write(bobPubKeyEnc);
54    fos.close();
55    txtkhoaB.setText(bobPubKeyEnc.toString());
56
57    }
58    catch(Exception ex){
59
60    }
61
62}
63void btnKhoaACtion(){
64    try{
65        bobKeyAgree.doPhase(alicePubKey, true);
66        byte[] bobShareSecret = bobKeyAgree.generateSecret();
67        System.out.println("Khoa chung : Shared secret (DEBUG ONLY : " + CryptoUtil.toGexString(bobShareSecret));
68        txtKhoaChung.setText(CryptoUtil.toHexString(bobSharedSecret));
69    }catch(Exception ex){
70
71    }
72}
73void btnMaKhoa(){
74    try{
75        bobKeyAgree.doPhase(alicePubKey, true);
76        bobDesKey = bobKeyAgree.generateSecret("DES");
77        txtMaHoaKAB.setText(bobDesKey.toString());
78        BufferedWriter bw = null;
79        String fileName = "D:\\KhoaB.txt";
80        bw = new BufferedWriter(new FileWriter(fileName));
81        bw.write(bobDesKey.toString());
82        bw.close();
83    }
84    catch(Exception ex){
85        
86    }
87}