jRxB8Ehk

1package javaapplication8;
2
3import java.security.*;
4import java.util.Arrays;
5import javax.crypto.*;
6
7public class JavaApplication8 {
8
9    
10    public static void main(String[] args) 
11        throws Exception
12                {
13                    Provider[] p =Security.getProviders();
14                    
15                    for (Provider x: p)
16                    {
17 
18                        System.out.println("Name: " + x.getName());
19                        System.out.println("Info:" + x.getInfo());
20                    // getInfo
21                    
22                    }
23    
24    KeyPairGenerator kpg = KeyPairGenerator.getInstance( "RSA");
25KeyPair kp = kpg.generateKeyPair();
26
27///Keygenerator kg = KeyGenerator.getInstance("DES");
28//SecretKey = kg.generateKey();
29
30
31
32Cipher c = Cipher.getInstance( "RSA");
33c.init( Cipher.ENCRYPT_MODE, kp.getPublic()); 
34
35String s = "ahoj";
36
37byte[] b = s.getBytes( "UTF-8");
38
39byte[] zasifrovano = c.doFinal( b);
40
41  System.out.println( Arrays.toString(b));
42  System.out.println(  Arrays.toString ( zasifrovano));
43               
44    
45    Cipher d = Cipher.getInstance( "RSA");
46    d.init( Cipher.DECRYPT_MODE, kp.getPrivate()); 
47    
48
49
50byte[] rozsifrovano = d.doFinal( zasifrovano);
51String xxx = Arrays.toString ( rozsifrovano);
52}
53}