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1import java.security.KeyFactory;
2import java.security.KeyPair;
3import java.security.KeyPairGenerator;
4import java.security.NoSuchAlgorithmException;
5import java.security.spec.DSAPrivateKeySpec;
6import java.security.spec.InvalidKeySpecException;
7
8import javax.crypto.KeyGenerator;
9import javax.crypto.SecretKey;
10import javax.crypto.SecretKeyFactory;
11import javax.crypto.spec.DESKeySpec;
12
13public class KeyTest {
14
15    public static void main(String[] args) {
16        try {
17            generateKeyPair();
18            generateKey();
19        } catch (InvalidKeySpecException e) {
20            e.printStackTrace();
21        } catch (NoSuchAlgorithmException e) {
22            e.printStackTrace();
23        }
24    }
25
26    public static void generateKeyPair() throws NoSuchAlgorithmException, InvalidKeySpecException {
27        KeyPairGenerator kpg = KeyPairGenerator.getInstance("DSA");
28        kpg.initialize(512);
29        KeyPair kp = kpg.generateKeyPair();
30        System.out.println(kpg.getProvider());
31        System.out.println(kpg.getAlgorithm());
32        KeyFactory kf = KeyFactory.getInstance("DSA");
33        DSAPrivateKeySpec dsaPKS = kf.getKeySpec(kp.getPrivate(), DSAPrivateKeySpec.class);
34        System.out.println("\tDSA param G:" + dsaPKS.getG());
35        System.out.println("\tDSA param P:" + dsaPKS.getP());
36        System.out.println("\tDSA param Q:" + dsaPKS.getQ());
37        System.out.println("\tDSA param X:" + dsaPKS.getX());
38    }
39
40    public static void generateKey() throws NoSuchAlgorithmException, InvalidKeySpecException {
41        KeyGenerator kg = KeyGenerator.getInstance("DES");
42        SecretKey key = kg.generateKey();
43        System.out.println(kg.getProvider());
44        System.out.println(kg.getAlgorithm());
45        SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
46        DESKeySpec desKS = (DESKeySpec) skf.getKeySpec(key, DESKeySpec.class);
47        System.out.println("\tDES key bytes size:" + desKS.getKey().length);
48    }
49
50}