password encryption and decryption in java

1import java.security.spec.KeySpec;
2import javax.crypto.Cipher;
3import javax.crypto.SecretKey;
4import javax.crypto.SecretKeyFactory;
5import javax.crypto.spec.DESedeKeySpec;
6import org.apache.commons.codec.binary.Base64;
7
8public class TrippleDes {
9
10    private static final String UNICODE_FORMAT = "UTF8";
11    public static final String DESEDE_ENCRYPTION_SCHEME = "DESede";
12    private KeySpec ks;
13    private SecretKeyFactory skf;
14    private Cipher cipher;
15    byte[] arrayBytes;
16    private String myEncryptionKey;
17    private String myEncryptionScheme;
18    SecretKey key;
19
20    public TrippleDes() throws Exception {
21        myEncryptionKey = "ThisIsSpartaThisIsSparta";
22        myEncryptionScheme = DESEDE_ENCRYPTION_SCHEME;
23        arrayBytes = myEncryptionKey.getBytes(UNICODE_FORMAT);
24        ks = new DESedeKeySpec(arrayBytes);
25        skf = SecretKeyFactory.getInstance(myEncryptionScheme);
26        cipher = Cipher.getInstance(myEncryptionScheme);
27        key = skf.generateSecret(ks);
28    }
29
30
31    public String encrypt(String unencryptedString) {
32        String encryptedString = null;
33        try {
34            cipher.init(Cipher.ENCRYPT_MODE, key);
35            byte[] plainText = unencryptedString.getBytes(UNICODE_FORMAT);
36            byte[] encryptedText = cipher.doFinal(plainText);
37            encryptedString = new String(Base64.encodeBase64(encryptedText));
38        } catch (Exception e) {
39            e.printStackTrace();
40        }
41        return encryptedString;
42    }
43
44
45    public String decrypt(String encryptedString) {
46        String decryptedText=null;
47        try {
48            cipher.init(Cipher.DECRYPT_MODE, key);
49            byte[] encryptedText = Base64.decodeBase64(encryptedString);
50            byte[] plainText = cipher.doFinal(encryptedText);
51            decryptedText= new String(plainText);
52        } catch (Exception e) {
53            e.printStackTrace();
54        }
55        return decryptedText;
56    }
57
58
59    public static void main(String args []) throws Exception
60    {
61        TrippleDes td= new TrippleDes();
62
63        String target="imparator";
64        String encrypted=td.encrypt(target);
65        String decrypted=td.decrypt(encrypted);
66
67        System.out.println("String To Encrypt: "+ target);
68        System.out.println("Encrypted String:" + encrypted);
69        System.out.println("Decrypted String:" + decrypted);
70
71    }
72
73}
74

1package com.javapapers.java.security;
2
3import java.io.FileInputStream;
4import java.io.FileOutputStream;
5import java.util.Random;
6
7import javax.crypto.Cipher;
8import javax.crypto.SecretKey;
9import javax.crypto.SecretKeyFactory;
10import javax.crypto.spec.PBEKeySpec;
11import javax.crypto.spec.PBEParameterSpec;
12
13public class FileEncryption {
14
15	public static void main(String[] args) throws Exception {
16
17		FileInputStream inFile = new FileInputStream("plainfile.txt");
18		FileOutputStream outFile = new FileOutputStream("plainfile.des");
19
20		String password = "javapapers";
21		PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray());
22		SecretKeyFactory secretKeyFactory = SecretKeyFactory
23				.getInstance("PBEWithMD5AndTripleDES");
24		SecretKey secretKey = secretKeyFactory.generateSecret(pbeKeySpec);
25
26		byte[] salt = new byte[8];
27		Random random = new Random();
28		random.nextBytes(salt);
29
30		PBEParameterSpec pbeParameterSpec = new PBEParameterSpec(salt, 100);
31		Cipher cipher = Cipher.getInstance("PBEWithMD5AndTripleDES");
32		cipher.init(Cipher.ENCRYPT_MODE, secretKey, pbeParameterSpec);
33		outFile.write(salt);
34
35		byte[] input = new byte[64];
36		int bytesRead;
37		while ((bytesRead = inFile.read(input)) != -1) {
38			byte[] output = cipher.update(input, 0, bytesRead);
39			if (output != null)
40				outFile.write(output);
41		}
42
43		byte[] output = cipher.doFinal();
44		if (output != null)
45			outFile.write(output);
46
47		inFile.close();
48		outFile.flush();
49		outFile.close();
50	}
51
52}