1 /********************************************************************************
2 *InternetCafe is a software solution that helps the management of Cybercafes
3 * according with the ITALIAN DECREE LAW ON ANTI-TERROR MEASURES, 27 JULY 2005.
4 * Copyright (C) 2006 Guido Angelo Ingenito
5
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 *******************************************************************************/
20 package base.jdbs.cryptography.symmetric;
21
22 import java.io.File;
23 import java.io.FileInputStream;
24 import java.io.FileOutputStream;
25 import java.security.spec.AlgorithmParameterSpec;
26 import java.security.spec.KeySpec;
27
28 import javax.crypto.Cipher;
29 import javax.crypto.CipherInputStream;
30 import javax.crypto.SecretKey;
31 import javax.crypto.SecretKeyFactory;
32 import javax.crypto.spec.PBEKeySpec;
33 import javax.crypto.spec.PBEParameterSpec;
34
35 import org.apache.log4j.Logger;
36
37 public class DESSymmetricCipher extends SymmetricCipher{
38
39 private static final transient Logger logger = Logger.getLogger(DESSymmetricCipher.class.getName());
40
41 /***The 8-byte salt to use to instantiate ciphers.**/
42 byte[] salt = {
43 (byte)0xA9, (byte)0x9B, (byte)0xC8, (byte)0x32,
44 (byte)0x56, (byte)0x35, (byte)0xE3, (byte)0x03
45 };
46
47 /***The number of iteration to use in DES**/
48 int iterationCount = 19;
49
50 public DESSymmetricCipher(SymmetricKey passPhrase){
51 try {
52
53 KeySpec keySpec = new PBEKeySpec(passPhrase.getValue().toCharArray(), salt, iterationCount);
54 SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec);
55 encryptionCipher = Cipher.getInstance(key.getAlgorithm());
56 decryptionCipher = Cipher.getInstance(key.getAlgorithm());
57
58
59 AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);
60
61
62 encryptionCipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
63 decryptionCipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
64 } catch (Exception ex) {
65 logger.error(ex.getMessage());
66 ex.printStackTrace();
67 }
68 }
69
70 public void encrypt(File inputFile, File outputFile){
71 try {
72
73 CipherInputStream inputStream = new CipherInputStream(new FileInputStream(inputFile), encryptionCipher);
74 FileOutputStream outputStream = new FileOutputStream(outputFile);
75 byte[] buffer = new byte[1024];
76
77 int numRead = 0;
78 while ((numRead = inputStream.read(buffer)) >= 0) {
79 outputStream.write(buffer, 0, numRead);
80 }
81 inputStream.close();
82 outputStream.close();
83 } catch (java.io.IOException ex) {
84 logger.error(ex.getMessage());
85 ex.printStackTrace();
86 }
87 }
88
89 public void decrypt(File inputFile, File outputFile){
90 try {
91
92 CipherInputStream inputStream = new CipherInputStream(new FileInputStream(inputFile), decryptionCipher);
93 FileOutputStream outputStream = new FileOutputStream(outputFile);
94 byte[] buffer = new byte[1024];
95
96 int numRead = 0;
97 while ((numRead = inputStream.read(buffer)) >= 0) {
98 outputStream.write(buffer, 0, numRead);
99 }
100 inputStream.close();
101 outputStream.close();
102 } catch (java.io.IOException ex) {
103 logger.error(ex.getMessage());
104 ex.printStackTrace();
105 }
106 }
107 }