Source code: mindbright/security/DES3.java
1 /******************************************************************************
2 *
3 * Copyright (c) 1998,99 by Mindbright Technology AB, Stockholm, Sweden.
4 * www.mindbright.se, info@mindbright.se
5 *
6 *****************************************************************************
7 * $Author: nallen $
8 * $Date: 2001/11/12 16:31:15 $
9 * $Name: $
10 *****************************************************************************/
11 /*
12 * !!! Author's comment: See DES.java for additional copyright-info on DES
13 */
14 package mindbright.security;
15
16 import java.math.BigInteger;
17
18 public final class DES3 extends Cipher {
19 DES des1 = new DES();
20 DES des2 = new DES();
21 DES des3 = new DES();
22
23 public synchronized void encrypt(byte[] src, int srcOff, byte[] dest, int destOff, int len) {
24 des1.encrypt(src, srcOff, dest, destOff, len);
25 des2.decrypt(dest, destOff, dest, destOff, len);
26 des3.encrypt(dest, destOff, dest, destOff, len);
27 }
28
29 public synchronized void decrypt(byte[] src, int srcOff, byte[] dest, int destOff, int len) {
30 des3.decrypt(src, srcOff, dest, destOff, len);
31 des2.encrypt(dest, destOff, dest, destOff, len);
32 des1.decrypt(dest, destOff, dest, destOff, len);
33 }
34
35 public void setKey(byte[] key) {
36 byte[] subKey = new byte[8];
37 des1.setKey(key);
38 System.arraycopy(key, 8, subKey, 0, 8);
39 des2.setKey(subKey);
40 System.arraycopy(key, 16, subKey, 0, 8);
41 des3.setKey(subKey);
42 }
43
44 /* !!! DEBUG
45 public static void main(String[] argv) {
46 byte[] key = {
47 (byte)0x12, (byte)0x34, (byte)0x56, (byte)0x78,
48 (byte)0x87, (byte)0x65, (byte)0x43, (byte)0x21,
49 (byte)0x44, (byte)0x55, (byte)0x66, (byte)0x77,
50 (byte)0x87, (byte)0x65, (byte)0x43, (byte)0x21,
51 (byte)0x87, (byte)0x65, (byte)0x43, (byte)0x21,
52 (byte)0x12, (byte)0x34, (byte)0x56, (byte)0x78,
53 };
54
55 byte[] txt = {
56 (byte)0x00, (byte)0x11, (byte)0x22, (byte)0x33,
57 (byte)0x44, (byte)0x55, (byte)0x66, (byte)0x77,
58 (byte)0x00, (byte)0x11, (byte)0x22, (byte)0x33,
59 (byte)0x44, (byte)0x55, (byte)0x66, (byte)0x77,
60 (byte)0x00, (byte)0x11, (byte)0x22, (byte)0x33,
61 (byte)0x44, (byte)0x55, (byte)0x66, (byte)0x77
62 };
63
64 byte[] enc;
65 byte[] dec;
66
67 System.out.println("key: " + printHex(key));
68 System.out.println("txt: " + printHex(txt));
69
70 DES3 cipher = new DES3();
71 cipher.setKey(key);
72
73 enc = cipher.encrypt(txt);
74 System.out.println("enc: " + printHex(enc));
75
76 cipher = new DES3();
77 cipher.setKey(key);
78
79 dec = cipher.decrypt(enc);
80
81 System.out.println("dec: " + printHex(dec));
82 }
83
84 static String printHex(byte[] buf) {
85 byte[] out = new byte[buf.length + 1];
86 out[0] = 0;
87 System.arraycopy(buf, 0, out, 1, buf.length);
88 BigInteger big = new BigInteger(out);
89 return big.toString(16);
90 }
91 static String printHex(int i) {
92 BigInteger b = BigInteger.valueOf((long)i + 0x100000000L);
93 BigInteger c = BigInteger.valueOf(0x100000000L);
94 if(b.compareTo(c) != -1)
95 b = b.subtract(c);
96 return b.toString(16);
97 }
98
99 */
100
101 }