1 /**
2 * Copyright Santeri Paavolainen <sjpaavol@cc.helsinki.fi> and Timothy W Macinta
3 * (twm@alum.mit.edu) (optimizations and bug fixes) and individual contributors
4 * by the @author tags. See the COPYRIGHT.txt in the distribution for a full
5 * listing of individual contributors.
6 *
7 * This is free software; you can redistribute it and/or modify it under the
8 * terms of the GNU Lesser General Public License as published by the Free
9 * Software Foundation; either version 2.1 of the License, or (at your option)
10 * any later version.
11 *
12 * This software is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
15 * details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this software; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA, or see the FSF
20 * site: http://www.fsf.org.
21 */
22 package goldengate.common.digest;
23
24 /**
25 * Fast implementation of RSA's MD5 hash generator in Java JDK Beta-2 or higher<br>
26 * Originally written by Santeri Paavolainen, Helsinki Finland 1996 <br>
27 * (c) Santeri Paavolainen, Helsinki Finland 1996 <br>
28 * Some changes Copyright (c) 2002 Timothy W Macinta <br>
29 * <p>
30 * This library is free software; you can redistribute it and/or modify it under
31 * the terms of the GNU Library General Public License as published by the Free
32 * Software Foundation; either version 2.1 of the License, or (at your option)
33 * any later version.
34 * <p>
35 * This library is distributed in the hope that it will be useful, but WITHOUT
36 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
37 * FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more
38 * details.
39 * <p>
40 * You should have received a copy of the GNU Library General Public License
41 * along with this library; if not, write to the Free Software Foundation, Inc.,
42 * 675 Mass Ave, Cambridge, MA 02139, USA.
43 * <p>
44 * See http://www.twmacinta.com/myjava/fast_md5.php for more information on this
45 * file.
46 * <p>
47 * Contains internal state of the MD5 class
48 * <p>
49 * Please note: I (Timothy Macinta) have put this code in the com.twmacinta.util
50 * package only because it came without a package. I was not the the original
51 * author of the code, although I did optimize it (substantially) and fix some
52 * bugs.
53 *
54 * @author Santeri Paavolainen <sjpaavol@cc.helsinki.fi>
55 * @author Timothy W Macinta (twm@alum.mit.edu) (optimizations and bug fixes)
56 **/
57
58 class MD5State {
59 /**
60 * 128-bit state
61 */
62 protected int state[];
63
64 /**
65 * 64-bit character count
66 */
67 protected long count;
68
69 /**
70 * 64-byte buffer (512 bits) for storing to-be-hashed characters
71 */
72 protected byte buffer[];
73
74 /**
75 * Constructor
76 *
77 */
78 public MD5State() {
79 buffer = new byte[64];
80 count = 0;
81 state = new int[4];
82
83 state[0] = 0x67452301;
84 state[1] = 0xefcdab89;
85 state[2] = 0x98badcfe;
86 state[3] = 0x10325476;
87
88 }
89
90 /**
91 * Create this State as a copy of another state
92 *
93 * @param from
94 */
95 public MD5State(MD5State from) {
96 this();
97
98 int i;
99
100 for (i = 0; i < buffer.length; i ++) {
101 buffer[i] = from.buffer[i];
102 }
103
104 for (i = 0; i < state.length; i ++) {
105 state[i] = from.state[i];
106 }
107
108 count = from.count;
109 }
110 }