01: package com.quadcap.crypto;
02:
03: /* Copyright 2002 - 2003 Quadcap Software. All rights reserved.
04: *
05: * This software is distributed under the Quadcap Free Software License.
06: * This software may be used or modified for any purpose, personal or
07: * commercial. Open Source redistributions are permitted. Commercial
08: * redistribution of larger works derived from, or works which bundle
09: * this software requires a "Commercial Redistribution License"; see
10: * http://www.quadcap.com/purchase.
11: *
12: * Redistributions qualify as "Open Source" under one of the following terms:
13: *
14: * Redistributions are made at no charge beyond the reasonable cost of
15: * materials and delivery.
16: *
17: * Redistributions are accompanied by a copy of the Source Code or by an
18: * irrevocable offer to provide a copy of the Source Code for up to three
19: * years at the cost of materials and delivery. Such redistributions
20: * must allow further use, modification, and redistribution of the Source
21: * Code under substantially the same terms as this license.
22: *
23: * Redistributions of source code must retain the copyright notices as they
24: * appear in each source code file, these license terms, and the
25: * disclaimer/limitation of liability set forth as paragraph 6 below.
26: *
27: * Redistributions in binary form must reproduce this Copyright Notice,
28: * these license terms, and the disclaimer/limitation of liability set
29: * forth as paragraph 6 below, in the documentation and/or other materials
30: * provided with the distribution.
31: *
32: * The Software is provided on an "AS IS" basis. No warranty is
33: * provided that the Software is free of defects, or fit for a
34: * particular purpose.
35: *
36: * Limitation of Liability. Quadcap Software shall not be liable
37: * for any damages suffered by the Licensee or any third party resulting
38: * from use of the Software.
39: */
40:
41: import java.util.Random;
42: import java.math.BigInteger;
43: import java.nio.ByteBuffer;
44:
45: import com.quadcap.util.text.Text;
46:
47: /**
48: * RSA Public key implementation
49: *
50: * @author Stan Bailes
51: */
52: public class RSAPublicKey extends RSAKey implements PublicKey {
53: /**
54: * Default constructor
55: */
56: public RSAPublicKey() {
57: }
58:
59: /**
60: * Construct from simple text representation
61: */
62: public void init(String rep) {
63: String[] s = Text.extractN(rep, "*:*:*");
64: super .init(s[3], Integer.parseInt(s[1]), new BigInteger(s[2]));
65: }
66:
67: /**
68: * Convert to simple text representation
69: */
70: public String toString() {
71: return "RSAPub:" + size + ":" + n + ":" + text;
72: }
73:
74: /**
75: * Return the textual identifier associated with this key
76: */
77: public String getText() {
78: return text;
79: }
80:
81: /**
82: * Encrypt a buffer
83: */
84: public void f(ByteBuffer plain, ByteBuffer encrypted) {
85: engine(plain, encrypted);
86: }
87:
88: /**
89: * A single encryption operation for m < n
90: */
91: public BigInteger engine(BigInteger m) {
92: return m.modPow(e, n);
93: }
94: }
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