Source code: gnu/javax/crypto/key/IKeyAgreementParty.java
1 /* IKeyAgreementParty.java --
2 Copyright (C) 2003, 2006 Free Software Foundation, Inc.
3
4 This file is a part of GNU Classpath.
5
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or (at
9 your option) any later version.
10
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
19 USA
20
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
25
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
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30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
37
38
39 package gnu.javax.crypto.key;
40
41 import java.util.Map;
42
43 /**
44 * <p>The visible methods of an key agreement protocol participating party.</p>
45 */
46 public interface IKeyAgreementParty
47 {
48
49 // Constants
50 // -------------------------------------------------------------------------
51
52 // Methods
53 // -------------------------------------------------------------------------
54
55 /**
56 * <p>Returns the canonical name of the key agreement protocol.</p>
57 *
58 * @return the canonical name of the key agreement protocol.
59 */
60 String name();
61
62 /**
63 * <p>Sets up the instance to operate with specific attributes.</p>
64 *
65 * @param attributes a map of name-values used by concrete implementations.
66 * @throws KeyAgreementException if an exception occurs during the setup.
67 */
68 void init(Map attributes) throws KeyAgreementException;
69
70 /**
71 * <p>Processes an incoming message at one end, generating a message that
72 * will be processed by the other party(ies).</p>
73 *
74 * @param in the incoming message.
75 * @return an outgoing message, or <code>null</code> if this is an
76 * intermediary step that does not cause any output.
77 * @throws KeyAgreementException if an exception occurs during the processing
78 * of the incoming message, or during the generation of the outgoing message.
79 */
80 OutgoingMessage processMessage(IncomingMessage in)
81 throws KeyAgreementException;
82
83 /**
84 * <p>Returns <code>true</code> if the party in the key agreement protocol
85 * exchange has completed its part of the exchange. If this is the case an
86 * {@link IllegalStateException} is thrown for any method invocation except
87 * <code>init()</code> or <code>reset()</code>.
88 * @return <code>true</code> if this party has completed its part of the key
89 * agreement protocol exchange; <code>false</code> otherwise.
90 */
91 boolean isComplete();
92
93 /**
94 * <p>Returns the byte array containing the shared secret as generated by
95 * this party.</p>
96 *
97 * @return the generated shared secret.
98 * @throws KeyAgreementException if the key agreement is not yet initialised,
99 * or is initialised but the exchange is still in progress.
100 */
101 byte[] getSharedSecret() throws KeyAgreementException;
102
103 /** Resets this instance for re-use with another set of attributes. */
104 void reset();
105 }