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Java > Open Source Codes > org > jboss > crypto > digest > DigestCallback


1 /*
2 * JBoss, the OpenSource J2EE webOS
3 *
4 * Distributable under LGPL license.
5 * See terms of license at gnu.org.
6 */
7 package org.jboss.crypto.digest;
8
9 import java.util.Map JavaDoc;
10 import java.security.MessageDigest JavaDoc;
11
12 /**
13  * An interface that can be used to augment the behavior of a digest hash.
14  * One example usecase is with the password based login modules to
15  * modify the behavior of the hashing to introduce prefix/suffix salts.
16  *
17  * @author Scott.Stark@jboss.org
18  * @version $Revision: 1.1 $
19  */
20 public interface DigestCallback
21 {
22    /** Pass through access to the login module options. When coming from a
23     * login module this includes the following keys:
24     * javax.security.auth.login.name - for the username
25     * javax.security.auth.login.password - for the String password
26     */
27    public void init(Map JavaDoc options);
28    /**
29     * Pre-hash callout to allow for content before the password. Any content
30     * should be added using the MessageDigest update methods.
31     * @param digest - the security digest being used for the one-way hash
32     */
33    public void preDigest(MessageDigest JavaDoc digest);
34    /** Post-hash callout afer the password has been added to allow for content
35     * after the password has been added. Any content should be added using the
36     * MessageDigest update methods.
37     * @param digest - the security digest being used for the one-way hash
38     */
39    public void postDigest(MessageDigest JavaDoc digest);
40 }
41
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