1 /* CramMD5Client.java --
2 Copyright (C) 2003, 2006 Free Software Foundation, Inc.
4 This file is a part of GNU Classpath.
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.
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.
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
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
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
29 modules, and to copy and distribute the resulting executable under
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. */
39 package gnu.javax.crypto.sasl.crammd5;
41 import gnu.java.security.Registry;
42 import gnu.java.security.util.Util;
43 import gnu.javax.crypto.sasl.ClientMechanism;
45 import java.io.IOException;
46 import java.security.InvalidKeyException;
48 import javax.security.auth.callback.Callback;
49 import javax.security.auth.callback.NameCallback;
50 import javax.security.auth.callback.PasswordCallback;
51 import javax.security.auth.callback.UnsupportedCallbackException;
52 import javax.security.sasl.AuthenticationException;
53 import javax.security.sasl.SaslClient;
54 import javax.security.sasl.SaslException;
57 * The CRAM-MD5 SASL client-side mechanism.
59 public class CramMD5Client
60 extends ClientMechanism
63 public CramMD5Client()
65 super(Registry.SASL_CRAM_MD5_MECHANISM);
68 protected void initMechanism() throws SaslException
72 protected void resetMechanism() throws SaslException
76 public boolean hasInitialResponse()
81 public byte[] evaluateChallenge(final byte[] challenge) throws SaslException
83 if (challenge == null)
84 throw new SaslException("null challenge");
87 final String username;
88 final char[] password;
90 if ((! properties.containsKey(Registry.SASL_USERNAME))
91 && (! properties.containsKey(Registry.SASL_PASSWORD)))
93 callbacks = new Callback[2];
94 final NameCallback nameCB;
95 final String defaultName = System.getProperty("user.name");
96 if (defaultName == null)
97 nameCB = new NameCallback("username: ");
99 nameCB = new NameCallback("username: ", defaultName);
100 final PasswordCallback pwdCB = new PasswordCallback("password: ",
102 callbacks[0] = nameCB;
103 callbacks[1] = pwdCB;
104 this.handler.handle(callbacks);
105 username = nameCB.getName();
106 password = pwdCB.getPassword();
110 if (properties.containsKey(Registry.SASL_USERNAME))
111 username = (String) properties.get(Registry.SASL_USERNAME);
114 callbacks = new Callback[1];
115 final NameCallback nameCB;
116 final String defaultName = System.getProperty("user.name");
117 if (defaultName == null)
118 nameCB = new NameCallback("username: ");
120 nameCB = new NameCallback("username: ", defaultName);
121 callbacks[0] = nameCB;
122 this.handler.handle(callbacks);
123 username = nameCB.getName();
126 if (properties.containsKey(Registry.SASL_PASSWORD))
127 password = ((String) properties.get(Registry.SASL_PASSWORD)).toCharArray();
130 callbacks = new Callback[1];
131 final PasswordCallback pwdCB = new PasswordCallback("password: ",
133 callbacks[0] = pwdCB;
134 this.handler.handle(callbacks);
135 password = pwdCB.getPassword();
138 if (password == null)
139 throw new SaslException("null password supplied");
143 digest = CramMD5Util.createHMac(password, challenge);
145 catch (InvalidKeyException x)
147 throw new AuthenticationException("evaluateChallenge()", x);
149 final String response = username + " "
150 + Util.toString(digest).toLowerCase();
151 this.complete = true;
152 return response.getBytes("UTF-8");
154 catch (UnsupportedCallbackException x)
156 throw new AuthenticationException("evaluateChallenge()", x);
158 catch (IOException x)
160 throw new AuthenticationException("evaluateChallenge()", x);
164 protected String getNegotiatedQOP()
166 return Registry.QOP_AUTH;