mirror of git://gcc.gnu.org/git/gcc.git
129 lines
3.8 KiB
Java
129 lines
3.8 KiB
Java
/* IALG.java --
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Copyright (C) 2003, 2006 Free Software Foundation, Inc.
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This file is a part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.javax.crypto.sasl.srp;
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import gnu.javax.crypto.mac.IMac;
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import gnu.javax.crypto.mac.MacFactory;
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import java.security.InvalidKeyException;
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import java.security.NoSuchAlgorithmException;
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import java.util.HashMap;
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import javax.security.sasl.SaslException;
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/**
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* A Factory class that returns IALG (Integrity Algorithm) instances that
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* operate as described in the draft-burdis-cat-sasl-srp-04 and later.
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*/
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public final class IALG
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implements Cloneable
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{
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private IMac hmac;
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/** Private constructor to enforce instantiation through Factory method. */
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private IALG(final IMac hmac)
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{
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super();
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this.hmac = hmac;
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}
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/**
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* Returns an instance of a SASL-SRP IALG implementation.
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*
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* @param algorithm the name of the HMAC algorithm.
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* @return an instance of this object.
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*/
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static synchronized IALG getInstance(final String algorithm)
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throws SaslException
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{
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final IMac hmac;
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hmac = MacFactory.getInstance(algorithm);
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if (hmac == null)
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throw new SaslException("getInstance()",
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new NoSuchAlgorithmException(algorithm));
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return new IALG(hmac);
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}
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public Object clone() throws CloneNotSupportedException
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{
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return new IALG((IMac) hmac.clone());
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}
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public void init(final KDF kdf) throws SaslException
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{
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try
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{
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final byte[] sk = kdf.derive(hmac.macSize());
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final HashMap map = new HashMap();
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map.put(IMac.MAC_KEY_MATERIAL, sk);
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hmac.init(map);
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}
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catch (InvalidKeyException x)
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{
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throw new SaslException("getInstance()", x);
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}
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}
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public void update(final byte[] data)
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{
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hmac.update(data, 0, data.length);
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}
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public void update(final byte[] data, final int offset, final int length)
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{
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hmac.update(data, offset, length);
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}
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public byte[] doFinal()
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{
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return hmac.digest();
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}
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/**
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* Returns the length (in bytes) of this SASL SRP Integrity Algorithm.
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*
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* @return the length, in bytes, of this integrity protection algorithm.
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*/
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public int length()
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{
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return hmac.macSize();
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}
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}
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