org.openxdm.xcap.server.slee.auth.RFC2617AuthQopDigest.java Source code

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Here is the source code for org.openxdm.xcap.server.slee.auth.RFC2617AuthQopDigest.java

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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2011, Red Hat, Inc. and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.openxdm.xcap.server.slee.auth;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import org.apache.commons.httpclient.util.EncodingUtil;
import org.apache.log4j.Logger;
import org.openxdm.xcap.common.error.InternalServerErrorException;

/**
 * 
 * @author martins
 *
 */
public class RFC2617AuthQopDigest {

    private static final Logger logger = Logger.getLogger(RFC2617AuthQopDigest.class);

    /**
     * 
     */
    private final String username;

    /**
     * 
     */
    private final String realm;

    /**
     * 
     */
    private final String password;

    /**
     * 
     */
    private final String nonce;

    /**
     * 
     */
    private final String nonceCount;

    /**
     * 
     */
    private final String cnonce;

    /**
     * 
     */
    private final String qop = "auth";

    /**
     * 
     */
    private final String method;

    /**
     * 
     */
    private final String digestUri;

    /**
     * 
     * @param username
     * @param realm
     * @param password
     * @param nonce
     * @param nonceCount
     * @param cnonce
     * @param qop
     * @param method
     * @param digestUri
     */
    public RFC2617AuthQopDigest(String username, String realm, String password, String nonce, String nonceCount,
            String cnonce, String method, String digestUri) {
        this.username = username;
        this.realm = realm;
        this.password = password;
        this.nonce = nonce;
        this.nonceCount = nonceCount;
        this.cnonce = cnonce;
        this.method = method;
        this.digestUri = digestUri;
    }

    /**
     * Calculates the encoded http digest according to RFC 2617 with "auth" qop.
     * 
     * @return
     * @throws NoSuchAlgorithmException
     */
    public String digest() throws InternalServerErrorException {

        if (logger.isDebugEnabled()) {
            logger.debug("Calculating RFC 2617 qop=auth digest with params: username = " + username + " , realm = "
                    + realm + " , password = " + password + " , nonce = " + nonce + " , nonceCount = " + nonceCount
                    + " , cnonce = " + cnonce + " , method = " + method + " , digestUri = " + digestUri + " ;");
        }

        MessageDigest messageDigest = null;
        try {
            messageDigest = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            throw new InternalServerErrorException(
                    "failed to get instance of MD5 digest, used in " + this.getClass());
        }

        final String a1 = username + ":" + realm + ":" + password;
        final String ha1 = AsciiHexStringEncoder.encode(messageDigest.digest(EncodingUtil.getAsciiBytes(a1)));

        final String a2 = method + ":" + digestUri;
        final String ha2 = AsciiHexStringEncoder.encode(messageDigest.digest(EncodingUtil.getAsciiBytes(a2)));

        final String kd = ha1 + ":" + nonce + ":" + nonceCount + ":" + cnonce + ":" + qop + ":" + ha2;

        return AsciiHexStringEncoder.encode(messageDigest.digest(EncodingUtil.getAsciiBytes(kd)));
    }

}