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The Apache WSS4J project provides a Java implementation of the primary security standards for Web Services, namely the OASIS Web Services Security (WS-Security) specifications from the OASIS Web Services Security TC.
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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.ws.security.message.token;

import org.apache.ws.security.WSConstants;
import org.apache.ws.security.WSSecurityException;
import org.apache.ws.security.components.crypto.Crypto;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

import java.io.InputStream;
import java.io.ByteArrayInputStream;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;

/**
 * X509 Security Token.
 *
 * @author Davanum Srinivas ([email protected]).
 */
public class X509Security extends BinarySecurity {
    
    public static final String X509_V3_TYPE = WSConstants.X509TOKEN_NS + "#X509v3";
    
    /*
     * Stores the associated X.509 Certificate. This saves numerous
     * crypto loadCertificate operations
     */
    private X509Certificate cachedCert = null;

    /**
     * This constructor creates a new X509 certificate object and initializes
     * it from the data contained in the element.
     *
     * @param elem the element containing the X509 certificate data
     * @throws WSSecurityException
     */
    public X509Security(Element elem) throws WSSecurityException {
        this(elem, true);
    }
    
    /**
     * This constructor creates a new X509 certificate object and initializes
     * it from the data contained in the element.
     *
     * @param elem the element containing the X509 certificate data
     * @param bspCompliant Whether the token is processed according to the BSP spec
     * @throws WSSecurityException
     */
    public X509Security(Element elem, boolean bspCompliant) throws WSSecurityException {
        super(elem, bspCompliant);
        String valueType = getValueType();
        if (bspCompliant && !X509_V3_TYPE.equals(valueType)) {
            throw new WSSecurityException(
                WSSecurityException.INVALID_SECURITY_TOKEN, 
                "invalidValueType", 
                new Object[]{valueType}
            );
        }
    }

    /**
     * This constructor creates a new X509 certificate element.
     *
     * @param doc
     */
    public X509Security(Document doc) {
        super(doc);
        setValueType(X509_V3_TYPE);
    }

    /**
     * Gets the X509Certificate certificate.
     *
     * @return the X509 certificate converted from the base 64 encoded element data
     * @throws WSSecurityException
     */
    public X509Certificate getX509Certificate(Crypto crypto) throws WSSecurityException {
        if (cachedCert != null) {
            return cachedCert;
        }
        if (crypto == null) {
            throw new WSSecurityException(WSSecurityException.FAILURE, "noSigCryptoFile");
        }
        byte[] data = getToken();
        if (data == null) {
            throw new WSSecurityException(
                WSSecurityException.FAILURE, "invalidCertData", new Object[]{Integer.valueOf(0)}
            );
        }
        InputStream in = new ByteArrayInputStream(data);
        cachedCert = crypto.loadCertificate(in);
        return cachedCert;
    }

    /**
     * Sets the X509Certificate.
     * This functions takes the X509 certificate, gets the data from it as
     * encoded bytes, and sets the data as base 64 encoded data in the text
     * node of the element
     *
     * @param cert the X509 certificate to store in the element
     * @throws WSSecurityException
     */
    public void setX509Certificate(X509Certificate cert) throws WSSecurityException {
        if (cert == null) {
            throw new WSSecurityException(WSSecurityException.FAILURE, "noCert");
        }
        cachedCert = cert;
        try {
            setToken(cert.getEncoded());
        } catch (CertificateEncodingException e) {
            throw new WSSecurityException(
                WSSecurityException.SECURITY_TOKEN_UNAVAILABLE, "encodeError", null, e
            );
        }
    }
}