mitm.common.security.certificate.CertificateEncoder.java Source code

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Here is the source code for mitm.common.security.certificate.CertificateEncoder.java

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/*
 * Copyright (c) 2008-2011, Martijn Brinkers, Djigzo.
 * 
 * This file is part of Djigzo email encryption.
 *
 * Djigzo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License 
 * version 3, 19 November 2007 as published by the Free Software 
 * Foundation.
 *
 * Djigzo 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public 
 * License along with Djigzo. If not, see <http://www.gnu.org/licenses/>
 *
 * Additional permission under GNU AGPL version 3 section 7
 * 
 * If you modify this Program, or any covered work, by linking or 
 * combining it with aspectjrt.jar, aspectjweaver.jar, tyrex-1.0.3.jar, 
 * freemarker.jar, dom4j.jar, mx4j-jmx.jar, mx4j-tools.jar, 
 * spice-classman-1.0.jar, spice-loggerstore-0.5.jar, spice-salt-0.8.jar, 
 * spice-xmlpolicy-1.0.jar, saaj-api-1.3.jar, saaj-impl-1.3.jar, 
 * wsdl4j-1.6.1.jar (or modified versions of these libraries), 
 * containing parts covered by the terms of Eclipse Public License, 
 * tyrex license, freemarker license, dom4j license, mx4j license,
 * Spice Software License, Common Development and Distribution License
 * (CDDL), Common Public License (CPL) the licensors of this Program grant 
 * you additional permission to convey the resulting work.
 */
package mitm.common.security.certificate;

import java.io.IOException;
import java.security.NoSuchProviderException;
import java.security.cert.CertPath;
import java.security.cert.Certificate;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

import mitm.common.security.SecurityFactory;
import mitm.common.security.SecurityFactoryFactory;
import mitm.common.security.asn1.ASN1Encoder;
import mitm.common.security.asn1.DERUtils;
import mitm.common.security.asn1.ObjectEncoding;

import org.bouncycastle.asn1.ASN1EncodableVector;

public class CertificateEncoder {
    /*
     * Converts to Certificate to a byte array
     */
    public static byte[] encode(Certificate certificate, ObjectEncoding encoding)
            throws CertificateEncodingException, IOException {
        switch (encoding) {
        case DER:
            return certificate.getEncoded();
        case PEM:
            return ASN1Encoder.encodePEM(Collections.singletonList(certificate));
        default:
            throw new IllegalArgumentException("Unknown encoding: " + encoding);
        }
    }

    /**
     * Convert the collection of certificates to a byte array using the specified encoding
     * @param certificates
     * @param encoding
     * @return
     * @throws CertificateEncodingException
     * @throws IOException
     */
    public static byte[] encode(Collection<? extends Certificate> certificates, ObjectEncoding encoding)
            throws CertificateEncodingException, IOException {
        switch (encoding) {
        case DER:
            return encodePKCS7(certificates);
        case PEM:
            return ASN1Encoder.encodePEM(certificates);
        default:
            throw new IllegalArgumentException("Unknown encoding: " + encoding);
        }
    }

    /**
     * Convert the collection of certificates to a byte array using the specified encoding. This 
     * method uses the crypto provider CertPath to do the conversion. The Bouncycastle version
     * of CertPath is slow so the other method should be used if speed is important. The
     * supoprted encodings depend on the actual implementation of CertPath. 
     * Use the other encode method if speed is important!
     * @param certificates
     * @param encoding
     * @return
     * @throws IOException
     * @throws NoSuchProviderException 
     * @throws CertificateException 
     */
    public static byte[] encode(Collection<? extends Certificate> certificates, String encoding)
            throws IOException, CertificateException, NoSuchProviderException {
        SecurityFactory securityFactory = SecurityFactoryFactory.getSecurityFactory();

        CertificateFactory certificateFactory = securityFactory.createCertificateFactory("X.509");

        List<? extends Certificate> certificateList = new LinkedList<Certificate>(certificates);

        CertPath certPath = certificateFactory.generateCertPath(certificateList);

        byte[] encoded = certPath.getEncoded();

        return encoded;
    }

    private static byte[] encodePKCS7(Collection<? extends Certificate> certificates)
            throws IOException, CertificateEncodingException {
        ASN1EncodableVector asn1Certificates = new ASN1EncodableVector();

        Iterator<? extends Certificate> certificateIt = certificates.iterator();

        while (certificateIt.hasNext()) {
            Certificate certificate = certificateIt.next();

            asn1Certificates.add(DERUtils.toDERObject(certificate));
        }

        return ASN1Encoder.encodePKCS7(asn1Certificates, null /* no CRLs */);
    }
}