mitm.common.security.asn1.ASN1Utils.java Source code

Introduction

Here is the source code for mitm.common.security.asn1.ASN1Utils.java

Source

/*
 * Copyright (c) 2008-2012, 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.asn1;

import java.io.IOException;
import java.security.cert.X509Extension;
import java.util.Enumeration;

import javax.security.auth.x500.X500Principal;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.cms.AttributeTable;
import org.bouncycastle.asn1.util.ASN1Dump;

public class ASN1Utils {
    public static void dump(AttributeTable attributeTable, StringBuilder sb) {
        if (attributeTable == null) {
            return;
        }

        ASN1EncodableVector vector = attributeTable.toASN1EncodableVector();

        for (int i = 0; i < vector.size(); i++) {
            ASN1Encodable der = vector.get(i);

            sb.append(ASN1Dump.dumpAsString(der));
        }
    }

    public static String dump(AttributeTable attributeTable) {
        StringBuilder sb = new StringBuilder();

        dump(attributeTable, sb);

        return sb.toString();
    }

    public static ASN1Object getExtensionValue(X509Extension extension, String oid) throws IOException {
        if (extension == null) {
            return null;
        }

        byte[] bytes = extension.getExtensionValue(oid);

        if (bytes == null) {
            return null;
        }

        return getObject(oid, bytes);
    }

    private static ASN1Object getObject(String oid, byte[] extension) throws IOException {
        ASN1InputStream aIn = new ASN1InputStream(extension);
        ASN1OctetString octs = (ASN1OctetString) aIn.readObject();
        aIn.close();
        aIn = new ASN1InputStream(octs.getOctets());
        ASN1Object obj = aIn.readObject();
        aIn.close();
        return obj;
    }

    public static ASN1EncodableVector toASN1EncodableVector(X500Principal principal) throws IOException {
        final ASN1InputStream stream = new ASN1InputStream(principal.getEncoded());
        final ASN1Object der = stream.readObject();

        Enumeration<?> e = ASN1Sequence.getInstance(der).getObjects();

        ASN1EncodableVector v = new ASN1EncodableVector();

        while (e.hasMoreElements()) {
            Object o = e.nextElement();

            if (o instanceof ASN1Encodable) {
                v.add((ASN1Encodable) o);
            }
        }

        stream.close();
        return v;
    }
}