ec.rubrica.cert.CertUtils.java Source code

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Here is the source code for ec.rubrica.cert.CertUtils.java

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/*
 * Copyright (c) 2009-2013 Rubrica.ec
 * 
 * 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.
 */

package ec.rubrica.cert;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.security.cert.X509Certificate;

import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1String;
import org.bouncycastle.asn1.DEROctetString;

/**
 * Utilidades para trabajar con Certificados.
 * 
 * @author Ricardo Arguello <ricardo@rubrica.ec>
 */
public class CertUtils {

    public static String getExtensionValue(X509Certificate certificate, String oid) throws IOException {
        String decoded = null;
        byte[] extensionValue = certificate.getExtensionValue(oid);

        if (extensionValue != null) {
            ASN1Primitive derObject = toDERObject(extensionValue);
            if (derObject instanceof DEROctetString) {
                DEROctetString derOctetString = (DEROctetString) derObject;
                derObject = toDERObject(derOctetString.getOctets());
                if (derObject instanceof ASN1String) {
                    ASN1String s = (ASN1String) derObject;
                    decoded = s.getString();
                }
            }
        }
        return decoded;
    }

    private static ASN1Primitive toDERObject(byte[] data) throws IOException {
        ByteArrayInputStream inStream = new ByteArrayInputStream(data);
        ASN1InputStream asnInputStream = null;

        try {
            asnInputStream = new ASN1InputStream(inStream);
            return asnInputStream.readObject();
        } finally {
            if (asnInputStream != null) {
                try {
                    asnInputStream.close();
                } catch (IOException ignore) {
                }
            }
        }
    }
}