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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.its.asn1;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;

/**
 *  *     CertificateBase ::= SEQUENCE {
 *         version Uint8(3),
 *         type CertificateType,
 *         issuer IssuerIdentifier,
 *         toBeSigned ToBeSignedCertificate,
 *         signature Signature OPTIONAL
 *     }
 * 
 */
public class CertificateBase
    extends ASN1Object
{
    private CertificateType type;
    private byte[] version;

    protected CertificateBase(ASN1Sequence seq)
    {

    }

    public static CertificateBase getInstance(Object o)
    {
        if (o instanceof ImplicitCertificate)
        {
            return (ImplicitCertificate)o;
        }
        if (o instanceof ExplicitCertificate)
        {
            return (ExplicitCertificate)o;
        }

        if (o != null)
        {
            ASN1Sequence seq = ASN1Sequence.getInstance(o);

            if (seq.getObjectAt(1).equals(CertificateType.Implicit))
            {
                return ImplicitCertificate.getInstance(seq);
            }
            if (seq.getObjectAt(1).equals(CertificateType.Explicit))
            {
                return ExplicitCertificate.getInstance(seq);
            }
            throw new IllegalArgumentException("unknown certificate type");
        }

        return null;
    }

    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector v = new ASN1EncodableVector();

        return new DERSequence(v);
    }
}