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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.asn1;

import java.io.IOException;
import java.util.Enumeration;
import java.util.NoSuchElementException;

class LazyConstructionEnumeration
    implements Enumeration
{
    private ASN1InputStream aIn;
    private Object          nextObj;

    public LazyConstructionEnumeration(byte[] encoded)
    {
        aIn = new ASN1InputStream(encoded, true);
        nextObj = readObject();
    }

    public boolean hasMoreElements()
    {
        return nextObj != null;
    }

    public Object nextElement()
    {
        if (nextObj != null)
        {
            Object o = nextObj;
            nextObj = readObject();
            return o;
        }
        throw new NoSuchElementException();
    }

    private Object readObject()
    {
        try
        {
            return aIn.readObject();
        }
        catch (IOException e)
        {
            throw new ASN1ParsingException("malformed DER construction: " + e, e);
        }
    }
}