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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.io.InputStream;

import org.bouncycastle.util.io.Streams;

/**
 * A parser for indefinite-length OCTET STRINGs.
 */
public class BEROctetStringParser
    implements ASN1OctetStringParser
{
    private ASN1StreamParser _parser;

    BEROctetStringParser(
        ASN1StreamParser parser)
    {
        _parser = parser;
    }

    /**
     * Return an InputStream representing the contents of the OCTET STRING.
     *
     * @return an InputStream with its source as the OCTET STRING content.
     */
    public InputStream getOctetStream()
    {
        return new ConstructedOctetStream(_parser);
    }

    /**
     * Return an in-memory, encodable, representation of the OCTET STRING.
     *
     * @return a BEROctetString.
     * @throws IOException if there is an issue loading the data.
     */
    public ASN1Primitive getLoadedObject()
        throws IOException
    {
        return new BEROctetString(Streams.readAll(getOctetStream()));
    }

    /**
     * Return an BEROctetString representing this parser and its contents.
     *
     * @return an BEROctetString
     */
    public ASN1Primitive toASN1Primitive()
    {
        try
        {
            return getLoadedObject();
        }
        catch (IOException e)
        {
            throw new ASN1ParsingException("IOException converting stream to byte array: " + e.getMessage(), e);
        }
    }
}