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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;

/**
 * Parser for DER encoded OCTET STRINGS
 */
public class DEROctetStringParser
    implements ASN1OctetStringParser
{
    private DefiniteLengthInputStream stream;

    DEROctetStringParser(
        DefiniteLengthInputStream stream)
    {
        this.stream = stream;
    }

    /**
     * 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 stream;
    }

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

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