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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.6.

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package org.bouncycastle.asn1;

import java.io.InputStream;
import java.io.IOException;

public class DEROctetStringParser
    implements ASN1OctetStringParser
{
    private DefiniteLengthInputStream stream;

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

    public InputStream getOctetStream()
    {
        return stream;
    }

    public DERObject getDERObject()
    {
        try
        {
            return new DEROctetString(stream.toByteArray());
        }
        catch (IOException e)
        {
            throw new IllegalStateException("IOException converting stream to byte array: " + e.getMessage());
        }
    }
}