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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 to JDK 1.8. 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.cms;

import java.io.BufferedInputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.util.io.Streams;

public class CMSTypedStream
{
    private static final int BUF_SIZ = 32 * 1024;
    
    private final ASN1ObjectIdentifier      _oid;

    protected InputStream _in;

    public CMSTypedStream(
        InputStream in)
    {
        this(PKCSObjectIdentifiers.data.getId(), in, BUF_SIZ);
    }
    
    public CMSTypedStream(
         String oid,
         InputStream in)
    {
        this(new ASN1ObjectIdentifier(oid), in, BUF_SIZ);
    }
    
    public CMSTypedStream(
        String      oid,
        InputStream in,
        int         bufSize)
    {
        this(new ASN1ObjectIdentifier(oid), in, bufSize);
    }

    public CMSTypedStream(
         ASN1ObjectIdentifier oid,
         InputStream in)
    {
        this(oid, in, BUF_SIZ);
    }

    public CMSTypedStream(
        ASN1ObjectIdentifier      oid,
        InputStream in,
        int         bufSize)
    {
        _oid = oid;
        _in = new FullReaderStream(new BufferedInputStream(in, bufSize));
    }

    protected CMSTypedStream(
         ASN1ObjectIdentifier oid)
    {
        _oid = oid;
    }

    public ASN1ObjectIdentifier getContentType()
    {
        return _oid;
    }
    
    public InputStream getContentStream()
    {
        return _in;
    }

    public void drain() 
        throws IOException
    {
        Streams.drain(_in);
        _in.close();
    }

    private static class FullReaderStream extends FilterInputStream
    {
        FullReaderStream(InputStream in)
        {
            super(in);
        }

        public int read(byte[] buf, int off, int len) throws IOException
        {
            int totalRead = Streams.readFully(super.in, buf, off, len);
            return totalRead > 0 ? totalRead : -1;
        }
    }
}