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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.IOException;
import java.io.InputStream;

import org.bouncycastle.asn1.ASN1SequenceParser;
import org.bouncycastle.asn1.ASN1StreamParser;
import org.bouncycastle.asn1.cms.ContentInfoParser;

public class CMSContentInfoParser
{
    protected ContentInfoParser _contentInfo;
    protected InputStream       _data;

    protected CMSContentInfoParser(
        InputStream data)
        throws CMSException
    {
        _data = data;
        
        try
        {
            ASN1StreamParser in = new ASN1StreamParser(data);
            ASN1SequenceParser seqParser = (ASN1SequenceParser)in.readObject();

            if (seqParser == null)
            {
                throw new CMSException("No content found.");
            }

            _contentInfo = new ContentInfoParser(seqParser);
        }
        catch (IOException e)
        {
            throw new CMSException("IOException reading content.", e);
        }
        catch (ClassCastException e)
        {
            throw new CMSException("Unexpected object reading content.", e);
        }
    }
    
    /**
     * Close the underlying data stream.
     * @throws IOException if the close fails.
     */
    public void close() throws IOException
    {
        _data.close();
    }
}