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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

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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();
    }
}