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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.cms;

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

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.asn1.cms.DigestedData;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.operator.DigestCalculator;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Encodable;

/**
 * containing class for an CMS Digested Data object
 *  *     CMSDigestedData cd = new CMSDigestedData(inputStream);
 *
 *
 *     process(cd.getContent());
 * 
 */
public class CMSDigestedData
    implements Encodable
{
    private ContentInfo  contentInfo;
    private DigestedData digestedData;

    public CMSDigestedData(
        byte[] compressedData)
        throws CMSException
    {
        this(CMSUtils.readContentInfo(compressedData));
    }

    public CMSDigestedData(
        InputStream compressedData)
        throws CMSException
    {
        this(CMSUtils.readContentInfo(compressedData));
    }

    public CMSDigestedData(
        ContentInfo contentInfo)
        throws CMSException
    {
        this.contentInfo = contentInfo;

        try
        {
            this.digestedData = DigestedData.getInstance(contentInfo.getContent());
        }
        catch (ClassCastException e)
        {
            throw new CMSException("Malformed content.", e);
        }
        catch (IllegalArgumentException e)
        {
            throw new CMSException("Malformed content.", e);
        }
    }

    public ASN1ObjectIdentifier getContentType()
    {
        return contentInfo.getContentType();
    }

    public AlgorithmIdentifier getDigestAlgorithm()
    {
        return digestedData.getDigestAlgorithm();
    }

    /**
     * Return the digested content
     *
     * @return the digested content
     * @throws CMSException if there is an exception un-compressing the data.
     */
    public CMSProcessable getDigestedContent()
        throws CMSException
    {
        ContentInfo     content = digestedData.getEncapContentInfo();

        try
        {
            return new CMSProcessableByteArray(content.getContentType(), ((ASN1OctetString)content.getContent()).getOctets());
        }
        catch (Exception e)
        {
            throw new CMSException("exception reading digested stream.", e);
        }
    }

    /**
     * return the ContentInfo
     */
    public ContentInfo toASN1Structure()
    {
        return contentInfo;
    }

    /**
     * return the ASN.1 encoded representation of this object.
     */
    public byte[] getEncoded()
        throws IOException
    {
        return contentInfo.getEncoded();
    }

    public boolean verify(DigestCalculatorProvider calculatorProvider)
        throws CMSException
    {
        try
        {
            ContentInfo     content = digestedData.getEncapContentInfo();
            DigestCalculator calc = calculatorProvider.get(digestedData.getDigestAlgorithm());

            OutputStream dOut = calc.getOutputStream();

            dOut.write(((ASN1OctetString)content.getContent()).getOctets());

            return Arrays.areEqual(digestedData.getDigest(), calc.getDigest());
        }
        catch (OperatorCreationException e)
        {
            throw new CMSException("unable to create digest calculator: " + e.getMessage(), e);
        }
        catch (IOException e)
        {
            throw new CMSException("unable process content: " + e.getMessage(), e);
        }
    }
}