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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.cert.ocsp;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;
import java.util.Set;

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1Exception;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OutputStream;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ocsp.OCSPRequest;
import org.bouncycastle.asn1.ocsp.Request;
import org.bouncycastle.asn1.x509.Certificate;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.Extensions;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.cert.CertIOException;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.operator.ContentVerifier;
import org.bouncycastle.operator.ContentVerifierProvider;

/**
 *  * OCSPRequest     ::=     SEQUENCE {
 *       tbsRequest                  TBSRequest,
 *       optionalSignature   [0]     EXPLICIT Signature OPTIONAL }
 *
 *   TBSRequest      ::=     SEQUENCE {
 *       version             [0]     EXPLICIT Version DEFAULT v1,
 *       requestorName       [1]     EXPLICIT GeneralName OPTIONAL,
 *       requestList                 SEQUENCE OF Request,
 *       requestExtensions   [2]     EXPLICIT Extensions OPTIONAL }
 *
 *   Signature       ::=     SEQUENCE {
 *       signatureAlgorithm      AlgorithmIdentifier,
 *       signature               BIT STRING,
 *       certs               [0] EXPLICIT SEQUENCE OF Certificate OPTIONAL}
 *
 *   Version         ::=             INTEGER  {  v1(0) }
 *
 *   Request         ::=     SEQUENCE {
 *       reqCert                     CertID,
 *       singleRequestExtensions     [0] EXPLICIT Extensions OPTIONAL }
 *
 *   CertID          ::=     SEQUENCE {
 *       hashAlgorithm       AlgorithmIdentifier,
 *       issuerNameHash      OCTET STRING, -- Hash of Issuer's DN
 *       issuerKeyHash       OCTET STRING, -- Hash of Issuers public key
 *       serialNumber        CertificateSerialNumber }
 * 
 */
public class OCSPReq
{
    private static final X509CertificateHolder[] EMPTY_CERTS = new X509CertificateHolder[0];

    private OCSPRequest    req;
    private Extensions extensions;

    public OCSPReq(
        OCSPRequest req)
    {
        this.req = req;
        this.extensions = req.getTbsRequest().getRequestExtensions();
    }
    
    public OCSPReq(
        byte[]          req)
        throws IOException
    {
        this(new ASN1InputStream(req));
    }

    private OCSPReq(
        ASN1InputStream aIn)
        throws IOException
    {
        try
        {
            this.req = OCSPRequest.getInstance(aIn.readObject());
            if (req == null)
            {
                throw new CertIOException("malformed request: no request data found");
            }
            this.extensions = req.getTbsRequest().getRequestExtensions();
        }
        catch (IllegalArgumentException e)
        {
            throw new CertIOException("malformed request: " + e.getMessage(), e);
        }
        catch (ClassCastException e)
        {
            throw new CertIOException("malformed request: " + e.getMessage(), e);
        }
        catch (ASN1Exception e)
        {
            throw new CertIOException("malformed request: " + e.getMessage(), e);
        }
    }

    public int getVersionNumber()
    {
        return req.getTbsRequest().getVersion().intValueExact() + 1;
    }

    public GeneralName getRequestorName()
    {
        return GeneralName.getInstance(req.getTbsRequest().getRequestorName());
    }

    public Req[] getRequestList()
    {
        ASN1Sequence    seq = req.getTbsRequest().getRequestList();
        Req[]           requests = new Req[seq.size()];

        for (int i = 0; i != requests.length; i++)
        {
            requests[i] = new Req(Request.getInstance(seq.getObjectAt(i)));
        }

        return requests;
    }

    public boolean hasExtensions()
    {
        return extensions != null;
    }

    public Extension getExtension(ASN1ObjectIdentifier oid)
    {
        if (extensions != null)
        {
            return extensions.getExtension(oid);
        }

        return null;
    }

    public List getExtensionOIDs()
    {
        return OCSPUtils.getExtensionOIDs(extensions);
    }

    public Set getCriticalExtensionOIDs()
    {
        return OCSPUtils.getCriticalExtensionOIDs(extensions);
    }

    public Set getNonCriticalExtensionOIDs()
    {
        return OCSPUtils.getNonCriticalExtensionOIDs(extensions);
    }

    /**
     * return the object identifier representing the signature algorithm
     */
    public ASN1ObjectIdentifier getSignatureAlgOID()
    {
        if (!this.isSigned())
        {
            return null;
        }

        return req.getOptionalSignature().getSignatureAlgorithm().getAlgorithm();
    }

    public byte[] getSignature()
    {
        if (!this.isSigned())
        {
            return null;
        }

        return req.getOptionalSignature().getSignature().getOctets();
    }

    public X509CertificateHolder[] getCerts()
    {
        //
        // load the certificates if we have any
        //
        if (req.getOptionalSignature() != null)
        {
            ASN1Sequence s = req.getOptionalSignature().getCerts();

            if (s != null)
            {
                X509CertificateHolder[] certs = new X509CertificateHolder[s.size()];

                for (int i = 0; i != certs.length; i++)
                {
                    certs[i] = new X509CertificateHolder(Certificate.getInstance(s.getObjectAt(i)));
                }

                return certs;
            }

            return EMPTY_CERTS;
        }
        else
        {
            return EMPTY_CERTS;
        }
    }
    
    /**
     * Return whether or not this request is signed.
     * 
     * @return true if signed false otherwise.
     */
    public boolean isSigned()
    {
        return req.getOptionalSignature() != null;
    }

    /**
     * verify the signature against the TBSRequest object we contain.
     */
    public boolean isSignatureValid(
        ContentVerifierProvider verifierProvider)
        throws OCSPException
    {
        if (!this.isSigned())
        {
            throw new OCSPException("attempt to verify signature on unsigned object");
        }

        try
        {
            ContentVerifier verifier = verifierProvider.get(req.getOptionalSignature().getSignatureAlgorithm());
            OutputStream sOut = verifier.getOutputStream();

            sOut.write(req.getTbsRequest().getEncoded(ASN1Encoding.DER));

            return verifier.verify(this.getSignature());
        }
        catch (Exception e)
        {
            throw new OCSPException("exception processing signature: " + e, e);
        }
    }

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