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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.asn1.test;

import java.io.ByteArrayInputStream;

import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.ocsp.BasicOCSPResponse;
import org.bouncycastle.asn1.ocsp.OCSPRequest;
import org.bouncycastle.asn1.ocsp.OCSPResponse;
import org.bouncycastle.asn1.ocsp.ResponseBytes;
import org.bouncycastle.util.encoders.Base64;
import org.bouncycastle.util.test.Test;
import org.bouncycastle.util.test.TestResult;
import org.bouncycastle.util.test.SimpleTestResult;

public class OCSPTest
    implements Test
{
    private byte[] unsignedReq = Base64.decode(
        "MEIwQDA+MDwwOjAJBgUrDgMCGgUABBRDb9GODnq7lRhSkEqw4XX24huERwQUkY4j"
      + "a6eKuDlkVP9hRgkEvIWqHPECAQE=");
    
    private byte[] signedReq = Base64.decode(
        "MIIC9jBAMD4wPDA6MAkGBSsOAwIaBQAEFENv0Y4OeruVGFKQSrDhdfbiG4RHBBTc"
      + "Mr1fP+mZAxbF2ZdehWxn6mtAngIBAaCCArAwggKsMA0GCSqGSIb3DQEBBQUAA4GB"
      + "AAzHBm4nL5AcRQB3Jkz7ScNeZF+GbRZ0p4kBDTnqi3IeESuso12yJhpqqyijdnj5"
      + "gd4/GsSAgdluLHyYZ6wgozV7G9MDXCnFnG4PBUW05HaVX81JYAp+amVyU0NOgNrG"
      + "90npVBsHb0o+UlkxNgMiEbSkp/TeGb6YURsYKhmwp7BgoIICFTCCAhEwggINMIIB"
      + "dqADAgECAgEBMA0GCSqGSIb3DQEBBAUAMCUxFjAUBgNVBAoTDUJvdW5jeSBDYXN0"
      + "bGUxCzAJBgNVBAYTAkFVMB4XDTA0MTAyNDEzNDc0M1oXDTA1MDIwMTEzNDc0M1ow"
      + "JTEWMBQGA1UEChMNQm91bmN5IENhc3RsZTELMAkGA1UEBhMCQVUwgZ8wDQYJKoZI"
      + "hvcNAQEBBQADgY0AMIGJAoGBAJBmLeIzthMHUeTkOeJ76iBxcMHY31o/i3a9VT12"
      + "y2FcS/ejJmeUCMTdtwl5alOwXY66vF4DyT1VU/nJG3mHpSoqq7qrMXOIFGcXg1Wf"
      + "oJRrQgTOLdQ6bod7i9ME/EjEJy70orh0nVS7NGcu0R5TjcbLde2J5zxjb/W9wqfy"
      + "RovJAgMBAAGjTTBLMB0GA1UdDgQWBBTcMr1fP+mZAxbF2ZdehWxn6mtAnjAfBgNV"
      + "HSMEGDAWgBTcMr1fP+mZAxbF2ZdehWxn6mtAnjAJBgNVHRMEAjAAMA0GCSqGSIb3"
      + "DQEBBAUAA4GBAF/4EH1KkNrNxocJPIp7lThmG1KIVYESIadowMowrbok46ESofRF"
      + "OIPku07W+e1Y1Y1KXLIiPMG3IGwrBrn04iLsbbBUiN37BcC/VyT4xKJ2MYscGjKL"
      + "ua/9bU0lOyeTRAwqb8towWRd5lLYAI3RQ7dhStUTFp3Vqd803PJ/cpR6");

    private byte[] response = Base64.decode(
            "MIIFnAoBAKCCBZUwggWRBgkrBgEFBQcwAQEEggWCMIIFfjCCARehgZ8wgZwx"
          + "CzAJBgNVBAYTAklOMRcwFQYDVQQIEw5BbmRocmEgcHJhZGVzaDESMBAGA1UE"
          + "BxMJSHlkZXJhYmFkMQwwCgYDVQQKEwNUQ1MxDDAKBgNVBAsTA0FUQzEeMBwG"
          + "A1UEAxMVVENTLUNBIE9DU1AgUmVzcG9uZGVyMSQwIgYJKoZIhvcNAQkBFhVv"
          + "Y3NwQHRjcy1jYS50Y3MuY28uaW4YDzIwMDMwNDAyMTIzNDU4WjBiMGAwOjAJ"
          + "BgUrDgMCGgUABBRs07IuoCWNmcEl1oHwIak1BPnX8QQUtGyl/iL9WJ1VxjxF"
          + "j0hAwJ/s1AcCAQKhERgPMjAwMjA4MjkwNzA5MjZaGA8yMDAzMDQwMjEyMzQ1"
          + "OFowDQYJKoZIhvcNAQEFBQADgYEAfbN0TCRFKdhsmvOdUoiJ+qvygGBzDxD/"
          + "VWhXYA+16AphHLIWNABR3CgHB3zWtdy2j7DJmQ/R7qKj7dUhWLSqclAiPgFt"
          + "QQ1YvSJAYfEIdyHkxv4NP0LSogxrumANcDyC9yt/W9yHjD2ICPBIqCsZLuLk"
          + "OHYi5DlwWe9Zm9VFwCGgggPMMIIDyDCCA8QwggKsoAMCAQICAQYwDQYJKoZI"
          + "hvcNAQEFBQAwgZQxFDASBgNVBAMTC1RDUy1DQSBPQ1NQMSYwJAYJKoZIhvcN"
          + "AQkBFhd0Y3MtY2FAdGNzLWNhLnRjcy5jby5pbjEMMAoGA1UEChMDVENTMQww"
          + "CgYDVQQLEwNBVEMxEjAQBgNVBAcTCUh5ZGVyYWJhZDEXMBUGA1UECBMOQW5k"
          + "aHJhIHByYWRlc2gxCzAJBgNVBAYTAklOMB4XDTAyMDgyOTA3MTE0M1oXDTAz"
          + "MDgyOTA3MTE0M1owgZwxCzAJBgNVBAYTAklOMRcwFQYDVQQIEw5BbmRocmEg"
          + "cHJhZGVzaDESMBAGA1UEBxMJSHlkZXJhYmFkMQwwCgYDVQQKEwNUQ1MxDDAK"
          + "BgNVBAsTA0FUQzEeMBwGA1UEAxMVVENTLUNBIE9DU1AgUmVzcG9uZGVyMSQw"
          + "IgYJKoZIhvcNAQkBFhVvY3NwQHRjcy1jYS50Y3MuY28uaW4wgZ8wDQYJKoZI"
          + "hvcNAQEBBQADgY0AMIGJAoGBAM+XWW4caMRv46D7L6Bv8iwtKgmQu0SAybmF"
          + "RJiz12qXzdvTLt8C75OdgmUomxp0+gW/4XlTPUqOMQWv463aZRv9Ust4f8MH"
          + "EJh4ekP/NS9+d8vEO3P40ntQkmSMcFmtA9E1koUtQ3MSJlcs441JjbgUaVnm"
          + "jDmmniQnZY4bU3tVAgMBAAGjgZowgZcwDAYDVR0TAQH/BAIwADALBgNVHQ8E"
          + "BAMCB4AwEwYDVR0lBAwwCgYIKwYBBQUHAwkwNgYIKwYBBQUHAQEEKjAoMCYG"
          + "CCsGAQUFBzABhhpodHRwOi8vMTcyLjE5LjQwLjExMDo3NzAwLzAtBgNVHR8E"
          + "JjAkMCKgIKAehhxodHRwOi8vMTcyLjE5LjQwLjExMC9jcmwuY3JsMA0GCSqG"
          + "SIb3DQEBBQUAA4IBAQB6FovM3B4VDDZ15o12gnADZsIk9fTAczLlcrmXLNN4"
          + "PgmqgnwF0Ymj3bD5SavDOXxbA65AZJ7rBNAguLUo+xVkgxmoBH7R2sBxjTCc"
          + "r07NEadxM3HQkt0aX5XYEl8eRoifwqYAI9h0ziZfTNes8elNfb3DoPPjqq6V"
          + "mMg0f0iMS4W8LjNPorjRB+kIosa1deAGPhq0eJ8yr0/s2QR2/WFD5P4aXc8I"
          + "KWleklnIImS3zqiPrq6tl2Bm8DZj7vXlTOwmraSQxUwzCKwYob1yGvNOUQTq"
          + "pG6jxn7jgDawHU1+WjWQe4Q34/pWeGLysxTraMa+Ug9kPe+jy/qRX2xwvKBZ");
    
    private boolean isSameAs(
        byte[]  a,
        byte[]  b)
    {
        if (a.length != b.length)
        {
            return false;
        }
        
        for (int i = 0; i != a.length; i++)
        {
            if (a[i] != b[i])
            {
                return false;
            }
        }
        
        return true;
    }
    
    private TestResult unsignedRequest()
    {
        try
        {
            ASN1InputStream aIn = new ASN1InputStream(new ByteArrayInputStream(unsignedReq));
            OCSPRequest     req = OCSPRequest.getInstance(aIn.readObject());
            
            if (!isSameAs(req.getEncoded(), unsignedReq))
            {
                return new SimpleTestResult(false, getName() + ": OCSP unsigned request failed to re-encode");
            }
            
            return new SimpleTestResult(true, getName() + ": Okay");
        }
        catch (Exception e)
        {
            return new SimpleTestResult(false, getName() + ": failed unsigned exception - " + e.toString(), e);
        }
    }
    
    private TestResult signedRequest()
    {
        try
        {
            ASN1InputStream aIn = new ASN1InputStream(new ByteArrayInputStream(signedReq));
            OCSPRequest     req = OCSPRequest.getInstance(aIn.readObject());
            
            if (!isSameAs(req.getEncoded(), signedReq))
            {
                return new SimpleTestResult(false, getName() + ": OCSP signed request failed to re-encode");
            }
            
            return new SimpleTestResult(true, getName() + ": Okay");
        }
        catch (Exception e)
        {
            return new SimpleTestResult(false, getName() + ": failed signed exception - " + e.toString(), e);
        }
    }
    
    private TestResult response()
    {
        try
        {
            ASN1InputStream aIn = new ASN1InputStream(new ByteArrayInputStream(response));
            OCSPResponse    resp = OCSPResponse.getInstance(aIn.readObject());
            ResponseBytes   rBytes = ResponseBytes.getInstance(resp.getResponseBytes());
            
            aIn = new ASN1InputStream(new ByteArrayInputStream(rBytes.getResponse().getOctets()));
            
            BasicOCSPResponse   bResp = BasicOCSPResponse.getInstance(aIn.readObject());
            
            resp = new OCSPResponse(resp.getResponseStatus(), new ResponseBytes(rBytes.getResponseType(), new DEROctetString(bResp.getEncoded())));
            
            if (!isSameAs(resp.getEncoded(), response))
            {
                return new SimpleTestResult(false, getName() + ": OCSP response failed to re-encode");
            }
            
            return new SimpleTestResult(true, getName() + ": Okay");
        }
        catch (Exception e)
        {
            return new SimpleTestResult(false, getName() + ": failed response exception - " + e.toString(), e);
        }
    }

    public TestResult perform()
    {
        TestResult  res = unsignedRequest();
        
        if (!res.isSuccessful())
        {
            return res;
        }
        
        res = signedRequest();
        if (!res.isSuccessful())
        {
            return res;
        }
        
        return response();
    }

    public String getName()
    {
        return "OCSP";
    }

    public static void main(
        String[] args)
    {
        OCSPTest    test = new OCSPTest();
        TestResult      result = test.perform();

        System.out.println(result);
    }
}