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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 1.8 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.cert.ocsp;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.bouncycastle.asn1.ASN1Exception;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ocsp.BasicOCSPResponse;
import org.bouncycastle.asn1.ocsp.OCSPObjectIdentifiers;
import org.bouncycastle.asn1.ocsp.OCSPResponse;
import org.bouncycastle.asn1.ocsp.ResponseBytes;
import org.bouncycastle.cert.CertIOException;

public class OCSPResp
{
    public static final int SUCCESSFUL = 0;  // Response has valid confirmations
    public static final int MALFORMED_REQUEST = 1;  // Illegal confirmation request
    public static final int INTERNAL_ERROR = 2;  // Internal error in issuer
    public static final int TRY_LATER = 3;  // Try again later
    // (4) is not used
    public static final int SIG_REQUIRED = 5;  // Must sign the request
    public static final int UNAUTHORIZED = 6;  // Request unauthorized

    private OCSPResponse    resp;

    public OCSPResp(
        OCSPResponse    resp)
    {
        this.resp = resp;
    }

    public OCSPResp(
        byte[]          resp)
        throws IOException
    {
        this(new ByteArrayInputStream(resp));
    }

    public OCSPResp(
        InputStream resp)
        throws IOException
    {
        this(new ASN1InputStream(resp));
    }

    private OCSPResp(
        ASN1InputStream aIn)
        throws IOException
    {
        try
        {
            this.resp = OCSPResponse.getInstance(aIn.readObject());
        }
        catch (IllegalArgumentException e)
        {
            throw new CertIOException("malformed response: " + e.getMessage(), e);
        }
        catch (ClassCastException e)
        {
            throw new CertIOException("malformed response: " + e.getMessage(), e);
        }
        catch (ASN1Exception e)
        {
            throw new CertIOException("malformed response: " + e.getMessage(), e);
        }

        if (resp == null)
        {
            throw new CertIOException("malformed response: no response data found");
        }
    }

    public int getStatus()
    {
        return this.resp.getResponseStatus().getIntValue();
    }

    public Object getResponseObject()
        throws OCSPException
    {
        ResponseBytes   rb = this.resp.getResponseBytes();

        if (rb == null)
        {
            return null;
        }

        if (rb.getResponseType().equals(OCSPObjectIdentifiers.id_pkix_ocsp_basic))
        {
            try
            {
                ASN1Primitive obj = ASN1Primitive.fromByteArray(rb.getResponse().getOctets());
                return new BasicOCSPResp(BasicOCSPResponse.getInstance(obj));
            }
            catch (Exception e)
            {
                throw new OCSPException("problem decoding object: " + e, e);
            }
        }

        return rb.getResponse();
    }

    /**
     * return the ASN.1 encoded representation of this object.
     */
    public byte[] getEncoded()
        throws IOException
    {
        return resp.getEncoded();
    }
    
    public boolean equals(Object o)
    {
        if (o == this)
        {
            return true;
        }
        
        if (!(o instanceof OCSPResp))
        {
            return false;
        }
        
        OCSPResp r = (OCSPResp)o;
        
        return resp.equals(r.resp);
    }
    
    public int hashCode()
    {
        return resp.hashCode();
    }

    public OCSPResponse toASN1Structure()
    {
        return resp;
    }
}