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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.6.
package org.bouncycastle.ocsp;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.InvalidAlgorithmParameterException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PublicKey;
import java.security.Signature;
import java.security.cert.CertStore;
import java.security.cert.CertStoreParameters;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.CollectionCertStoreParameters;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1OutputStream;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERObjectIdentifier;
import org.bouncycastle.asn1.ocsp.OCSPRequest;
import org.bouncycastle.asn1.ocsp.Request;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.asn1.x509.X509Extension;
import org.bouncycastle.asn1.x509.X509Extensions;
/**
*
* 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
implements java.security.cert.X509Extension
{
private OCSPRequest req;
public OCSPReq(
OCSPRequest req)
{
this.req = req;
}
public OCSPReq(
byte[] req)
throws IOException
{
this(new ASN1InputStream(req));
}
public OCSPReq(
InputStream in)
throws IOException
{
this(new ASN1InputStream(in));
}
private OCSPReq(
ASN1InputStream aIn)
throws IOException
{
try
{
this.req = OCSPRequest.getInstance(aIn.readObject());
}
catch (IllegalArgumentException e)
{
throw new IOException("malformed request: " + e.getMessage());
}
catch (ClassCastException e)
{
throw new IOException("malformed request: " + e.getMessage());
}
}
/**
* Return the DER encoding of the tbsRequest field.
* @return DER encoding of tbsRequest
* @throws OCSPException in the event of an encoding error.
*/
public byte[] getTBSRequest()
throws OCSPException
{
try
{
return req.getTbsRequest().getEncoded();
}
catch (IOException e)
{
throw new OCSPException("problem encoding tbsRequest", e);
}
}
public int getVersion()
{
return req.getTbsRequest().getVersion().getValue().intValue() + 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 X509Extensions getRequestExtensions()
{
return X509Extensions.getInstance(req.getTbsRequest().getRequestExtensions());
}
/**
* return the object identifier representing the signature algorithm
*/
public String getSignatureAlgOID()
{
if (!this.isSigned())
{
return null;
}
return req.getOptionalSignature().getSignatureAlgorithm().getObjectId().getId();
}
public byte[] getSignature()
{
if (!this.isSigned())
{
return null;
}
return req.getOptionalSignature().getSignature().getBytes();
}
private List getCertList(
String provider)
throws OCSPException, NoSuchProviderException
{
List certs = new ArrayList();
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
ASN1OutputStream aOut = new ASN1OutputStream(bOut);
CertificateFactory cf;
try
{
cf = OCSPUtil.createX509CertificateFactory(provider);
}
catch (CertificateException ex)
{
throw new OCSPException("can't get certificate factory.", ex);
}
//
// load the certificates if we have any
//
ASN1Sequence s = req.getOptionalSignature().getCerts();
if (s != null)
{
Enumeration e = s.getObjects();
while (e.hasMoreElements())
{
try
{
aOut.writeObject(e.nextElement());
certs.add(cf.generateCertificate(
new ByteArrayInputStream(bOut.toByteArray())));
}
catch (IOException ex)
{
throw new OCSPException(
"can't re-encode certificate!", ex);
}
catch (CertificateException ex)
{
throw new OCSPException(
"can't re-encode certificate!", ex);
}
bOut.reset();
}
}
return certs;
}
public X509Certificate[] getCerts(
String provider)
throws OCSPException, NoSuchProviderException
{
if (!this.isSigned())
{
return null;
}
List certs = this.getCertList(provider);
return (X509Certificate[])certs.toArray(new X509Certificate[certs.size()]);
}
/**
* If the request is signed return a possibly empty CertStore containing the certificates in the
* request. If the request is not signed the method returns null.
*
* @param type type of CertStore to return
* @param provider provider to use
* @return null if not signed, a CertStore otherwise
* @throws NoSuchAlgorithmException
* @throws NoSuchProviderException
* @throws OCSPException
*/
public CertStore getCertificates(
String type,
String provider)
throws NoSuchAlgorithmException, NoSuchProviderException, OCSPException
{
if (!this.isSigned())
{
return null;
}
try
{
CertStoreParameters params = new CollectionCertStoreParameters(this.getCertList(provider));
return OCSPUtil.createCertStoreInstance(type, params, provider);
}
catch (InvalidAlgorithmParameterException e)
{
throw new OCSPException("can't setup the CertStore", e);
}
}
/**
* 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 verify(
PublicKey key,
String sigProvider)
throws OCSPException, NoSuchProviderException
{
if (!this.isSigned())
{
throw new OCSPException("attempt to verify signature on unsigned object");
}
try
{
Signature signature = OCSPUtil.createSignatureInstance(this.getSignatureAlgOID(), sigProvider);
signature.initVerify(key);
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
ASN1OutputStream aOut = new ASN1OutputStream(bOut);
aOut.writeObject(req.getTbsRequest());
signature.update(bOut.toByteArray());
return signature.verify(this.getSignature());
}
catch (NoSuchProviderException e)
{
// TODO Why this special case?
throw e;
}
catch (Exception e)
{
throw new OCSPException("exception processing sig: " + e, e);
}
}
/**
* return the ASN.1 encoded representation of this object.
*/
public byte[] getEncoded()
throws IOException
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
ASN1OutputStream aOut = new ASN1OutputStream(bOut);
aOut.writeObject(req);
return bOut.toByteArray();
}
/**
* RFC 2650 doesn't specify any critical extensions so we return true
* if any are encountered.
*
* @return true if any critical extensions are present.
*/
public boolean hasUnsupportedCriticalExtension()
{
Set extns = getCriticalExtensionOIDs();
if (extns != null && !extns.isEmpty())
{
return true;
}
return false;
}
private Set getExtensionOIDs(boolean critical)
{
Set set = new HashSet();
X509Extensions extensions = this.getRequestExtensions();
if (extensions != null)
{
Enumeration e = extensions.oids();
while (e.hasMoreElements())
{
DERObjectIdentifier oid = (DERObjectIdentifier)e.nextElement();
X509Extension ext = extensions.getExtension(oid);
if (critical == ext.isCritical())
{
set.add(oid.getId());
}
}
}
return set;
}
public Set getCriticalExtensionOIDs()
{
return getExtensionOIDs(true);
}
public Set getNonCriticalExtensionOIDs()
{
return getExtensionOIDs(false);
}
public byte[] getExtensionValue(String oid)
{
X509Extensions exts = this.getRequestExtensions();
if (exts != null)
{
X509Extension ext = exts.getExtension(new DERObjectIdentifier(oid));
if (ext != null)
{
try
{
return ext.getValue().getEncoded(ASN1Encodable.DER);
}
catch (Exception e)
{
throw new RuntimeException("error encoding " + e.toString());
}
}
}
return null;
}
}