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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 1.5 and up.
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package org.bouncycastle.x509;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.security.GeneralSecurityException;
import java.security.KeyFactory;
import java.security.PublicKey;
import java.security.cert.CRLException;
import java.security.cert.CertPathValidatorException;
import java.security.cert.CertStore;
import java.security.cert.CertStoreException;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.PKIXParameters;
import java.security.cert.PolicyQualifierInfo;
import java.security.cert.X509CRL;
import java.security.cert.X509CRLEntry;
import java.security.cert.X509Certificate;
import java.security.interfaces.DSAParams;
import java.security.interfaces.DSAPublicKey;
import java.security.spec.DSAPublicKeySpec;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.security.auth.x500.X500Principal;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Enumerated;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1OutputStream;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.CRLReason;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.IssuingDistributionPoint;
import org.bouncycastle.asn1.x509.PolicyInformation;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.asn1.x509.X509Extension;
import org.bouncycastle.jcajce.PKIXCertStoreSelector;
import org.bouncycastle.jce.exception.ExtCertPathValidatorException;
import org.bouncycastle.jce.provider.AnnotatedException;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.jce.provider.PKIXPolicyNode;
import org.bouncycastle.util.Encodable;
import org.bouncycastle.util.Selector;
import org.bouncycastle.util.Store;
import org.bouncycastle.util.StoreException;
class CertPathValidatorUtilities
{
protected static final String CERTIFICATE_POLICIES = Extension.certificatePolicies.getId();
protected static final String BASIC_CONSTRAINTS = Extension.basicConstraints.getId();
protected static final String POLICY_MAPPINGS = Extension.policyMappings.getId();
protected static final String SUBJECT_ALTERNATIVE_NAME = Extension.subjectAlternativeName.getId();
protected static final String NAME_CONSTRAINTS = Extension.nameConstraints.getId();
protected static final String KEY_USAGE = Extension.keyUsage.getId();
protected static final String INHIBIT_ANY_POLICY = Extension.inhibitAnyPolicy.getId();
protected static final String ISSUING_DISTRIBUTION_POINT = Extension.issuingDistributionPoint.getId();
protected static final String DELTA_CRL_INDICATOR = Extension.deltaCRLIndicator.getId();
protected static final String POLICY_CONSTRAINTS = Extension.policyConstraints.getId();
// protected static final String FRESHEST_CRL = Extension.freshestCRL.getId();
// protected static final String CRL_DISTRIBUTION_POINTS = Extension.cRLDistributionPoints.getId();
// protected static final String AUTHORITY_KEY_IDENTIFIER = Extension.authorityKeyIdentifier.getId();
protected static final String CRL_NUMBER = Extension.cRLNumber.getId();
protected static final String ANY_POLICY = "2.5.29.32.0";
/*
* key usage bits
*/
protected static final int KEY_CERT_SIGN = 5;
protected static final int CRL_SIGN = 6;
protected static final String[] crlReasons = new String[]{
"unspecified",
"keyCompromise",
"cACompromise",
"affiliationChanged",
"superseded",
"cessationOfOperation",
"certificateHold",
"unknown",
"removeFromCRL",
"privilegeWithdrawn",
"aACompromise"};
/**
* Returns the issuer of an attribute certificate or certificate.
*
* @param cert The attribute certificate or certificate.
* @return The issuer as X500Principal.
*/
protected static X500Principal getEncodedIssuerPrincipal(
Object cert)
{
if (cert instanceof X509Certificate)
{
return ((X509Certificate)cert).getIssuerX500Principal();
}
else
{
return (X500Principal)((X509AttributeCertificate)cert).getIssuer().getPrincipals()[0];
}
}
protected static Date getValidityDate(PKIXParameters paramsPKIX, Date currentDate)
{
Date validityDate = paramsPKIX.getDate();
return null == validityDate ? currentDate : validityDate;
}
protected static X500Principal getSubjectPrincipal(X509Certificate cert)
{
return cert.getSubjectX500Principal();
}
protected static boolean isSelfIssued(X509Certificate cert)
{
return cert.getSubjectDN().equals(cert.getIssuerDN());
}
/**
* Extract the value of the given extension, if it exists.
*
* @param ext The extension object.
* @param oid The object identifier to obtain.
* @throws AnnotatedException if the extension cannot be read.
*/
protected static ASN1Primitive getExtensionValue(
java.security.cert.X509Extension ext,
String oid)
throws AnnotatedException
{
byte[] bytes = ext.getExtensionValue(oid);
if (bytes == null)
{
return null;
}
return getObject(oid, bytes);
}
private static ASN1Primitive getObject(
String oid,
byte[] ext)
throws AnnotatedException
{
try
{
ASN1InputStream aIn = new ASN1InputStream(ext);
ASN1OctetString octs = (ASN1OctetString)aIn.readObject();
aIn = new ASN1InputStream(octs.getOctets());
return aIn.readObject();
}
catch (Exception e)
{
throw new AnnotatedException("exception processing extension " + oid, e);
}
}
protected static X500Principal getIssuerPrincipal(X509CRL crl)
{
return crl.getIssuerX500Principal();
}
protected static AlgorithmIdentifier getAlgorithmIdentifier(
PublicKey key)
throws CertPathValidatorException
{
try
{
ASN1InputStream aIn = new ASN1InputStream(key.getEncoded());
SubjectPublicKeyInfo info = SubjectPublicKeyInfo.getInstance(aIn.readObject());
return info.getAlgorithmId();
}
catch (Exception e)
{
throw new ExtCertPathValidatorException("Subject public key cannot be decoded.", e);
}
}
// crl checking
//
// policy checking
//
protected static final Set getQualifierSet(ASN1Sequence qualifiers)
throws CertPathValidatorException
{
Set pq = new HashSet();
if (qualifiers == null)
{
return pq;
}
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
ASN1OutputStream aOut = ASN1OutputStream.create(bOut);
Enumeration e = qualifiers.getObjects();
while (e.hasMoreElements())
{
try
{
aOut.writeObject((ASN1Encodable)e.nextElement());
pq.add(new PolicyQualifierInfo(bOut.toByteArray()));
}
catch (IOException ex)
{
throw new ExtCertPathValidatorException("Policy qualifier info cannot be decoded.", ex);
}
bOut.reset();
}
return pq;
}
protected static PKIXPolicyNode removePolicyNode(
PKIXPolicyNode validPolicyTree,
List[] policyNodes,
PKIXPolicyNode _node)
{
PKIXPolicyNode _parent = (PKIXPolicyNode)_node.getParent();
if (validPolicyTree == null)
{
return null;
}
if (_parent == null)
{
for (int j = 0; j < policyNodes.length; j++)
{
policyNodes[j] = new ArrayList();
}
return null;
}
else
{
_parent.removeChild(_node);
removePolicyNodeRecurse(policyNodes, _node);
return validPolicyTree;
}
}
private static void removePolicyNodeRecurse(
List[] policyNodes,
PKIXPolicyNode _node)
{
policyNodes[_node.getDepth()].remove(_node);
if (_node.hasChildren())
{
Iterator _iter = _node.getChildren();
while (_iter.hasNext())
{
PKIXPolicyNode _child = (PKIXPolicyNode)_iter.next();
removePolicyNodeRecurse(policyNodes, _child);
}
}
}
protected static boolean processCertD1i(
int index,
List[] policyNodes,
ASN1ObjectIdentifier pOid,
Set pq)
{
List policyNodeVec = policyNodes[index - 1];
for (int j = 0; j < policyNodeVec.size(); j++)
{
PKIXPolicyNode node = (PKIXPolicyNode)policyNodeVec.get(j);
Set expectedPolicies = node.getExpectedPolicies();
if (expectedPolicies.contains(pOid.getId()))
{
Set childExpectedPolicies = new HashSet();
childExpectedPolicies.add(pOid.getId());
PKIXPolicyNode child = new PKIXPolicyNode(new ArrayList(),
index,
childExpectedPolicies,
node,
pq,
pOid.getId(),
false);
node.addChild(child);
policyNodes[index].add(child);
return true;
}
}
return false;
}
protected static void processCertD1ii(
int index,
List[] policyNodes,
ASN1ObjectIdentifier _poid,
Set _pq)
{
List policyNodeVec = policyNodes[index - 1];
for (int j = 0; j < policyNodeVec.size(); j++)
{
PKIXPolicyNode _node = (PKIXPolicyNode)policyNodeVec.get(j);
if (ANY_POLICY.equals(_node.getValidPolicy()))
{
Set _childExpectedPolicies = new HashSet();
_childExpectedPolicies.add(_poid.getId());
PKIXPolicyNode _child = new PKIXPolicyNode(new ArrayList(),
index,
_childExpectedPolicies,
_node,
_pq,
_poid.getId(),
false);
_node.addChild(_child);
policyNodes[index].add(_child);
return;
}
}
}
protected static void prepareNextCertB1(
int i,
List[] policyNodes,
String id_p,
Map m_idp,
X509Certificate cert
)
throws AnnotatedException, CertPathValidatorException
{
boolean idp_found = false;
Iterator nodes_i = policyNodes[i].iterator();
while (nodes_i.hasNext())
{
PKIXPolicyNode node = (PKIXPolicyNode)nodes_i.next();
if (node.getValidPolicy().equals(id_p))
{
idp_found = true;
node.setExpectedPolicies((Set)m_idp.get(id_p));
break;
}
}
if (!idp_found)
{
nodes_i = policyNodes[i].iterator();
while (nodes_i.hasNext())
{
PKIXPolicyNode node = (PKIXPolicyNode)nodes_i.next();
if (ANY_POLICY.equals(node.getValidPolicy()))
{
Set pq = null;
ASN1Sequence policies = null;
try
{
policies = DERSequence.getInstance(getExtensionValue(cert, CERTIFICATE_POLICIES));
}
catch (Exception e)
{
throw new AnnotatedException("Certificate policies cannot be decoded.", e);
}
Enumeration e = policies.getObjects();
while (e.hasMoreElements())
{
PolicyInformation pinfo = null;
try
{
pinfo = PolicyInformation.getInstance(e.nextElement());
}
catch (Exception ex)
{
throw new AnnotatedException("Policy information cannot be decoded.", ex);
}
if (ANY_POLICY.equals(pinfo.getPolicyIdentifier().getId()))
{
try
{
pq = getQualifierSet(pinfo.getPolicyQualifiers());
}
catch (CertPathValidatorException ex)
{
throw new ExtCertPathValidatorException(
"Policy qualifier info set could not be built.", ex);
}
break;
}
}
boolean ci = false;
if (cert.getCriticalExtensionOIDs() != null)
{
ci = cert.getCriticalExtensionOIDs().contains(CERTIFICATE_POLICIES);
}
PKIXPolicyNode p_node = (PKIXPolicyNode)node.getParent();
if (ANY_POLICY.equals(p_node.getValidPolicy()))
{
PKIXPolicyNode c_node = new PKIXPolicyNode(
new ArrayList(), i,
(Set)m_idp.get(id_p),
p_node, pq, id_p, ci);
p_node.addChild(c_node);
policyNodes[i].add(c_node);
}
break;
}
}
}
}
protected static PKIXPolicyNode prepareNextCertB2(
int i,
List[] policyNodes,
String id_p,
PKIXPolicyNode validPolicyTree)
{
Iterator nodes_i = policyNodes[i].iterator();
while (nodes_i.hasNext())
{
PKIXPolicyNode node = (PKIXPolicyNode)nodes_i.next();
if (node.getValidPolicy().equals(id_p))
{
PKIXPolicyNode p_node = (PKIXPolicyNode)node.getParent();
p_node.removeChild(node);
nodes_i.remove();
for (int k = (i - 1); k >= 0; k--)
{
List nodes = policyNodes[k];
for (int l = 0; l < nodes.size(); l++)
{
PKIXPolicyNode node2 = (PKIXPolicyNode)nodes.get(l);
if (!node2.hasChildren())
{
validPolicyTree = removePolicyNode(validPolicyTree, policyNodes, node2);
if (validPolicyTree == null)
{
break;
}
}
}
}
}
}
return validPolicyTree;
}
protected static boolean isAnyPolicy(
Set policySet)
{
return policySet == null || policySet.contains(ANY_POLICY) || policySet.isEmpty();
}
/**
* Return a Collection of all certificates or attribute certificates found
* in the X509Store's that are matching the certSelect criteriums.
*
* @param certSelect a {@link Selector} object that will be used to select
* the certificates
* @param certStores a List containing only {@link X509Store} objects. These
* are used to search for certificates.
* @return a Collection of all found {@link X509Certificate} or
* {@link org.bouncycastle.x509.X509AttributeCertificate} objects.
* May be empty but never null.
*/
protected static Collection findCertificates(X509CertStoreSelector certSelect,
List certStores)
throws AnnotatedException
{
Set certs = new HashSet();
Iterator iter = certStores.iterator();
org.bouncycastle.jcajce.provider.asymmetric.x509.CertificateFactory certFact = new org.bouncycastle.jcajce.provider.asymmetric.x509.CertificateFactory();
while (iter.hasNext())
{
Object obj = iter.next();
if (obj instanceof Store)
{
Store certStore = (Store)obj;
try
{
for (Iterator it = certStore.getMatches(certSelect).iterator(); it.hasNext();)
{
Object cert = it.next();
if (cert instanceof Encodable)
{
certs.add(certFact.engineGenerateCertificate(new ByteArrayInputStream(((Encodable)cert).getEncoded())));
}
else if (cert instanceof Certificate)
{
certs.add(cert);
}
else
{
throw new AnnotatedException(
"Unknown object found in certificate store.");
}
}
}
catch (StoreException e)
{
throw new AnnotatedException(
"Problem while picking certificates from X.509 store.", e);
}
catch (IOException e)
{
throw new AnnotatedException(
"Problem while extracting certificates from X.509 store.", e);
}
catch (CertificateException e)
{
throw new AnnotatedException(
"Problem while extracting certificates from X.509 store.", e);
}
}
else
{
CertStore certStore = (CertStore)obj;
try
{
certs.addAll(certStore.getCertificates(certSelect));
}
catch (CertStoreException e)
{
throw new AnnotatedException(
"Problem while picking certificates from certificate store.",
e);
}
}
}
return certs;
}
protected static Collection findCertificates(PKIXCertStoreSelector certSelect,
List certStores)
throws AnnotatedException
{
Set certs = new HashSet();
Iterator iter = certStores.iterator();
while (iter.hasNext())
{
Object obj = iter.next();
if (obj instanceof Store)
{
Store certStore = (Store)obj;
try
{
certs.addAll(certStore.getMatches(certSelect));
}
catch (StoreException e)
{
throw new AnnotatedException(
"Problem while picking certificates from X.509 store.", e);
}
}
else
{
CertStore certStore = (CertStore)obj;
try
{
certs.addAll(PKIXCertStoreSelector.getCertificates(certSelect, certStore));
}
catch (CertStoreException e)
{
throw new AnnotatedException(
"Problem while picking certificates from certificate store.",
e);
}
}
}
return certs;
}
protected static Collection findCertificates(X509AttributeCertStoreSelector certSelect,
List certStores)
throws AnnotatedException
{
Set certs = new HashSet();
Iterator iter = certStores.iterator();
while (iter.hasNext())
{
Object obj = iter.next();
if (obj instanceof X509Store)
{
X509Store certStore = (X509Store)obj;
try
{
certs.addAll(certStore.getMatches(certSelect));
}
catch (StoreException e)
{
throw new AnnotatedException(
"Problem while picking certificates from X.509 store.", e);
}
}
}
return certs;
}
private static BigInteger getSerialNumber(
Object cert)
{
if (cert instanceof X509Certificate)
{
return ((X509Certificate)cert).getSerialNumber();
}
else
{
return ((X509AttributeCertificate)cert).getSerialNumber();
}
}
protected static void getCertStatus(
Date validDate,
X509CRL crl,
Object cert,
CertStatus certStatus)
throws AnnotatedException
{
X509CRLEntry crl_entry = null;
boolean isIndirect;
try
{
isIndirect = isIndirectCRL(crl);
}
catch (CRLException exception)
{
throw new AnnotatedException("Failed check for indirect CRL.", exception);
}
if (isIndirect)
{
crl_entry = crl.getRevokedCertificate(getSerialNumber(cert));
if (crl_entry == null)
{
return;
}
X500Principal certIssuer = crl_entry.getCertificateIssuer();
if (certIssuer == null)
{
certIssuer = getIssuerPrincipal(crl);
}
if (!getEncodedIssuerPrincipal(cert).equals(certIssuer))
{
return;
}
}
else if (!getEncodedIssuerPrincipal(cert).equals(getIssuerPrincipal(crl)))
{
return; // not for our issuer, ignore
}
else
{
crl_entry = crl.getRevokedCertificate(getSerialNumber(cert));
if (crl_entry == null)
{
return;
}
}
ASN1Enumerated reasonCode = null;
if (crl_entry.hasExtensions())
{
try
{
reasonCode = ASN1Enumerated
.getInstance(CertPathValidatorUtilities
.getExtensionValue(crl_entry,
X509Extension.reasonCode.getId()));
}
catch (Exception e)
{
throw new AnnotatedException(
"Reason code CRL entry extension could not be decoded.",
e);
}
}
int reasonCodeValue = (null == reasonCode)
? CRLReason.unspecified
: reasonCode.intValueExact();
// for reason keyCompromise, caCompromise, aACompromise or unspecified
if (!(validDate.getTime() < crl_entry.getRevocationDate().getTime())
|| reasonCodeValue == CRLReason.unspecified
|| reasonCodeValue == CRLReason.keyCompromise
|| reasonCodeValue == CRLReason.cACompromise
|| reasonCodeValue == CRLReason.aACompromise)
{
// (i) or (j)
certStatus.setCertStatus(reasonCodeValue);
certStatus.setRevocationDate(crl_entry.getRevocationDate());
}
}
/**
* Return the next working key inheriting DSA parameters if necessary.
*
* This methods inherits DSA parameters from the indexed certificate or
* previous certificates in the certificate chain to the returned
* PublicKey. The list is searched upwards, meaning the end
* certificate is at position 0 and previous certificates are following.
*
*
* If the indexed certificate does not contain a DSA key this method simply
* returns the public key. If the DSA key already contains DSA parameters
* the key is also only returned.
*
*
* @param certs The certification path.
* @param index The index of the certificate which contains the public key
* which should be extended with DSA parameters.
* @return The public key of the certificate in list position
* index extended with DSA parameters if applicable.
* @throws CertPathValidatorException if DSA parameters cannot be inherited.
*/
protected static PublicKey getNextWorkingKey(List certs, int index)
throws CertPathValidatorException
{
Certificate cert = (Certificate)certs.get(index);
PublicKey pubKey = cert.getPublicKey();
if (!(pubKey instanceof DSAPublicKey))
{
return pubKey;
}
DSAPublicKey dsaPubKey = (DSAPublicKey)pubKey;
if (dsaPubKey.getParams() != null)
{
return dsaPubKey;
}
for (int i = index + 1; i < certs.size(); i++)
{
X509Certificate parentCert = (X509Certificate)certs.get(i);
pubKey = parentCert.getPublicKey();
if (!(pubKey instanceof DSAPublicKey))
{
throw new CertPathValidatorException(
"DSA parameters cannot be inherited from previous certificate.");
}
DSAPublicKey prevDSAPubKey = (DSAPublicKey)pubKey;
if (prevDSAPubKey.getParams() == null)
{
continue;
}
DSAParams dsaParams = prevDSAPubKey.getParams();
DSAPublicKeySpec dsaPubKeySpec = new DSAPublicKeySpec(
dsaPubKey.getY(), dsaParams.getP(), dsaParams.getQ(), dsaParams.getG());
try
{
KeyFactory keyFactory = KeyFactory.getInstance("DSA", BouncyCastleProvider.PROVIDER_NAME);
return keyFactory.generatePublic(dsaPubKeySpec);
}
catch (Exception exception)
{
throw new RuntimeException(exception.getMessage());
}
}
throw new CertPathValidatorException("DSA parameters cannot be inherited from previous certificate.");
}
protected static void verifyX509Certificate(X509Certificate cert, PublicKey publicKey,
String sigProvider)
throws GeneralSecurityException
{
if (sigProvider == null)
{
cert.verify(publicKey);
}
else
{
cert.verify(publicKey, sigProvider);
}
}
static boolean isIndirectCRL(X509CRL crl)
throws CRLException
{
try
{
byte[] idp = crl.getExtensionValue(Extension.issuingDistributionPoint.getId());
return idp != null
&& IssuingDistributionPoint.getInstance(ASN1OctetString.getInstance(idp).getOctets()).isIndirectCRL();
}
catch (Exception e)
{
throw new CRLException(
"Exception reading IssuingDistributionPoint: " + e);
}
}
}
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