libcore/security/src/main/java/org/apache/harmony/security/provider/cert/X509CertImpl.java - platform/dalvik - Git at Google

 /*
  *  Licensed to the Apache Software Foundation (ASF) under one or more
  *  contributor license agreements.  See the NOTICE file distributed with
  *  this work for additional information regarding copyright ownership.
  *  The ASF licenses this file to You under the Apache License, Version 2.0
  *  (the "License"); you may not use this file except in compliance with
  *  the License.  You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS,
  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
  */

 /**
 * @author Alexander Y. Kleymenov
 * @version $Revision$
 */

 package org.apache.harmony.security.provider.cert;

 import java.io.IOException;
 import java.io.InputStream;
 import java.math.BigInteger;
 import java.security.InvalidKeyException;
 import java.security.NoSuchAlgorithmException;
 import java.security.NoSuchProviderException;
 import java.security.Principal;
 import java.security.PublicKey;
 import java.security.Signature;
 import java.security.SignatureException;
 import java.security.cert.CertificateEncodingException;
 import java.security.cert.CertificateException;
 import java.security.cert.CertificateExpiredException;
 import java.security.cert.CertificateNotYetValidException;
 import java.security.cert.CertificateParsingException;
 import java.security.cert.X509Certificate;
 import java.util.Collection;
 import java.util.Date;
 import java.util.List;
 import java.util.Set;

 import javax.security.auth.x500.X500Principal;

 import org.apache.harmony.security.internal.nls.Messages;
 import org.apache.harmony.security.utils.AlgNameMapper;
 import org.apache.harmony.security.x509.Certificate;
 import org.apache.harmony.security.x509.Extension;
 import org.apache.harmony.security.x509.Extensions;
 import org.apache.harmony.security.x509.TBSCertificate;

 // BEGIN android-added
 import java.security.interfaces.RSAPublicKey;
 import org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl;
 // END android-added

 /**
  * This class is an implementation of X509Certificate. It wraps
  * the instance of org.apache.harmony.security.x509.Certificate
  * built on the base of provided ASN.1 DER encoded form of
  * Certificate structure (as specified in RFC 3280
  * http://www.ietf.org/rfc/rfc3280.txt).
  * @see org.apache.harmony.security.x509.Certificate
  * @see java.security.cert.X509Certificate
  */
 public class X509CertImpl extends X509Certificate {

     /**
      * @serial
      */
     private static final long serialVersionUID = 2972248729446736154L;

     // the core object to be wrapped in X509Certificate
     private final Certificate certificate;

     // to speed up access to the info, the following fields
     // cache values retrieved from the certificate object
     private final TBSCertificate tbsCert;
     private final Extensions extensions;
     private long notBefore = -1;
     private long notAfter;
     private BigInteger serialNumber;
     private X500Principal issuer;
     private X500Principal subject;
     private byte[] tbsCertificate;
     private byte[] signature;
     private String sigAlgName;
     private String sigAlgOID;
     private byte[] sigAlgParams;
     // indicates whether the signature algorithm parameters are null
     private boolean nullSigAlgParams;
     private PublicKey publicKey;

     // encoding of the certificate
 // BEGIN android-changed
     private volatile byte[] encoding;
 // END android-changed

     //
     // ---------------------- Constructors -------------------------------
     //

     /**
      * Constructs the instance on the base of ASN.1 encoded
      * form of X.509 certificate provided via stream parameter.
      * @param in input stream containing ASN.1 encoded form of certificate.
      * @throws CertificateException if some decoding problems occur.
      */
     public X509CertImpl(InputStream in) throws CertificateException {
         try {
             // decode the Certificate object
             this.certificate = (Certificate) Certificate.ASN1.decode(in);
             // cache the values of TBSCertificate and Extensions
             this.tbsCert = certificate.getTbsCertificate();
             this.extensions = tbsCert.getExtensions();
         } catch (IOException e) {
             throw new CertificateException(e);
         }
     }

     /**
      * Constructs the instance on the base of existing Certificate object to
      * be wrapped.
      */
     public X509CertImpl(Certificate certificate) {
         this.certificate = certificate;
         // cache the values of TBSCertificate and Extensions
         this.tbsCert = certificate.getTbsCertificate();
         this.extensions = tbsCert.getExtensions();
     }

     /**
      * Constructs the instance on the base of ASN.1 encoded
      * form of X.509 certificate provided via array of bytes.
      * @param encoding byte array containing ASN.1 encoded form of certificate.
      * @throws IOException if some decoding problems occur.
      */
     public X509CertImpl(byte[] encoding) throws IOException {
         this((Certificate) Certificate.ASN1.decode(encoding));
     }

     //
     // ----------------- Public methods implementations ------------------
     //

     /**
      * @see java.security.cert.X509Certificate#checkValidity()
      * method documentation for more information.
      */
     public void checkValidity() throws CertificateExpiredException,
                                        CertificateNotYetValidException {
         if (notBefore == -1) {
             // retrieve and cache the value of validity period
             notBefore = tbsCert.getValidity().getNotBefore().getTime();
             notAfter = tbsCert.getValidity().getNotAfter().getTime();
         }
         long time = System.currentTimeMillis();
         if (time < notBefore) {
             throw new CertificateNotYetValidException();
         }
         if (time > notAfter) {
             throw new CertificateExpiredException();
         }
     }

     /**
      * @see java.security.cert.X509Certificate#checkValidity(Date)
      * method documentation for more information.
      */
     public void checkValidity(Date date)
                                 throws CertificateExpiredException,
                                        CertificateNotYetValidException {
         if (notBefore == -1) {
             // retrieve and cache the value of validity period
             notBefore = tbsCert.getValidity().getNotBefore().getTime();
             notAfter = tbsCert.getValidity().getNotAfter().getTime();
         }
         long time = date.getTime();
         if (time < notBefore) {
             // BEGIN android-changed
             throw new CertificateNotYetValidException("current time: " + date
                 + ", validation time: " + new Date(notBefore));
             // END android-changed
         }
         if (time > notAfter) {
             // BEGIN android-changed
             throw new CertificateExpiredException("current time: " + date
                 + ", expiration time: " + new Date(notAfter));
             // END android-changed
         }
     }

     /**
      * @see java.security.cert.X509Certificate#getVersion()
      * method documentation for more information.
      */
     public int getVersion() {
         return tbsCert.getVersion() + 1;
     }

     /**
      * @see java.security.cert.X509Certificate#getSerialNumber()
      * method documentation for more information.
      */
     public BigInteger getSerialNumber() {
         if (serialNumber == null) {
             serialNumber = tbsCert.getSerialNumber();
         }
         return serialNumber;
     }

     /**
      * @see java.security.cert.X509Certificate#getIssuerDN()
      * method documentation for more information.
      */
     public Principal getIssuerDN() {
         if (issuer == null) {
             // retrieve the issuer's principal
             issuer = tbsCert.getIssuer().getX500Principal();
         }
         return issuer;
     }

     /**
      * @see java.security.cert.X509Certificate#getIssuerX500Principal()
      * method documentation for more information.
      */
     public X500Principal getIssuerX500Principal() {
         if (issuer == null) {
             // retrieve the issuer's principal
             issuer = tbsCert.getIssuer().getX500Principal();
         }
         return issuer;
     }

     /**
      * @see java.security.cert.X509Certificate#getSubjectDN()
      * method documentation for more information.
      */
     public Principal getSubjectDN() {
         if (subject == null) {
             // retrieve the subject's principal
             subject = tbsCert.getSubject().getX500Principal();
         }
         return subject;
     }

     /**
      * @see java.security.cert.X509Certificate#getSubjectX500Principal()
      * method documentation for more information.
      */
     public X500Principal getSubjectX500Principal() {
         if (subject == null) {
             // retrieve the subject's principal
             subject = tbsCert.getSubject().getX500Principal();
         }
         return subject;
     }

     /**
      * @see java.security.cert.X509Certificate#getNotBefore()
      * method documentation for more information.
      */
     public Date getNotBefore() {
         if (notBefore == -1) {
             // the value was not retrieved from the certificate, do it:
             notBefore = tbsCert.getValidity().getNotBefore().getTime();
             notAfter = tbsCert.getValidity().getNotAfter().getTime();
         }
         return new Date(notBefore);
     }

     /**
      * @see java.security.cert.X509Certificate#getNotAfter()
      * method documentation for more information.
      */
     public Date getNotAfter() {
         if (notBefore == -1) {
             // the value was not retrieved from the certificate, do it:
             notBefore = tbsCert.getValidity().getNotBefore().getTime();
             notAfter = tbsCert.getValidity().getNotAfter().getTime();
         }
         return new Date(notAfter);
     }

     /**
      * @see java.security.cert.X509Certificate#getTBSCertificate()
      * method documentation for more information.
      */
     public byte[] getTBSCertificate()
                         throws CertificateEncodingException {
         if (tbsCertificate == null) {
             // retrieve the encoded form of the TBSCertificate structure
             tbsCertificate = tbsCert.getEncoded();
         }
         byte[] result = new byte[tbsCertificate.length];
         System.arraycopy(tbsCertificate, 0, result, 0, tbsCertificate.length);
         return result;
     }

     /**
      * @see java.security.cert.X509Certificate#getSignature()
      * method documentation for more information.
      */
     public byte[] getSignature() {
         if (signature == null) {
             // retrieve the value of the signature
             signature = certificate.getSignatureValue();
         }
         byte[] result = new byte[signature.length];
         System.arraycopy(signature, 0, result, 0, signature.length);
         return result;
     }

     /**
      * @see java.security.cert.X509Certificate#getSigAlgName()
      * method documentation for more information.
      */
     public String getSigAlgName() {
         if (sigAlgOID == null) {
             // if info was not retrieved (and cached), do it:
             sigAlgOID = tbsCert.getSignature().getAlgorithm();
             // retrieve the name of the signing algorithm
             sigAlgName = AlgNameMapper.map2AlgName(sigAlgOID);
             if (sigAlgName == null) {
                 // if could not be found, use OID as a name
                 sigAlgName = sigAlgOID;
             }
         }
         return sigAlgName;
     }

     /**
      * @see java.security.cert.X509Certificate#getSigAlgOID()
      * method documentation for more information.
      */
     public String getSigAlgOID() {
         if (sigAlgOID == null) {
             // if info was not retrieved (and cached), do it:
             sigAlgOID = tbsCert.getSignature().getAlgorithm();
             // retrieve the name of the signing algorithm
             sigAlgName = AlgNameMapper.map2AlgName(sigAlgOID);
             if (sigAlgName == null) {
                 // if could not be found, use OID as a name
                 sigAlgName = sigAlgOID;
             }
         }
         return sigAlgOID;
     }

     /**
      * @see java.security.cert.X509Certificate#getSigAlgParams()
      * method documentation for more information.
      */
     public byte[] getSigAlgParams() {
         if (nullSigAlgParams) {
             return null;
         }
         if (sigAlgParams == null) {
             sigAlgParams = tbsCert.getSignature().getParameters();
             if (sigAlgParams == null) {
                 nullSigAlgParams = true;
                 return null;
             }
         }
         return sigAlgParams;
     }

     /**
      * @see java.security.cert.X509Certificate#getIssuerUniqueID()
      * method documentation for more information.
      */
     public boolean[] getIssuerUniqueID() {
         return tbsCert.getIssuerUniqueID();
     }

     /**
      * @see java.security.cert.X509Certificate#getSubjectUniqueID()
      * method documentation for more information.
      */
     public boolean[] getSubjectUniqueID() {
         return tbsCert.getSubjectUniqueID();
     }

     /**
      * @see java.security.cert.X509Certificate#getKeyUsage()
      * method documentation for more information.
      */
     public boolean[] getKeyUsage() {
         if (extensions == null) {
             return null;
         }
         return extensions.valueOfKeyUsage();
     }

     /**
      * @see java.security.cert.X509Certificate#getExtendedKeyUsage()
      * method documentation for more information.
      */
     public List/*<String>*/ getExtendedKeyUsage()
                                 throws CertificateParsingException {
         if (extensions == null) {
             return null;
         }
         try {
             return extensions.valueOfExtendedKeyUsage();
         } catch (IOException e) {
             throw new CertificateParsingException(e);
         }
     }

     /**
      * @see java.security.cert.X509Certificate#getBasicConstraints()
      * method documentation for more information.
      */
     public int getBasicConstraints() {
         if (extensions == null) {
             return Integer.MAX_VALUE;
         }
         return extensions.valueOfBasicConstrains();
     }

     /**
      * @see java.security.cert.X509Certificate#getSubjectAlternativeNames()
      * method documentation for more information.
      */
     public Collection/*<List<?>>*/ getSubjectAlternativeNames()
                                 throws CertificateParsingException {
         if (extensions == null) {
             return null;
         }
         try {
             // Retrieve the extension value from the cached extensions object
             // This extension is not checked for correctness during
             // certificate generation, so now it can throw exception
             return extensions.valueOfSubjectAlternativeName();
         } catch (IOException e) {
             throw new CertificateParsingException(e);
         }
     }

     /**
      * @see java.security.cert.X509Certificate#getIssuerAlternativeNames()
      * method documentation for more information.
      */
     public Collection/*FIXME <List<?>>*/ getIssuerAlternativeNames()
                                 throws CertificateParsingException {
         if (extensions == null) {
             return null;
         }
         try {
             // Retrieve the extension value from the cached extensions object
             // This extension is not checked for correctness during
             // certificate generation, so now it can throw exception
             return extensions.valueOfIssuerAlternativeName();
         } catch (IOException e) {
             throw new CertificateParsingException(e);
         }
     }

     //
     // ----- java.security.cert.Certificate methods implementations ------
     //

     /**
      * @see java.security.cert.Certificate#getEncoded()
      * method documentation for more information.
      */
     public byte[] getEncoded() throws CertificateEncodingException {
         if (encoding == null) {
             encoding = certificate.getEncoded();
         }
         byte[] result = new byte[encoding.length];
         System.arraycopy(encoding, 0, result, 0, encoding.length);
         return result;
     }

     /**
      * @see java.security.cert.Certificate#getPublicKey()
      * method documentation for more information.
      */
     public PublicKey getPublicKey() {
         if (publicKey == null) {
             // retrieve the public key from SubjectPublicKeyInfo
             // substructure of X.509 certificate
             publicKey = tbsCert.getSubjectPublicKeyInfo().getPublicKey();
         }
         return publicKey;
     }

     /**
      * @see java.security.cert.Certificate#toString()
      * method documentation for more information.
      */
     public String toString() {
         return certificate.toString();
     }

     /**
      * Verifies the signature of the certificate.
      * @see java.security.cert.Certificate#verify(PublicKey)
      * method documentation for more information.
      */
     public void verify(PublicKey key)
                          throws CertificateException, NoSuchAlgorithmException,
                                 InvalidKeyException, NoSuchProviderException,
                                 SignatureException {

         // BEGIN android-added
         if (getSigAlgName().endsWith("withRSA")) {
             fastVerify(key);
             return;
         }
         // END android-added

         Signature signature = Signature.getInstance(getSigAlgName());
         signature.initVerify(key);
         // retrieve the encoding of the TBSCertificate structure
         if (tbsCertificate == null) {
             tbsCertificate = tbsCert.getEncoded();
         }
         // compute and verify the signature
         signature.update(tbsCertificate, 0, tbsCertificate.length);
         if (!signature.verify(certificate.getSignatureValue())) {
             throw new SignatureException(Messages.getString("security.15C")); //$NON-NLS-1$
         }
     }

     /**
      * Verifies the signature of the certificate.
      * @see java.security.cert.Certificate#verify(PublicKey,String)
      * method documentation for more information.
      */
     public void verify(PublicKey key, String sigProvider)
                          throws CertificateException, NoSuchAlgorithmException,
                                 InvalidKeyException, NoSuchProviderException,
                                 SignatureException {

         // BEGIN android-added
         if (getSigAlgName().endsWith("withRSA")) {
             fastVerify(key);
             return;
         }
         // END android-added

         Signature signature =
             Signature.getInstance(getSigAlgName(), sigProvider);
         signature.initVerify(key);
         // retrieve the encoding of the TBSCertificate structure
         if (tbsCertificate == null) {
             tbsCertificate = tbsCert.getEncoded();
         }
         // compute and verify the signature
         signature.update(tbsCertificate, 0, tbsCertificate.length);
         if (!signature.verify(certificate.getSignatureValue())) {
             throw new SignatureException(Messages.getString("security.15C")); //$NON-NLS-1$
         }
     }

     // BEGIN android-added
     /**
      * Implements a faster RSA verification method that delegates to OpenSSL
      * native code. In all other aspects it behaves just like the ordinary
      * {@link verify} method.
      *
      * @param key The RSA public key to use
      *
      * @throws SignatureException If the verification fails.
      * @throws InvalidKeyException
      */
     private void fastVerify(PublicKey key) throws SignatureException,
             InvalidKeyException, NoSuchAlgorithmException {
         if (!(key instanceof RSAPublicKey)) {
             throw new InvalidKeyException(Messages.getString("security.15C1"));
         }
         RSAPublicKey rsaKey = (RSAPublicKey) key;

         String algorithm = getSigAlgName();

         // We don't support MD2 anymore. This needs to also check for aliases
         // and OIDs.
         if ("MD2withRSA".equalsIgnoreCase(algorithm) ||
                 "MD2withRSAEncryption".equalsIgnoreCase(algorithm) ||
                 "1.2.840.113549.1.1.2".equalsIgnoreCase(algorithm) ||
                 "MD2/RSA".equalsIgnoreCase(algorithm)) {
             throw new NoSuchAlgorithmException(algorithm);
         }

         int i = algorithm.indexOf("with");
         algorithm = algorithm.substring(i + 4) + "-" + algorithm.substring(0, i);

         if (tbsCertificate == null) {
             tbsCertificate = tbsCert.getEncoded();
         }

         byte[] sig = certificate.getSignatureValue();
         if (!OpenSSLSocketImpl.verifySignature(tbsCertificate, sig, algorithm, rsaKey)) {
             throw new SignatureException(Messages.getString("security.15C")); //$NON-NLS-1$
         }
     }
     // END android-added

     //
     // ----- java.security.cert.X509Extension methods implementations ----
     //

     /**
      * @see java.security.cert.X509Extension#getNonCriticalExtensionOIDs()
      * method documentation for more information.
      */
     public Set getNonCriticalExtensionOIDs() {
         if (extensions == null) {
             return null;
         }
         // retrieve the info from the cached extensions object
         return extensions.getNonCriticalExtensions();
     }

     /**
      * @see java.security.cert.X509Extension#getCriticalExtensionOIDs()
      * method documentation for more information.
      */
     public Set getCriticalExtensionOIDs() {
         if (extensions == null) {
             return null;
         }
         // retrieve the info from the cached extensions object
         return extensions.getCriticalExtensions();
     }

     /**
      * @see java.security.cert.X509Extension#getExtensionValue(String)
      * method documentation for more information.
      */
     public byte[] getExtensionValue(String oid) {
         if (extensions == null) {
             return null;
         }
         // retrieve the info from the cached extensions object
         Extension ext = extensions.getExtensionByOID(oid);
         return (ext == null) ? null : ext.getRawExtnValue();
     }

     /**
      * @see java.security.cert.X509Extension#hasUnsupportedCriticalExtension()
      * method documentation for more information.
      */
     public boolean hasUnsupportedCriticalExtension() {
         if (extensions == null) {
             return false;
         }
         // retrieve the info from the cached extensions object
         return extensions.hasUnsupportedCritical();
     }

 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	/**
	* @author Alexander Y. Kleymenov
	* @version $Revision$
	*/

	package org.apache.harmony.security.provider.cert;

	import java.io.IOException;
	import java.io.InputStream;
	import java.math.BigInteger;
	import java.security.InvalidKeyException;
	import java.security.NoSuchAlgorithmException;
	import java.security.NoSuchProviderException;
	import java.security.Principal;
	import java.security.PublicKey;
	import java.security.Signature;
	import java.security.SignatureException;
	import java.security.cert.CertificateEncodingException;
	import java.security.cert.CertificateException;
	import java.security.cert.CertificateExpiredException;
	import java.security.cert.CertificateNotYetValidException;
	import java.security.cert.CertificateParsingException;
	import java.security.cert.X509Certificate;
	import java.util.Collection;
	import java.util.Date;
	import java.util.List;
	import java.util.Set;

	import javax.security.auth.x500.X500Principal;

	import org.apache.harmony.security.internal.nls.Messages;
	import org.apache.harmony.security.utils.AlgNameMapper;
	import org.apache.harmony.security.x509.Certificate;
	import org.apache.harmony.security.x509.Extension;
	import org.apache.harmony.security.x509.Extensions;
	import org.apache.harmony.security.x509.TBSCertificate;

	// BEGIN android-added
	import java.security.interfaces.RSAPublicKey;
	import org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl;
	// END android-added

	/**
	* This class is an implementation of X509Certificate. It wraps
	* the instance of org.apache.harmony.security.x509.Certificate
	* built on the base of provided ASN.1 DER encoded form of
	* Certificate structure (as specified in RFC 3280
	* http://www.ietf.org/rfc/rfc3280.txt).
	* @see org.apache.harmony.security.x509.Certificate
	* @see java.security.cert.X509Certificate
	*/
	public class X509CertImpl extends X509Certificate {

	/**
	* @serial
	*/
	private static final long serialVersionUID = 2972248729446736154L;

	// the core object to be wrapped in X509Certificate
	private final Certificate certificate;

	// to speed up access to the info, the following fields
	// cache values retrieved from the certificate object
	private final TBSCertificate tbsCert;
	private final Extensions extensions;
	private long notBefore = -1;
	private long notAfter;
	private BigInteger serialNumber;
	private X500Principal issuer;
	private X500Principal subject;
	private byte[] tbsCertificate;
	private byte[] signature;
	private String sigAlgName;
	private String sigAlgOID;
	private byte[] sigAlgParams;
	// indicates whether the signature algorithm parameters are null
	private boolean nullSigAlgParams;
	private PublicKey publicKey;

	// encoding of the certificate
	// BEGIN android-changed
	private volatile byte[] encoding;
	// END android-changed

	//
	// ---------------------- Constructors -------------------------------
	//

	/**
	* Constructs the instance on the base of ASN.1 encoded
	* form of X.509 certificate provided via stream parameter.
	* @param in input stream containing ASN.1 encoded form of certificate.
	* @throws CertificateException if some decoding problems occur.
	*/
	public X509CertImpl(InputStream in) throws CertificateException {
	try {
	// decode the Certificate object
	this.certificate = (Certificate) Certificate.ASN1.decode(in);
	// cache the values of TBSCertificate and Extensions
	this.tbsCert = certificate.getTbsCertificate();
	this.extensions = tbsCert.getExtensions();
	} catch (IOException e) {
	throw new CertificateException(e);
	}
	}

	/**
	* Constructs the instance on the base of existing Certificate object to
	* be wrapped.
	*/
	public X509CertImpl(Certificate certificate) {
	this.certificate = certificate;
	// cache the values of TBSCertificate and Extensions
	this.tbsCert = certificate.getTbsCertificate();
	this.extensions = tbsCert.getExtensions();
	}

	/**
	* Constructs the instance on the base of ASN.1 encoded
	* form of X.509 certificate provided via array of bytes.
	* @param encoding byte array containing ASN.1 encoded form of certificate.
	* @throws IOException if some decoding problems occur.
	*/
	public X509CertImpl(byte[] encoding) throws IOException {
	this((Certificate) Certificate.ASN1.decode(encoding));
	}

	//
	// ----------------- Public methods implementations ------------------
	//

	/**
	* @see java.security.cert.X509Certificate#checkValidity()
	* method documentation for more information.
	*/
	public void checkValidity() throws CertificateExpiredException,
	CertificateNotYetValidException {
	if (notBefore == -1) {
	// retrieve and cache the value of validity period
	notBefore = tbsCert.getValidity().getNotBefore().getTime();
	notAfter = tbsCert.getValidity().getNotAfter().getTime();
	}
	long time = System.currentTimeMillis();
	if (time < notBefore) {
	throw new CertificateNotYetValidException();
	}
	if (time > notAfter) {
	throw new CertificateExpiredException();
	}
	}

	/**
	* @see java.security.cert.X509Certificate#checkValidity(Date)
	* method documentation for more information.
	*/
	public void checkValidity(Date date)
	throws CertificateExpiredException,
	CertificateNotYetValidException {
	if (notBefore == -1) {
	// retrieve and cache the value of validity period
	notBefore = tbsCert.getValidity().getNotBefore().getTime();
	notAfter = tbsCert.getValidity().getNotAfter().getTime();
	}
	long time = date.getTime();
	if (time < notBefore) {
	// BEGIN android-changed
	throw new CertificateNotYetValidException("current time: " + date
	+ ", validation time: " + new Date(notBefore));
	// END android-changed
	}
	if (time > notAfter) {
	// BEGIN android-changed
	throw new CertificateExpiredException("current time: " + date
	+ ", expiration time: " + new Date(notAfter));
	// END android-changed
	}
	}

	/**
	* @see java.security.cert.X509Certificate#getVersion()
	* method documentation for more information.
	*/
	public int getVersion() {
	return tbsCert.getVersion() + 1;
	}

	/**
	* @see java.security.cert.X509Certificate#getSerialNumber()
	* method documentation for more information.
	*/
	public BigInteger getSerialNumber() {
	if (serialNumber == null) {
	serialNumber = tbsCert.getSerialNumber();
	}
	return serialNumber;
	}

	/**
	* @see java.security.cert.X509Certificate#getIssuerDN()
	* method documentation for more information.
	*/
	public Principal getIssuerDN() {
	if (issuer == null) {
	// retrieve the issuer's principal
	issuer = tbsCert.getIssuer().getX500Principal();
	}
	return issuer;
	}

	/**
	* @see java.security.cert.X509Certificate#getIssuerX500Principal()
	* method documentation for more information.
	*/
	public X500Principal getIssuerX500Principal() {
	if (issuer == null) {
	// retrieve the issuer's principal
	issuer = tbsCert.getIssuer().getX500Principal();
	}
	return issuer;
	}

	/**
	* @see java.security.cert.X509Certificate#getSubjectDN()
	* method documentation for more information.
	*/
	public Principal getSubjectDN() {
	if (subject == null) {
	// retrieve the subject's principal
	subject = tbsCert.getSubject().getX500Principal();
	}
	return subject;
	}

	/**
	* @see java.security.cert.X509Certificate#getSubjectX500Principal()
	* method documentation for more information.
	*/
	public X500Principal getSubjectX500Principal() {
	if (subject == null) {
	// retrieve the subject's principal
	subject = tbsCert.getSubject().getX500Principal();
	}
	return subject;
	}

	/**
	* @see java.security.cert.X509Certificate#getNotBefore()
	* method documentation for more information.
	*/
	public Date getNotBefore() {
	if (notBefore == -1) {
	// the value was not retrieved from the certificate, do it:
	notBefore = tbsCert.getValidity().getNotBefore().getTime();
	notAfter = tbsCert.getValidity().getNotAfter().getTime();
	}
	return new Date(notBefore);
	}

	/**
	* @see java.security.cert.X509Certificate#getNotAfter()
	* method documentation for more information.
	*/
	public Date getNotAfter() {
	if (notBefore == -1) {
	// the value was not retrieved from the certificate, do it:
	notBefore = tbsCert.getValidity().getNotBefore().getTime();
	notAfter = tbsCert.getValidity().getNotAfter().getTime();
	}
	return new Date(notAfter);
	}

	/**
	* @see java.security.cert.X509Certificate#getTBSCertificate()
	* method documentation for more information.
	*/
	public byte[] getTBSCertificate()
	throws CertificateEncodingException {
	if (tbsCertificate == null) {
	// retrieve the encoded form of the TBSCertificate structure
	tbsCertificate = tbsCert.getEncoded();
	}
	byte[] result = new byte[tbsCertificate.length];
	System.arraycopy(tbsCertificate, 0, result, 0, tbsCertificate.length);
	return result;
	}

	/**
	* @see java.security.cert.X509Certificate#getSignature()
	* method documentation for more information.
	*/
	public byte[] getSignature() {
	if (signature == null) {
	// retrieve the value of the signature
	signature = certificate.getSignatureValue();
	}
	byte[] result = new byte[signature.length];
	System.arraycopy(signature, 0, result, 0, signature.length);
	return result;
	}

	/**
	* @see java.security.cert.X509Certificate#getSigAlgName()
	* method documentation for more information.
	*/
	public String getSigAlgName() {
	if (sigAlgOID == null) {
	// if info was not retrieved (and cached), do it:
	sigAlgOID = tbsCert.getSignature().getAlgorithm();
	// retrieve the name of the signing algorithm
	sigAlgName = AlgNameMapper.map2AlgName(sigAlgOID);
	if (sigAlgName == null) {
	// if could not be found, use OID as a name
	sigAlgName = sigAlgOID;
	}
	}
	return sigAlgName;
	}

	/**
	* @see java.security.cert.X509Certificate#getSigAlgOID()
	* method documentation for more information.
	*/
	public String getSigAlgOID() {
	if (sigAlgOID == null) {
	// if info was not retrieved (and cached), do it:
	sigAlgOID = tbsCert.getSignature().getAlgorithm();
	// retrieve the name of the signing algorithm
	sigAlgName = AlgNameMapper.map2AlgName(sigAlgOID);
	if (sigAlgName == null) {
	// if could not be found, use OID as a name
	sigAlgName = sigAlgOID;
	}
	}
	return sigAlgOID;
	}

	/**
	* @see java.security.cert.X509Certificate#getSigAlgParams()
	* method documentation for more information.
	*/
	public byte[] getSigAlgParams() {
	if (nullSigAlgParams) {
	return null;
	}
	if (sigAlgParams == null) {
	sigAlgParams = tbsCert.getSignature().getParameters();
	if (sigAlgParams == null) {
	nullSigAlgParams = true;
	return null;
	}
	}
	return sigAlgParams;
	}

	/**
	* @see java.security.cert.X509Certificate#getIssuerUniqueID()
	* method documentation for more information.
	*/
	public boolean[] getIssuerUniqueID() {
	return tbsCert.getIssuerUniqueID();
	}

	/**
	* @see java.security.cert.X509Certificate#getSubjectUniqueID()
	* method documentation for more information.
	*/
	public boolean[] getSubjectUniqueID() {
	return tbsCert.getSubjectUniqueID();
	}

	/**
	* @see java.security.cert.X509Certificate#getKeyUsage()
	* method documentation for more information.
	*/
	public boolean[] getKeyUsage() {
	if (extensions == null) {
	return null;
	}
	return extensions.valueOfKeyUsage();
	}

	/**
	* @see java.security.cert.X509Certificate#getExtendedKeyUsage()
	* method documentation for more information.
	*/
	public List/<String>/ getExtendedKeyUsage()
	throws CertificateParsingException {
	if (extensions == null) {
	return null;
	}
	try {
	return extensions.valueOfExtendedKeyUsage();
	} catch (IOException e) {
	throw new CertificateParsingException(e);
	}
	}

	/**
	* @see java.security.cert.X509Certificate#getBasicConstraints()
	* method documentation for more information.
	*/
	public int getBasicConstraints() {
	if (extensions == null) {
	return Integer.MAX_VALUE;
	}
	return extensions.valueOfBasicConstrains();
	}

	/**
	* @see java.security.cert.X509Certificate#getSubjectAlternativeNames()
	* method documentation for more information.
	*/
	public Collection/<List<?>>/ getSubjectAlternativeNames()
	throws CertificateParsingException {
	if (extensions == null) {
	return null;
	}
	try {
	// Retrieve the extension value from the cached extensions object
	// This extension is not checked for correctness during
	// certificate generation, so now it can throw exception
	return extensions.valueOfSubjectAlternativeName();
	} catch (IOException e) {
	throw new CertificateParsingException(e);
	}
	}

	/**
	* @see java.security.cert.X509Certificate#getIssuerAlternativeNames()
	* method documentation for more information.
	*/
	public Collection/FIXME <List<?>>/ getIssuerAlternativeNames()
	throws CertificateParsingException {
	if (extensions == null) {
	return null;
	}
	try {
	// Retrieve the extension value from the cached extensions object
	// This extension is not checked for correctness during
	// certificate generation, so now it can throw exception
	return extensions.valueOfIssuerAlternativeName();
	} catch (IOException e) {
	throw new CertificateParsingException(e);
	}
	}

	//
	// ----- java.security.cert.Certificate methods implementations ------
	//

	/**
	* @see java.security.cert.Certificate#getEncoded()
	* method documentation for more information.
	*/
	public byte[] getEncoded() throws CertificateEncodingException {
	if (encoding == null) {
	encoding = certificate.getEncoded();
	}
	byte[] result = new byte[encoding.length];
	System.arraycopy(encoding, 0, result, 0, encoding.length);
	return result;
	}

	/**
	* @see java.security.cert.Certificate#getPublicKey()
	* method documentation for more information.
	*/
	public PublicKey getPublicKey() {
	if (publicKey == null) {
	// retrieve the public key from SubjectPublicKeyInfo
	// substructure of X.509 certificate
	publicKey = tbsCert.getSubjectPublicKeyInfo().getPublicKey();
	}
	return publicKey;
	}

	/**
	* @see java.security.cert.Certificate#toString()
	* method documentation for more information.
	*/
	public String toString() {
	return certificate.toString();
	}

	/**
	* Verifies the signature of the certificate.
	* @see java.security.cert.Certificate#verify(PublicKey)
	* method documentation for more information.
	*/
	public void verify(PublicKey key)
	throws CertificateException, NoSuchAlgorithmException,
	InvalidKeyException, NoSuchProviderException,
	SignatureException {

	// BEGIN android-added
	if (getSigAlgName().endsWith("withRSA")) {
	fastVerify(key);
	return;
	}
	// END android-added

	Signature signature = Signature.getInstance(getSigAlgName());
	signature.initVerify(key);
	// retrieve the encoding of the TBSCertificate structure
	if (tbsCertificate == null) {
	tbsCertificate = tbsCert.getEncoded();
	}
	// compute and verify the signature
	signature.update(tbsCertificate, 0, tbsCertificate.length);
	if (!signature.verify(certificate.getSignatureValue())) {
	throw new SignatureException(Messages.getString("security.15C")); //$NON-NLS-1$
	}
	}

	/**
	* Verifies the signature of the certificate.
	* @see java.security.cert.Certificate#verify(PublicKey,String)
	* method documentation for more information.
	*/
	public void verify(PublicKey key, String sigProvider)
	throws CertificateException, NoSuchAlgorithmException,
	InvalidKeyException, NoSuchProviderException,
	SignatureException {

	// BEGIN android-added
	if (getSigAlgName().endsWith("withRSA")) {
	fastVerify(key);
	return;
	}
	// END android-added

	Signature signature =
	Signature.getInstance(getSigAlgName(), sigProvider);
	signature.initVerify(key);
	// retrieve the encoding of the TBSCertificate structure
	if (tbsCertificate == null) {
	tbsCertificate = tbsCert.getEncoded();
	}
	// compute and verify the signature
	signature.update(tbsCertificate, 0, tbsCertificate.length);
	if (!signature.verify(certificate.getSignatureValue())) {
	throw new SignatureException(Messages.getString("security.15C")); //$NON-NLS-1$
	}
	}

	// BEGIN android-added
	/**
	* Implements a faster RSA verification method that delegates to OpenSSL
	* native code. In all other aspects it behaves just like the ordinary
	* {@link verify} method.
	*
	* @param key The RSA public key to use
	*
	* @throws SignatureException If the verification fails.
	* @throws InvalidKeyException
	*/
	private void fastVerify(PublicKey key) throws SignatureException,
	InvalidKeyException, NoSuchAlgorithmException {
	if (!(key instanceof RSAPublicKey)) {
	throw new InvalidKeyException(Messages.getString("security.15C1"));
	}
	RSAPublicKey rsaKey = (RSAPublicKey) key;

	String algorithm = getSigAlgName();

	// We don't support MD2 anymore. This needs to also check for aliases
	// and OIDs.
	if ("MD2withRSA".equalsIgnoreCase(algorithm) \|\|
	"MD2withRSAEncryption".equalsIgnoreCase(algorithm) \|\|
	"1.2.840.113549.1.1.2".equalsIgnoreCase(algorithm) \|\|
	"MD2/RSA".equalsIgnoreCase(algorithm)) {
	throw new NoSuchAlgorithmException(algorithm);
	}

	int i = algorithm.indexOf("with");
	algorithm = algorithm.substring(i + 4) + "-" + algorithm.substring(0, i);

	if (tbsCertificate == null) {
	tbsCertificate = tbsCert.getEncoded();
	}

	byte[] sig = certificate.getSignatureValue();
	if (!OpenSSLSocketImpl.verifySignature(tbsCertificate, sig, algorithm, rsaKey)) {
	throw new SignatureException(Messages.getString("security.15C")); //$NON-NLS-1$
	}
	}
	// END android-added

	//
	// ----- java.security.cert.X509Extension methods implementations ----
	//

	/**
	* @see java.security.cert.X509Extension#getNonCriticalExtensionOIDs()
	* method documentation for more information.
	*/
	public Set getNonCriticalExtensionOIDs() {
	if (extensions == null) {
	return null;
	}
	// retrieve the info from the cached extensions object
	return extensions.getNonCriticalExtensions();
	}

	/**
	* @see java.security.cert.X509Extension#getCriticalExtensionOIDs()
	* method documentation for more information.
	*/
	public Set getCriticalExtensionOIDs() {
	if (extensions == null) {
	return null;
	}
	// retrieve the info from the cached extensions object
	return extensions.getCriticalExtensions();
	}

	/**
	* @see java.security.cert.X509Extension#getExtensionValue(String)
	* method documentation for more information.
	*/
	public byte[] getExtensionValue(String oid) {
	if (extensions == null) {
	return null;
	}
	// retrieve the info from the cached extensions object
	Extension ext = extensions.getExtensionByOID(oid);
	return (ext == null) ? null : ext.getRawExtnValue();
	}

	/**
	* @see java.security.cert.X509Extension#hasUnsupportedCriticalExtension()
	* method documentation for more information.
	*/
	public boolean hasUnsupportedCriticalExtension() {
	if (extensions == null) {
	return false;
	}
	// retrieve the info from the cached extensions object
	return extensions.hasUnsupportedCritical();
	}

	}