content: /*
   * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package java.security.cert;
  
  import java.math.BigInteger;
  import java.security.*;
  import java.util.Collection;
  import java.util.Date;
  import java.util.List;
  import javax.security.auth.x500.X500Principal;
  
  import sun.security.x509.X509CertImpl;
  
  /**
   * <p>
   * Abstract class for X.509 certificates. This provides a standard
   * way to access all the attributes of an X.509 certificate.
   * <p>
   * In June of 1996, the basic X.509 v3 format was completed by
   * ISO/IEC and ANSI X9, which is described below in ASN.1:
   * <pre>
   * Certificate  ::=  SEQUENCE  {
   *     tbsCertificate       TBSCertificate,
   *     signatureAlgorithm   AlgorithmIdentifier,
   *     signature            BIT STRING  }
   * </pre>
   * <p>
   * These certificates are widely used to support authentication and
   * other functionality in Internet security systems. Common applications
   * include Privacy Enhanced Mail (PEM), Transport Layer Security (SSL),
   * code signing for trusted software distribution, and Secure Electronic
   * Transactions (SET).
   * <p>
   * These certificates are managed and vouched for by <em>Certificate
   * Authorities</em> (CAs). CAs are services which create certificates by
   * placing data in the X.509 standard format and then digitally signing
   * that data. CAs act as trusted third parties, making introductions
   * between principals who have no direct knowledge of each other.
   * CA certificates are either signed by themselves, or by some other
   * CA such as a "root" CA.
   * <p>
   * More information can be found in
   * <a href="http://www.ietf.org/rfc/rfc3280.txt">RFC 3280: Internet X.509
   * Public Key Infrastructure Certificate and CRL Profile</a>.
   * <p>
   * The ASN.1 definition of {@code tbsCertificate} is:
   * <pre>
   * TBSCertificate  ::=  SEQUENCE  {
   *     version         [0]  EXPLICIT Version DEFAULT v1,
   *     serialNumber         CertificateSerialNumber,
   *     signature            AlgorithmIdentifier,
   *     issuer               Name,
   *     validity             Validity,
   *     subject              Name,
   *     subjectPublicKeyInfo SubjectPublicKeyInfo,
   *     issuerUniqueID  [1]  IMPLICIT UniqueIdentifier OPTIONAL,
   *                          -- If present, version must be v2 or v3
   *     subjectUniqueID [2]  IMPLICIT UniqueIdentifier OPTIONAL,
   *                          -- If present, version must be v2 or v3
   *     extensions      [3]  EXPLICIT Extensions OPTIONAL
   *                          -- If present, version must be v3
   *     }
   * </pre>
   * <p>
   * Certificates are instantiated using a certificate factory. The following is
   * an example of how to instantiate an X.509 certificate:
   * <pre>
   * try (InputStream inStream = new FileInputStream("fileName-of-cert")) {
   *     CertificateFactory cf = CertificateFactory.getInstance("X.509");
   *     X509Certificate cert = (X509Certificate)cf.generateCertificate(inStream);
   * }
   * </pre>
   *
   * @author Hemma Prafullchandra
   *
   *
   * @see Certificate
   * @see CertificateFactory
   * @see X509Extension
   */
  
  public abstract class X509Certificate extends Certificate
  implements X509Extension {
  
      private static final long serialVersionUID = -2491127588187038216L;
  
      private transient X500Principal subjectX500Principal, issuerX500Principal;
  
      /**
       * Constructor for X.509 certificates.
       */
      protected X509Certificate() {
          super("X.509");
      }
  
      /**
       * Checks that the certificate is currently valid. It is if
       * the current date and time are within the validity period given in the
       * certificate.
       * <p>
       * The validity period consists of two date/time values:
       * the first and last dates (and times) on which the certificate
       * is valid. It is defined in
       * ASN.1 as:
       * <pre>
       * validity             Validity
       *
       * Validity ::= SEQUENCE {
       *     notBefore      CertificateValidityDate,
       *     notAfter       CertificateValidityDate }
       *
       * CertificateValidityDate ::= CHOICE {
       *     utcTime        UTCTime,
       *     generalTime    GeneralizedTime }
       * </pre>
       *
       * @exception CertificateExpiredException if the certificate has expired.
       * @exception CertificateNotYetValidException if the certificate is not
       * yet valid.
       */
      public abstract void checkValidity()
          throws CertificateExpiredException, CertificateNotYetValidException;
  
      /**
       * Checks that the given date is within the certificate's
       * validity period. In other words, this determines whether the
       * certificate would be valid at the given date/time.
       *
       * @param date the Date to check against to see if this certificate
       *        is valid at that date/time.
       *
       * @exception CertificateExpiredException if the certificate has expired
       * with respect to the {@code date} supplied.
       * @exception CertificateNotYetValidException if the certificate is not
       * yet valid with respect to the {@code date} supplied.
       *
       * @see #checkValidity()
       */
      public abstract void checkValidity(Date date)
          throws CertificateExpiredException, CertificateNotYetValidException;
  
      /**
       * Gets the {@code version} (version number) value from the
       * certificate.
       * The ASN.1 definition for this is:
       * <pre>
       * version  [0] EXPLICIT Version DEFAULT v1
       *
       * Version ::=  INTEGER  {  v1(0), v2(1), v3(2)  }
       * </pre>
       * @return the version number, i.e. 1, 2 or 3.
       */
      public abstract int getVersion();
  
      /**
       * Gets the {@code serialNumber} value from the certificate.
       * The serial number is an integer assigned by the certification
       * authority to each certificate. It must be unique for each
       * certificate issued by a given CA (i.e., the issuer name and
       * serial number identify a unique certificate).
       * The ASN.1 definition for this is:
       * <pre>
       * serialNumber     CertificateSerialNumber
       *
       * CertificateSerialNumber  ::=  INTEGER
       * </pre>
       *
       * @return the serial number.
       */
      public abstract BigInteger getSerialNumber();
  
      /**
       * <strong>Denigrated</strong>, replaced by {@linkplain
       * #getIssuerX500Principal()}. This method returns the {@code issuer}
       * as an implementation specific Principal object, which should not be
       * relied upon by portable code.
       *
       * <p>
       * Gets the {@code issuer} (issuer distinguished name) value from
       * the certificate. The issuer name identifies the entity that signed (and
       * issued) the certificate.
       *
       * <p>The issuer name field contains an
       * X.500 distinguished name (DN).
       * The ASN.1 definition for this is:
       * <pre>
       * issuer    Name
       *
       * Name ::= CHOICE { RDNSequence }
       * RDNSequence ::= SEQUENCE OF RelativeDistinguishedName
       * RelativeDistinguishedName ::=
       *     SET OF AttributeValueAssertion
       *
       * AttributeValueAssertion ::= SEQUENCE {
       *                               AttributeType,
       *                               AttributeValue }
       * AttributeType ::= OBJECT IDENTIFIER
       * AttributeValue ::= ANY
       * </pre>
       * The {@code Name} describes a hierarchical name composed of
       * attributes,
       * such as country name, and corresponding values, such as US.
       * The type of the {@code AttributeValue} component is determined by
       * the {@code AttributeType}; in general it will be a
       * {@code directoryString}. A {@code directoryString} is usually
       * one of {@code PrintableString},
       * {@code TeletexString} or {@code UniversalString}.
       *
       * @return a Principal whose name is the issuer distinguished name.
       */
      public abstract Principal getIssuerDN();
  
      /**
       * Returns the issuer (issuer distinguished name) value from the
       * certificate as an {@code X500Principal}.
       * <p>
       * It is recommended that subclasses override this method.
       *
       * @return an {@code X500Principal} representing the issuer
       *          distinguished name
       * @since 1.4
       */
      public X500Principal getIssuerX500Principal() {
          if (issuerX500Principal == null) {
              issuerX500Principal = X509CertImpl.getIssuerX500Principal(this);
          }
          return issuerX500Principal;
      }
  
      /**
       * <strong>Denigrated</strong>, replaced by {@linkplain
       * #getSubjectX500Principal()}. This method returns the {@code subject}
       * as an implementation specific Principal object, which should not be
       * relied upon by portable code.
       *
       * <p>
       * Gets the {@code subject} (subject distinguished name) value
       * from the certificate.  If the {@code subject} value is empty,
       * then the {@code getName()} method of the returned
       * {@code Principal} object returns an empty string ("").
       *
       * <p> The ASN.1 definition for this is:
       * <pre>
       * subject    Name
       * </pre>
       *
       * <p>See {@link #getIssuerDN() getIssuerDN} for {@code Name}
       * and other relevant definitions.
       *
       * @return a Principal whose name is the subject name.
       */
      public abstract Principal getSubjectDN();
  
      /**
       * Returns the subject (subject distinguished name) value from the
       * certificate as an {@code X500Principal}.  If the subject value
       * is empty, then the {@code getName()} method of the returned
       * {@code X500Principal} object returns an empty string ("").
       * <p>
       * It is recommended that subclasses override this method.
       *
       * @return an {@code X500Principal} representing the subject
       *          distinguished name
       * @since 1.4
       */
      public X500Principal getSubjectX500Principal() {
          if (subjectX500Principal == null) {
              subjectX500Principal = X509CertImpl.getSubjectX500Principal(this);
          }
          return subjectX500Principal;
      }
  
      /**
       * Gets the {@code notBefore} date from the validity period of
       * the certificate.
       * The relevant ASN.1 definitions are:
       * <pre>
       * validity             Validity
       *
       * Validity ::= SEQUENCE {
       *     notBefore      CertificateValidityDate,
       *     notAfter       CertificateValidityDate }
       *
       * CertificateValidityDate ::= CHOICE {
       *     utcTime        UTCTime,
       *     generalTime    GeneralizedTime }
       * </pre>
       *
       * @return the start date of the validity period.
       * @see #checkValidity
       */
      public abstract Date getNotBefore();
  
      /**
       * Gets the {@code notAfter} date from the validity period of
       * the certificate. See {@link #getNotBefore() getNotBefore}
       * for relevant ASN.1 definitions.
       *
       * @return the end date of the validity period.
       * @see #checkValidity
       */
      public abstract Date getNotAfter();
  
      /**
       * Gets the DER-encoded certificate information, the
       * {@code tbsCertificate} from this certificate.
       * This can be used to verify the signature independently.
       *
       * @return the DER-encoded certificate information.
       * @exception CertificateEncodingException if an encoding error occurs.
       */
      public abstract byte[] getTBSCertificate()
          throws CertificateEncodingException;
  
      /**
       * Gets the {@code signature} value (the raw signature bits) from
       * the certificate.
       * The ASN.1 definition for this is:
       * <pre>
       * signature     BIT STRING
       * </pre>
       *
       * @return the signature.
       */
      public abstract byte[] getSignature();
  
      /**
       * Gets the signature algorithm name for the certificate
       * signature algorithm. An example is the string "SHA256withRSA".
       * The ASN.1 definition for this is:
       * <pre>
       * signatureAlgorithm   AlgorithmIdentifier
       *
       * AlgorithmIdentifier  ::=  SEQUENCE  {
       *     algorithm               OBJECT IDENTIFIER,
       *     parameters              ANY DEFINED BY algorithm OPTIONAL  }
       *                             -- contains a value of the type
       *                             -- registered for use with the
       *                             -- algorithm object identifier value
       * </pre>
       *
       * <p>The algorithm name is determined from the {@code algorithm}
       * OID string.
       *
       * @return the signature algorithm name.
       */
      public abstract String getSigAlgName();
  
      /**
       * Gets the signature algorithm OID string from the certificate.
       * An OID is represented by a set of nonnegative whole numbers separated
       * by periods.
       * For example, the string "1.2.840.10040.4.3" identifies the SHA-1
       * with DSA signature algorithm defined in
       * <a href="http://www.ietf.org/rfc/rfc3279.txt">RFC 3279: Algorithms and
       * Identifiers for the Internet X.509 Public Key Infrastructure Certificate
       * and CRL Profile</a>.
       *
       * <p>See {@link #getSigAlgName() getSigAlgName} for
       * relevant ASN.1 definitions.
       *
       * @return the signature algorithm OID string.
       */
      public abstract String getSigAlgOID();
  
      /**
       * Gets the DER-encoded signature algorithm parameters from this
       * certificate's signature algorithm. In most cases, the signature
       * algorithm parameters are null; the parameters are usually
       * supplied with the certificate's public key.
       * If access to individual parameter values is needed then use
       * {@link AlgorithmParameters AlgorithmParameters}
       * and instantiate with the name returned by
       * {@link #getSigAlgName() getSigAlgName}.
       *
       * <p>See {@link #getSigAlgName() getSigAlgName} for
       * relevant ASN.1 definitions.
       *
       * @return the DER-encoded signature algorithm parameters, or
       *         null if no parameters are present.
       */
      public abstract byte[] getSigAlgParams();
  
      /**
       * Gets the {@code issuerUniqueID} value from the certificate.
       * The issuer unique identifier is present in the certificate
       * to handle the possibility of reuse of issuer names over time.
       * RFC 3280 recommends that names not be reused and that
       * conforming certificates not make use of unique identifiers.
       * Applications conforming to that profile should be capable of
       * parsing unique identifiers and making comparisons.
       *
       * <p>The ASN.1 definition for this is:
       * <pre>
       * issuerUniqueID  [1]  IMPLICIT UniqueIdentifier OPTIONAL
       *
       * UniqueIdentifier  ::=  BIT STRING
       * </pre>
       *
       * @return the issuer unique identifier or null if it is not
       * present in the certificate.
       */
      public abstract boolean[] getIssuerUniqueID();
  
      /**
       * Gets the {@code subjectUniqueID} value from the certificate.
       *
       * <p>The ASN.1 definition for this is:
       * <pre>
       * subjectUniqueID  [2]  IMPLICIT UniqueIdentifier OPTIONAL
       *
       * UniqueIdentifier  ::=  BIT STRING
       * </pre>
       *
       * @return the subject unique identifier or null if it is not
       * present in the certificate.
       */
      public abstract boolean[] getSubjectUniqueID();
  
      /**
       * Gets a boolean array representing bits of
       * the {@code KeyUsage} extension, (OID = 2.5.29.15).
       * The key usage extension defines the purpose (e.g., encipherment,
       * signature, certificate signing) of the key contained in the
       * certificate.
       * The ASN.1 definition for this is:
       * <pre>
       * KeyUsage ::= BIT STRING {
       *     digitalSignature        (0),
       *     nonRepudiation          (1),
       *     keyEncipherment         (2),
       *     dataEncipherment        (3),
       *     keyAgreement            (4),
       *     keyCertSign             (5),
       *     cRLSign                 (6),
       *     encipherOnly            (7),
       *     decipherOnly            (8) }
       * </pre>
       * RFC 3280 recommends that when used, this be marked
       * as a critical extension.
       *
       * @return the KeyUsage extension of this certificate, represented as
       * an array of booleans. The order of KeyUsage values in the array is
       * the same as in the above ASN.1 definition. The array will contain a
       * value for each KeyUsage defined above. If the KeyUsage list encoded
       * in the certificate is longer than the above list, it will not be
       * truncated. Returns null if this certificate does not
       * contain a KeyUsage extension.
       */
      public abstract boolean[] getKeyUsage();
  
      /**
       * Gets an unmodifiable list of Strings representing the OBJECT
       * IDENTIFIERs of the {@code ExtKeyUsageSyntax} field of the
       * extended key usage extension, (OID = 2.5.29.37).  It indicates
       * one or more purposes for which the certified public key may be
       * used, in addition to or in place of the basic purposes
       * indicated in the key usage extension field.  The ASN.1
       * definition for this is:
       * <pre>
       * ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId
       *
       * KeyPurposeId ::= OBJECT IDENTIFIER
       * </pre>
       *
       * Key purposes may be defined by any organization with a
       * need. Object identifiers used to identify key purposes shall be
       * assigned in accordance with IANA or ITU-T Rec. X.660 |
       * ISO/IEC/ITU 9834-1.
       * <p>
       * This method was added to version 1.4 of the Java 2 Platform Standard
       * Edition. In order to maintain backwards compatibility with existing
       * service providers, this method is not {@code abstract}
       * and it provides a default implementation. Subclasses
       * should override this method with a correct implementation.
       *
       * @return the ExtendedKeyUsage extension of this certificate,
       *         as an unmodifiable list of object identifiers represented
       *         as Strings. Returns null if this certificate does not
       *         contain an ExtendedKeyUsage extension.
       * @throws CertificateParsingException if the extension cannot be decoded
       * @since 1.4
       */
      public List<String> getExtendedKeyUsage() throws CertificateParsingException {
          return X509CertImpl.getExtendedKeyUsage(this);
      }
  
      /**
       * Gets the certificate constraints path length from the
       * critical {@code BasicConstraints} extension, (OID = 2.5.29.19).
       * <p>
       * The basic constraints extension identifies whether the subject
       * of the certificate is a Certificate Authority (CA) and
       * how deep a certification path may exist through that CA. The
       * {@code pathLenConstraint} field (see below) is meaningful
       * only if {@code cA} is set to TRUE. In this case, it gives the
       * maximum number of CA certificates that may follow this certificate in a
       * certification path. A value of zero indicates that only an end-entity
       * certificate may follow in the path.
       * <p>
       * The ASN.1 definition for this is:
       * <pre>
       * BasicConstraints ::= SEQUENCE {
       *     cA                  BOOLEAN DEFAULT FALSE,
       *     pathLenConstraint   INTEGER (0..MAX) OPTIONAL }
       * </pre>
       *
       * @return the value of {@code pathLenConstraint} if the
       * BasicConstraints extension is present in the certificate and the
       * subject of the certificate is a CA, otherwise -1.
       * If the subject of the certificate is a CA and
       * {@code pathLenConstraint} does not appear,
       * {@code Integer.MAX_VALUE} is returned to indicate that there is no
       * limit to the allowed length of the certification path.
       */
      public abstract int getBasicConstraints();
  
      /**
       * Gets an immutable collection of subject alternative names from the
       * {@code SubjectAltName} extension, (OID = 2.5.29.17).
       * <p>
       * The ASN.1 definition of the {@code SubjectAltName} extension is:
       * <pre>
       * SubjectAltName ::= GeneralNames
       *
       * GeneralNames :: = SEQUENCE SIZE (1..MAX) OF GeneralName
       *
       * GeneralName ::= CHOICE {
       *      otherName                       [0]     OtherName,
       *      rfc822Name                      [1]     IA5String,
       *      dNSName                         [2]     IA5String,
       *      x400Address                     [3]     ORAddress,
       *      directoryName                   [4]     Name,
       *      ediPartyName                    [5]     EDIPartyName,
       *      uniformResourceIdentifier       [6]     IA5String,
       *      iPAddress                       [7]     OCTET STRING,
       *      registeredID                    [8]     OBJECT IDENTIFIER}
       * </pre>
       * <p>
       * If this certificate does not contain a {@code SubjectAltName}
       * extension, {@code null} is returned. Otherwise, a
       * {@code Collection} is returned with an entry representing each
       * {@code GeneralName} included in the extension. Each entry is a
       * {@code List} whose first entry is an {@code Integer}
       * (the name type, 0-8) and whose second entry is a {@code String}
       * or a byte array (the name, in string or ASN.1 DER encoded form,
       * respectively).
       * <p>
       * <a href="http://www.ietf.org/rfc/rfc822.txt">RFC 822</a>, DNS, and URI
       * names are returned as {@code String}s,
       * using the well-established string formats for those types (subject to
       * the restrictions included in RFC 3280). IPv4 address names are
       * returned using dotted quad notation. IPv6 address names are returned
       * in the form "a1:a2:...:a8", where a1-a8 are hexadecimal values
       * representing the eight 16-bit pieces of the address. OID names are
       * returned as {@code String}s represented as a series of nonnegative
       * integers separated by periods. And directory names (distinguished names)
       * are returned in <a href="http://www.ietf.org/rfc/rfc2253.txt">
       * RFC 2253</a> string format. No standard string format is
       * defined for otherNames, X.400 names, EDI party names, or any
       * other type of names. They are returned as byte arrays
       * containing the ASN.1 DER encoded form of the name.
       * <p>
       * Note that the {@code Collection} returned may contain more
       * than one name of the same type. Also, note that the returned
       * {@code Collection} is immutable and any entries containing byte
       * arrays are cloned to protect against subsequent modifications.
       * <p>
       * This method was added to version 1.4 of the Java 2 Platform Standard
       * Edition. In order to maintain backwards compatibility with existing
       * service providers, this method is not {@code abstract}
       * and it provides a default implementation. Subclasses
       * should override this method with a correct implementation.
       *
       * @return an immutable {@code Collection} of subject alternative
       * names (or {@code null})
       * @throws CertificateParsingException if the extension cannot be decoded
       * @since 1.4
       */
      public Collection<List<?>> getSubjectAlternativeNames()
          throws CertificateParsingException {
          return X509CertImpl.getSubjectAlternativeNames(this);
      }
  
      /**
       * Gets an immutable collection of issuer alternative names from the
       * {@code IssuerAltName} extension, (OID = 2.5.29.18).
       * <p>
       * The ASN.1 definition of the {@code IssuerAltName} extension is:
       * <pre>
       * IssuerAltName ::= GeneralNames
       * </pre>
       * The ASN.1 definition of {@code GeneralNames} is defined
       * in {@link #getSubjectAlternativeNames getSubjectAlternativeNames}.
       * <p>
       * If this certificate does not contain an {@code IssuerAltName}
       * extension, {@code null} is returned. Otherwise, a
       * {@code Collection} is returned with an entry representing each
       * {@code GeneralName} included in the extension. Each entry is a
       * {@code List} whose first entry is an {@code Integer}
       * (the name type, 0-8) and whose second entry is a {@code String}
       * or a byte array (the name, in string or ASN.1 DER encoded form,
       * respectively). For more details about the formats used for each
       * name type, see the {@code getSubjectAlternativeNames} method.
       * <p>
       * Note that the {@code Collection} returned may contain more
       * than one name of the same type. Also, note that the returned
       * {@code Collection} is immutable and any entries containing byte
       * arrays are cloned to protect against subsequent modifications.
       * <p>
       * This method was added to version 1.4 of the Java 2 Platform Standard
       * Edition. In order to maintain backwards compatibility with existing
       * service providers, this method is not {@code abstract}
       * and it provides a default implementation. Subclasses
       * should override this method with a correct implementation.
       *
       * @return an immutable {@code Collection} of issuer alternative
       * names (or {@code null})
       * @throws CertificateParsingException if the extension cannot be decoded
       * @since 1.4
       */
      public Collection<List<?>> getIssuerAlternativeNames()
          throws CertificateParsingException {
          return X509CertImpl.getIssuerAlternativeNames(this);
      }
  
       /**
       * Verifies that this certificate was signed using the
       * private key that corresponds to the specified public key.
       * This method uses the signature verification engine
       * supplied by the specified provider. Note that the specified
       * Provider object does not have to be registered in the provider list.
       *
       * This method was added to version 1.8 of the Java Platform Standard
       * Edition. In order to maintain backwards compatibility with existing
       * service providers, this method is not {@code abstract}
       * and it provides a default implementation.
       *
       * @param key the PublicKey used to carry out the verification.
       * @param sigProvider the signature provider.
       *
       * @exception NoSuchAlgorithmException on unsupported signature
       * algorithms.
       * @exception InvalidKeyException on incorrect key.
       * @exception SignatureException on signature errors.
       * @exception CertificateException on encoding errors.
       * @exception UnsupportedOperationException if the method is not supported
       * @since 1.8
       */
      public void verify(PublicKey key, Provider sigProvider)
          throws CertificateException, NoSuchAlgorithmException,
          InvalidKeyException, SignatureException {
          // Android-changed: Eliminate infinite recursion in default implementation.
          // The method X509CertImpl calls this method, thus entering an
          // infinite recursive loop. This strange behaviour was checked to be not
          // specific to libcore by running a test with vogar --mode=jvm.
          // This is fixed upstream in OpenJDK 10.
          //
          // X509CertImpl.verify(this, key, sigProvider);
          super.verify(key, sigProvider);
      }
  }
  