    issuer: this.issuer,
      infoAccess: this.infoAccess,
      validFrom: this.validFrom,
      validTo: this.validTo,
      fingerprint: this.fingerprint,
      fingerprint256: this.fingerprint256,
      fingerprint512: this.fingerprint512,
      keyUsage: this.keyUsage,
      serialNumber: this.serialNumber,
    }, opts)}`;
  }

  [kClone]() {
    const handle = this[kHandle];
    return {
      data: { handle },
      deserializeInfo: 'internal/crypto/x509:InternalX509Certificate'
    };
  }

  [kDeserialize]({ handle }) {
    this[kHandle] = handle;
  }

  get subject() {
    let value = this[kInternalState].get('subject');
    if (value === undefined) {
      value = this[kHandle].subject();
      this[kInternalState].set('subject', value);
    }
    return value;
  }

  get subjectAltName() {
    let value = this[kInternalState].get('subjectAltName');
    if (value === undefined) {
      value = this[kHandle].subjectAltName();
      this[kInternalState].set('subjectAltName', value);
    }
    return value;
  }

  get issuer() {
    let value = this[kInternalState].get('issuer');
    if (value === undefined) {
      value = this[kHandle].issuer();
      this[kInternalState].set('issuer', value);
    }
    return value;
  }

  get issuerCertificate() {
    let value = this[kInternalState].get('issuerCertificate');
    if (value === undefined) {
      const cert = this[kHandle].getIssuerCert();
      if (cert)
        value = new InternalX509Certificate(this[kHandle].getIssuerCert());
      this[kInternalState].set('issuerCertificate', value);
    }
    return value;
  }

  get infoAccess() {
    let value = this[kInternalState].get('infoAccess');
    if (value === undefined) {
      value = this[kHandle].infoAccess();
      this[kInternalState].set('infoAccess', value);
    }
    return value;
  }

  get validFrom() {
    let value = this[kInternalState].get('validFrom');
    if (value === undefined) {
      value = this[kHandle].validFrom();
      this[kInternalState].set('validFrom', value);
    }
    return value;
  }

  get validTo() {
    let value = this[kInternalState].get('validTo');
    if (value === undefined) {
      value = this[kHandle].validTo();
      this[kInternalState].set('validTo', value);
    }
    return value;
  }

  get fingerprint() {
    let value = this[kInternalState].get('fingerprint');
    if (value === undefined) {
      value = this[kHandle].fingerprint();
      this[kInternalState].set('fingerprint', value);
    }
    return value;
  }

  get fingerprint256() {
    let value = this[kInternalState].get('fingerprint256');
    if (value === undefined) {
      value = this[kHandle].fingerprint256();
      this[kInternalState].set('fingerprint256', value);
    }
    return value;
  }

  get fingerprint512() {
    let value = this[kInternalState].get('fingerprint512');
    if (value === undefined) {
      value = this[kHandle].fingerprint512();
      this[kInternalState].set('fingerprint512', value);
    }
    return value;
  }

  get keyUsage() {
    let value = this[kInternalState].get('keyUsage');
    if (value === undefined) {
      value = this[kHandle].keyUsage();
      this[kInternalState].set('keyUsage', value);
    }
    return value;
  }

  get serialNumber() {
    let value = this[kInternalState].get('serialNumber');
    if (value === undefined) {
      value = this[kHandle].serialNumber();
      this[kInternalState].set('serialNumber', value);
    }
    return value;
  }

  get raw() {
    let value = this[kInternalState].get('raw');
    if (value === undefined) {
      value = this[kHandle].raw();
      this[kInternalState].set('raw', value);
    }
    return value;
  }

  get publicKey() {
    let value = this[kInternalState].get('publicKey');
    if (value === undefined) {
      value = new PublicKeyObject(this[kHandle].publicKey());
      this[kInternalState].set('publicKey', value);
    }
    return value;
  }

  toString() {
    let value = this[kInternalState].get('pem');
    if (value === undefined) {
      value = this[kHandle].pem();
      this[kInternalState].set('pem', value);
    }
    return value;
  }

  // There's no standardized JSON encoding for X509 certs so we
  // fallback to providing the PEM encoding as a string.
  toJSON() { return this.toString(); }

  get ca() {
    let value = this[kInternalState].get('ca');
    if (value === undefined) {
      value = this[kHandle].checkCA();
      this[kInternalState].set('ca', value);
    }
    return value;
  }

  checkHost(name, options) {
    validateString(name, 'name');
    return this[kHandle].checkHost(name, getFlags(options));
  }

  checkEmail(email, options) {
    validateString(email, 'email');
    return this[kHandle].checkEmail(email, getFlags(options));
  }

  checkIP(ip, options) {
    validateString(ip, 'ip');
    // The options argument is currently undocumented since none of the options
    // have any effect on the behavior of this function. However, we still parse
    // the options argument in case OpenSSL adds flags in the future that do
    // affect the behavior of X509_check_ip. This ensures that no invalid values
    // are passed as the second argument in the meantime.
    return this[kHandle].checkIP(ip, getFlags(options));
  }

  checkIssued(otherCert) {
    if (!isX509Certificate(otherCert))
      throw new ERR_INVALID_ARG_TYPE('otherCert', 'X509Certificate', otherCert);
    return this[kHandle].checkIssued(otherCert[kHandle]);
  }

  checkPrivateKey(pkey) {
    if (!isKeyObject(pkey))
      throw new ERR_INVALID_ARG_TYPE('pkey', 'KeyObject', pkey);
    if (pkey.type !== 'private')
      throw new ERR_INVALID_ARG_VALUE('pkey', pkey);
    return this[kHandle].checkPrivateKey(pkey[kHandle]);
  }

  verify(pkey) {
    if (!isKeyObject(pkey))
      throw new ERR_INVALID_ARG_TYPE('pkey', 'KeyObject', pkey);
    if (pkey.type !== 'public')
      throw new ERR_INVALID_ARG_VALUE('pkey', pkey);
    return this[kHandle].verify(pkey[kHandle]);
  }

  toLegacyObject() {
    return this[kHandle].toLegacy();
  }
}

InternalX509Certificate.prototype.constructor = X509Certificate;
ObjectSetPrototypeOf(
  InternalX509Certificate.prototype,
  X509Certificate.prototype);

module.exports = {
  X509Certificate,
  InternalX509Certificate,
  isX509Certificate,
};
