证书解析：解析证书CN怎么获取

// 解析证书 
certParseByBase64Str =  (base64Str: string): ResolveResult =>{ 
 
  let certData = '-----BEGIN CERTIFICATE-----\n' + 
    base64Str+ 
    '\n-----END CERTIFICATE-----\n'; 
  Logger.info('certData=：', certData); 
  let textEncoder = new util.TextEncoder(); 
  let encodingBlob: certFramework.EncodingBlob = { 
    // 将证书数据从string类型转换成Unit8Array 
    data: textEncoder.encodeInto(certData), 
    // 证书格式，仅支持PEM和DER。在此示例中，证书为PEM格式 
    encodingFormat: certFramework.EncodingFormat.FORMAT_PEM 
  }; 
  let resultData: ESObject = {}; 
  let ret: ResolveResult = {} 
 
  certFramework.createX509Cert(encodingBlob, (err, x509Cert) => { 
    if (err != null) { 
      Logger.info('err.message=：', JSON.stringify(err)); 
      // 创建X509Cert实例失败 
      ret = {iSuccessful:false,errorMsg:"createX509Cert failed, errCode:${err.code}, errMsg:${err.message}",data:resultData}; 
      return ret; 
    }else{ 
      try{ 
        // 
        let CN = x509Cert.getSubjectName(); 
        // 证书的序列号 
        let serialNumner = x509Cert.getCertSerialNumber(); 
        // 证书有效期起始日期 
        let notBeforeTime  = x509Cert.getNotBeforeTime(); 
        // 证书有效期截止日期 
        let notAfterTime  = x509Cert.getNotAfterTime(); 
        Logger.info('serialNumner=：', serialNumner.toString()); 
        Logger.info('notBeforeTime=：', notBeforeTime); 
        Logger.info('notAfterTime=：', notAfterTime); 
        resultData = { 
          serialNumner:serialNumner, 
          notBeforeTime:notBeforeTime, 
          notAfterTime:notAfterTime, 
          CN:CN 
        }; 
        // Logger.info('resultData=：', JSON.stringify(resultData)); 
 
        ret = {iSuccessful:true,errorMsg:'',data:resultData}; 
        return ret; 
      }catch(e){ 
        ret = {iSuccessful:false,errorMsg:"解析异常"+e.message,data:resultData}; 
        return ret; 
      } 
    } 
 
  }) 
}