HarmonyOS 证书解析后CN怎么获取且是中文

let CNData = x509Cert.getSubjectName().data; 
let CN = this.parseCN(CNData) 
Logger.info('CN=：', CN.toString()); 
 
parseCN = (data:Uint8Array):string=>{ 
  let decodeWithStreamOptions: util.DecodeWithStreamOptions = { 
    stream: false 
  } 
  let textDecoderOptions: util.TextDecoderOptions = { 
    fatal: false, 
    ignoreBOM : true 
  } 
  let textDecoder = util.TextDecoder.create('utf-8', textDecoderOptions); 
  return textDecoder.decodeWithStream(data , decodeWithStreamOptions); 
}