HarmonyOS 签名后生成的unit8array如何转成字符串

这是你们之前提供签名方法，签名后的数据怎么转成字符串呢：

// 完整的明文被拆分为input1和input2
let input1: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from("This is Sign test plan1", 'utf-8').buffer) };
let input2: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from("This is Sign test plan2", 'utf-8').buffer) };
async function signMessagePromise(priKey: cryptoFramework.PriKey) {
  let signAlg = "RSA1024|PKCS1|MD5";
  let signer = cryptoFramework.createSign(signAlg);
  await signer.init(priKey);
  await signer.update(input1); // 如果明文较短，可以直接调用sign接口一次性传入
  let signData = await signer.sign(input2);
  return signData;
}
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