HarmonyOS 需要RSA/ECB/PKCS1Padding加密。目前文档没有看到有支持这个模式

参考下述demo：

public static async add(str: string, publicKey: string): Promise<string> {
  let result = ``;
  try {
  let asyKeyGenerator = cryptoFramework.createAsyKeyGenerator("RSA1024");
  let cipher = cryptoFramework.createCipher("RSA|ECB|PKCS1"); //创建一个 Cipher (加密)对象
  //引入外部的公钥加密

  let publicKeyDataBlob = { data: base.decodeSync(publicKey) };
  let keyGenPromise: cryptoFramework.KeyPair = await asyKeyGenerator.convertKey(publicKeyDataBlob, null);
  await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, keyGenPromise.pubKey, null);
  let put: cryptoFramework.DataBlob = { data: stringToUint8Array(str) };
  const finalRes = await cipher.doFinal(put)
  result = base.encodeToStringSync(finalRes.data);

} catch (err) {
  console.log(err.message)
}
return result;
}