关于国密SM4加密，想了解一下HarmonyOS的国密SM4加密解密代码怎么写？

.onClick(async () => { 
  const symAlgName = 'SM4_128' 
  const sKey: string = "9f35eda67432c4ae3892305801b9d0b6"; 
  const symKeyData = buffer.from(sKey, 'hex') 
  let symKeyBlob: cryptoFramework.DataBlob = { data: new Uint8Array(symKeyData.buffer) }; 
  try { 
    let aesGenerator = cryptoFramework.createSymKeyGenerator(symAlgName); 
    let symKey = await aesGenerator.convertKey(symKeyBlob); 
    console.log(`wsf: sm4 转密钥成功`) 
 
    let plainText: cryptoFramework.DataBlob = { data: new Uint8Array(buffer.from('This is a test', 'utf-8').buffer) }; 
    const cipher = cryptoFramework.createCipher('SM4_128|ECB|PKCS7') 
    await cipher.init(cryptoFramework.CryptoMode.ENCRYPT_MODE, symKey, null) 
    const encryptData = await cipher.doFinal(plainText) 
    console.log(`wsf: 加密成功`) 
 
    let decoder = cryptoFramework.createCipher('SM4_128|ECB|PKCS7'); 
    await decoder.init(cryptoFramework.CryptoMode.DECRYPT_MODE, symKey, null); 
    let decryptData = await decoder.doFinal(encryptData); 
    console.log(`wsf: 解密成功 ${buffer.from(decryptData.data).toString()}`) 
  } catch (e) { 
    console.error(`wsf: 转密钥报错 e = ${e.code} ${e.message}`) 
  } 
})