通用密钥库加解密，用户需要将重要的密码数据存储在本地

function GetAesEncryptProperties() { 
  let properties: Array<huks.HuksParam> = new Array(); 
  let index = 0; 
  properties[index++] = { 
    tag: huks.HuksTag.HUKS_TAG_ALGORITHM, 
    value: huks.HuksKeyAlg.HUKS_ALG_AES 
  }; //指定算法 
  properties[index++] = { 
    tag: huks.HuksTag.HUKS_TAG_KEY_SIZE, 
    value: huks.HuksKeySize.HUKS_AES_KEY_SIZE_128 
  }; //指定密钥长度 
  properties[index++] = { 
    tag: huks.HuksTag.HUKS_TAG_PURPOSE, 
    value: huks.HuksKeyPurpose.HUKS_KEY_PURPOSE_ENCRYPT 
  } //指定密钥用途 
  properties[index++] = { 
    tag: huks.HuksTag.HUKS_TAG_PADDING, 
    value: huks.HuksKeyPadding.HUKS_PADDING_PKCS7 
  } //指定密钥填充格式 
  properties[index++] = { 
    tag: huks.HuksTag.HUKS_TAG_BLOCK_MODE, 
    value: huks.HuksCipherMode.HUKS_MODE_CBC 
  }//指定密钥格式 
  properties[index++] = { 
    tag: huks.HuksTag.HUKS_TAG_IV, 
    value: StringToUint8Array(IV) 
  }//偏移量 
  return properties; 
} 
export async function GenerateAesKey(aesKeyAlias:string) { 
  let genProperties = GetAesGenerateProperties(); 
  let options: huks.HuksOptions = { 
    properties: genProperties 
  } 
  await huks.generateKeyItem(aesKeyAlias, options) 
    .then((data) => { 
      console.info(`callback: generate AES Key success, data = ${JSON.stringify(data)}`); 
      AlertDialog.show({message: '密钥生成成功：'+aesKeyAlias }); 
    }).catch((error: BusinessError)=>{ 
      console.error(`callback: generate AES Key failed`); 
      AlertDialog.show({message: '密钥生成失败：'+aesKeyAlias}); 
    }) 
}
let handle:number; 
let cipherData:Uint8Array; 
export async function EncryptData(aesKeyAlias:string,plainText:string) { 
//plainText需小于100k 
  let encryptProperties = GetAesEncryptProperties(); 
  let options: huks.HuksOptions = { 
    properties: encryptProperties, 
    inData: StringToUint8Array(plainText) 
  } 
  await huks.initSession(aesKeyAlias, options) 
    .then((data) => { 
      handle = data.handle; 
    }).catch((error: BusinessError)=>{ 
      AlertDialog.show({message: '错误码：'+error.code+`加密初始化失败`}); 
    }) 
  await huks.finishSession(handle, options) 
    .then((data) => { 
      cipherData = data.outData as Uint8Array; 
      AlertDialog.show({message: '加密成功：密文是：'+Uint8ArrayToString(data.outData as Uint8Array)}); 
    }).catch((error: BusinessError)=>{ 
      AlertDialog.show({message: '错误码：'+error.code+`最终加密失败`}); 
    }) 
  return cipherData; 
}
export async function DecryptData(aesKeyAlias:string,cipherData:Uint8Array) { 
  let decryptOptions = GetAesDecryptProperties() 
  let options: huks.HuksOptions = { 
    properties: decryptOptions, 
    inData: cipherData 
  } 
  let a = await huks.initSession(aesKeyAlias, options); 
  handle = a.handle 
  try { 
    let b = await huks.finishSession(handle, options) 
    AlertDialog.show({ message: Uint8ArrayToString(b.outData as Uint8Array) }); 
  } catch (err) { 
    AlertDialog.show({ message: err.message }); 
  } 
}
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