我想在我的 UWP 应用程序中保护用户的 API public 和密钥

Question

我正在开发一个 UWP 应用程序，用户将被要求提供应用程序将访问的服务的 API public/secret 密钥。通常，我会将首选项存储在 ApplicationData.Current.RoamingSettings 中，但是使用 API 密钥，我想先加密它们。

如果您在下面看到，我不确定如何继续序列化 IBuffer 对象，因为我在测试如何存储它时遇到 "Data of this type is not supported"。

下面的大部分代码是从 https://docs.microsoft.com/en-us/uwp/api/windows.security.cryptography.dataprotection.dataprotectionprovider.

复制过来的

我也愿意接受其他方法来做到这一点。谢谢！

public class StaticDataProtection
    {

        private ApplicationDataContainer _roamingSettings = ApplicationData.Current.RoamingSettings;


        public async void SampleProtect()
        {
            // Initialize function arguments.
            String strMsg = "Some API key to be protected.";
            String strDescriptor = "LOCAL=user";
            BinaryStringEncoding encoding = BinaryStringEncoding.Utf8;

            // Protect a message to the local user.
            IBuffer buffProtected = await this.ProtectAsync(
                strMsg,
                strDescriptor,
                encoding);


            // FAILS
            // System.Exception: 'Data of this type is not supported.
            // Error trying to serialize the value to be written to the application data store
            _roamingSettings.Values["apiPublic"] = buffProtected;


            // How to retrieve later?
            IBuffer testRetrievedData = (IBuffer) _roamingSettings.Values["apiPublic"];



            // Decrypt the previously protected message.
            String strDecrypted = await this.UnprotectData(
                testRetrievedData, //originally buffProtected,
                encoding);


        }

        public async Task<IBuffer> ProtectAsync(
            String strMsg,
            String strDescriptor,
            BinaryStringEncoding encoding)
        {
            // Create a DataProtectionProvider object for the specified descriptor.
            DataProtectionProvider Provider = new DataProtectionProvider(strDescriptor);

            // Encode the plaintext input message to a buffer.
            encoding = BinaryStringEncoding.Utf8;
            IBuffer buffMsg = CryptographicBuffer.ConvertStringToBinary(strMsg, encoding);

            // Encrypt the message.
            IBuffer buffProtected = await Provider.ProtectAsync(buffMsg);

            // Execution of the SampleProtectAsync function resumes here
            // after the awaited task (Provider.ProtectAsync) completes.
            return buffProtected;
        }

        public async Task<String> UnprotectData(
            IBuffer buffProtected,
            BinaryStringEncoding encoding)
        {
            // Create a DataProtectionProvider object.
            DataProtectionProvider Provider = new DataProtectionProvider();

            // Decrypt the protected message specified on input.
            IBuffer buffUnprotected = await Provider.UnprotectAsync(buffProtected);

            // Execution of the SampleUnprotectData method resumes here
            // after the awaited task (Provider.UnprotectAsync) completes
            // Convert the unprotected message from an IBuffer object to a string.
            String strClearText = CryptographicBuffer.ConvertBinaryToString(encoding, buffUnprotected);

            // Return the plaintext string.
            return strClearText;
        }
    }

Answer 1

所以我要做的就是把IBuffer对象实际转换成字节数组，然后序列化存入ApplicationData。

// take in the IBuffer object
DataReader reader = DataReader.FromBuffer(buffProtected);

// make sure to use UnconsumedBufferLength to create the byte array instance
byte[] array = new byte[reader.UnconsumedBufferLength];

// read from IBuffer object into the byte array (referenced from the parameter itself)
reader.ReadBytes(array);


// finally store into the app
_roamingSettings.Values["apiPublic"] = array;



To retrieve the data later:

// cast to deserialize
byte[] deserializedArray = (byte[]) _roamingSettings.Values["apiPublic"];

// convert back into an IBuffer object
IBuffer toDecrypt = CryptographicBuffer.CreateFromByteArray(deserializedArray);

// proceed to decrypt.

我想在我的 UWP 应用程序中保护用户的 API public 和密钥

I want to protect the users' API public and secret keys in my UWP app

c#

serialization

uwp

cryptography

data-protection