How to do a AES decryption in UWP, for a data encrypted using RijndaelManaged in .NET Framework?

Question

Hi,

My UWP app receives some data from Server. The server is developed in .NET Framework. The server side encrypts the using the RijndaelManaged as below

byte[] passwordKey = convertStringToByteArray("SharedKey");

                    using (var cryptoProvider = new RijndaelManaged())
                    using (var memoryStream = new MemoryStream())
                    using (var cryptoStream = new CryptoStream(memoryStream, cryptoProvider.CreateEncryptor(passwordKey, passwordKey), CryptoStreamMode.Write))
                    using (var writer = new StreamWriter(cryptoStream))
                    {
                        writer.Write(originalString);
                        writer.Flush();
                        cryptoStream.FlushFinalBlock();
                        writer.Flush();
                        return Convert.ToBase64String(memoryStream.GetBuffer(), 0, (int)memoryStream.Length);
                    }

I need to decrypt this encrypted string in UWP app. I searched in google. but unable to find any useful.

How to achieve this?

Answer 1

Hello @Petchiammal Rajumayandi ,

Welcome to Microsoft Q&A!

RijndaelManaged Class Method supports .NET Standard 2.0, 2.1, you can use it to encrypted string in UWP app.

You can follow the code sample in the official document.

1. Create an RijndaelManaged object with the specified key and IV.
2. Create a decryptor to perform the stream transform.
3. Create the streams used for decryption.
4. Read the decrypted bytes from the decrypting stream and place them in a string.

Thank you.

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