WebAssembly: Aes.Create() throws System.PlatformNotSupportedException

[AliGuemues]

Hello,

I switched from ASP .NET Core 3.1 to ASP .NET 5 RC-1. I use the current Visual Studio 2019 Preview (Version 16.8.0 Preview 3.0).

I have following issue: I created a Blazor PWA application with AES-Encryption. So everthing works fine in .NET Core 3.1 after the method Aes.Create() is called. By switching to ASP .NET 5 RC-1 I get a System.PlatformNotSupportedException after Aes.Create() is called:

System.Security.Cryptography.Algorithms is not supported on this platform

System.PlatformNotSupportedException: System.Security.Cryptography.Algorithms is not supported on this platform.\n   
at System.Security.Cryptography.Aes.Create()

I already read the breaking changes from .NET Core 3.1 to .NET 5 but dont found anything related to this issue.

Thanks in advance!

[campersau]

See #40076 (comment) and the comment below.

Tagging subscribers to this area: @bartonjs, @vcsjones, @krwq, @jeffhandley
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[marek-safar]

Related to #40074

[jeffhandley]

@AliGuemues Would you be able to share more about the scenario you're using Aes for within the browser? While looking at the APIs folks have reported needing in the browser, we're also trying to better understand the functionality that needs to be accomplished.

[AliGuemues]

@jeffhandley So basically we want to port a UWP application to Blazor. We have encrypted data on a Blob-Storage which would be decrypted inside the UWP application. Any new or changed data from our UWP application would be encrypted again and send to the Blob-Storage.

We want to port this behaviour to a potencial Blazor (PWA) application.