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System.Security.Cryptography.SHA256Cng not implemented

Discussion in 'Windows' started by seven_, Jan 17, 2019.

  1. seven_

    seven_

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    Hi,

    I have been trying to integrate MSAL (Microsoft.Identity.Client) for some days now. Fighting several exceptions, and having found solutions, as to stripped code, I am now stuck.

    I am getting a NotSupportedException when the library tries to create a SHA256Cng object. I have looked into the created System.Core.dll, and yes, the constructor throws the exception. The original library is located in MonoBleedingEdge/lib/mono/unityaot, and also throws this exception.

    I am building with Il2CPP, .NET 4.x Equivalent, and Unity 2018.3.1. I have taken the Microsoft.Identity.Client.dll out of the latest NuGet package (2.7.0), folder net45.

    So, I am doing something wrong? Why is class SHA256Cng not implemented in the "unityaot version" of the dll? Any insights are highly appreciated!
     
    seven_, Jan 17, 2019
    #1

  2. JoshPeterson

    JoshPeterson

    Unity Technologies

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    The unityaot profile is a bit smaller than other profile implementations to improve code size. So I don't think you are doing anything wrong.

    We could consider adding the SHA256Cng implementation to unityaot, although we'll need to balance that request with code size concerns. I'm not familiar with MSAL at all. Is there an option to use a different hashing algorithm?
     
    JoshPeterson, Jan 17, 2019
    #2

  3. seven_

    seven_

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    Thanks for getting back!
    The class is needed internally, so no I cannot change this.
    (I am not sure if the next class would be missing if SHA256Cng would be added.)
    Can I somehow just use some other implementation of yours (not unityaot), which implements SHA256Cng. If so, how do I do that?
     
    seven_, Jan 17, 2019
    #3

  4. JoshPeterson

    JoshPeterson

    Unity Technologies

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    That probably depends on MSAL. If it requites SHA256Cng to be in System.Core.dll, then our only option is to consider adding it to the unityaot implementation. If MSAL has some option to bring your own hashing algorithm, then you might have an easier time replacing it.
     
    JoshPeterson, Jan 17, 2019
    #4

  5. irfanK_21

    irfanK_21

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    I am using Microsoft.IdentityModel.Clients.ActiveDirectory library for authentication and getting similar issue.
    NotSupportedException: System.Security.Cryptography.SHA256Cng

    Using Unity 2019.1.4f1, Scripting backend IL2CPP

    @seven_ Did you got any solution for this? I have used MSAL dll with unity and i am not facing any issues.
    Reference Link: https://peted.azurewebsites.net/microsoft-graph-auth-on-hololens/
     
    irfanK_21, Jun 20, 2019
    #5

  6. seven_

    seven_

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    Thanks, no, we have not tried this further, and used some other authentication method instead.
     
    seven_, Jun 21, 2019
    #6

  7. garrido86

    garrido86

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    @seven_ what is the authentication method you have used?
    @JoshPeterson Do you know of maybe other workarounds get this working under IL2CPP?
     
    garrido86, Jul 10, 2020
    #7

  8. JoshPeterson

    JoshPeterson

    Unity Technologies

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    I'm not aware of any work arounds, sorry.
     
    JoshPeterson, Jul 10, 2020
    #8

  9. seven_

    seven_

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    Probably not what you want to hear, but we are authenticating our users via their social network account now. This does not make all of them happy, but was the best compromise when also considering the work needed on our side.
     
    Last edited: Jul 14, 2020
    seven_, Jul 10, 2020
    #9

  10. Tautvydas-Zilys

    Tautvydas-Zilys

    Unity Technologies

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    Which version of MSAL are you using? SHA256Cng is not part of .NET Standard 2.0. Any .NET Standard 2.0 DLLs will not be using it.
     
    Tautvydas-Zilys, Jul 10, 2020
    #10

  11. garrido86

    garrido86

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    I got around the issue by using the NETStandard version of the nugget package. I will setup in the future a github repo so people can see how it works.
     
    garrido86, Jul 14, 2020
    #11

  12. Gisornator

    Gisornator

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    Hello @garrido86! Can you please elaborate how you could get arround that issue? We also used the nuget package but could only get the NET version to work (until we get the NotSupportedException). If we use the NETStandard version we get errors, that this assambly is not compatible.

    If you have a link to the github repo, I would highly appreciate it!
     
    Gisornator, Nov 19, 2020
    #12

  13. Mixxit

    Mixxit

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    same
     
    Mixxit, Jan 17, 2021
    #13