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AES/GCM/NoPadding Encryption Support in D365FO X++ Without External DLLs

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Posted on by KevinKinder

Hi Everyone,

I'm working on a D365FO integration with a third-party API.

Their requirement is:

AES-128 symmetric encryption
Randomly generated session key
SHA-256 message digest
Cipher: AES/GCM/NoPadding
Base64 encoded payload

The challenge is that in D365FO X++, the available .NET crypto support appears limited mainly to AES/CBC, and I couldn't find native support for AES/GCM directly from X++.

I would prefer to avoid creating custom C# assemblies/DLL references if possible.

Has anyone implemented AES/GCM encryption directly in X++ or found an alternative approach within D365FO without relying on external C# code?

Any suggestions, workarounds, or best practices would be greatly appreciated.

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Dynamics 365 Finance

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Martin Dráb 239,547 Most Valuable Professional on at

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There is no AES-GCM in .NET Framework BCL, as far as I know.

Nevertheless it's supported by BouncyCastle, which is used by Microsoft in F&O and therefore F&O ships with it. For example, check out Authenticated Encryption in .NET with AES-GCM.

I'm not even mentioning native X++ classes; you must be prepared for using .NET Interop for such a task (and you may soon find that creating a custom C# library is easier than trying to avoid it).

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Deepak Agarwal 8,917 on at

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On top of what Martin already mentioend , did you explored Logic apps or Function app in this case? You can have you custom logic for encryption/decryption.

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