Remove managed implementation from SP800-108 on Windows - #122816
#122816Merged
stephentoub merged 2 commits intoJan 3, 2026
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Merged
Remove managed implementation from SP800-108 on Windows#122816stephentoub merged 2 commits intodotnet:maindotnet/runtime:mainfrom vcsjones:rm-sp800108managedonwindowsvcsjones/runtime:rm-sp800108managedonwindowsCopy head branch name to clipboard
stephentoub merged 2 commits into
dotnet:maindotnet/runtime:mainfrom
vcsjones:rm-sp800108managedonwindowsvcsjones/runtime:rm-sp800108managedonwindowsCopy head branch name to clipboard
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…used for Windows 7.
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Tagging subscribers to this area: @dotnet/area-system-security, @bartonjs, @vcsjones |
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Pull request overview
This PR removes Windows 7 support from SP800-108 HMAC Counter KDF by eliminating the fallback to the managed implementation. Windows 8 and later versions have native CNG support for this algorithm, making the managed implementation unnecessary for supported Windows versions.
- Removed Windows version detection logic (
IsWindowsVersionAtLeast(6, 2)) - Simplified implementation to always use the CNG-based implementation on Windows
- Removed managed implementation file references from the Windows-specific build configuration
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| SP800108HmacCounterKdf.Windows.cs | Removed Windows version checks and simplified all methods to directly call the CNG implementation |
| System.Security.Cryptography.csproj | Removed two references to SP800108HmacCounterKdfImplementationManaged.cs from the Windows-specific ItemGroup |
stephentoub
approved these changes
Jan 3, 2026
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It was only used for Windows 7.
While we are doing some cleanup, let's get rid of a hand-rolled one-shot implementation we don't need anymore. This will be more efficient for NativeAOT.
Contributes to #71075.