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[API Proposal]: Add CompositeMLDsa property to CngAlgorithm and CngAlgorithmGroup #130052
Description
Background and motivation
Windows CNG now supports Composite ML-DSA. This API proposal exposes the relevant constants in .NET so they can be used in our CNG APIs (like CngKey.Create).
API Proposal
public sealed partial class CngAlgorithm
{
[Experimental("SYSLIB5006", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public static CngAlgorithm CompositeMLDsa { get; }
}
public sealed partial class CngAlgorithmGroup
{
[Experimental("SYSLIB5006", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public static CngAlgorithmGroup CompositeMLDsa { get; }
}We omitted this from the original Composite ML-DSA proposal (#118320) because we did not know how Windows would expose Composite ML-DSA in CNG.
The documentation for the CngAlgorithm constant is here.
Note that the constant for CngAlgorithmGroup is not documented (it should be here) but it can be inferred from the rest. We have already done the same for ML-DSA.
Activity
dotnet-policy-service commentedon Jun 30, 2026
Tagging subscribers to this area: @bartonjs, @vcsjones, @dotnet/area-system-security
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Add CompositeMLDsa CNG (NCrypt) (#130053)
bartonjs commentedon Aug 11, 2026
Video
Expose Composite ML-DSA CNG identifiers (#132353)