Document HKDF Windows CNG breaking change in .NET 11 - #55945
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Co-authored-by: gewarren <24882762+gewarren@users.noreply.github.com>
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[WIP] Fix HKDF implementation for compatibility with .NET 11
Document HKDF Windows CNG breaking change in .NET 11
Sep 10, 2026
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Sep 10, 2026
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September 10, 2026 23:20
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Starting in .NET 11,
System.Security.Cryptography.HKDFon Windows uses the Windows CNG implementation. That implementation enforces input-size limits forDeriveKeyinput keying material andExpandpseudorandom keys, which can causeCryptographicExceptionfor inputs that worked in earlier .NET versions.Breaking change article
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