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APIs Removed from System.Security.Cryptography.Pkcs netstandard2.0

  • Article

The netstandard2.0 build of the System.Security.Cryptography.Pkcs NuGet package versions 9.0.0 through 9.0.2 included APIs that are not present in .NET Framework. Calling these APIs from a .NET Standard library that runs on .NET Framework will throw MissingMemberException. These members were mistakenly included and have been removed in version 9.0.3 of the package.

Version introduced

.NET 9

Previous behavior

When referencing System.Security.Cryptography.Pkcs version 9.0.0 in a project targeting netstandard2.0, the compilation would succeed when referencing the CmsSigner.PrivateKey property. However, if the library ran on .NET Framework, accessing the property would trigger a MissingMemberException.

New behavior

Accessing any of the removed members now results in a compilation failure, rather than a runtime failure.

Type of breaking change

This is a source incompatible change.

Reason for change

The members were accidentally included due to a change in how the NuGet package was produced. As these members cannot work on .NET Framework, they should never have been listed as available to .NET Standard 2.0.

If these additional members are needed, compile specifically for a TFM that includes them, such as net8.0.

Affected APIs