WCF-PipeConnection.GetHashAlgorithm-now-uses-SHA256.md

WCF PipeConnection.GetHashAlgorithm now uses SHA256

Scope

Minor

Version Introduced

4.7.1

Source Analyzer Status

NotPlanned

Change Description

Starting with the .NET Framework 4.7.1, Windows Communication Foundation uses a SHA256 hash to generate random names for named pipes. In the .NET Framework 4.7 and earlier versions, it used a SHA1 hash.

• Quirked
• Build-time break

Recommended Action

If you run into compatibility issue with this change on the .NET Framework 4.7.1 or later, you can opt-out it by adding the following line to the <runtime> section of your app.config file:

<configuration>
    <runtime>
	    <AppContextSwitchOverrides value="Switch.System.ServiceModel.UseSha1InPipeConnectionGetHashAlgorithm=true" />
	</runtime>
</configuration>

Affected APIs

• Not detectable via API analysis

Category

Windows Communication Foundation (WCF)