dotnet/Documentation/compatibility/WCF-MsmqSecureHashAlgorithm-default-value-is-now-SHA256.md

WCF MsmqSecureHashAlgorithm default value is now SHA256

Scope

Minor

Version Introduced

4.7.1

Source Analyzer Status

NotPlanned

Change Description

Starting with the .NET Framework 4.7.1, the default message signing algorithm in WCF for Msmq messages is SHA256. In the .NET Framework 4.7 and earlier versions, the default message signing algorithm is SHA1.

• Quirked
• Build-time break

Recommended Action

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

<configuration>
    <runtime>
	    <AppContextSwitchOverrides value="Switch.System.ServiceModel.UseSha1InMsmqEncryptionAlgorithm=true" />
	</runtime>
</configuration>

Affected APIs

• Not detectable via API analysis

Category

Windows Communication Foundation (WCF)