SYSLIB0029: ProduceLegacyHmacValues is obsolete

The following properties are marked as obsolete, starting in .NET 6:

• HMACSHA384.ProduceLegacyHmacValues
• HMACSHA512.ProduceLegacyHmacValues

Using these APIs in code generates warning SYSLIB0029 at compile time. Producing legacy HMAC values is no longer supported.

Workarounds

None.

Suppress a warning

If you must use the obsolete APIs, you can suppress the warning in code or in your project file.

To suppress only a single violation, add preprocessor directives to your source file to disable and then re-enable the warning.

// Disable the warning.
#pragma warning disable SYSLIB0029

// Code that uses obsolete API.
// ...

// Re-enable the warning.
#pragma warning restore SYSLIB0029

To suppress all the SYSLIB0029 warnings in your project, add a <NoWarn> property to your project file.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
   ...
   <NoWarn>$(NoWarn);SYSLIB0029</NoWarn>
  </PropertyGroup>
</Project>

For more information, see Suppress warnings.