SYSLIB0048: RSA.EncryptValue and RSA.DecryptValue are obsolete

The following methods are obsolete, starting in .NET 8. Calling them in code generates warning SYSLIB0048 at compile time.

Workaround

Use RSA.Encrypt and RSA.Decrypt instead.

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 SYSLIB0048

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

// Re-enable the warning.
#pragma warning restore SYSLIB0048

To suppress all the SYSLIB0048 warnings in your project, add a <NoWarn> property to your project file.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
   ...
   <NoWarn>$(NoWarn);SYSLIB0048</NoWarn>
  </PropertyGroup>
</Project>

For more information, see Suppress warnings.

See also