SYSLIB0048: RSA.EncryptValue and DecryptValue are obsolete

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

• System.Security.Cryptography.RSA.EncryptValue(Byte[])
• System.Security.Cryptography.RSA.DecryptValue(Byte[])
• System.Security.Cryptography.RSACryptoServiceProvider.EncryptValue(Byte[])
• System.Security.Cryptography.RSACryptoServiceProvider.DecryptValue(Byte[])

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

• RSA.EncryptValue and RSA.DecryptValue are obsolete