# CryptProtectData

```csharp
[DllImport("Crypt32.dll", SetLastError = true)]
public static extern bool CryptProtectData(
   ref DATA_BLOB pDataIn,
   string szDataDescr,
   ref DATA_BLOB pOptionalEntropy,
   IntPtr pvReserved,
   ref CRYPTPROTECT_PROMPTSTRUCT pPromptStruct,
   uint dwFlags,
   ref DATA_BLOB pDataOut
);
```

Microsoft documentation: [Link](https://docs.microsoft.com/en-us/windows/win32/api/dpapi/nf-dpapi-cryptprotectdata)