netcore/System.Private.CoreLib/shared/Interop/Windows/BCrypt/Interop.BCryptGenRandom.GetRandomBytes.cs

   1 // Licensed to the .NET Foundation under one or more agreements.
   2 // The .NET Foundation licenses this file to you under the MIT license.
   3 // See the LICENSE file in the project root for more information.
   4
   5 using System;
   6 using System.Diagnostics;
   7
   8 internal static partial class Interop
   9 {
  10     internal static unsafe void GetRandomBytes(byte* buffer, int length)
  11     {
  12         Debug.Assert(buffer != null);
  13         Debug.Assert(length >= 0);
  14
  15         BCrypt.NTSTATUS status = BCrypt.BCryptGenRandom(IntPtr.Zero, buffer, length, BCrypt.BCRYPT_USE_SYSTEM_PREFERRED_RNG);
  16         if (status != BCrypt.NTSTATUS.STATUS_SUCCESS)
  17         {
  18             if (status == BCrypt.NTSTATUS.STATUS_NO_MEMORY)
  19             {
  20                 throw new OutOfMemoryException();
  21             }
  22             else
  23             {
  24                 throw new InvalidOperationException();
  25             }
  26         }
  27     }
  28 }