SafeKeyHandle.cs

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using System;
using System.Runtime.InteropServices;
using Microsoft.Win32.SafeHandles;
 
namespace Internal.NativeCrypto;
 
internal sealed class SafeKeyHandle : Microsoft.Win32.SafeHandles.SafeBCryptHandle
{
    private Internal.NativeCrypto.SafeAlgorithmHandle _parentHandle;
 
    public void SetParentHandle(Internal.NativeCrypto.SafeAlgorithmHandle parentHandle)
    {
        bool success = false;
        parentHandle.DangerousAddRef(ref success);
        _parentHandle = parentHandle;
    }
 
    protected sealed override bool ReleaseHandle()
    {
        if (_parentHandle != null)
        {
            _parentHandle.DangerousRelease();
            _parentHandle = null;
        }
        uint num = BCryptDestroyKey(handle);
        return num == 0;
    }
 
    [DllImport("BCrypt.dll")]
    private static extern uint BCryptDestroyKey(IntPtr hKey);
}