SafeHashHandle.cs

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using Microsoft.Win32.SafeHandles;
 
namespace System.Security.Cryptography;
 
internal sealed class SafeHashHandle : SafeHandleZeroOrMinusOneIsInvalid
{
    private SafeProvHandle _parent;
 
    internal static SafeHashHandle InvalidHandle => SafeHandleCache<SafeHashHandle>.GetInvalidHandle(() => new SafeHashHandle());
 
    public SafeHashHandle()
        : base(ownsHandle: true)
    {
        SetHandle(IntPtr.Zero);
    }
 
    internal void SetParent(SafeProvHandle parent)
    {
        if (!IsInvalid && !base.IsClosed)
        {
            _parent = parent;
            bool success = false;
            _parent.DangerousAddRef(ref success);
        }
    }
 
    protected override void Dispose(bool disposing)
    {
        if (!SafeHandleCache<SafeHashHandle>.IsCachedInvalidHandle(this))
        {
            base.Dispose(disposing);
        }
    }
 
    protected override bool ReleaseHandle()
    {
        bool result = global::Interop.Advapi32.CryptDestroyHash(handle);
        SafeProvHandle parent = _parent;
        _parent = null;
        parent?.DangerousRelease();
        return result;
    }
}