SafeCertContextHandle.cs

using Microsoft.Win32.SafeHandles;
using System.Runtime.ConstrainedExecution;
using System.Runtime.InteropServices;

namespace System.Security.Cryptography
{
    internal sealed class SafeCertContextHandle : SafeHandleZeroOrMinusOneIsInvalid
    {
        internal static SafeCertContextHandle InvalidHandle => new SafeCertContextHandle(IntPtr.Zero);

        private SafeCertContextHandle()
            : base(ownsHandle: true)
        {
        }

        internal SafeCertContextHandle(IntPtr handle)
            : base(ownsHandle: true)
        {
            SetHandle(handle);
        }

        [DllImport("crypt32.dll", SetLastError = true)]
        [SuppressUnmanagedCodeSecurity]
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        private static extern bool CertFreeCertificateContext(IntPtr pCertContext);

        protected override bool ReleaseHandle()
        {
            return CertFreeCertificateContext(handle);
        }
    }
}