/// <summary>
/// Get a property of a certificate formatted as a structure
/// </summary>
public static T GetCertificateProperty <T>(this SafeCertContextHandle certificateContext,
WindowsX509Native.CertificateProperty property) where T : struct
{
return(CertificatePal.GetCertificateProperty <T>(certificateContext.DangerousGetHandle(), property));
}
/// <summary>
/// Unlike X509Store.Remove() this function also cleans up private-keys
/// </summary>
public static void RemoveCertificateFromStore(string thumbprint, StoreLocation storeLocation, string storeName)
{
var store = new X509Store(storeName, storeLocation);
store.Open(OpenFlags.ReadWrite);
var found = store.Certificates.Find(X509FindType.FindByThumbprint, thumbprint, false);
if (found.Count == 0)
{
return;
}
var certificate = found[0];
var certificateHandle = new SafeCertContextHandle(found[0].Handle, false);
// If the certificate has a private-key, remove it
if (certificateHandle.HasPrivateKey())
{
var keyProvInfo = certificateHandle.GetCertificateProperty <KeyProviderInfo>(CertificateProperty.KeyProviderInfo);
// If it is a CNG key
if (keyProvInfo.dwProvType == 0)
{
try
{
var key = CertificatePal.GetCngPrivateKey(certificateHandle);
CertificatePal.DeleteCngKey(key);
}
catch (Exception ex)
{
throw new Exception("Exception while deleting CNG private key", ex);
}
}
else // CAPI key
{
try
{
IntPtr providerHandle;
var acquireContextFlags = CryptAcquireContextFlags.Delete | CryptAcquireContextFlags.Silent;
if (storeLocation == StoreLocation.LocalMachine)
{
acquireContextFlags = acquireContextFlags | CryptAcquireContextFlags.MachineKeySet;
}
var success = Native.CryptAcquireContext(out providerHandle, keyProvInfo.pwszContainerName,
keyProvInfo.pwszProvName,
keyProvInfo.dwProvType, acquireContextFlags);
if (!success)
{
throw new CryptographicException(Marshal.GetLastWin32Error());
}
}
catch (Exception ex)
{
// Swallow keyset does not exist
if (!(ex is CryptographicException && ex.Message.Contains("Keyset does not exist")))
{
throw new Exception("Exception while deleting CAPI private key", ex);
}
}
}
}
store.Remove(certificate);
store.Close();
}
public static bool HasProperty(this SafeCertContextHandle certificateContext,
WindowsX509Native.CertificateProperty property)
{
return(CertificatePal.HasProperty(certificateContext.DangerousGetHandle(), property));
}
