public static bool Exists(string keyName, CngProvider provider, CngKeyOpenOptions options)
{
bool flag2;
if (keyName == null)
{
throw new ArgumentNullException("keyName");
}
if (provider == null)
{
throw new ArgumentNullException("provider");
}
if (!NCryptNative.NCryptSupported)
{
throw new PlatformNotSupportedException(System.SR.GetString("Cryptography_PlatformNotSupported"));
}
using (SafeNCryptProviderHandle handle = NCryptNative.OpenStorageProvider(provider.Provider))
{
using (SafeNCryptKeyHandle handle2 = null)
{
NCryptNative.ErrorCode code = NCryptNative.UnsafeNativeMethods.NCryptOpenKey(handle, out handle2, keyName, 0, options);
bool flag = (code == NCryptNative.ErrorCode.KeyDoesNotExist) || (code == NCryptNative.ErrorCode.NotFound);
if ((code != NCryptNative.ErrorCode.Success) && !flag)
{
throw new CryptographicException((int)code);
}
flag2 = code == NCryptNative.ErrorCode.Success;
}
}
return(flag2);
}
public static bool Exists(string keyName, CngProvider provider, CngKeyOpenOptions options)
{
if (keyName == null)
{
throw new ArgumentNullException("keyName");
}
if (provider == null)
{
throw new ArgumentNullException("provider");
}
// Make sure that NCrypt is supported on this platform
if (!NCryptNative.NCryptSupported)
{
throw new PlatformNotSupportedException(SR.GetString(SR.Cryptography_PlatformNotSupported));
}
using (SafeNCryptProviderHandle kspHandle = NCryptNative.OpenStorageProvider(provider.Provider)) {
SafeNCryptKeyHandle keyHandle = null;
try {
NCryptNative.ErrorCode error = NCryptNative.UnsafeNativeMethods.NCryptOpenKey(kspHandle,
out keyHandle,
keyName,
0,
options);
// CNG will return either NTE_NOT_FOUND or NTE_BAD_KEYSET for the case where the key does
// not exist, so we need to check for both return codes.
bool keyNotFound = error == NCryptNative.ErrorCode.KeyDoesNotExist ||
error == NCryptNative.ErrorCode.NotFound;
if (error != NCryptNative.ErrorCode.Success && !keyNotFound)
{
throw new CryptographicException((int)error);
}
return(error == NCryptNative.ErrorCode.Success);
}
finally {
if (keyHandle != null)
{
keyHandle.Dispose();
}
}
}
}
