private static extern SECURITY_STATUS NCryptOpenKey(SafeNCryptProviderHandle hProvider, [Out] out SafeNCryptKeyHandle phKey, string pszKeyName, int dwLegacyKeySpec, CngKeyOpenOptions dwFlags);
private static extern SECURITY_STATUS NCryptCreatePersistedKey(SafeNCryptProviderHandle hProvider,
[Out] out SafeNCryptKeyHandle phKey,
string pszAlgId,
string pszKeyName,
int dwLegacyKeySpec,
CngKeyCreationOptions dwFlags);
private static extern SECURITY_STATUS NCryptOpenStorageProvider([Out] out SafeNCryptProviderHandle phProvider, string pszProviderName, int dwFlags);