internal extern static bool CertStrToName(CertEncodingType dwCertEncodingType,
                                             [MarshalAs(UnmanagedType.LPWStr)]string pszX500,
                                             StringType dwStrType,
                                             IntPtr pvReserved,
                                             byte[] pbEncoded,
                                             [In, Out]ref int pcbEncoded,
                                             [MarshalAs(UnmanagedType.LPWStr)]ref StringBuilder ppszError);

 public static unsafe extern bool CryptQueryObject(
     CertQueryObjectType dwObjectType,
     void* pvObject,
     ExpectedContentTypeFlags dwExpectedContentTypeFlags,
     ExpectedFormatTypeFlags dwExpectedFormatTypeFlags,
     int dwFlags, // reserved - always pass 0
     out CertEncodingType pdwMsgAndCertEncodingType,
     out ContentType pdwContentType,
     out FormatType pdwFormatType,
     out SafeCertStoreHandle phCertStore,
     out SafeCryptMsgHandle phMsg,
     out SafeCertContextHandle ppvContext
     );

 public static extern bool CertSaveStore(SafeCertStoreHandle hCertStore, CertEncodingType dwMsgAndCertEncodingType, CertStoreSaveAs dwSaveAs, CertStoreSaveTo dwSaveTo, ref CRYPTOAPI_BLOB pvSaveToPara, int dwFlags);

 public static extern bool CryptHashPublicKeyInfo(IntPtr hCryptProv, int algId, int dwFlags, CertEncodingType dwCertEncodingType, [In] ref CERT_PUBLIC_KEY_INFO pInfo, [Out] byte[] pbComputedHash, [In, Out] ref int pcbComputedHash);

 public static extern unsafe bool CryptEncodeObject(CertEncodingType dwCertEncodingType, [MarshalAs(UnmanagedType.LPStr)] String lpszStructType, void* pvStructInfo, [Out] byte[] pbEncoded, [In, Out] ref int pcbEncoded);

 public static unsafe extern bool CryptImportPublicKeyInfoEx2(CertEncodingType dwCertEncodingType, CERT_PUBLIC_KEY_INFO* pInfo, int dwFlags, void* pvAuxInfo, out SafeBCryptKeyHandle phKey);

 public static SafeCertStoreHandle CertOpenStore(CertStoreProvider lpszStoreProvider, CertEncodingType dwMsgAndCertEncodingType, IntPtr hCryptProv, CertStoreFlags dwFlags, String pvPara)
 {
     return CertOpenStore((IntPtr)lpszStoreProvider, dwMsgAndCertEncodingType, hCryptProv, dwFlags, pvPara);
 }

 private static extern unsafe bool CryptDecodeObjectPointer(CertEncodingType dwCertEncodingType, IntPtr lpszStructType, [In] byte[] pbEncoded, int cbEncoded, CryptDecodeObjectFlags dwFlags, [Out] void* pvStructInfo, [In, Out] ref int pcbStructInfo);

 private static extern bool CryptFormatObject(CertEncodingType dwCertEncodingType, FormatObjectType dwFormatType, FormatObjectStringType dwFormatStrType, IntPtr pFormatStruct, IntPtr lpszStructType, [In] byte[] pbEncoded, int cbEncoded, [Out] StringBuilder pbFormat, [In, Out] ref int pcbFormat);

 public static extern bool CertStrToName(CertEncodingType dwCertEncodingType, String pszX500, CertNameStrTypeAndFlags dwStrType, IntPtr pvReserved, [Out] byte[] pbEncoded, [In, Out] ref int pcbEncoded, IntPtr ppszError);

 public static extern int CertNameToStr(CertEncodingType dwCertEncodingType, [In] ref CRYPTOAPI_BLOB pName, CertNameStrTypeAndFlags dwStrType, StringBuilder psz, int csz);

 private static unsafe extern SafeCertContextHandle CertFindCertificateInStore(SafeCertStoreHandle hCertStore, CertEncodingType dwCertEncodingType, CertFindFlags dwFindFlags, CertFindType dwFindType, void* pvFindPara, CERT_CONTEXT* pPrevCertContext);

 public static unsafe extern bool CertGetIntendedKeyUsage(CertEncodingType dwCertEncodingType, CERT_INFO* pCertInfo, out X509KeyUsageFlags pbKeyUsage, int cbKeyUsage);