Type Definition winapi::um::wincrypt::PFN_CMSG_CNG_IMPORT_CONTENT_ENCRYPT_KEY

type PFN_CMSG_CNG_IMPORT_CONTENT_ENCRYPT_KEY = Option<unsafe extern "system" fn(pCNGContentDecryptInfo: PCMSG_CNG_CONTENT_DECRYPT_INFO, dwFlags: DWORD, pvReserved: *mut c_void) -> BOOL>;