參數爲LsaICryptUnprotectData

Question

我想調用LsaICryptUnprotectData但我得到錯誤代碼87不支持的參數。有沒有人能夠成功調用這個功能？想看看一個例子函數調用

這裏是我如何打電話，

typedef int (WINAPI *LPFUN_LSAICRYPTUNPROTECTDATA) 
(
    LPBYTE encCredData, 
    DWORD encCredDataSize, 
    DWORD reserved1, 
    DWORD reserved2, 
    DWORD reserved3, 
    DWORD reserved4, 
    DWORD dwFlags, 
    DWORD reserved5, 
    LPBYTE *decCredData, 
    LPDWORD decCredDataSize 
); 

LPFUN_LSAICRYPTUNPROTECTDATA pLsaICryptUnprotectData = (LPFUN_LSAICRYPTUNPROTECTDATA) GetProcAddress (hLsasrv, "LsaICryptUnprotectData"); 
    if(!pLsaICryptUnprotectData) 
    {return GetLastError();} 

HANDLE credfile = NULL; 
LPBYTE buffer = NULL; 
LPBYTE pDecrypted = NULL; 
DWORD dwSize = 0; 
DWORD cbsize=0; 

credfile = CreateFile(filename,GENERIC_READ,0,NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_HIDDEN|FILE_ATTRIBUTE_SYSTEM,NULL); 


dwSize = GetFileSize(credfile,NULL);  
buffer=(LPBYTE)malloc(dwSize); 
SetFilePointer(credfile,0,0,FILE_BEGIN); 
DWORD credFileSize=0; 
ReadFile(credfile,buffer,dwSize,&credFileSize,NULL) 

if(!pLsaICryptUnprotectData(buffer, dwSize, 0,0,0,0, 0, 0, &pDecrypted, &cbsize) != NULL)) 
{ 
// do error handling 
} 

Answer 1

的LsalCryptUnprotectData功能是未記錄，但this example，你可能有類似的參數嘗試：

cbSize = 0; 
pLsaICryptUnprotectData (buffer, dwSize, 0,0,0,0, 0x20000041, 0, 
    &pDecrypted, &cbSize);