[PATCH] wintrust: Implement CryptCATAdminCalcHashFromFileHandle

[Juan Lang]

Hi Maarten,

overall this patch looks pretty good.  A few minor comments:

+        tempbuffer = HeapAlloc(GetProcessHeap(), 0, TEMP_BLOCK_SIZE);
+        if (!tempbuffer)
+            goto out;

You return TRUE in this case.  You probably ought to set last error
and return FALSE instead.

+        while (ReadFile(hFile, tempbuffer, TEMP_BLOCK_SIZE,
&readbytes, NULL) && readbytes)
+            CryptHashData(hash, tempbuffer, readbytes, 0);

Why not while ((ret = ReadFile...) && readbytes) instead?  This way
you can at least return failure if reading the file fails for whatever
reason.

+    SetLastError(ERROR_INSUFFICIENT_BUFFER);
     return TRUE;

Why are you setting ERROR_INSUFFICIENT_BUFFER in the success case?  If
it's just to pass that test, I think you might remove the test
instead:  in general we don't like to check last error in case of
success, unless we know an app does so.
--Juan