Started work on updated crypto

git-svn-id: https://svn.code.sf.net/p/vbam/code/trunk@529 a31d4220-a93d-0410-bf67-fe4944624d44

src/win32/VBA.cpp

@@ -506,8 +506,6 @@ BOOL VBA::InitInstance()
 
 if (check != 0)
   {
-	   MessageBox(NULL, "Go to hell, dont pass GO. Don't collect $200.",
-		   szEXEFileName, MB_ICONSTOP|MB_OK);
 	   ExitProcess(0);
   }
 	  

src/win32/protect.c

@@ -16,6 +16,20 @@ int ExecutableValid(const char *executable_filename)
 
 #else
 
+void unprotect_buf(char *buffer, size_t buffer_len)
+{
+  char *end_p = buffer+buffer_len, previous = 0x11;
+  while (buffer < end_p)
+  {
+    char current = *buffer;
+    *buffer ^= previous;
+    previous = current;
+    *buffer -= 25;
+    *buffer ^= 0x87;
+    ++buffer;
+  }
+}
+
 static uint8_t *memmem(const uint8_t *haystack, size_t haystacklen, const uint8_t *needle, size_t needlelen)
 {
   if (needlelen)

src/win32/protect.h

@@ -8,6 +8,7 @@ extern "C" {
 //Returns 0 on success, 1 on failure, and <0 when an error occured
 //Note, can only be called once per execution
 int ExecutableValid(const char *executable_filename);
+void unprotect_buf(char *buffer, size_t buffer_len)
 
 #if defined(__cplusplus)
 }