diff --git a/trunk/MakeMasterKey/src/MakeMasterKeyForCtr.cpp b/trunk/MakeMasterKey/src/MakeMasterKeyForCtr.cpp
new file mode 100644
index 0000000..6fa4fbb
--- /dev/null
+++ b/trunk/MakeMasterKey/src/MakeMasterKeyForCtr.cpp
@@ -0,0 +1,95 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define CODE_LENGTH 8
+
+typedef unsigned char u8;
+typedef unsigned short int u16;
+typedef unsigned long u32;
+typedef unsigned long long int u64;
+
+typedef signed char s8;
+typedef signed short int s16;
+typedef signed long s32;
+
+u32     table[0x100];
+
+
+//==========================================================================
+//
+//==========================================================================
+void _Crc32Init( void )
+{
+u32     poly = 0xedba6320;  // DS‚Ì‚Æ‚« 0xedb88320;
+u32     crc;
+
+    for( u32 i = 0; i < 0x100; i++ )
+    {
+        crc = i;
+        for( u32 j = 8; j > 0; j-- )
+        {
+            if( crc & 1 )
+            {
+                crc = (crc>>1)^poly;
+            }
+            else
+            {
+                crc >>= 1;
+            }
+        }
+        table[i] = crc;
+    }
+}
+
+//==========================================================================
+//
+//==========================================================================
+u32 _CalcCrc32( const u8 *src, u32 len )
+{
+u32     crc = 0xffffffff;
+
+    while( len )
+    {
+        crc = ((crc>>8)&0xffffffff)^table[(crc^(*src))&0xff];
+        src++;
+        len--;
+    }
+    return crc;
+}
+
+//==========================================================================
+//
+//==========================================================================
+u32 _CalcMasterkey( const u8 *src )
+{
+u32     key;
+
+    _Crc32Init();
+
+    //key = ((_CalcCrc32( src, CODE_LENGTH )^0xaaaa)+5313)%100000;
+    key = ((_CalcCrc32( src, CODE_LENGTH )^0xaaaa)+5719)%100000;
+    return key;
+}
+
+//==========================================================================
+//
+//==========================================================================
+int main( int argc, char *argv[] )
+{
+u32     masterKey;
+
+    if ( ( argc != 2 ) || ( argv[1] == NULL ) )
+    {
+        printf( "usage: MakeMasterKeyForCtr [date+code]\n" );
+        printf( "\n" );
+        printf( "example: date = Sep 8. code = 1234\n" );
+        printf( "         MakeMasterKeyForCtr 09081234\n" );
+        return 1;
+    }
+
+    masterKey = _CalcMasterkey( (const u8*)argv[1] );
+
+    printf( "Master Key = %05d\n", masterKey );
+
+    return 0;
+}