大家都知道，當您在命令行中鍵入“dir”指令后，系統都會讀出一個稱作Serial Number的十六進制數字。這個數字理論上有上億種可能，而且很難同時找到兩個序列號一樣的硬盤。這就是我這種注冊方法的理論依據，通過判斷指定磁盤的序列號決定該機器的注冊號。
要實現該功能，如何獲得指定磁盤的序列號是最關鍵的。在Windows中，有一個GetVolumeInformation的API函數，我們利用這個函數就可以實現。
下面是實現該功能所需要的代碼：
Private Declare Function GetVolumeInformation& Lib "kernel32" _
Alias "GetVolumeInformationA" (ByVal lpRootPathName As String, _
ByVal pVolumeNameBuffer As String, ByVal nVolumeNameSize As Long, _
lpVolumeSerialNumber As Long, lpMaximumComponentLength As Long, _
lpFileSystemFlags As Long, ByVal lpFileSystemNameBuffer As String, _
ByVal nFileSystemNameSize As Long)
Private Const MAX_FILENAME_LEN = 256
Public Function DriveSerial(ByVal sDrv As String) As Long
'Usage:
'Dim ds As Long
'ds = DriveSerial("C")
Dim RetVal As Long
Dim str As String * MAX_FILENAME_LEN
Dim str2 As String * MAX_FILENAME_LEN
Dim a As Long
Dim b As Long
GetVolumeInformation sDrv & ":\", str, MAX_FILENAME_LEN, RetVal, _
a, b, str2, MAX_FILENAME_LEN
DriveSerial = RetVal
End Function
如果我們需要某個磁盤的序列號的話，只要DriverSerial(該磁盤的盤符)即可。如DriverASerialNumber=DriverSerial("A")。
下面，我們就可以利用返回的磁盤序列號進行加密，需要用到一些數學知識。在這里我用了俄羅斯密碼表的加密算法對進行了數學變換的序列號進行加密。下面是注冊碼驗證部分的代碼：
Public Function IsValidate(ByVal SRC As Long, ByVal Value As String) As Boolean
Dim SourceString As String
Dim NewSRC As Long
For i = 0 To 30
If (SRC And 2 ^ i) = 2 ^ i Then
SourceString = SourceString + "1"
Else
SourceString = SourceString + "0"
End If
Next i
If SRC < 0 Then
SourceString = SourceString + "1"
Else
SourceString = SourceString + "0"
End If
Dim Table As String
Dim TableIndex As Integer
'================================================================================
'這是密碼表，根據你的要求換成別的，不過長度要一致
'================================================================================
'注意：這里的密碼表變動后，對應的注冊號生成器的密碼表也要完全一致才能生成正確的注冊號
Table = "JSDJFKLUWRUOISDH;KSADJKLWQ;ABCDEFHIHL;KLADSHKJAGFWIHERQOWRLQH"
'================================================================================
Dim Result As String
Dim MidWord As String
Dim MidWordValue As Byte
Dim ResultValue As Byte
For t = 1 To 1
For i = 1 To Len(SourceString)
MidWord = Mid(SourceString, i, 1)
MidWordValue = Asc(MidWord)
TableIndex = TableIndex + 1
If TableIndex > Len(Table) Then TableIndex = 1
ResultValue = Asc(Mid(Table, TableIndex, 1)) Mod MidWordValue
Result = Result + Hex(ResultValue)
Next i
SourceString = Result
Next t
Dim BitTORool As Integer
For t = 1 To Len(CStr(SRC))
BitTORool = SRC And 2 ^ t
For i = 1 To BitTORool
SourceString = Right(SourceString, 1) _
+ Left(SourceString, Len(SourceString) - 1)
Next i
Next t
If SourceString = Value Then IsValidate = True
End Function
最后，我們就可以利用這些子程序進行加密了。
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