Generate registration keys just like WinZip's :)
Generates registration key based on name.
Original Author: DarkMan
Inputs
Name
Assumptions
This could be used if you would like registered owners of WinZip to be able to also use your code.
Obviously you should not use it to generate keys for WinZip if you have not purchased it.
Returns
Licence Key
Code
'Thanks to R!SC for the assembler version which this is based on
Public Function GenerateKey(ByVal Name As String) As String
Dim lPart1 As Long
Dim lPart2 As Long
Dim ch As Long
Dim i As Long
Dim n As Long
'Name is trimmed and restricted to 40
Name = Trim$(Name)
Name = Mid$(Name, 1, 40)
If Len(Name) = 0 Then
Exit Function
End If
'The key is made up of two parts, both 4 digit hex values
'Part1 is quite tricky
For i = 1 To Len(Name)
ch = Asc(Mid$(Name, i, 1)) * &H100
'Run through the calculations 8 times for each character
For n = 1 To 8
'Do different things based on the result of this wierd if
If (((ch Xor lPart1) Mod &H10000) And &H8000&) = 0 Then
'Bit shift 1 bit left
lPart1 = lPart1 And &HFFFFFFF
lPart1 = lPart1 * 2
Else
'Bit shift 1 bit left
lPart1 = lPart1 And &HFFFFFFF
lPart1 = lPart1 * 2
'Xor with the magic number
lPart1 = lPart1 Xor &H1021&
End If
ch = ch * 2
Next n
Next i
'Add a bit for luck
lPart1 = lPart1 + &H63&
'Only want 4 digits
lPart1 = lPart1 Mod &H10000
'Part2 is very simple
For i = 1 To Len(Name)
lPart2 = lPart2 + (Asc(Mid$(Name, i, 1)) * (i - 1))
Next i
'Build up from 2 parts (making sure each part is 4 digits)
GenerateKey = String$(4 - Len(CStr(Hex(lPart1))), "0") _
& CStr(Hex(lPart1)) _
& String$(4 - Len(CStr(Hex(lPart2))), "0") _
& CStr(Hex(lPart2))
End Function
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