encryptAll
This simple encryption Function uses Xor encryption and itterative encoding to more securely encrypt a text string. Although the code is not unbreakable, it cannot be broken with a simple key. Itterative encoding ensures that code-cracking techniques, like character frequency study, will not work. It's as easy as could be. Function can be easily modified to encode more than strings.
Original Author: Bryan Hurley
Inputs
data As String, seed As Long Integer
Assumptions
Module is set to Option Base 1. This is to simplify the code. If you are adding this to a pre-existing module, make sure that Base Option 1 will not adversely affect your other functions, or modify the code to work off of Base Option 0.
Returns
Function returns String of encoded/decoded text.
Code
Public Function encryptAll(data As String, seed As Long) As String
Dim x As Integer, tmp As String, stepnum As Integer
Dim byteArray() As Byte, seedOffset As Integer, n As String
tmp = Trim$(Str(seed))
seed = 0
For x = 1 To Len(tmp)
n = Mid(tmp, x, 1)
seed = seed + CLng(n)
Next x
reCheckSeed:
If seed > 255 Then
seed = -1 + (seed - 255)
GoTo reCheckSeed
End If
For x = 1 To Len(data)
ReDim Preserve byteArray(x)
n = Mid(data, x, 1)
byteArray(x) = Asc(n)
stepnum = seed + x
reCheckstepnum:
If stepnum > 255 Then
stepnum = -1 + (stepnum - 255)
GoTo reCheckstepnum
End If
byteArray(x) = byteArray(x) Xor CByte(stepnum)
Next x
tmp = ""
For x = 1 To Len(data)
tmp = tmp & Chr(byteArray(x))
Next x
encryptAll = tmp
End Function
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