Binary Deficiency

Taka has the honor of being credited with the most posts from a single submission. I'm sure that's little consolation considering how much money his company spent on this open source¹ system, and how much effort it has taken to get it working. No less, today's code is the fourth (parts 1, 2, 3) and final piece from the encryption module.

Note that, before using these "binary math" functions, the module must convert first convert decimals into a hexadecimal string, and then convert the hex string into a binary string ...

Function Shiftbin(bin, places)
  'left shift binary 
  Shiftbin = _
    Right(bin, Len(bin) - cint(places)) & _
    Left(bin, cint(places))
End Function


Function XORbin(bin1, bin2)
  ' eXclusive OR on two binaries
  Dim output, idx
    
  For idx = 1 To Len(bin1)
    
    Select Case Mid(bin1, CInt(idx), 1)
      Case Mid(bin2, CInt(idx), 1)
        output = output & "0"
      Case Else
        output = output & "1"
      End Select
    Next
  
    XORbin = output

End Function

Function ORbin(bin1, bin2)
  ' inclusive OR on two binaries
  Dim output, idx
    
  For idx = 1 To Len(bin1)
    If Mid(bin1, cint(idx), 1) = "1" Or _
       Mid(bin2, cint(idx), 1) = "1" Then
      output = output & "1"
    Else
      output = output & "0"
    End If
  Next
    
  ORbin = output

End Function


Function ANDbin(bin1, bin2)
  ' AND function on two binaries
  
  Dim output, idx
  For idx = 1 To Len(bin1)
    If Mid(bin1, cint(idx), 1) = "1" And _
       Mid(bin2, cint(idx), 1) = "1" Then
      output = output & "1"
    Else
      output = output & "0"
    End If
  Next
    
  ANDbin = output

End Function


Function NOTbin(bin)
  ' Swaps 1's and 0's of a given binary

  Dim output, idx

  For idx = 1 To Len(bin)
    If Mid(bin, cint(idx), 1) = "1" Then
      output = output & "0"
    Else
      output = output & "1"
    End If
  Next
    
  NOTbin = output
    
End Function

¹ Open Source as in, they paid more money to have a licence to look at and modify the source code.

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