by BaMTek, Inc. (1 Submission)
Category: Miscellaneous
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Wed 24th January 2001
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
Rotate an 8 by 8 bit array. Greate as an addition to an encryption algorithm. The process takes upto 8 chars and creates an 8 by 8 bit array
VBcoders
'Create a form with for textboxes and a command button
Private Sub Command1_Click()
Dim strReturn As String
'Text1 contains the original text (up to eight chars)
'Text3 should consist of a number between 0 and 3
strReturn = RotateBitArray(Get_8_By_8_BitArray(Text1.Text), Text3.Text)
Text2.Text = strReturn
'Text4 holds to original string converted back
Text4.Text = RotateBitArray(Get_8_By_8_BitArray(strReturn), 4 - Text3.Text)
End Sub
Private Function GetBitArray(ByVal Character As String) As Byte()
'Creates an array of 8 bits based on the value of the single char
Dim bytChar As Byte
Dim strReturn As String
Dim i As Integer
Dim byReturn() As Byte
bytChar = Asc(Left(Character, 1))
Dim bytArray() As Byte
ReDim bytArray(8)
bytArray(0) = 1
bytArray(1) = 2
bytArray(2) = 4
bytArray(3) = 8
bytArray(4) = 16
bytArray(5) = 32
bytArray(6) = 64
bytArray(7) = 128
ReDim byReturn(8)
For i = 7 To 0 Step -1
If bytChar >= bytArray(i) Then
byReturn(7 - i) = 1
bytChar = bytChar - bytArray(i)
Else
byReturn(7 - i) = 0
End If
Next i
GetBitArray = byReturn
End Function
Private Function Get_8_By_8_BitArray(ByVal EightChars As String) As Byte()
'Creates an 8 by 8 bit array using 8 chars
Dim strChars As String * 8
Dim byArray() As Byte
ReDim byArray(8, 8)
strChars = EightChars
Dim i As Integer
Dim x As Integer
Dim byTemp() As Byte
For i = 0 To Len(strChars) - 1
byTemp = GetBitArray(Mid(strChars, i + 1, 1))
For x = 0 To 7
byArray(i, x) = byTemp(x)
Next x
Next i
Get_8_By_8_BitArray = byArray
End Function
Private Function RotateBitArray(ByRef byArray() As Byte, ByVal ModValue As Integer) As String
'Rotates the 8 by 8 bit array clockwise 0 - 3 times and return the resulting string
Dim i As Integer
Dim strArray() As String
Dim byTemp() As Byte
Dim x As Integer
ReDim strArray(8)
ReDim byTemp(8)
Select Case ModValue
Case 1
For i = 0 To 7
For x = 7 To 0 Step -1
byTemp(7 - x) = byArray(x, i)
Next x
strArray(i) = Chr(ConvertBitArrayToByte(byTemp))
Next i
Case 2
For i = 7 To 0 Step -1
For x = 7 To 0 Step -1
byTemp(7 - x) = byArray(i, x)
Next x
strArray(7 - i) = Chr(ConvertBitArrayToByte(byTemp))
Next i
Case 3
For i = 7 To 0 Step -1
For x = 0 To 7
byTemp(x) = byArray(x, i)
Next x
strArray(7 - i) = Chr(ConvertBitArrayToByte(byTemp))
Next i
Case Else 'Default to 0
For i = 0 To 7
For x = 0 To 7
byTemp(x) = byArray(i, x)
Next x
strArray(i) = Chr(ConvertBitArrayToByte(byTemp))
Next i
End Select
RotateBitArray = Join(strArray, vbNullString)
End Function
Private Function ConvertBitArrayToByte(ByRef BitArray() As Byte) As Byte
'Returns the byte value of a bitarray
Dim bytArray() As Byte
Dim byReturn As Byte
ReDim bytArray(8)
bytArray(7) = 1
bytArray(6) = 2
bytArray(5) = 4
bytArray(4) = 8
bytArray(3) = 16
bytArray(2) = 32
bytArray(1) = 64
bytArray(0) = 128
Dim i As Integer
For i = 0 To 7
byReturn = bytArray(i) * BitArray(i) + byReturn
Next i
ConvertBitArrayToByte = byReturn
End Function
No comments have been posted about Rotate an 8 by 8 bit array. Greate as an addition to an encryption algorithm. The process takes upt. Why not be the first to post a comment about Rotate an 8 by 8 bit array. Greate as an addition to an encryption algorithm. The process takes upt.