password.frm
VERSION 4.00
Begin VB.Form Form1
Caption = "Beispiel Ver- & Entschlüsselung von Passwörtern"
ClientHeight = 4035
ClientLeft = 1140
ClientTop = 1515
ClientWidth = 7305
Height = 4440
Left = 1080
LinkTopic = "Form1"
ScaleHeight = 4035
ScaleWidth = 7305
Top = 1170
Width = 7425
Begin VB.TextBox Text2
Height = 375
Left = 5880
TabIndex = 5
Top = 600
Width = 735
End
Begin VB.TextBox Text1
Height = 615
Left = 600
MultiLine = -1 'True
TabIndex = 4
Top = 3000
Width = 6015
End
Begin VB.CommandButton Command3
Caption = "neuen Text setzen"
Height = 375
Left = 600
TabIndex = 3
Top = 2160
Width = 2415
End
Begin VB.CommandButton Command2
Caption = "Entschlüsseln"
Height = 375
Left = 1920
TabIndex = 2
Top = 600
Width = 1215
End
Begin VB.CommandButton Command1
Caption = "Verschlüsseln"
Height = 375
Left = 600
TabIndex = 0
Top = 600
Width = 1215
End
Begin VB.Label Label5
Alignment = 1 'Right Justify
Caption = "© A.Gamper"
Height = 255
Left = 4560
TabIndex = 9
Top = 3720
Width = 2655
End
Begin VB.Label Label4
Caption = "Nur für Passwörter , keine langen Texte"
Height = 255
Left = 3360
TabIndex = 8
Top = 2280
Width = 3255
End
Begin VB.Label Label3
Alignment = 2 'Center
Caption = "ungültig"
BeginProperty Font {0BE35203-8F91-11CE-9DE3-00AA004BB851}
Name = "MS Sans Serif"
Size = 8.25
Charset = 0
Weight = 700
Underline = 0 'False
Italic = 0 'False
Strikethrough = 0 'False
EndProperty
ForeColor = &H000000FF&
Height = 255
Left = 5760
TabIndex = 7
Top = 360
Visible = 0 'False
Width = 975
End
Begin VB.Label Label2
Caption = "Ver- && Entschlüsselungsbyte ( <11 )"
Height = 615
Left = 4080
TabIndex = 6
Top = 480
Width = 1695
End
Begin VB.Label Label1
BorderStyle = 1 'Fixed Single
Caption = "Testtext"
Height = 495
Left = 600
TabIndex = 1
Top = 1200
Width = 6015
End
End
Attribute VB_Name = "Form1"
Attribute VB_Creatable = False
Attribute VB_Exposed = False
Function DecryptPassword(Number As Byte, EncryptedPassword As String)
Dim Password As String, Counter As Byte
Dim Temp As Integer
On Error Resume Next
Counter = 1
Do Until Counter = Len(EncryptedPassword) + 1
Temp = Asc(Mid(EncryptedPassword, Counter, 1)) Xor (10 - Number)
If Counter Mod 2 = 0 Then
Temp = Temp + Number
Else
Temp = Temp - Number
End If
Password = Password & Chr$(Temp)
Counter = Counter + 1
Loop
DecryptPassword = Password
'wohin soll das verschlüsselte Password geschrieben werden
'In die Form
Label1.Caption = DecryptPassword
End Function
Function EncryptPassword(Number As Byte, DecryptedPassword As String)
Dim Password As String, Counter As Byte
Dim Temp As Integer
On Error Resume Next
Counter = 1
Do Until Counter = Len(DecryptedPassword) + 1
Temp = Asc(Mid(DecryptedPassword, Counter, 1))
If Counter Mod 2 = 0 Then
Temp = Temp - Number
Else
Temp = Temp + Number
End If
Temp = Temp Xor (10 - Number)
Password = Password & Chr$(Temp)
Counter = Counter + 1
Loop
EncryptedPassword = Password
'wohin soll das entschlüsselte Password geschrieben werden
'In die Form
Label1.Caption = EncryptedPassword
End Function
Private Sub Command1_Click()
'nur zum Fehler abfangen, da Eingaben über 10 Fehler verursachen und die Eingabe von Buchstaben keine sichere Verschlüsselung ergibt
'Verschlüsselung mit C läßt sich mit allen anderen Buchstaben wieder entschlüsseln
If Text2.Text = "0" Or Text2.Text = "1" Or Text2.Text = "2" Or Text2.Text = "3" Or Text2.Text = "4" Or Text2.Text = "5" Or Text2.Text = "6" Or Text2.Text = "7" Or Text2.Text = "8" Or Text2.Text = "9" Or Text2.Text = "10" Then
Label3.Visible = False
Call DecryptPassword(Val(Text2.Text), Label1.Caption)
Else
Label3.Visible = True
End If
End Sub
Private Sub Command2_Click()
If Text2.Text = "0" Or Text2.Text = "1" Or Text2.Text = "2" Or Text2.Text = "3" Or Text2.Text = "4" Or Text2.Text = "5" Or Text2.Text = "6" Or Text2.Text = "7" Or Text2.Text = "8" Or Text2.Text = "9" Or Text2.Text = "10" Then
Label3.Visible = False
Call EncryptPassword(Val(Text2.Text), Label1.Caption)
Else
Label3.Visible = True
End If
End Sub
Private Sub Command3_Click()
If Len(Text1.Text) > 3 Then
Label1.Caption = Text1.Text
End If
End Sub