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Monday, 14 May 2012

Excel : Unlock Workbook And Unlock Worksheet

If you have forgotten your workbook or worksheet password. You will find below information helpful to unprotect excel workbook or worksheet password

The code below can unlock a workbook password and sheet passwords
Module provides Excel workbook and sheet unlock routines. The algorithm
relies on a backdoor password that can be 1 to 9 characters long where each
character is either an "A" or "B" except the last which can be any character
from ASCII (American Standard Code for Information Interchange) code 32 to 255.Implemented as a regular module for use with any Excel VBA project.

Code by : Kevin M. Jones

Option Explicit
Private Sub DisplayStatus( _
ByVal PasswordsTried As Long _
)
' Display the status in the Excel status bar.
' Syntax
' DisplayStatus(PasswordsTried)
' PasswordsTried - The number of passwords tried thus far.
Static LastStatus As String
LastStatus = Format(PasswordsTried / 57120, "0%") & " of possible passwords tried."
If Application.StatusBar <> LastStatus Then
Application.StatusBar = LastStatus
DoEvents
End If
End Sub
Private Function TrySheetPasswordSize( _
ByVal Size As Long, _
ByRef PasswordsTried As Long, _
ByRef Password As String, _
Optional ByVal Base As String _
) As Boolean
' Try unlocking the sheet with all passwords of the specified size.
' TrySheetPasswordSize(Size, PasswordsTried, Password, [Base])
' Size - The size of the password to try.
' PasswordsTried - The cummulative number of passwords tried thus far.
' Password - The current password.
' Base - The base password from the calling routine.
Dim Index As Long
On Error Resume Next
If IsMissing(Base) Then Base = vbNullString
If Len(Base) < Size - 1 Then
For Index = 65 To 66
If TrySheetPasswordSize(Size, PasswordsTried, Password, Base & Chr(Index)) Then
TrySheetPasswordSize = True
Exit Function
End If
Next Index
ElseIf Len(Base) < Size Then
For Index = 32 To 255
ActiveSheet.Unprotect Base & Chr(Index)
If Not ActiveSheet.ProtectContents Then
TrySheetPasswordSize = True
Password = Base & Chr(Index)
Exit Function
End If
PasswordsTried = PasswordsTried + 1
Next Index
End If
On Error GoTo 0
DisplayStatus PasswordsTried
End Function

 
Private Function TryWorkbookPasswordSize( _
ByVal Size As Long, _
ByRef PasswordsTried As Long, _
ByRef Password As String, _
Optional ByVal Base As String _
) As Boolean
' Try unlocking the workbook with all passwords of the specified size.
' TryWorkbookPasswordSize(Size, PasswordsTried, Password, [Base])
' Size - The size of the password to try.
' PasswordsTried - The cummulative number of passwords tried thus far.
' Password - The current password.
' Base - The base password from the calling routine.
Dim Index As Long
On Error Resume Next
If IsMissing(Base) Then Base = vbNullString
If Len(Base) < Size - 1 Then
For Index = 65 To 66
If TryWorkbookPasswordSize(Size, PasswordsTried, Password, Base & Chr(Index)) Then
TryWorkbookPasswordSize = True
Exit Function
End If
Next Index
ElseIf Len(Base) < Size Then
For Index = 32 To 255
ActiveWorkbook.Unprotect Base & Chr(Index)
If Not ActiveWorkbook.ProtectStructure And Not ActiveWorkbook.ProtectWindows Then
TryWorkbookPasswordSize = True
Password = Base & Chr(Index)
Exit Function
End If
PasswordsTried = PasswordsTried + 1
Next Index
End If
On Error GoTo 0
DisplayStatus PasswordsTried
End Function

 

Public Sub UnlockSheet()

' Unlock the active sheet using a backdoor Excel provides where an alternate

' password is created that is more limited.

Dim PasswordSize As Variant
Dim PasswordsTried As Long
Dim Password As String
PasswordsTried = 0
If Not ActiveSheet.ProtectContents Then
MsgBox "The sheet is already unprotected."
Exit Sub
End If
On Error Resume Next
ActiveSheet.Protect ""
ActiveSheet.Unprotect ""
On Error GoTo 0
If ActiveSheet.ProtectContents Then
For Each PasswordSize In Array(5, 4, 6, 7, 8, 3, 2, 1)
If TrySheetPasswordSize(PasswordSize, PasswordsTried, Password) Then Exit For
Next PasswordSize
End If
If Not ActiveSheet.ProtectContents Then
MsgBox "The sheet " & ActiveSheet.Name & " has been unprotected with password '" & Password & "'."
End If
Application.StatusBar = False
End Sub

 

Public Sub UnlockWorkbook()
' Unlock the active workbook using a backdoor Excel provides where an alternate
' password is created that is more limited.
Dim PasswordSize As Variant
Dim PasswordsTried As Long
Dim Password As String
PasswordsTried = 0
If Not ActiveWorkbook.ProtectStructure And Not ActiveWorkbook.ProtectWindows Then
MsgBox "The workbook is already unprotected."
Exit Sub
End If
On Error Resume Next
ActiveWorkbook.Unprotect vbNullString
On Error GoTo 0
If ActiveWorkbook.ProtectStructure Or ActiveWorkbook.ProtectWindows Then
For Each PasswordSize In Array(5, 4, 6, 7, 8, 3, 2, 1)
If TryWorkbookPasswordSize(PasswordSize, PasswordsTried, Password) Then Exit For
Next PasswordSize
End If
If Not ActiveWorkbook.ProtectStructure And Not ActiveWorkbook.ProtectWindows Then
MsgBox "The workbook " & ActiveWorkbook.Name & " has been unprotected with password '" & Password & "'."
End If
Application.StatusBar = False
End Sub

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