Decrypts a file with specified key and algorithm
#include <Crypt.au3>
_Crypt_DecryptFile ( $sSourceFile, $sDestinationFile, $vCryptKey, $iAlgID )
| $sSourceFile | File to process |
| $sDestinationFile | File to save the processed file |
| $vCryptKey | Password or handle to a key if the CALG_USERKEY flag is specified |
| $iAlgID | The algorithm to use. See _Crypt_DeriveKey(). |
| Success: | True. |
| Failure: | False and sets the @error flag to non-zero. |
| @error: | 2 - Failed to open source file 3 - Failed to open destination file 10 to 30 - Failed to create key 400+ - Failed to decrypt final piece 500+ - Failed to decrypt piece 1000+ _Crypt_Startup() failed |
_Crypt_DeriveKey, _Crypt_EncryptFile
#include <ComboConstants.au3>
#include <Crypt.au3>
#include <GUIConstantsEx.au3>
#include <MsgBoxConstants.au3>
#include <StringConstants.au3>
Example()
Func Example()
Local $iAlgorithm = $CALG_RC4
Local $hGUI = GUICreate("File Decrypter", 425, 100)
Local $idSourceInput = GUICtrlCreateInput("", 5, 5, 200, 20)
Local $idSourceBrowse = GUICtrlCreateButton("...", 210, 5, 35, 20)
Local $idDestinationInput = GUICtrlCreateInput("", 5, 30, 200, 20)
Local $idDestinationBrowse = GUICtrlCreateButton("...", 210, 30, 35, 20)
GUICtrlCreateLabel("Password:", 5, 60, 200, 20)
Local $idPasswordInput = GUICtrlCreateInput("", 5, 75, 200, 20)
Local $idCombo = GUICtrlCreateCombo("", 210, 75, 100, 20, $CBS_DROPDOWNLIST)
GUICtrlSetData($idCombo, "3DES (168bit)|AES (128bit)|AES (192bit)|AES (256bit)|DES (56bit)|RC2 (128bit)|RC4 (128bit)", "RC4 (128bit)")
Local $idDecrypt = GUICtrlCreateButton("Decrypt", 355, 70, 65, 25)
GUISetState(@SW_SHOW, $hGUI)
Local $sDestinationRead = "", $sFilePath = "", $sPasswordRead = "", $sSourceRead = ""
While 1
Switch GUIGetMsg()
Case $GUI_EVENT_CLOSE
ExitLoop
Case $idSourceBrowse
$sFilePath = FileOpenDialog("Select a file to decrypt.", "", "All files (*.*)") ; Select a file to decrypt.
If @error Then
ContinueLoop
EndIf
GUICtrlSetData($idSourceInput, $sFilePath) ; Set the inputbox with the filepath.
Case $idDestinationBrowse
$sFilePath = FileSaveDialog("Save the file as ...", "", "All files (*.*)") ; Select a file to save the decrypted data to.
If @error Then
ContinueLoop
EndIf
GUICtrlSetData($idDestinationInput, $sFilePath) ; Set the inputbox with the filepath.
Case $idCombo ; Check when the combobox is selected and retrieve the correct algorithm.
Switch GUICtrlRead($idCombo) ; Read the combobox selection.
Case "3DES (168bit)"
$iAlgorithm = $CALG_3DES
Case "AES (128bit)"
$iAlgorithm = $CALG_AES_128
Case "AES (192bit)"
$iAlgorithm = $CALG_AES_192
Case "AES (256bit)"
$iAlgorithm = $CALG_AES_256
Case "DES (56bit)"
$iAlgorithm = $CALG_DES
Case "RC2 (128bit)"
$iAlgorithm = $CALG_RC2
Case "RC4 (128bit)"
$iAlgorithm = $CALG_RC4
EndSwitch
Case $idDecrypt
$sSourceRead = GUICtrlRead($idSourceInput) ; Read the source filepath input.
$sDestinationRead = GUICtrlRead($idDestinationInput) ; Read the destination filepath input.
$sPasswordRead = GUICtrlRead($idPasswordInput) ; Read the password input.
If StringStripWS($sSourceRead, $STR_STRIPALL) <> "" And StringStripWS($sDestinationRead, $STR_STRIPALL) <> "" And StringStripWS($sPasswordRead, $STR_STRIPALL) <> "" And FileExists($sSourceRead) Then ; Check there is a file available to decrypt and a password has been set.
If _Crypt_DecryptFile($sSourceRead, $sDestinationRead, $sPasswordRead, $iAlgorithm) Then ; Decrypt the file.
MsgBox($MB_SYSTEMMODAL, "Success", "Operation succeeded.")
Else
Switch @error
Case 2
MsgBox($MB_SYSTEMMODAL, "Error", "Couldn't open the source file.")
Case 3
MsgBox($MB_SYSTEMMODAL, "Error", "Couldn't open the destination file.")
Case 30
MsgBox($MB_SYSTEMMODAL, "Error", "Failed to create the key.")
Case 400 Or 500
MsgBox($MB_SYSTEMMODAL, "Error", "Decryption error.")
Case Else
MsgBox($MB_SYSTEMMODAL, "Error", "Unexpected @error = " & @error)
EndSwitch
EndIf
Else
MsgBox($MB_SYSTEMMODAL, "Error", "Please ensure the relevant information has been entered correctly.")
EndIf
EndSwitch
WEnd
GUIDelete($hGUI) ; Delete the previous GUI and all controls.
EndFunc ;==>Example