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AoRaToS

Decrypt data using _Crypt_DecryptData

5 posts in this topic

#1 ·  Posted (edited)

Hello,

I am changing the way some strings are encrypted and decrypted from the old StringEncrypt to the new one.

One thing I noticed is that when you try and decrypt something that is simply blank a weird result is returned as seen in the screenshot below.

In case you want to know why this would ever happen, I have my app auto-fill an Inputbox with the decrypted variable but the decrypted variable might be blank so this is used instead.

I know how to code around it, just wondering if this result is expected, cause MSDN says something about the subject but I'm not sure this is the result it mentions.

Code used:

#include <Crypt.au3>


MsgBox(0,"",StringEncrypt(False, "", ""))


Func StringEncrypt($fEncrypt, $sData, $sPassword)
    _Crypt_Startup() ; Start the Crypt library.
    Local $sReturn = ''
    If $fEncrypt Then ; If the flag is set to True then encrypt, otherwise decrypt.
        $sReturn = _Crypt_EncryptData($sData, $sPassword, $CALG_AES_128)
    Else
        $sReturn = BinaryToString(_Crypt_DecryptData($sData, $sPassword, $CALG_AES_128))
    EndIf
    _Crypt_Shutdown() ; Shutdown the Crypt library.
    Return $sReturn
EndFunc   ;==>StringEncrypt

post-35291-0-51334100-1390331426_thumb.j

Edited by AoRaToS

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I've gotten that string many times trying to decrypt something that isn't encrypted.


If I posted any code, assume that code was written using the latest release version unless stated otherwise. Also, if it doesn't work on XP I can't help with that because I don't have access to XP, and I'm not going to.
Give a programmer the correct code and he can do his work for a day. Teach a programmer to debug and he can do his work for a lifetime - by Chirag Gude
How to ask questions the smart way!

I hereby grant any person the right to use any code I post, that I am the original author of, on the autoitscript.com forums, unless I've specifically stated otherwise in the code or the thread post. If you do use my code all I ask, as a courtesy, is to make note of where you got it from.

Back up and restore Windows user files _Array.au3 - Modified array functions that include support for 2D arrays.  -  ColorChooser - An add-on for SciTE that pops up a color dialog so you can select and paste a color code into a script.  -  Customizable Splashscreen GUI w/Progress Bar - Create a custom "splash screen" GUI with a progress bar and custom label.  -  _FileGetProperty - Retrieve the properties of a file  -  SciTE Toolbar - A toolbar demo for use with the SciTE editor  -  GUIRegisterMsg demo - Demo script to show how to use the Windows messages to interact with controls and your GUI.  -   Latin Square password generator

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AoRaToS,

I knew I had seen something like this before. This thread shows a similar thing - but it took some finding! :D

I can only suggest you code around it - the functions used in the Crypt library are direct calls to the Windows DLL and so I do not believe that there is anything AutoIt can do to prevent this from happening with empty strings. :(

M23


Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind._______My UDFs:

Spoiler

ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area

 

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The function is returning a -1 when it encounters a problem and returns an error of 20, so when you run BinaryToString(-1) you get that result. Check for errors before trying to continue and the problem goes away.


If I posted any code, assume that code was written using the latest release version unless stated otherwise. Also, if it doesn't work on XP I can't help with that because I don't have access to XP, and I'm not going to.
Give a programmer the correct code and he can do his work for a day. Teach a programmer to debug and he can do his work for a lifetime - by Chirag Gude
How to ask questions the smart way!

I hereby grant any person the right to use any code I post, that I am the original author of, on the autoitscript.com forums, unless I've specifically stated otherwise in the code or the thread post. If you do use my code all I ask, as a courtesy, is to make note of where you got it from.

Back up and restore Windows user files _Array.au3 - Modified array functions that include support for 2D arrays.  -  ColorChooser - An add-on for SciTE that pops up a color dialog so you can select and paste a color code into a script.  -  Customizable Splashscreen GUI w/Progress Bar - Create a custom "splash screen" GUI with a progress bar and custom label.  -  _FileGetProperty - Retrieve the properties of a file  -  SciTE Toolbar - A toolbar demo for use with the SciTE editor  -  GUIRegisterMsg demo - Demo script to show how to use the Windows messages to interact with controls and your GUI.  -   Latin Square password generator

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