[SOLVED] Need to crypt a text and decrypt (md5)

Hello everybody and thanks for your time .

I got a trouble with my script , i can encrypt my text but i dont understand how to decrypt it .

I encrypt the text with this line of code :

Code (CSharp):

1. JSONObject response = new JSONObject (CommUnity.Instance.ReturnResponse(CommUnity.Instance.commUnityURL + "/api.php",
2. "sendMessage", "username="+CommUnity.Instance.userInfo[0]+
3. "&password="+CommUnity.Instance.userInfo[1]+
4. "&id="+id+"
5. &text="+TypeConversion.Md5Sum(CommUnity.Instance.pwdSalt +
6. panel[6].transform.Find("Msg").gameObject.GetComponent<InputField>().text)));
7.  

to to get the message back i use this line code :

Code (CSharp):

1.  inst.transform.Find("News/Background/Text")
2. .gameObject.GetComponent<Text>().text =
3. response["Messages"][i]["Text"].str;
4.  

Please can you help me to decrypt the text , like this i got the encrypted text .

Thank for your help i really appreciate and sorry for my bad english i'm french

 

Woah! Firstly you really need to split your code up over several lines. It's impossible to read and debug when it's written like that.

As to your question - you can't "decrypt" what you're doing. You're using MD5 to "encrypt" your data. MD5 isn't actually encryption, it's a one way hash function. That means that you can't reverse it. If you want to encrypt and decrypt text you'll have to use some kind of cryptographic cipher instead. You could use a simple XOR cipher or public-key encryption.

Sam

 

Ho now i see , thanks sam i will take a look in other encryption decryption methode.
Do you know a the most simple, basic way ?

 

Yep the XOR cipher that I mentioned above is a very simple encryption algorithm. It's also very easy to crack.

Sam

 

How secure do you need it to be? The simplest is base64, but any engineer would immediately recognize it as such and be able to decrypt it. You could probably do a simple substitution cipher, maybe combined with something like base64. This is security through obfuscation.

You could also do a public key system. It's quite easy, you just need to have a way to have a string of text be used to encrypt and decrypt your values. From there you use a series of messages to establish a secure connection

Client A generates a key and then encrypts the key using itself, that then gets sent to Client X
Client B generates a key, receives the encrypted package and encrypts it again using it's own key, then sends it back
Client A then decrypts the package using it's own key and sends it back
Client B then takes the package and decrypts it using it's own key.

Client B now has Client A's randomly generated key and they can communicate using said key. It'll be different every single time, and there is never an unencrypted key sent anywhere.

 

I need a very basic encryption something easy to do for a noob , i find something seam to be very easy to encrypt but i still get trouble with the decrypt


here the code to encrypt :

Code (CSharp):

1. AvoEx.AesEncryptor.Encrypt( panel[6].transform.Find("Msg").gameObject.GetComponent<InputField>().text)));

and here the normally code to decrypt :

Code (CSharp):

1. AvoEx.AesEncryptor.DecryptString(response["Messages"][i]["Text"].str);

but i get error when i try decrypt

can you help me ?

I use AES Encryptor
https://www.assetstore.unity3d.com/en/?stay#!/content/39501

 

Just curious, but why are you trying to deal with encryption/decryption? Are you hooking into your own backend service?

Also, when you get an error, you should post what error you get.

 

hey brathnann , i just like to solve any problem when i'm getting stuck , that's how i learn

here is the long error code :

Code (CSharp):

1. FormatException: Invalid length.
2. System.Convert.FromBase64String (System.String s) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System/Convert.cs:146)
3. AvoEx.AesEncryptor.DecryptString (System.String encrypted) (at Assets/AvoEx/AesEncryptor/AesEncryptor.cs:121)
4. Body.ShowMessages () (at Assets/CommUnity/Scripts/Body.cs:446)
5. Header.MessagesBtn () (at Assets/CommUnity/Scripts/Header.cs:44)
6. UnityEngine.Events.InvokableCall.Invoke () (at C:/buildslave/unity/build/Runtime/Export/UnityEvent.cs:166)
7. UnityEngine.Events.UnityEvent.Invoke () (at C:/buildslave/unity/build/Runtime/Export/UnityEvent_0.cs:58)
8. UnityEngine.UI.Button.Press () (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Button.cs:36)
9. UnityEngine.UI.Button.OnPointerClick (UnityEngine.EventSystems.PointerEventData eventData) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Button.cs:45)
10. UnityEngine.EventSystems.ExecuteEvents.Execute (IPointerClickHandler handler, UnityEngine.EventSystems.BaseEventData eventData) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/EventSystem/ExecuteEvents.cs:50)
11. UnityEngine.EventSystems.ExecuteEvents.Execute[IPointerClickHandler] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.EventFunction`1 functor) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/EventSystem/ExecuteEvents.cs:261)
12. UnityEngine.EventSystems.EventSystem:Update()

 

Solved with B64R Encode