iOS Question Using B4XAES Lib

[Swissmade]

Hi all,
I use the nice B4XAES library in B4J and B4A.
In the post https://www.b4x.com/android/forum/t...ryption-decryption-b4xlib-b4a-b4i-b4j.141536/ it says that the lib can also be used in b4i.

Reason to use this is of the good Encryption and has to be compatible with B4A and B4I
I wondering how to use this because I can not see any example of how to use.

Thanks for helping me out here.

 

[Erel]

I'm not familiar with this library implementation but you can use (j)B4XEncryption, iEncryption. I think that the library you mentioned actually wraps these libraries.

[B4X] B4XEncryption

This library allows you to encrypt or decrypt data using the AES encryption method. It is simple to use and it is compatible with B4J jB4XEncryption library and B4i Encryption library (Encrypt and Decrypt method) which means that you can encrypt the data on one platform and decrypt it on a...

www.b4x.com

 

[Swissmade]

I'm not familiar with this library implementation but you can use (j)B4XEncryption, iEncryption. I think that the library you mentioned actually wraps these libraries.

[B4X] B4XEncryption

This library allows you to encrypt or decrypt data using the AES encryption method. It is simple to use and it is compatible with B4J jB4XEncryption library and B4i Encryption library (Encrypt and Decrypt method) which means that you can encrypt the data on one platform and decrypt it on a...

www.b4x.com

This I have try and the message from the Compiler I get are many errors.
But maybe B4XCipher has to go as Cipher and without B4XAES Library then the errors are gone.

Will test this and let you know the result.

Thanks for helping.

 

[Erel]

But maybe B4XCipher has to go as Cipher and without B4XAES Library then the errors are gone.

True. The code with (j)B4XEncryption and iEncryption will not be 100% identical, only 95% but the encryption is cross platform.
Simply use conditional compilation.

 

[Swissmade]

True. The code with (j)B4XEncryption and iEncryption will not be 100% identical, only 95% but the encryption is cross platform.
Simply use conditional compilation.

Ok will test.|

Thanks Erel

 

[Swissmade]

95% but the encryption is cross platform

I think I do something wrong or Apple Cipher is not really the same as B4Cipher.
It is not working Encrypt QR build with B4J can not be read by B4i.
In B4J and B4A I use jB4XEncryption and for B4i I use IEncryption

Public Sub SetAES1(Mess As String, Key As String, HaveToEncrypt As Boolean) As String
    Dim AesString As String
    Dim c As B4XCipher
    Dim b() As Byte
    Dim su As StringUtils
    Try
        If HaveToEncrypt = True Then
            b = c.Encrypt(Mess.GetBytes("utf8"), Key)
            AesString = su.EncodeBase64(b)
            Log(AesString)
        Else
            Dim enc() As Byte = su.DecodeBase64(Mess)
            b = c.Decrypt(enc, Key)
            AesString = BytesToString(b, 0, b.Length, "utf8")
        End If
    Catch
'        ShowLog("Error getting Password or Key", True, LastException.Message)
        AesString = "Wrong-Key"
    End Try
    Return AesString
End Sub

Public Sub SetAES1(Mess As String, Key As String, HaveToEncrypt As Boolean) As String
    Dim AesString As String
    Dim c As Cipher
    Dim b() As Byte
    Dim su As StringUtils
    Try
        If HaveToEncrypt = True Then
            b = c.Encrypt(Mess.GetBytes("utf8"), Key)
            AesString = su.EncodeBase64(b)
            Log(AesString)
        Else
            Dim enc() As Byte = su.DecodeBase64(Mess)
            b = c.Decrypt(enc, Key)
            AesString = BytesToString(b, 0, b.Length, "utf8")  <Crash here wrong Key
        End If
    Catch
'        ShowLog("Error getting Password or Key", True, LastException.Message)
        AesString = "Wrong-Key"
    End Try

    Return AesString
End Sub

 

[Swissmade]

QR Code to test
Text = This is a Encrypted QR Code
key = test Key

 

[Erel]

I've added a cross platform example: https://www.b4x.com/android/forum/threads/b4xencryption.48177/#content

You can use it to test the input and output.

 

[Swissmade]

Add B4XEncryption
Test that but now the error File Not Found

B4iProject/b4i_main.m:2:
/Users/administrator/Documents/UploadedProjects/<user id>/B4iProject/b4i_main.h:5:9: fatal error: 'B4XEncryption.h' file not found
#import "B4XEncryption.h"

 

[Erel]

You don't need to add anything.
Download the example project. Change the package name based on your provision profile and run it.

 

[Swissmade]

You don't need to add anything.
Download the example project. Change the package name based on your provision profile and run it.

Then I think the problem is, that I don't use B4XPages

 

[Erel]

I'm sorry but I cannot further help you here.
The example project runs as-is. You don't need to change anything. And the feature has nothing to do with B4XPages.

 

[Swissmade]

I'm sorry but I cannot further help you here.
The example project runs as-is. You don't need to change anything. And the feature has nothing to do with B4XPages.

Ok will test it
Thanks Erel

 

[Swissmade]

Hm I wondering.
All is working when I use the code generated with encrypt.
Put when I Scan the code as QR and read it back to Decrypt I get a other code.

Funny this . Is it possible that the scanner already do some Encryption?

 

[Swissmade]

Thanks Erel,
You have give me the direction to go and let me think.
I forgot in the scan part to remark the line

sb.Append("Detected code:").Append(CRLF)

This line is add to the scan result and I have not seen it in the first place.

Problem solved
Thanks again to let me search more.