AES 128 cipher method problem for decrypt in PHP

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#1

Hi everyone!

I’m using Kodular to encrypt data with AES-128, and I need to decrypt these data in php.

I’ve been looking for the cipher method used in Kodular, and I found this answer: What method is used in AES-128 encryption (Cryptography component) - #4 by laravel59

Unfortunately, the solution provided is not working for me. I encrypted data in Kodular and tried to decrypt them in PHP using the above method, but the procedure was not working.
I decided to try the inverse process and tried to encrypt the same string in PHP and Kodular separately, to find out if the problem was somewhere else or in the method, but it looks like it is actually the method.
I write my code below.

PHP side:
$aes128 = openssl_encrypt(“php is cool”, “AES-128-ECB”,“123456789”);

Output on web from the PHP page: iCvfjXEi2RbCpRJj7dbK4g==

Android side:

blocks
blocks733×116 11.5 KB

Output in the app:
2

If the method was the same, the two operations should produce the same output, but as you can see they’re not. Anyone can help with this? Is there a way to see the cipher method used within the block “cryptography” available in Kodular?
Thank you!

Bcrypt problem using cryptography if server runs on php version 7
#2

Maybe this might help

1 Like
#3

Hi dora_paz thanks for the answer (sorry, can’t mention you directly).
Unfortunately I had already read this (if you see, the code I used in my example was inspired by the answers of Yashsehgal022) but it’s not working.
I really don’t understand why :sob:

#4

Guys is really so hard to get an answer? Isn’t it possible to ask to the coders who implemented the system? They should know the method used!
Thanks

#5

Well, the answer is explained in detail above. :point_up:

If yours isn’t working, you should explain why it isn’t working.:thinking:

Syntax error? Logic error? Error in PHP ( here is Kodular community , better search in Google )
:+1:

1 Like
#6

Hi @Rogerio_Rios, thanks for the answer.
I would exclude error in PHP (I work with PHP coders who code since 1995 and they ensured me the code is ok), moreover I do get an output in PHP, so if the code was wrong I would get an error.

My blocks are here:

blocks
blocks733×116 11.5 KB

The point is that I can’t see (or decide) the cipher method in Kodular, and there’s no reference to the one used in the blocks, so how do I know which one to use to decrypt the data outside the app?

I’m sorry I can’t provide an answer, I would share a solution if I had it, but I don’t and that’s why I’m asking for help!

#7

Did you try with another the cipher methods ( aes-128-??? ?) ?

#8

@Rogerio_Rios yes, I did try with all the cipher methods below:
aes-128-ecb
aes-128-cbc
aes-128-cbc-hmac-sha1
aes-128-cbc-hmac-sha256
aes-128-ccm
aes-128-cfb
aes-128-cfb1
aes-128-cfb8
aes-128-ctr
aes-128-gcm
aes-128-ocb
aes-128-ofb
aes-128-xts

None of them gave the correct output (by the way sorry for not saying it before!)

1 Like
#9

So it seems to be a bug in aes-128 block
:point_down:

1 Like
#10

my aes extension uses AES 128, CBC and PKCS5 padding.
Also there exists a php server method by Stefan to decrypt and encrypt using the same algorithm, for details see here App Inventor Extensions: AES Encrypt/Decrypt | Pura Vida Apps

Taifun

#11

I also checked and realized that the built-in Kodular AES-128 encryption is not decrypted on the Web server using PHP. In search of a solution, I came across a discussion where I was able to find a solution to this problem.
The “AES encryption free extension” and the PHP script work the same way in both the Kodular application and the PHP Web server.

Link to the extension branch: https://community.kodular.io/t/aes-encryption-free-extension/744

cryptoExtension
cryptoExtension1010×774 82.5 KB

1 Like
#12