Translate java code to B4A: Mysql aes_encrypt() and aes_decrypt() compatible

[toby]

Requirements
1. aes_encrypt(): encrypted data can be decrypted using mysql's aes_decrypt() function
2. aes_decrypt(): It can decrypt data encrypted using mysql's aes_encrypt() function.
3. Initialization vector not used.
4. The two functions should produce same results as corresponding mysql functions.

Below are some sample data:

SELECT aes_encrypt('abc', '123'), aes_decrypt(aes_encrypt('abc', '123'), '123');
result: 0x911ff5b9a15aae9b52e7e9fde75315b1, abc

If you're interested, please send me a private message with your asking price. I'll pay for the source code via paypal.

More detail: details

Solution in Java is here. All you need to do is to convert the code to B4A.

 

[Quandalle]

attached is a module that does AES encryption/decryption for MySQL encrypted keys

    Dim cipher As MySqlAES
    cipher.Initialize
    
    Log(cipher.Encrypt("abc", "123"))
    Log(cipher.Decrypt(cipher.Encrypt("abc","123"),"123"))

Ouput is

911ff5b9a15aae9b52e7e9fde75315b1
abc

 

[toby]

attached is a module that does AES encryption/decryption for MySQL encrypted keys

    Dim cipher As MySqlAES
    cipher.Initialize
   
    Log(cipher.Encrypt("abc", "123"))
    Log(cipher.Decrypt(cipher.Encrypt("abc","123"),"123"))

Ouput is

911ff5b9a15aae9b52e7e9fde75315b1
abc

Quandalle,

Thank you very much for the code!!

I copied and pasted the encrypted data to run a mysql query and it returned Null. I notice that the mysql encrypted data has "0x" prefix, so I tried it as well and both return Null. Could you kindly take a look to see what I was missing?

SELECT aes_decrypt('0x911ff5b9a15aae9b52e7e9fde75315b1', '123')
     , aes_decrypt(  '911ff5b9a15aae9b52e7e9fde75315b1', '123');
    
Output: Null, Null

 

[toby]

My solution is to first save the encrypted data to a mysql table column of VarBinary(50) data type, then query the table as follows

SELECT *, aes_decrypt(test, '123') as  test_decrypted
FROM `tests` WHERE 1;

 

[toby]

@Quandalle,

Your code works finally now! Thank you very much for sharing the code! I appreciate it indeed. How do I send you some coffee money?

 

[Quandalle]

@toby

SELECT aes_decrypt('0x911ff5b9a15aae9b52e7e9fde75315b1', '123')
     , aes_decrypt(  '911ff5b9a15aae9b52e7e9fde75315b1', '123');
 
Output: Null, Null

This execution which gives "Null" is normal because aes_encrypt returns a binary string (and aes_decrypt uses the binary string as a parameter).
It is probably just a display option in your MySQL environment that makes the display in hexadecimal and not in binary form

Also to decode a string written in hexdecimal you have to complete with a call to UNHEX which will transform the hexadecimal string into a binary string

SELECT aes_decrypt(UNHEX('911ff5b9a15aae9b52e7e9fde75315b1'),'123');