How to decode in python when encoded using CodeIgniter's encode?

Question

I store userNames, passwords and security-tokens using CodeIgniter's encode method like -

$this->load->library('encrypt');
//...
$password = $this->encrypt->encode($rows["password"]);
//Then save it in password column of user_credentials table.

Now, In python, I want to decode this encoded password. I have been trying to decode it with python's hashlib, but I am not able to.

I think it is because CI's encrypt library does more than md5 on the password-

function encode($string, $key = '')
{
    $key = $this->get_key($key);
    if ($this->_mcrypt_exists === TRUE)
    {
        $enc = $this->mcrypt_encode($string, $key);
    }
    else
    {
        $enc = $this->_xor_encode($string, $key);
    }
    return base64_encode($enc);
}

function decode($string, $key = '')
{
    $key = $this->get_key($key);

    if (preg_match('/[^a-zA-Z0-9\/\+=]/', $string))
    {
        return FALSE;
    }

    $dec = base64_decode($string);

    if ($this->_mcrypt_exists === TRUE)
    {
        if (($dec = $this->mcrypt_decode($dec, $key)) === FALSE)
        {
            return FALSE;
        }
    }
    else
    {
        $dec = $this->_xor_decode($dec, $key);
    }

    return $dec;
}

How should I decode it? I need to write above decode function in python. Please help.

nikkumang · Accepted Answer · 2013-02-26 06:32:46Z

1

Take a look at CI's system/libraries/Encrypt.php and check out how mcrypt_decode and _remove_cipher_noise work. There's a python interface to the mcrypt library available. Good hunting.

answered Feb 26, 2013 at 6:32

nikkumang

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6 Comments

Hussain Over a year ago

Hi, Installed this library from the link you gave me. When I do import mcrypt in python prompt it says the mcrypt module is not available. I am lost.

Hussain Over a year ago

Hi, I have started to write decode in python from decode of CI. What is python equivalent to CI's _xor_decode . Please help. I am about to call it done.

nikkumang Over a year ago

Check your PYTHONPATH to make sure Python can find the module. You may need to install libmcrypt as well. Here's some ports

nikkumang Over a year ago

BTW, from the CI docs: "The Encryption Class provides two-way data encryption. It uses a scheme that either compiles the message using a randomly hashed bitwise XOR encoding scheme, or is encrypted using the Mcrypt library. If Mcrypt is not available on your server the encoded message will still provide a reasonable degree of security for encrypted sessions or other such "light" purposes. If Mcrypt is available, you'll be provided with a high degree of security appropriate for storage." So best to go with mcrypt if you can

Hussain Over a year ago

Hi, $this->_mcrypt_exists = FALSE . So In python I only have to do the xor part. So I need a method equivalent to _xor_decode from php. I have written python decode method till this point and searching for xor. Do you know such method?

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