Question

I want to override/extend Mage_Core_Encryption_Model to handle Legacy Passwords.

I’m migrating old sites data into magento. My old site encryption method is Sha-1. but magento use md5 + text in core encryption method. I have changed the core module manually and migrate correctly but now i want to create a custom module for that (migrate without encryption, after migration override the md5 method by sha-1)

How can I create a custom module for that that overwrites the core code I have changed?

Answer 1

If I understand correctly, you need a module to replace the md5 hash mechanism in Magento with sha1?

I wont go into creating an entire module here, but simply the key parts. If you are interested though as a complete example to reference, I created a module a while back which replaces the md5 hash with sha512 that you can look at – https://github.com/drewhunter/BetterHash – you would obviously need to slightly modify it to handle sha1)

So essentially you need to override the hash() method of Mage_Core_Model_Encryption

Your modules config.xml will require the following:

File: app/code/local/Yourcompany/Yourmodule/etc/config.xml

<?xml version="1.0"?>

<config>
    <modules>
        <Yourcompany_Yourmodule>
            <version>1.0.0</version>
        </Yourcompany_Yourmodule>
    </modules>
    <global>
        <helpers>
            <core>
                <encryption_model>Yourcompany_Yourmodule_Model_Hash</encryption_model>
            </core>  
        </helpers>
    </global>
</config>

Then to take advantage of the rewrite:

File: app/code/local/Yourcompany/Yourmodule/Model/Hash.php

<?php

class Yourcompany_Yourmodule_Model_Hash extends Mage_Core_Model_Encryption
{
    public function hash($data)
    {
        return sha1($data);
    }
}