Change my admin password in codeigniter (i forgot it)

Hi i have a website that was made in codeigniter but i have problem to access to backend because i forgot the password. I need that create new password for me using my encryption_key

I preffer only give you the encryption_key and that you generate me a password for me or give you my encryption_key and the actual encrypted password for help me to decrypt it.

Remember the password are for codeigniter. Thank you!