Oracle Forms

Hello All,
I need to create a POC to do:
1)user open an html page .
2)the page has a form that take username/password.
3)upon form submit a JavaScript run that encrypts the password and redirects the user to a form deployed to a certain server with static address and append the username/encrypted password to it.
4)in the forms on the login page I use an on-logon trigger to extract username/password decrypt the password then login to the database.

my question is it possible to hash the password - seeing as hashing is one way , there is no way to get the original password- and configure the forms the login with the hashed password instead?

thanks in advance.