Open Stack

Hi,
I have a software that uses Openstack. When it do an action for the
first time, it need to get a token from Openstack. How it's possible
make a POST request like:

'{"auth":{"passwordCredentials":{"username": "joeuser", "password":
"secrete"}}}' -H "Content-type: application/json"
http://localhost:35357/v2.0/tokens

without pass the password in plaintext???

It's possible use PKI, ssl and so on?

Thanks
Emanuel