Encrypting string based on X509 .cer in Python on Google App Engine

As the title says, I have the .cer file and I want to encrypt a stri开发者_Python百科ng. I've tried quite a few libs out there, w/o success. Does anyone have any experience with this?

I don't have an experience with this, but did you try Keyczar package by bundling it and trying to use that for your purposes. It has an Encrypter class for what you are trying to. It has a dependency on PyCrypto, but that seems already included in the GAE infrastructure.