PyCrypto Errors with .p12 file from Google Developer Console

I am trying to implement Google Identity Toolkit (gitkitv3) in GAE Python. After a user signs in on the website, I get the following errors:

'PKCS12 format is not supported by the PyCrpto library. '
NotImplementedError: PKCS12 format is not supported by the PyCrpto library. Try converting to a "PEM" (openssl pkcs12 -in xxxxx.p12 -nodes -nocerts > privatekey.pem) or using PyOpenSSL if native code is an option.

Based on a SO reply, I ran the following commands on my x.p12 file and used the generated privatekey.pem file instead:

openssl pkcs12 -passin pass:notasecret -in x.p12 -nocerts -passout pass:notasecret -out key.pem 
openssl pkcs8 -nocrypt -in key.pem -passin pass:notasecret -topk8 -out privatekey.pem

Now, I am getting the following error:

'X509 certs are not supported by the PyCrypto library. '
NotImplementedError: X509 certs are not supported by the PyCrypto library. Try using PyOpenSSL if native code is an option.

I had downloaded the x.p12 from Google Developer Console. How to fix this error? Please help

ANY WORKAROUND?

Do I necessarily need this file .p12 file or can I copy its contents to a global variable and use it (as a workaround)? Could someone please explain me the actual use of this file?

UPDATE
Looks like PyCrypto library provided by Google is extremely limited and lacks capability to support X509.

Sushil

Installing pyopenssl fixed the issue for me: