How to use RSA-SHA256 in python using private key

[prakash sharma]

Hi all,

I am stuck while salesforce jwt-bearer auth.

I need help in this code section:

String key='xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx';

Blob privateKey = EncodingUtil.base64Decode(key);

String signature = System.encodingUtil.base64Encode(

    Crypto.sign('RSA-SHA256', Blob.valueOf(jwtRequest), privateKey)).replace('+', '-').replace('/', '_');

I have tried python code but this is not working

import hmac,hashlib

from base64 import b64encode, b64decode 

res = hmac.new(input_key,message, digestmod=hashlib.sha256).hexdigest()

Please help