hmac_base64.py

#!/usr/bin/env python

# this is from The Python
# Standard Library by example
# ISBN13: 9780321767349

import base64
import hmac
import hashlib

with open('lorem.txt', 'rb') as f:
    body = f.read()

hash = hmac.new('secret-key', body, hashlib.sha1)
digest = hash.digest()
print base64.encodestring(digest)