Python function to generate wsse headers

wsse.py

# See for WSSE key generation this link:
# https://oroinc.com/orocrm/doc/2.0/cookbook/how-to-use-wsse-authentication
# Returns a dictionary of headers
def genheaders(user_name, user_key):
    random = str(uuid.uuid4()).encode('ascii')
    nonce = hashlib.md5(random).digest()[0:16]
    curdate = datetime.datetime.now().replace(microsecond=0)

    hash_digest = hashlib.sha1()
    hash_digest.update(nonce)
    hash_digest.update(curdate.isoformat().encode('ascii'))
    hash_digest.update(user_key)

    x_wsse =  ', '.join([  'UsernameToken Username="{user}"',
                           'PasswordDigest="{digest}"',
                           'Nonce="{nonce}"',
                           'Created="{created}"'])
    x_wsse = x_wsse.format(
                        user=user_name,
                        digest=base64.b64encode(hash_digest.digest()).decode('utf-8'),
                        nonce=base64.b64encode(nonce).decode('utf-8'),
                        created=curdate.isoformat(),
                    )

    return { 
            'Authorization': 'WSSE profile="UsernameToken"',
            'X-WSSE': x_wsse,
           }