====== HMAC ======
  * [[https://en.wikipedia.org/wiki/Hash-based_message_authentication_code|HMAC Hash based message authentication]]

===== Python example =====
<code python>
from hashlib import sha256
from hmac import HMAC
from base64 import b64encode
 
# encode message with HMAC_SHA1
hm = HMAC('secretKey', 'message', sha256)

# to hexdigit
hmac_auth = hm.hexdigest()
 
# or to base64 string
hmac_auth = b64encode(hm.digest())
</code>