An HMAC object has the following methods:
-.. method:: hmac.update(msg)
+.. method:: HMAC.update(msg)
Update the hmac object with the bytes object *msg*. Repeated calls are
equivalent to a single call with the concatenation of all the arguments:
``m.update(a); m.update(b)`` is equivalent to ``m.update(a + b)``.
-.. method:: hmac.digest()
+.. method:: HMAC.digest()
Return the digest of the bytes passed to the :meth:`update` method so far.
This bytes object will be the same length as the *digest_size* of the digest
bytes.
-.. method:: hmac.hexdigest()
+.. method:: HMAC.hexdigest()
Like :meth:`digest` except the digest is returned as a string twice the
length containing only hexadecimal digits. This may be used to exchange the
value safely in email or other non-binary environments.
-.. method:: hmac.copy()
+.. method:: HMAC.copy()
Return a copy ("clone") of the hmac object. This can be used to efficiently
compute the digests of strings that share a common initial substring.