This module implements the HMAC algorithm as described by RFC 2104.
new(
key[, msg[, digestmod]])
Return a new hmac object. If msg is present, the method call
update(msg) is made. digestmod is the digest
constructor or module for the HMAC object to use. It defaults to
the hashlib.md5 constructor. Note:
The md5 hash
has known weaknesses but remains the default for backwards compatibility.
Choose a better one for your application.
An HMAC object has the following methods:
update(
msg)
Update the hmac object with the string 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).
digest(
)
Return the digest of the strings passed to the update()
method so far. This string will be the same length as the
digest_size of the digest given to the constructor. It
may contain non-ASCII characters, including NUL bytes.
hexdigest(
)
Like 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.
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.
