62 lines
1.9 KiB
TeX
62 lines
1.9 KiB
TeX
\section{Built-in module \sectcode{md5}}
|
|
\bimodindex{md5}
|
|
|
|
This module implements the interface to RSA's MD5 message digest
|
|
algorithm (see also the file \file{md5.doc}). Its use is quite
|
|
straightforward: use the function \code{md5} to create an
|
|
\dfn{md5}-object. You can now ``feed'' this object with arbitrary
|
|
strings.
|
|
|
|
At any time you can ask for the ``final'' digest of the object. Internally,
|
|
a temporary copy of the object is made and the digest is computed and
|
|
returned. Because of the copy, the digest operation is not destructive
|
|
for the object. Before a more exact description of the module's use, a small
|
|
example will be helpful:
|
|
to obtain the digest of the string \code{'abc'}, use \ldots
|
|
|
|
\bcode\begin{verbatim}
|
|
>>> import md5
|
|
>>> m = md5.new()
|
|
>>> m.update('abc')
|
|
>>> m.digest()
|
|
'\220\001P\230<\322O\260\326\226?}(\341\177r'
|
|
\end{verbatim}\ecode
|
|
|
|
More condensed:
|
|
|
|
\bcode\begin{verbatim}
|
|
>>> md5.new('abc').digest()
|
|
'\220\001P\230<\322O\260\326\226?}(\341\177r'
|
|
\end{verbatim}\ecode
|
|
|
|
\renewcommand{\indexsubitem}{(in module md5)}
|
|
|
|
\begin{funcdesc}{new}{\optional{arg}}
|
|
Create a new md5-object. If \var{arg} is present, an initial
|
|
\code{update} method is called with \var{arg} as argument.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{md5}{\optional{arg}}
|
|
For backward compatibility reasons, this is an alternative name for the
|
|
\code{new} function.
|
|
\end{funcdesc}
|
|
|
|
An md5-object has the following methods:
|
|
|
|
\renewcommand{\indexsubitem}{(md5 method)}
|
|
\begin{funcdesc}{update}{arg}
|
|
Update this md5-object with the string \var{arg}.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{digest}{}
|
|
% XXX The following is not quite clear; what does MD5Final do?
|
|
Return the \dfn{digest} of this md5-object. Internally, a copy is made
|
|
and the \C-function \code{MD5Final} is called. Finally the digest is
|
|
returned.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{copy}{}
|
|
Return a separate copy of this md5-object. An \code{update} to this
|
|
copy won't affect the original object.
|
|
\end{funcdesc}
|