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-\section{\module{sha} ---
-         SHA-1 message digest algorithm}
-
-\declaremodule{builtin}{sha}
-\modulesynopsis{NIST's secure hash algorithm, SHA.}
-\sectionauthor{Fred L. Drake, Jr.}{fdrake@acm.org}
-
-\deprecated{2.5}{Use the \refmodule{hashlib} module instead.}
-
-
-This module implements the interface to NIST's\index{NIST} secure hash 
-algorithm,\index{Secure Hash Algorithm} known as SHA-1.  SHA-1 is an
-improved version of the original SHA hash algorithm.  It is used in
-the same way as the \refmodule{md5} module:\ use \function{new()}
-to create an sha object, then feed this object with arbitrary strings
-using the \method{update()} method, and at any point you can ask it
-for the \dfn{digest} of the concatenation of the strings fed to it
-so far.\index{checksum!SHA}  SHA-1 digests are 160 bits instead of
-MD5's 128 bits.
-
-
-\begin{funcdesc}{new}{\optional{string}}
-  Return a new sha object.  If \var{string} is present, the method
-  call \code{update(\var{string})} is made.
-\end{funcdesc}
-
-
-The following values are provided as constants in the module and as
-attributes of the sha objects returned by \function{new()}:
-
-\begin{datadesc}{blocksize}
-  Size of the blocks fed into the hash function; this is always
-  \code{1}.  This size is used to allow an arbitrary string to be
-  hashed.
-\end{datadesc}
-
-\begin{datadesc}{digest_size}
-  The size of the resulting digest in bytes.  This is always
-  \code{20}.
-\end{datadesc}
-
-
-An sha object has the same methods as md5 objects:
-
-\begin{methoddesc}[sha]{update}{arg}
-Update the sha object with the string \var{arg}.  Repeated calls are
-equivalent to a single call with the concatenation of all the
-arguments: \code{m.update(a); m.update(b)} is equivalent to
-\code{m.update(a+b)}.
-\end{methoddesc}
-
-\begin{methoddesc}[sha]{digest}{}
-Return the digest of the strings passed to the \method{update()}
-method so far.  This is a 20-byte string which may contain
-non-\ASCII{} characters, including null bytes.
-\end{methoddesc}
-
-\begin{methoddesc}[sha]{hexdigest}{}
-Like \method{digest()} except the digest is returned as a string of
-length 40, containing only hexadecimal digits.  This may 
-be used to exchange the value safely in email or other non-binary
-environments.
-\end{methoddesc}
-
-\begin{methoddesc}[sha]{copy}{}
-Return a copy (``clone'') of the sha object.  This can be used to
-efficiently compute the digests of strings that share a common initial
-substring.
-\end{methoddesc}
-
-\begin{seealso}
-  \seetitle[http://csrc.nist.gov/publications/fips/fips180-2/fips180-2withchangenotice.pdf]
-    {Secure Hash Standard}
-    {The Secure Hash Algorithm is defined by NIST document FIPS
-     PUB 180-2:
-     \citetitle[http://csrc.nist.gov/publications/fips/fips180-2/fips180-2withchangenotice.pdf]
-        {Secure Hash Standard}, published in August 2002.}
-
-  \seetitle[http://csrc.nist.gov/encryption/tkhash.html]
-           {Cryptographic Toolkit (Secure Hashing)}
-           {Links from NIST to various information on secure hashing.}
-\end{seealso}
-