This is Debian GNU/Linux's prepackaged version of Digest::SHA1
(renamed to be libdigest-sha1-perl).

The Digest::SHA1 module allows you to use the NIST SHA-1 message
digest algorithm from within Perl programs.  The algorithm takes as
input a message of arbitrary length and produces as output a 160-bit
"fingerprint" or "message digest" of the input.

SHA1 is described at <http://www.itl.nist.gov/fipspubs/fip180-1.htm>

This package was put together by Michael Alan Dorman <mdorman@debian.org>.
It is now maintained by Matthias Urlichs <smurf@debian.org>.

The original sources should always be available from the Comprehensive Perl
Archive Network (CPAN). Visit <URL:http://www.perl.com/CPAN/> to find a CPAN
site near you.

The only change for the Debian package was the addition of the debian/
files.

The Digest::SHA1 copright is as follows:

Copyright 1999-2001 Gisle Aas.
Copyright 1997 Uwe Hollerbach.

This library is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.

Perl is distributed under your choice of the GNU General Public License or
the Artistic License.  On Debian GNU/Linux systems, the complete text of the
GNU General Public License can be found in `/usr/share/common-licenses/GPL'
and the Artistic Licence in `/usr/share/common-licenses/Artistic'.