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-package Digest::MD5;
-
-use strict;
-use vars qw($VERSION @ISA @EXPORT_OK);
-
-$VERSION = '2.39';
-
-require Exporter;
-*import = \&Exporter::import;
-@EXPORT_OK = qw(md5 md5_hex md5_base64);
-
-eval {
- require Digest::base;
- push(@ISA, 'Digest::base');
-};
-if ($@) {
- my $err = $@;
- *add_bits = sub { die $err };
-}
-
-
-eval {
- require XSLoader;
- XSLoader::load('Digest::MD5', $VERSION);
-};
-if ($@) {
- my $olderr = $@;
- eval {
- # Try to load the pure perl version
- require Digest::Perl::MD5;
-
- Digest::Perl::MD5->import(qw(md5 md5_hex md5_base64));
- push(@ISA, "Digest::Perl::MD5"); # make OO interface work
- };
- if ($@) {
- # restore the original error
- die $olderr;
- }
-}
-else {
- *reset = \&new;
-}
-
-1;
-__END__
-
-=head1 NAME
-
-Digest::MD5 - Perl interface to the MD5 Algorithm
-
-=head1 SYNOPSIS
-
- # Functional style
- use Digest::MD5 qw(md5 md5_hex md5_base64);
-
- $digest = md5($data);
- $digest = md5_hex($data);
- $digest = md5_base64($data);
-
- # OO style
- use Digest::MD5;
-
- $ctx = Digest::MD5->new;
-
- $ctx->add($data);
- $ctx->addfile(*FILE);
-
- $digest = $ctx->digest;
- $digest = $ctx->hexdigest;
- $digest = $ctx->b64digest;
-
-=head1 DESCRIPTION
-
-The C<Digest::MD5> module allows you to use the RSA Data Security
-Inc. MD5 Message Digest algorithm from within Perl programs. The
-algorithm takes as input a message of arbitrary length and produces as
-output a 128-bit "fingerprint" or "message digest" of the input.
-
-Note that the MD5 algorithm is not as strong as it used to be. It has
-since 2005 been easy to generate different messages that produce the
-same MD5 digest. It still seems hard to generate messages that
-produce a given digest, but it is probably wise to move to stronger
-algorithms for applications that depend on the digest to uniquely identify
-a message.
-
-The C<Digest::MD5> module provide a procedural interface for simple
-use, as well as an object oriented interface that can handle messages
-of arbitrary length and which can read files directly.
-
-=head1 FUNCTIONS
-
-The following functions are provided by the C<Digest::MD5> module.
-None of these functions are exported by default.
-
-=over 4
-
-=item md5($data,...)
-
-This function will concatenate all arguments, calculate the MD5 digest
-of this "message", and return it in binary form. The returned string
-will be 16 bytes long.
-
-The result of md5("a", "b", "c") will be exactly the same as the
-result of md5("abc").
-
-=item md5_hex($data,...)
-
-Same as md5(), but will return the digest in hexadecimal form. The
-length of the returned string will be 32 and it will only contain
-characters from this set: '0'..'9' and 'a'..'f'.
-
-=item md5_base64($data,...)
-
-Same as md5(), but will return the digest as a base64 encoded string.
-The length of the returned string will be 22 and it will only contain
-characters from this set: 'A'..'Z', 'a'..'z', '0'..'9', '+' and
-'/'.
-
-Note that the base64 encoded string returned is not padded to be a
-multiple of 4 bytes long. If you want interoperability with other
-base64 encoded md5 digests you might want to append the redundant
-string "==" to the result.
-
-=back
-
-=head1 METHODS
-
-The object oriented interface to C<Digest::MD5> is described in this
-section. After a C<Digest::MD5> object has been created, you will add
-data to it and finally ask for the digest in a suitable format. A
-single object can be used to calculate multiple digests.
-
-The following methods are provided:
-
-=over 4
-
-=item $md5 = Digest::MD5->new
-
-The constructor returns a new C<Digest::MD5> object which encapsulate
-the state of the MD5 message-digest algorithm.
-
-If called as an instance method (i.e. $md5->new) it will just reset the
-state the object to the state of a newly created object. No new
-object is created in this case.
-
-=item $md5->reset
-
-This is just an alias for $md5->new.
-
-=item $md5->clone
-
-This a copy of the $md5 object. It is useful when you do not want to
-destroy the digests state, but need an intermediate value of the
-digest, e.g. when calculating digests iteratively on a continuous data
-stream. Example:
-
- my $md5 = Digest::MD5->new;
- while (<>) {
- $md5->add($_);
- print "Line $.: ", $md5->clone->hexdigest, "\n";
- }
-
-=item $md5->add($data,...)
-
-The $data provided as argument are appended to the message we
-calculate the digest for. The return value is the $md5 object itself.
-
-All these lines will have the same effect on the state of the $md5
-object:
-
- $md5->add("a"); $md5->add("b"); $md5->add("c");
- $md5->add("a")->add("b")->add("c");
- $md5->add("a", "b", "c");
- $md5->add("abc");
-
-=item $md5->addfile($io_handle)
-
-The $io_handle will be read until EOF and its content appended to the
-message we calculate the digest for. The return value is the $md5
-object itself.
-
-The addfile() method will croak() if it fails reading data for some
-reason. If it croaks it is unpredictable what the state of the $md5
-object will be in. The addfile() method might have been able to read
-the file partially before it failed. It is probably wise to discard
-or reset the $md5 object if this occurs.
-
-In most cases you want to make sure that the $io_handle is in
-C<binmode> before you pass it as argument to the addfile() method.
-
-=item $md5->add_bits($data, $nbits)
-
-=item $md5->add_bits($bitstring)
-
-Since the MD5 algorithm is byte oriented you might only add bits as
-multiples of 8, so you probably want to just use add() instead. The
-add_bits() method is provided for compatibility with other digest
-implementations. See L<Digest> for description of the arguments
-that add_bits() take.
-
-=item $md5->digest
-
-Return the binary digest for the message. The returned string will be
-16 bytes long.
-
-Note that the C<digest> operation is effectively a destructive,
-read-once operation. Once it has been performed, the C<Digest::MD5>
-object is automatically C<reset> and can be used to calculate another
-digest value. Call $md5->clone->digest if you want to calculate the
-digest without resetting the digest state.
-
-=item $md5->hexdigest
-
-Same as $md5->digest, but will return the digest in hexadecimal
-form. The length of the returned string will be 32 and it will only
-contain characters from this set: '0'..'9' and 'a'..'f'.
-
-=item $md5->b64digest
-
-Same as $md5->digest, but will return the digest as a base64 encoded
-string. The length of the returned string will be 22 and it will only
-contain characters from this set: 'A'..'Z', 'a'..'z', '0'..'9', '+'
-and '/'.
-
-
-The base64 encoded string returned is not padded to be a multiple of 4
-bytes long. If you want interoperability with other base64 encoded
-md5 digests you might want to append the string "==" to the result.
-
-=back
-
-
-=head1 EXAMPLES
-
-The simplest way to use this library is to import the md5_hex()
-function (or one of its cousins):
-
- use Digest::MD5 qw(md5_hex);
- print "Digest is ", md5_hex("foobarbaz"), "\n";
-
-The above example would print out the message:
-
- Digest is 6df23dc03f9b54cc38a0fc1483df6e21
-
-The same checksum can also be calculated in OO style:
-
- use Digest::MD5;
-
- $md5 = Digest::MD5->new;
- $md5->add('foo', 'bar');
- $md5->add('baz');
- $digest = $md5->hexdigest;
-
- print "Digest is $digest\n";
-
-With OO style you can break the message arbitrary. This means that we
-are no longer limited to have space for the whole message in memory, i.e.
-we can handle messages of any size.
-
-This is useful when calculating checksum for files:
-
- use Digest::MD5;
-
- my $file = shift || "/etc/passwd";
- open(FILE, $file) or die "Can't open '$file': $!";
- binmode(FILE);
-
- $md5 = Digest::MD5->new;
- while (<FILE>) {
- $md5->add($_);
- }
- close(FILE);
- print $md5->b64digest, " $file\n";
-
-Or we can use the addfile method for more efficient reading of
-the file:
-
- use Digest::MD5;
-
- my $file = shift || "/etc/passwd";
- open(FILE, $file) or die "Can't open '$file': $!";
- binmode(FILE);
-
- print Digest::MD5->new->addfile(*FILE)->hexdigest, " $file\n";
-
-Perl 5.8 support Unicode characters in strings. Since the MD5
-algorithm is only defined for strings of bytes, it can not be used on
-strings that contains chars with ordinal number above 255. The MD5
-functions and methods will croak if you try to feed them such input
-data:
-
- use Digest::MD5 qw(md5_hex);
-
- my $str = "abc\x{300}";
- print md5_hex($str), "\n"; # croaks
- # Wide character in subroutine entry
-
-What you can do is calculate the MD5 checksum of the UTF-8
-representation of such strings. This is achieved by filtering the
-string through encode_utf8() function:
-
- use Digest::MD5 qw(md5_hex);
- use Encode qw(encode_utf8);
-
- my $str = "abc\x{300}";
- print md5_hex(encode_utf8($str)), "\n";
- # 8c2d46911f3f5a326455f0ed7a8ed3b3
-
-=head1 SEE ALSO
-
-L<Digest>,
-L<Digest::MD2>,
-L<Digest::SHA>,
-L<Digest::HMAC>
-
-L<md5sum(1)>
-
-RFC 1321
-
-http://en.wikipedia.org/wiki/MD5
-
-The paper "How to Break MD5 and Other Hash Functions" by Xiaoyun Wang
-and Hongbo Yu.
-
-=head1 COPYRIGHT
-
-This library is free software; you can redistribute it and/or
-modify it under the same terms as Perl itself.
-
- Copyright 1998-2003 Gisle Aas.
- Copyright 1995-1996 Neil Winton.
- Copyright 1991-1992 RSA Data Security, Inc.
-
-The MD5 algorithm is defined in RFC 1321. This implementation is
-derived from the reference C code in RFC 1321 which is covered by
-the following copyright statement:
-
-=over 4
-
-=item
-
-Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
-rights reserved.
-
-License to copy and use this software is granted provided that it
-is identified as the "RSA Data Security, Inc. MD5 Message-Digest
-Algorithm" in all material mentioning or referencing this software
-or this function.
-
-License is also granted to make and use derivative works provided
-that such works are identified as "derived from the RSA Data
-Security, Inc. MD5 Message-Digest Algorithm" in all material
-mentioning or referencing the derived work.
-
-RSA Data Security, Inc. makes no representations concerning either
-the merchantability of this software or the suitability of this
-software for any particular purpose. It is provided "as is"
-without express or implied warranty of any kind.
-
-These notices must be retained in any copies of any part of this
-documentation and/or software.
-
-=back
-
-This copyright does not prohibit distribution of any version of Perl
-containing this extension under the terms of the GNU or Artistic
-licenses.
-
-=head1 AUTHORS
-
-The original C<MD5> interface was written by Neil Winton
-(C<N.Winton@axion.bt.co.uk>).
-
-The C<Digest::MD5> module is written by Gisle Aas <gisle@ActiveState.com>.
-
-=cut