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Manpages MD5Section: User Contributed Perl Documentation (3)Updated: perl v5.6.0 Index Return to Main Contents NAMEDigest::MD5 - Perl interface to the MD5 AlgorithmSYNOPSIS# 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; DESCRIPTIONThe `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.The `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. A binary digest will be 16 bytes long. A hex digest will be 32 characters long. A base64 digest will be 22 characters long. FUNCTIONSThe following functions can be exported from the `Digest::MD5' module. No functions are exported by default.
METHODSThe following methods are available:
EXAMPLESThe 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 6df23dc03f9b54cc38a0fc1483df6e21provided that the implementation is working correctly. 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 builtin 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"; SEE ALSOthe Digest manpage, the Digest::MD2 manpage, the Digest::SHA1 manpage, the Digest::HMAC manpagemd5sum(1) COPYRIGHTThis library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
Copyright 1998-2000 Gisle Aas. Copyright 1995-1996 Neil Winton. Copyright 1991-1992 RSA Data Security, Inc.The MD5 algorithm is defined in RFC 1321. The basic C code implementing the algorithm is derived from that in the RFC and is covered by the following copyright:
This copyright does not prohibit distribution of any version of Perl containing this extension under the terms of the GNU or Artistic licenses. AUTHORSThe original MD5 interface was written by Neil Winton (`N.Winton@axion.bt.co.uk').This release was made by Gisle Aas <gisle@ActiveState.com>
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