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# Copyright (c) 2002 Graham Barr <gbarr@pobox.com>. All rights reserved.
# This program is free software; you can redistribute it and/or
# modify it under the same terms as Perl itself.

package Authen::SASL::Perl::CRAM_MD5;

use strict;
use vars qw($VERSION @ISA);
use Digest::HMAC_MD5 qw(hmac_md5_hex);

$VERSION = "2.14";
@ISA	 = qw(Authen::SASL::Perl);

my %secflags = (
	noplaintext => 1,
	noanonymous => 1,
);

sub _order { 2 }
sub _secflags {
  shift;
  scalar grep { $secflags{$_} } @_;
}

sub mechanism { 'CRAM-MD5' }

sub client_start {
  '';
}

sub client_step {
  my ($self, $string) = @_;
  my ($user, $pass) = map {
    my $v = $self->_call($_);
    defined($v) ? $v : ''
  } qw(user pass);

$user . " " . hmac_md5_hex($string,$pass);
}

__END__

=head1 NAME

Authen::SASL::Perl::CRAM_MD5 - CRAM MD5 Authentication class

=head1 SYNOPSIS

use Authen::SASL qw(Perl);

$sasl = Authen::SASL->new(
    mechanism => 'CRAM-MD5',
    callback  => {
      user => $user,
      pass => $pass
    },
  );

=head1 DESCRIPTION

This method implements the client part of the CRAM-MD5 SASL algorithm,
as described in RFC 2195 resp. in IETF Draft draft-ietf-sasl-crammd5-XX.txt.

=head2 CALLBACK

The callbacks used are:

=over 4

=item user

The username to be used for authentication

=item pass

The user's password to be used for authentication

=back

=head1 SEE ALSO

L<Authen::SASL>,
L<Authen::SASL::Perl>

=head1 AUTHORS

Software written by Graham Barr <gbarr@pobox.com>,
documentation written by Peter Marschall <peter@adpm.de>.

Please report any bugs, or post any suggestions, to the perl-ldap mailing list
<perl-ldap@perl.org>

=head1 COPYRIGHT

=cut

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