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Diff for /palm/Palm-Keyring/lib/Palm/Keyring.pm between version 1.7 and 1.24

version 1.7, 2006/11/10 16:45:42 version 1.24, 2007/02/03 00:52:43
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 # Palm::Keyring.pm  package Palm::Keyring;
   
   # $RedRiver: Keyring.pm,v 1.23 2007/02/02 01:51:46 andrew Exp $
 #  #
 # Perl class for dealing with Keyring for Palm OS databases.  # Perl class for dealing with Keyring for Palm OS databases.
 #  #
 #       Copyright (C) 2004, Andrew Fresh  
 #       You may distribute this file under the terms of the Artistic  
 #       License, as specified in the README file distributed with the p5-Palm distribution.  
 #  
 #   This started as Memo.pm, I just made it work for Keyring.  #   This started as Memo.pm, I just made it work for Keyring.
 #  
 # $Id$  
 # $RedRiver: Keyring.pm,v 1.6 2006/11/10 16:18:59 andrew Exp $  
   
 use strict;  use strict;
 package Palm::Keyring;  use warnings;
 use Palm::Raw();  use Carp;
 use Palm::StdAppInfo();  
 use vars qw( $VERSION @ISA );  
   
   use base qw/ Palm::StdAppInfo /;
   
 use Digest::MD5 qw(md5);  use Digest::MD5 qw(md5);
 use Crypt::DES;  use Crypt::DES;
   
 use constant ENCRYPT    =>  1;  my $ENCRYPT    = 1;
 use constant DECRYPT    =>  0;  my $DECRYPT    = 0;
 use constant MD5_CBLOCK => 64;  my $MD5_CBLOCK = 64;
 my $kSaltSize = 4;  my $kSalt_Size = 4;
   my $EMPTY      = q{};
   my $SPACE      = q{ };
   my $NULL       = chr 0;
   
   our $VERSION = 0.93;
   
 # One liner, to allow MakeMaker to work.  sub new {
 $VERSION = do { my @r = (q$Revision$ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r };      my $classname = shift;
       my $pass      = shift;
   
 @ISA = qw( Palm::StdAppInfo Palm::Raw );      # Create a generic PDB. No need to rebless it, though.
       my $self = $classname->SUPER::new(@_);
   
 =head1 NAME      $self->{'name'}    = 'Keys-Gtkr';    # Default
       $self->{'creator'} = 'Gtkr';
       $self->{'type'}    = 'Gkyr';
   
 Palm::Keyring - Handler for Palm Keyring databases.      # The PDB is not a resource database by
       # default, but it's worth emphasizing,
       # since MemoDB is explicitly not a PRC.
       $self->{'attributes'}{'resource'} = 0;
   
 =head1 SYNOPSIS      # Initialize the AppInfo block
       $self->{'appinfo'} = {};
   
     use Palm::Keyring;      # Add the standard AppInfo block stuff
         $pdb->Decrypt('mypassword');      Palm::StdAppInfo::seed_StdAppInfo( $self->{'appinfo'} );
   
 =head1 DESCRIPTION      # Set the version
       $self->{'version'} = 4;
   
 The Keyring PDB handler is a helper class for the Palm::PDB package. It      if ( defined $pass ) {
 parses Keyring databases.  See          $self->Password($pass);
 L<http://gnukeyring.sourceforge.net/>.      }
   
 It is just the standard Palm::Raw with 2 additional public methods.  Decrypt and Encrypt.      return $self;
   }
   
 =cut  sub import {
 =head2 new      Palm::PDB::RegisterPDBHandlers( __PACKAGE__, [ 'Gtkr', 'Gkyr' ], );
       return 1;
   }
   
   $pdb = new Palm::Keyring ('password');  sub ParseRecord {
       my $self     = shift;
   
 Create a new PDB, initialized with the various Palm::Keyring fields      my $rec = $self->SUPER::ParseRecord(@_);
 and an empty record list.  
   
 Use this method if you're creating a Keyring PDB from scratch.      # skip the 0 record that holds the password
       return $rec if ! exists $self->{'records'};
       return $rec if ! exists $rec->{'data'};
   
 =cut      my ( $name, $encrypted ) = split /$NULL/xm, $rec->{'data'}, 2;
 #'  
 sub new  
 {  
         my $classname   = shift;  
         my $pass = shift;  
   
         # Create a generic PDB. No need to rebless it, though.      return $rec if ! $encrypted;
         my $self        = $classname->SUPER::new(@_);      delete $rec->{'data'};
       $rec->{'name'} = $name;
       $rec->{'encrypted'} = $encrypted;
   
         $self->{name} = "Keys-Gtkr";    # Default      return $rec;
         $self->{creator} = "Gtkr";  }
         $self->{type} = "Gkyr";  
         # The PDB is not a resource database by  
         # default, but it's worth emphasizing,  
         # since MemoDB is explicitly not a PRC.  
         $self->{attributes}{resource} = 0;  
   
         # Initialize the AppInfo block  sub PackRecord {
         $self->{appinfo} = {};      my $self = shift;
       my $rec  = shift;
   
         # Add the standard AppInfo block stuff      if ($rec->{'encrypted'}) {
         &Palm::StdAppInfo::seed_StdAppInfo($self->{appinfo});          if (! defined $rec->{'name'}) {
               $rec->{'name'} = $EMPTY;
           }
           $rec->{'data'} = join $NULL, $rec->{'name'}, $rec->{'encrypted'};
           delete $rec->{'name'};
           delete $rec->{'encrypted'};
       }
   
         # Set the version      return $self->SUPER::PackRecord($rec, @_);
         $self->{version} = 4;  }
   
         # Give the PDB the first record that will hold the encrypted password  sub Encrypt {
         $self->{records} = [ {      my $self = shift;
                 'category'   => 0,      my $rec  = shift;
                 'attributes' => {      my $data = shift;
                         'private' => 1,      my $pass = shift || $self->{'password'};
                         'Secret'  => 1,  
                         'Dirty'   => 1,  
                         'dirty'   => 1,  
                 },  
         }, ];  
   
         if ($pass) {      if ( ! $pass) {
                 $self->Encrypt($pass);          croak("'password' not set!\n");
         }      }
   
         return $self;      if ( ! $rec) {
 }          croak("Needed parameter 'record' not passed!\n");
       }
   
 sub import      if ( ! $data) {
 {          croak("Needed parameter 'data' not passed!\n");
         &Palm::PDB::RegisterPDBHandlers(__PACKAGE__,      }
                 [ "Gtkr", "Gkyr" ],  
                 );  
 }  
   
 sub Load      if ( ! $self->Password($pass)) {
 {          croak("Incorrect Password!\n");
         my $self = shift;      }
         $self->SUPER::Load(@_);  
   
         foreach my $record (@{ $self->{records} }) {      $self->{'digest'}   ||= _calc_keys( $pass );
                 next unless exists $record->{data};  
                 my ($name, $encrypted) = split /\000/, $record->{data}, 2;  
                 next unless $encrypted;  
                 $record->{plaintext}->{name} = $name;  
         $record->{encrypted} = $encrypted;  
         }  
         1;  
 }  
   
 sub Write      $data->{'account'}  ||= $EMPTY;
 {      $data->{'password'} ||= $EMPTY;
         my $self = shift;      $data->{'notes'}    ||= $EMPTY;
         $self->Encrypt() || return undef;  
         return $self->SUPER::Load(@_);  
 }  
   
 sub Encrypt      my $changed      = 0;
 {      my $need_newdate = 0;
         my $self = shift;      my $acct = {};
         my $pass = shift;      if ($rec->{'encrypted'}) {
           $acct = $self->Decrypt($rec, $pass);
           foreach my $key (keys %{ $data }) {
               next if $key eq 'lastchange';
               if ($data->{$key} ne $acct->{$key}) {
                   $changed = 1;
                   last;
               }
           }
           if ( exists $data->{'lastchange'} && exists $acct->{'lastchange'} && (
               $data->{'lastchange'}->{day}   != $acct->{'lastchange'}->{day}   ||
               $data->{'lastchange'}->{month} != $acct->{'lastchange'}->{month} ||
               $data->{'lastchange'}->{year}  != $acct->{'lastchange'}->{year}
           )) {
               $changed = 1;
               $need_newdate = 0;
           } else {
               $need_newdate = 1;
           }
   
       } else {
           $changed = 1;
       }
   
         if ($pass) {      # no need to re-encrypt if it has not changed.
                 unless ($self->_keyring_verify($pass) ) {      return 1 if ! $changed;
                         # This would encrypt with a new password.  
                         # First decrypting everything with the old password of course.  
                         $self->_keyring_update($pass) || return undef;  
                         $self->_keyring_verify($pass) || return undef;  
                 }  
         }  
   
         $self->{digest} ||= _calc_keys($self->{password});      my ($day, $month, $year);
   
         foreach my $record (@{ $self->{records} }) {      if ($data->{'lastchange'} && ! $need_newdate ) {
                 next unless defined $record->{plaintext};          $day   = $data->{'lastchange'}->{'day'}   || 1;
           $month = $data->{'lastchange'}->{'month'} || 0;
           $year  = $data->{'lastchange'}->{'year'}  || 0;
   
                 my $name        = defined $record->{plaintext}->{name}        ?          # XXX Need to actually validate the above information somehow
                         $record->{plaintext}->{name}        : '';          if ($year >= 1900) {
                 my $account     = defined $record->{plaintext}->{account}     ?              $year -= 1900;
                         $record->{plaintext}->{account}     : '';          }
                 my $password    = defined $record->{plaintext}->{password}    ?      } else {
                         $record->{plaintext}->{password}    : '';          $need_newdate = 1;
                 my $description = defined $record->{plaintext}->{description} ?      }
                         $record->{plaintext}->{description} : '';  
                 my $extra       = '';  
   
                 my $plaintext = join("\000", $account, $password, $description, $extra);      if ($need_newdate) {
           ($day, $month, $year) = (localtime)[3,4,5];
       }
       $year -= 4;
       $month++;
   
                 my $encrypted = _crypt3des($plaintext, $self->{digest}, ENCRYPT);  
   
                 $record->{data} = join("\000", $name, $encrypted);      my $p = $day | ($month << 5) | ($year << 9);
         }      my $packeddate = pack 'n', $p;
   
         return 1;      my $plaintext = join $NULL,
           $data->{'account'}, $data->{'password'}, $data->{'notes'}, $packeddate;
   
       my $encrypted = _crypt3des( $plaintext, $self->{'digest'}, $ENCRYPT );
   
       return if ! $encrypted;
   
       $rec->{'attributes'}{'Dirty'} = 1;
       $rec->{'attributes'}{'dirty'} = 1;
       $rec->{'name'}    ||= $data->{'name'};
       $rec->{'encrypted'} = $encrypted;
   
       return 1;
 }  }
   
 sub Decrypt  sub Decrypt {
 {      my $self = shift;
         my $self = shift;      my $rec  = shift;
         my $pass = shift;      my $pass = shift || $self->{'password'};
   
         if ($pass) {      if ( ! $pass) {
                 $self->_keyring_verify($pass) || return undef;          croak("'password' not set!\n");
         }      }
   
         $self->{digest} ||= _calc_keys($self->{password});      if ( ! $rec) {
           croak("Needed parameter 'record' not passed!\n");
       }
   
         foreach my $record (@{ $self->{records} }) {      if ( ! $self->Password($pass)) {
                 next unless defined $record->{data};          croak("Invalid Password!\n");
       }
   
                 my ($name, $encrypted) = split /\000/, $record->{data}, 2;      if ( ! $rec->{'encrypted'} ) {
                 next unless $encrypted;          croak("No encrypted content!");
       }
   
                 $record->{plaintext}->{name} = $name;      $self->{'digest'} ||= _calc_keys( $pass );
   
                 my $decrypted = _crypt3des($encrypted, $self->{digest}, DECRYPT);      my $decrypted =
                 my ($account, $password, $description, $extra)          _crypt3des( $rec->{'encrypted'}, $self->{'digest'}, $DECRYPT );
                       = split /\000/, $decrypted, 4;      my ( $account, $password, $notes, $packeddate ) = split /$NULL/xm,
             $decrypted, 4;
   
                 $record->{plaintext}->{account}     = defined $account     ?      my %Modified;
                         $account     : '';      if ($packeddate) {
                 $record->{plaintext}->{password}    = defined $password    ?          my $u = unpack 'n', $packeddate;
                         $password    : '';          my $year  = (($u & 0xFE00) >> 9) + 4; # since 1900
                 $record->{plaintext}->{description} = defined $description ?          my $month = (($u & 0x01E0) >> 5) - 1; # 0-11
                         $description : '';          my $day   = (($u & 0x001F) >> 0);     # 1-31
   
                 #print "Name:      '$name'\n";          %Modified = (
                 #print "Encrypted: '$encrypted' - Length: " . length($encrypted) . "\n";              year   => $year,
                 #print "    Hex:   '" . unpack("H*", $encrypted) . "'\n";              month  => $month || 0,
                 #print "    Binary:'" . unpack("b*", $encrypted) . "'\n";              day    => $day   || 1,
                 #print "Decrypted: '$decrypted' - Length: " . length($decrypted) . "\n";          );
                 #print "    Hex:   '" . unpack("H*", $decrypted) . "'\n";      }
                 #print "    Binary:'" . unpack("b*", $decrypted) . "'\n";  
                 #print "\n";  
                 #print "Extra: $extra\n";  
                 #exit;  
                 #--------------------------------------------------  
                 # print "Account:     $account\n";  
                 # print "Password:    $password\n";  
                 # print "Description: $description\n";  
                 #--------------------------------------------------  
   
         }      return {
           name       => $rec->{'name'},
           account    => $account,
           password   => $password,
           notes      => $notes,
           lastchange => \%Modified,
       };
   }
   
   sub Password {
       my $self = shift;
       my $pass = shift;
       my $new_pass = shift;
   
       if (! $pass) {
           delete $self->{password};
         return 1;          return 1;
       }
   
       if (! exists $self->{'records'}) {
           # Give the PDB the first record that will hold the encrypted password
           $self->{'records'} = [ $self->new_Record ];
   
           return $self->_password_update($pass);
       }
   
       if ($new_pass) {
           my @accts = ();
           foreach my $i (0..$#{ $self->{'records'} }) {
               if ($i == 0) {
                   push @accts, undef;
                   next;
               }
               my $acct = $self->Decrypt($self->{'records'}->[$i], $pass);
               if ( ! $acct ) {
                   croak("Couldn't decrypt $self->{'records'}->[$i]->{'name'}");
               }
               push @accts, $acct;
           }
   
           if ( ! $self->_password_update($new_pass)) {
               croak("Couldn't set new password!");
           }
           $pass = $new_pass;
   
           foreach my $i (0..$#accts) {
               next if $i == 0;
               delete $self->{'records'}->[$i]->{'encrypted'};
               $self->Encrypt($self->{'records'}->[$i], $accts[$i], $pass);
           }
       }
   
       return $self->_password_verify($pass);
 }  }
   
 sub _calc_keys  sub _calc_keys {
 {      my $pass = shift;
         my $pass = shift;      if (! defined $pass) { croak('No password defined!'); };
         die "No password defined!" unless defined $pass;  
   
         my $digest = md5($pass);      my $digest = md5($pass);
   
         my ($key1, $key2) = unpack('a8a8', $digest);      my ( $key1, $key2 ) = unpack 'a8a8', $digest;
         #--------------------------------------------------  
         # print "key1: $key1: ", length $key1, "\n";  
         # print "key2: $key2: ", length $key2, "\n";  
         #--------------------------------------------------  
   
         $digest = unpack('H*', $key1 . $key2 . $key1);      #--------------------------------------------------
         #--------------------------------------------------      # print "key1: $key1: ", length $key1, "\n";
         # print "Digest: ", $digest, "\n";      # print "key2: $key2: ", length $key2, "\n";
         # print length $digest, "\n";      #--------------------------------------------------
         #--------------------------------------------------  
   
         return $digest;      $digest = unpack 'H*', $key1 . $key2 . $key1;
   
       #--------------------------------------------------
       # print "Digest: ", $digest, "\n";
       # print length $digest, "\n";
       #--------------------------------------------------
   
       return $digest;
 }  }
   
 sub _keyring_verify  sub _password_verify {
 {      my $self = shift;
         my $self = shift;      my $pass = shift;
         my $pass = shift;  
   
         die "No password specified!" unless $pass;      if (! $pass) { croak('No password specified!'); };
         $self->{password} = $pass;  
   
         # AFAIK the thing we use to test the password is      if (defined $self->{'password'} && $pass eq $self->{'password'}) {
         #     always in the first entry          # already verified this password
         my $data = $self->{records}->[1]->{data};          return 1;
         #die "No encrypted password in file!" unless defined $data;      }
         return undef unless defined $data;  
   
         $data =~ s/\0$//;      # AFAIK the thing we use to test the password is
       #     always in the first entry
       my $data = $self->{'records'}->[0]->{'data'};
   
         my $salt = substr($data, 0, $kSaltSize);      #die "No encrypted password in file!" unless defined $data;
       if ( ! defined $data) { return; };
   
         my $msg = $salt . $pass;      $data =~ s/$NULL$//xm;
   
         $msg .= "\0" x (MD5_CBLOCK - length($msg));      my $salt = substr $data, 0, $kSalt_Size;
   
         my $digest = md5($msg);      my $msg = $salt . $pass;
   
         if ($data eq $salt . $digest) {      $msg .= "\0" x ( $MD5_CBLOCK - length $msg );
                 # May as well generate the keys we need now, since we know the password is right  
                 $self->{digest} = _calc_keys($self->{password});      my $digest = md5($msg);
                 if ($self->{digest}) {  
                         return 1;      if ( $data eq $salt . $digest ) {
                 } else {  
                         return undef;  # May as well generate the keys we need now, since we know the password is right
                 }          $self->{'digest'} = _calc_keys($pass);
         } else {          if ( $self->{'digest'} ) {
                 return undef;              $self->{'password'} = $pass;
         }              return 1;
           }
       }
       return;
 }  }
   
 sub _keyring_update  sub _password_update {
 {  
         # It is very important to Encrypt after calling this  
         #     (Although it is generally only called by Encrypt)  
         # because otherwise the data will be out of sync with the  
         # password, and that would suck!  
         my $self = shift;  
         my $pass = shift;  
   
         die "No password specified!" unless $pass;      # It is very important to Encrypt after calling this
       #     (Although it is generally only called by Encrypt)
       # because otherwise the data will be out of sync with the
       # password, and that would suck!
       my $self = shift;
       my $pass = shift;
   
         # if the database already has a password in it      if (! defined $pass) { croak('No password specified!'); };
         if ($self->{records}->[1]->{data}) {  
                 # Make sure everything is decrypted before we update the keyring  
                 $self->Decrypt() || return undef;  
         }  
   
         my $salt;      my $salt;
         for (1..$kSaltSize) {      for ( 1 .. $kSalt_Size ) {
                 $salt .= chr(int(rand(255)));          $salt .= chr int rand 255;
         }      }
   
         my $msg = $salt . $pass;      my $msg = $salt . $pass;
   
         $msg .= "\0" x (MD5_CBLOCK - length($msg));      $msg .= "\0" x ( $MD5_CBLOCK - length $msg );
   
         my $digest = md5($msg);      my $digest = md5($msg);
   
         my $data = $salt . $digest;# . "\0";      my $data = $salt . $digest;    # . "\0";
   
         # AFAIK the thing we use to test the password is      # AFAIK the thing we use to test the password is
         #     always in the first entry      #     always in the first entry
         $self->{records}->[1]->{data} = $data;      $self->{'records'}->[0]->{'data'} = $data;
   
         $self->{password} = $pass;      $self->{'password'} = $pass;
         $self->{digest}   = _calc_keys($self->{password});      $self->{'digest'}   = _calc_keys( $self->{'password'} );
   
         return 1;      return 1;
 }  }
   
   sub _crypt3des {
       my ( $plaintext, $passphrase, $flag ) = @_;
   
 # XXX Have to make this encrypt as well as decrypting, but w00 h00!      $passphrase   .= $SPACE x ( 16 * 3 );
 # do null padding on the end of a cleartext if we are going to encrypt it      my $cyphertext = $EMPTY;
 sub _crypt3des {  
         my ( $plaintext, $passphrase, $flag ) = @_;  
   
         $passphrase .= ' ' x (16*3);      my $size = length $plaintext;
         my $cyphertext = "";  
   
       #print "STRING: '$plaintext' - Length: " . (length $plaintext) . "\n";
   
         my $size = length ( $plaintext );      my @C;
         #print "STRING: '$plaintext' - Length: " . length($plaintext) . "\n";      for ( 0 .. 2 ) {
           $C[$_] =
             new Crypt::DES( pack 'H*', ( substr $passphrase, 16 * $_, 16 ));
       }
   
         # This check should see if it is plaintext first, if it is,      for ( 0 .. ( ($size) / 8 ) ) {
         #   pad it with \000          my $pt = substr $plaintext, $_ * 8, 8;
         # if not, then die  
         die "record not 8 byte padded" if (length($plaintext) % 8) && ! $flag;  
   
         my @C;          #print "PT: '$pt' - Length: " . length($pt) . "\n";
         for ( 0..2 ) {          if (! length $pt) { next; };
                 $C[$_] = new Crypt::DES( pack( "H*", substr($passphrase, 16*$_, 16 )));          if ( (length $pt) < 8 ) {
         }              if ($flag == $DECRYPT) { croak('record not 8 byte padded'); };
               my $len = 8 - (length $pt);
   
         for ( 0 .. (($size)/8) - 1) {              #print "LENGTH: $len\n";
                 my $pt = substr( $plaintext, $_*8, 8 );              #print "Binary:    '" . unpack("b*", $pt) . "'\n";
                 #print "PT: '$pt' - Length: " . length($pt) . "\n";              $pt .= ($NULL x $len);
                 if (length($pt) < 8) {  
                         my $len = 8 - length($pt);  
                         print "LENGTH: $len\n";  
                         print "Binary:    '" . unpack("b*", $pt) . "'\n";  
                         $pt .= (chr(0) x $len);# . $pt;  
                         print "Binary:    '" . unpack("b*", $pt) . "'\n";  
                         #print "PT: '$pt' - Length: " . length($pt) . "\n";  
                 }  
                 $pt = $C[0]->decrypt( $pt );  
                 $pt = $C[1]->encrypt( $pt );  
                 $pt = $C[2]->decrypt( $pt );  
                 #print "PT: '$pt' - Length: " . length($pt) . "\n";  
                 $cyphertext .= $pt;  
         }  
   
         return substr ( $cyphertext, 0, $size );              #print "PT: '$pt' - Length: " . length($pt) . "\n";
               #print "Binary:    '" . unpack("b*", $pt) . "'\n";
           }
           if ( $flag == $ENCRYPT ) {
               $pt = $C[0]->encrypt($pt);
               $pt = $C[1]->decrypt($pt);
               $pt = $C[2]->encrypt($pt);
           }
           else {
               $pt = $C[0]->decrypt($pt);
               $pt = $C[1]->encrypt($pt);
               $pt = $C[2]->decrypt($pt);
           }
   
           #print "PT: '$pt' - Length: " . length($pt) . "\n";
           $cyphertext .= $pt;
       }
   
       $cyphertext =~ s/$NULL+$//xm;
   
       #print "CT: '$cyphertext' - Length: " . length($cyphertext) . "\n";
   
       return $cyphertext;
 }  }
   
 1;  1;
 __END__  __END__
   
   =head1 NAME
   
   Palm::Keyring - Handler for Palm Keyring databases.
   
   =head1 DESCRIPTION
   
   The Keyring PDB handler is a helper class for the Palm::PDB package. It
   parses Keyring for Palm OS databases.  See
   L<http://gnukeyring.sourceforge.net/>.
   
   It has the standard Palm::PDB methods with 2 additional public methods.
   Decrypt and Encrypt.
   
   It currently supports the v4 Keyring databases.  The v5 databases from
   the pre-release keyring-2.0 are not supported.
   
   This module doesn't store the decrypted content.  It only keeps it until it
   returns it to you or encrypts it.
   
   =head1 SYNOPSIS
   
       use Palm::PDB;
       use Palm::Keyring;
   
       my $pass = 'password';
       my $file = 'Keys-Gtkr.pdb';
       my $pdb  = new Palm::PDB;
       $pdb->Load($file);
   
       foreach (0..$#{ $pdb->{'records'} }) {
           next if $_ = 0; # skip the password record
           my $rec  = $pdb->{'records'}->[$_];
           my $acct = $pdb->Decrypt($rec, $pass);
           print $rec->{'name'}, ' - ', $acct->{'account'}, "\n";
       }
   
   =head1 SUBROUTINES/METHODS
   
   =head2 new
   
       $pdb = new Palm::Keyring([$password]);
   
   Create a new PDB, initialized with the various Palm::Keyring fields
   and an empty record list.
   
   Use this method if you're creating a Keyring PDB from scratch otherwise you
   can just use Palm::PDB::new() before calling Load().
   
   If you pass in a password, it will initalize the first record with the encrypted
   password.
   
   =head2 Encrypt
   
       $pdb->Encrypt($rec, $acct[, $password]);
   
   Encrypts an account into a record, either with the password previously
   used, or with a password that is passed.
   
   $rec is a record from $pdb->{'records'} or a new_Record().
   $acct is a hashref in the format below.
   
       my $acct = {
           name       => $rec->{'name'},
           account    => $account,
           password   => $password,
           notes      => $notes,
           lastchange => {
               year  => 107, # years since 1900
               month =>   0, # 0-11, 0 = January, 11 = December
               day   =>  30, # 1-31, same as localtime
           },
       };
   
   If you have changed anything other than the lastchange, or don't pass in a
   lastchange key, Encrypt() will generate a new lastchange date for you.
   
   If you pass in a lastchange field that is different than the one in the
   record, it will honor what you passed in.
   
   Encrypt() only uses the $acct->{'name'} if there is not already a $rec->{'name'}.
   
   =head2 Decrypt
   
       my $acct = $pdb->Decrypt($rec[, $password]);
   
   Decrypts the record and returns a hashref for the account as described
   under Encrypt().
   
       foreach (0..$#{ $pdb->{'records'}) {
           next if $_ == 0;
           my $rec = $pdb->{'records'}->[$_];
           my $acct = $pdb->Decrypt($rec[, $password]);
           # do something with $acct
       }
   
   =head2 Password
   
       $pdb->Password([$password[, $new_password]]);
   
   Either sets the password to be used to crypt, or if you pass $new_password,
   changes the password on the database.
   
   If you have created a new $pdb, and you didn't set a password when you
   called new(), you only need to pass one password and it will set that as
   the password.
   
   If nothing is passed, it forgets the password that it was remembering.
   
   =head1 DEPENDENCIES
   
   Palm::StdAppInfo
   
   Digest::MD5
   
   Crypt::DES
   
   Readonly
   
   =head1 THANKS
   
   I would like to thank the helpful Perlmonk shigetsu who gave me some great advice
   and helped me get my first module posted.  L<http://perlmonks.org/?node_id=596998>
   
   I would also like to thank
   Johan Vromans
   E<lt>jvromans@squirrel.nlE<gt> --
   L<http://www.squirrel.nl/people/jvromans>.
   He had his own Palm::KeyRing module that he posted a couple of days before
   mine was ready and he was kind enough to let me have the namespace as well
   as giving me some very helpful hints about doing a few things that I was
   unsure of.  He is really great.
   
   =head1 BUGS AND LIMITATIONS
   
   Please report any bugs or feature requests to
   C<bug-palm-keyring at rt.cpan.org>, or through the web interface at
   L<http://rt.cpan.org>.  I will be notified, and then you'll automatically be
   notified of progress on your bug as I make changes.
   
 =head1 AUTHOR  =head1 AUTHOR
   
 Andrew Fresh E<lt>andrew@mad-techies.org<gt>  Andrew Fresh E<lt>andrew@mad-techies.orgE<gt>
   
   =head1 LICENSE AND COPYRIGHT
   
   Copyright 2004, 2005, 2006, 2007 Andrew Fresh, All Rights Reserved.
   
   This program is free software; you can redistribute it and/or
   modify it under the same terms as Perl itself.
   
 =head1 SEE ALSO  =head1 SEE ALSO
   
 Palm::PDB(3)  Palm::PDB(3)
   
 Palm::StdAppInfo(3)  Palm::StdAppInfo(3)
   
 =cut  The Keyring for Palm OS website:
   L<http://gnukeyring.sourceforge.net/>
   
   Johan Vromans also has a wxkeyring app that now uses this module, available
   from his website at L<http://www.vromans.org/johan/software/sw_wxkeyring.html>
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