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package Text::Password::Pronounceable;
use strict;
use warnings;
use Carp;
our $VERSION = '0.30';
# frequency of English digraphs (from D Edwards 1/27/66)
my $frequency = [
[
4, 20, 28, 52, 2, 11, 28, 4, 32, 4, 6, 62, 23, 167,
2, 14, 0, 83, 76, 127, 7, 25, 8, 1, 9, 1
], # aa - az
[
13, 0, 0, 0, 55, 0, 0, 0, 8, 2, 0, 22, 0, 0,
11, 0, 0, 15, 4, 2, 13, 0, 0, 0, 15, 0
], # ba - bz
[
32, 0, 7, 1, 69, 0, 0, 33, 17, 0, 10, 9, 1, 0,
50, 3, 0, 10, 0, 28, 11, 0, 0, 0, 3, 0
], # ca - cz
[
40, 16, 9, 5, 65, 18, 3, 9, 56, 0, 1, 4, 15, 6,
16, 4, 0, 21, 18, 53, 19, 5, 15, 0, 3, 0
], # da - dz
[
84, 20, 55, 125, 51, 40, 19, 16, 50, 1,
4, 55, 54, 146, 35, 37, 6, 191, 149, 65,
9, 26, 21, 12, 5, 0
], # ea - ez
[
19, 3, 5, 1, 19, 21, 1, 3, 30, 2, 0, 11, 1, 0,
51, 0, 0, 26, 8, 47, 6, 3, 3, 0, 2, 0
], # fa - fz
[
20, 4, 3, 2, 35, 1, 3, 15, 18, 0, 0, 5, 1, 4,
21, 1, 1, 20, 9, 21, 9, 0, 5, 0, 1, 0
], # ga - gz
[
101, 1, 3, 0, 270, 5, 1, 6, 57, 0, 0, 0, 3, 2,
44, 1, 0, 3, 10, 18, 6, 0, 5, 0, 3, 0
], # ha - hz
[
40, 7, 51, 23, 25, 9, 11, 3, 0, 0, 2, 38, 25, 202,
56, 12, 1, 46, 79, 117, 1, 22, 0, 4, 0, 3
], # ia - iz
[
3, 0, 0, 0, 5, 0, 0, 0, 1, 0, 0, 0, 0, 0,
4, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0
], # ja - jz
[
1, 0, 0, 0, 11, 0, 0, 0, 13, 0, 0, 0, 0, 2,
0, 0, 0, 0, 6, 2, 1, 0, 2, 0, 1, 0
], # ka - kz
[
44, 2, 5, 12, 62, 7, 5, 2, 42, 1, 1, 53, 2, 2,
25, 1, 1, 2, 16, 23, 9, 0, 1, 0, 33, 0
], # la - lz
[
52, 14, 1, 0, 64, 0, 0, 3, 37, 0, 0, 0, 7, 1,
17, 18, 1, 2, 12, 3, 8, 0, 1, 0, 2, 0
], # ma - mz
[
42, 10, 47, 122, 63, 19, 106, 12, 30, 1,
6, 6, 9, 7, 54, 7, 1, 7, 44, 124,
6, 1, 15, 0, 12, 0
], # na - nz
[
7, 12, 14, 17, 5, 95, 3, 5, 14, 0, 0, 19, 41, 134,
13, 23, 0, 91, 23, 42, 55, 16, 28, 0, 4, 1
], # oa - oz
[
19, 1, 0, 0, 37, 0, 0, 4, 8, 0, 0, 15, 1, 0,
27, 9, 0, 33, 14, 7, 6, 0, 0, 0, 0, 0
], # pa - pz
[
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 17, 0, 0, 0, 0, 0
], # qa - qz
[
83, 8, 16, 23, 169, 4, 8, 8, 77, 1, 10, 5, 26, 16,
60, 4, 0, 24, 37, 55, 6, 11, 4, 0, 28, 0
], # ra - rz
[
65, 9, 17, 9, 73, 13, 1, 47, 75, 3, 0, 7, 11, 12,
56, 17, 6, 9, 48, 116, 35, 1, 28, 0, 4, 0
], # sa - sz
[
57, 22, 3, 1, 76, 5, 2, 330, 126, 1,
0, 14, 10, 6, 79, 7, 0, 49, 50, 56,
21, 2, 27, 0, 24, 0
], # ta - tz
[
11, 5, 9, 6, 9, 1, 6, 0, 9, 0, 1, 19, 5, 31,
1, 15, 0, 47, 39, 31, 0, 3, 0, 0, 0, 0
], # ua - uz
[
7, 0, 0, 0, 72, 0, 0, 0, 28, 0, 0, 0, 0, 0,
5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0
], # va - vz
[
36, 1, 1, 0, 38, 0, 0, 33, 36, 0, 0, 4, 1, 8,
15, 0, 0, 0, 4, 2, 0, 0, 1, 0, 0, 0
], # wa - wz
[
1, 0, 2, 0, 0, 1, 0, 0, 3, 0, 0, 0, 0, 0,
1, 5, 0, 0, 0, 3, 0, 0, 1, 0, 0, 0
], # xa - xz
[
14, 5, 4, 2, 7, 12, 12, 6, 10, 0, 0, 3, 7, 5,
17, 3, 0, 4, 16, 30, 0, 0, 5, 0, 0, 0
], # ya - yz
[
1, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
]
]; # za - zz
# We need to know the totals for each row
my $row_sums = [
map {
my $sum = 0;
map { $sum += $_ } @$_;
$sum;
} @$frequency
];
# Frequency with which a given letter starts a word.
my $start_freq = [
1299, 425, 725, 271, 375, 470, 93, 223, 1009, 24,
20, 355, 379, 319, 823, 618, 21, 317, 962, 1991,
271, 104, 516, 6, 16, 14
];
my $total_sum = 0;
$total_sum += $_ for @$start_freq;
sub _check_lengths {
my ($min, $max) = @_;
Carp::carp "min length should be defined" unless defined $min;
Carp::carp "min length should be > 0" unless $min>0;
Carp::carp "max length should be defined" unless defined $max;
Carp::carp "max length should be > 0" unless $max>0;
Carp::carp "max length must be >= min length" unless $min<=$max;
}
sub new {
my $class = shift;
my ($min, $max) = @_;
$max ||= $min;
if (@_) {
_check_lengths($min, $max);
}
return bless { min => $min, max => $max }, $class;
}
sub generate {
my $self = shift;
my ($min, $max) = @_;
if (@_) {
$max ||= $min;
_check_lengths($min, $max);
} elsif (ref $self) { # if given no arguments,
# use the factory settings (if any)
$min = $self->{min};
$max = $self->{max};
}
if ( !$min && !$max ) {
# what? no parameters?
return q[]; # no random password
}
# When munging characters, we need to know where to start counting letters from
my $a = ord('a');
my $length = $min + int( rand( $max - $min ) );
my $char = $self->_generate_nextchar( $total_sum, $start_freq );
my @word = ( $char + $a );
for ( 2 .. $length ) {
$char =
$self->_generate_nextchar( $row_sums->[$char],
$frequency->[$char] );
push ( @word, $char + $a );
}
#Return the password
return pack( "C*", @word );
}
#A private helper function for RandomPassword
# Takes a row summary and a frequency chart for the next character to be searched
sub _generate_nextchar {
my $self = shift;
my ( $all, $freq ) = @_;
my ( $pos, $i );
for ( $pos = int( rand($all) ), $i = 0 ;
$pos >= $freq->[$i] ;
$pos -= $freq->[$i], $i++ )
{
}
return ($i);
}
1;
=head1 NAME
Text::Password::Pronounceable - Generate pronounceable passwords
=head1 SYNOPSIS
# Generate a pronounceable password that is between 6 and 10 characters.
Text::Password::Pronounceable->generate(6, 10);
# Ditto
my $pp = Text::Password::Pronounceable->new(6, 10);
$pp->generate;
=head1 DESCRIPTION
This module generates pronuceable passwords, based the the English
digraphs by D Edwards.
=head2 METHODS
=over
=item B<new>
$pp = Text::Password::Pronounceable->new($min, $max);
$pp = Text::Password::Pronounceable->new($len);
Construct a password factory with length limits of $min and $max.
Or create a password factory with fixed length if only one argument
is provided.
=item B<generate>
$pp->generate;
$pp->generate($len);
$pp->generate($min, $max);
Text::Password::Pronounceable->generate($len);
Text::Password::Pronounceable->generate($min, $max);
Generate password. If used as an instance method, arguments override
the factory settings.
=back
=head1 HISTORY
This code derived from mpw.pl, a bit of code with a sordid history.
=over 4
=item *
CPAN module by Chia-liang Kao 9/11/2006.
=item *
Perl cleaned up a bit by Jesse Vincent 1/14/2001.
=item *
Converted to perl from C by Marc Horowitz, 1/20/2000.
=item *
Converted to C from Multics PL/I by Bill Sommerfeld, 4/21/86.
=item *
Original PL/I version provided by Jerry Saltzer.
=back
=head1 LICENSE
Copyright 2006 by Best Practical Solutions, LLC.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
See <http://www.perl.com/perl/misc/Artistic.html>
=cut
|
