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package Integer::Tiny; |
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101795
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use utf8; |
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use strict; |
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use warnings; |
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use Math::BigInt; |
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use Carp; |
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our $VERSION = '0.3'; |
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sub new { |
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my ($class, $alphabet) = @_; |
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confess 'Missing key in constructor' unless defined $alphabet; |
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confess 'Key is too short' unless length $alphabet >= 2; |
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my $pos = 0; |
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my %chars_to_positions = map { $_ => $pos++ } split(//, $alphabet); |
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my %positions_to_chars = reverse %chars_to_positions; |
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my $length_of_alphabet = length $alphabet; |
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confess 'Key contains duplicate characters' |
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unless int keys %chars_to_positions == $length_of_alphabet; |
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my $self = { |
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'c2p' => \%chars_to_positions, |
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'p2c' => \%positions_to_chars, |
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'len' => $length_of_alphabet, |
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}; |
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return bless $self, $class; |
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} |
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sub encrypt { |
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my ($self, $value) = @_; |
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my $integer; |
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confess 'Value to encrypt not given' unless defined $value; |
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if (ref $value eq 'Math::BigInt') { |
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$integer = $value->copy(); |
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} |
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elsif ($value =~ m/^\d+$/) { |
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$integer = Math::BigInt->new($value); |
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} |
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else { |
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confess 'Value to encrypt is not an Integer or Math::BigInt object'; |
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} |
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my $encrypted = ''; |
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do { |
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321
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my $mod = $integer->copy(); |
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$mod->bmod($self->{'len'}); |
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$encrypted = $self->{'p2c'}->{$mod} . $encrypted; |
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$integer->bdiv($self->{'len'})->bfloor(); |
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} while ($integer->is_pos()); |
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return $encrypted; |
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} |
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sub decrypt { |
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my ($self, $encrypted) = @_; |
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confess 'Value encrypted not given' unless defined $encrypted; |
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confess 'Value encrypted is an empty string' unless length $encrypted; |
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my $pos = 0; |
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my $integer = Math::BigInt->new(0); |
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3122
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my @chars = reverse split //, $encrypted; |
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confess 'Value encrypted contains characters not present in key' if grep { !defined $self->{'c2p'}->{$_} } @chars; |
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for my $ch (@chars) { |
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my $to_add = Math::BigInt->new($self->{'len'}); |
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$to_add->bpow($pos++); |
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$to_add->bmul($self->{'c2p'}->{$ch}); |
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58484
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$integer->badd($to_add); |
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} |
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return $integer; |
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} |
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=head1 NAME |
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Integer::Tiny - Shorten and obfuscate your Integer values. Just like IDs on YouTube! |
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=head1 SYNOPSIS |
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use Integer::Tiny; |
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$it = Integer::Tiny->new('0WEMACKGVPHRQNST862UYZ3FL4X17O59DJIB'); |
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print $it->encrypt('12345678'); # prints 'GQZB2' |
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print $it->decrypt('GQZB2'); # prints '12345678' |
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Check USAGE section for more cool examples. |
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=head1 DESCRIPTION |
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Do you need fast and reliable method to obfuscate and shorten some Integer values? |
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Do you want to choose characters range you can use in output? |
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This module is for you! |
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108
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=head1 USAGE |
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Typical encrypt-and-shorten suitable for URL addresses. |
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my $key = 'hc2riK8fku7ezavCBJdMPwmntZ1s0yU4bOLI3SHRqANXFVD69gTG5oYQjExplW'; |
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my $it = Integer::Tiny->new($key); |
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print $it->encrypt('48888851145'); # om3R4e |
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Time to clone someone, convert Integer to DNA sequence :) |
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my $key = 'GCAT'; |
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my $it = Integer::Tiny->new($key); |
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print $it->encrypt('48888851145'); # ATCAGAGGGGAAAATGAC |
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And so on... You're limited only by your imagination when inventing keys. |
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This module is suitable for most Internet usage, |
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like preventing your webpages from being scanned by ID sequence |
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or hiding informations you do not like to show explicitly. |
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=head1 KEYS |
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Key must be a String of AT LEAST TWO UNIQUE CHARACTERS (utf8 is allowed). |
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Characters used in key will also be your output characters range, simple as that! |
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The longer the key the shorter output you get! |
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136
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Here is some code snippet to generate typical alphanumeric keys. |
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138
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use List::Util; |
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my @t = ('a' .. 'z', 'A' .. 'Z', 0 .. 9); |
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$key = join('', List::Util::shuffle @t ); |
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=head1 METHODS |
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=head3 new |
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146
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my $it = Integer::Tiny->new('qwerty'); |
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Create new object of C using key passed as the first parameter. |
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C will be called on missing or invalid key. |
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152
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=head3 encrypt |
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154
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print $it->encrypt('48888851145'); # rtetrwqyteytyr |
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156
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or |
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158
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my $i = Math::BigInt->new('48888851145'); |
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print $it->encrypt($i); # rtetrwqyteytyr |
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161
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Encrypt passed Integer value (bigint allowed) using key given in constructor. |
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163
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C will be called if value to encrypt is missing or not an Integer. |
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165
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WARNING: Do not use syntax shown below unless you are sure it fits in your machine integer size. |
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167
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print $it->encrypt(48888851145); # integer may overflow |
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169
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NOTE: Passed value is treated as Integer so leading C<0> (zero) chars are ignored! |
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171
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my $e = $it->encrypt('0048888851145'); |
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print $it->decrypt($e); # 48888851145 |
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174
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=head3 decrypt |
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print $it->decrypt('rtetrwqyteytyr'); # 48888851145 |
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Decrypt passed value using key given in constructor. |
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180
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C will be called if value to decrypt is missing |
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or contains characters not existing in key. |
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183
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=head1 PERL6 |
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185
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Yes, P6 Rakudo version is on the way |
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187
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=head1 AUTHOR |
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189
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Pawel (bbkr) Pabian |
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Private website: L (visit for contact data) |
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Company website: L |
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=head1 COPYRIGHT |
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197
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This program is free software; you can redistribute |
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it and/or modify it under the same terms as Perl itself. |
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200
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The full text of the license can be found in the |
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LICENSE file included with this module. |
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203
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=cut |
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205
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1; |