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package Steemit::Base58; |
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use Modern::Perl; |
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=head1 NAME |
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Steemit::Base58 - perl library for base58 encoding the bitcoin way |
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=head1 SYNOPSIS |
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use Steemit::Base58 |
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my $binary = Steemit::Base58::decode_base58( $base58_string ) |
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my $base58 = Steemit::Base58::encode_base58( $binary ) |
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=cut |
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use Math::BigInt try => 'GMP,Pari'; |
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use Carp; |
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# except 0 O D / 1 l I |
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my $chars = [qw( |
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1 2 3 4 5 6 7 8 9 |
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A B C D E F G H J |
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K L M N P Q R S T |
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U V W X Y Z |
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a b c d e f g h i |
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j k m n o p q r s |
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t u v w x y z |
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)]; |
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my $test = qr/^[@{[ join "", @$chars ]}]+$/; |
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my $map = do { |
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my $i = 0; |
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+{ map { $_ => $i++ } @$chars }; |
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}; |
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sub encode_base58 { |
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my ($binary) = @_; |
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return $chars->[0] unless $binary; |
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my $bigint = Math::BigInt->from_bytes($binary); |
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my $base58 = ''; |
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my $base = @$chars; |
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while ($bigint->is_pos) { |
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my ($quotient, $rest ) = $bigint->bdiv($base); |
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$base58 = $chars->[$rest] . $base58; |
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} |
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return $base58; |
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} |
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sub decode_base58 { |
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my $base58 = shift; |
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$base58 =~ tr/0OlI/DD11/; |
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$base58 =~ $test or croak "Invalid Base58"; |
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my $decoded = Math::BigInt->new(0); |
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my $multi = Math::BigInt->new(1); |
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my $base = @$chars; |
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while (length $base58 > 0) { |
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my $digit = chop $base58; |
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$decoded->badd($multi->copy->bmul($map->{$digit})); |
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$multi->bmul($base); |
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} |
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return $decoded->to_bytes; |
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} |
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1; |
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=head1 REPOSITORY |
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L |
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=head1 AUTHOR |
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snkoehn, C<< >> |
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=head1 BUGS |
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Please report any bugs or feature requests to C, or through |
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the web interface at L. I will be notified, and then you'll |
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automatically be notified of progress on your bug as I make changes. |
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=head1 SUPPORT |
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You can find documentation for this module with the perldoc command. |
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perldoc Steemit::WsClient |
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You can also look for information at: |
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=over 4 |
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=item * RT: CPAN's request tracker (report bugs here) |
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=item * AnnoCPAN: Annotated CPAN documentation |
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=item * CPAN Ratings |
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=item * Search CPAN |
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=back |
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=head1 ACKNOWLEDGEMENTS |
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=head1 LICENSE AND COPYRIGHT |
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Copyright 2018 snkoehn. |
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This program is free software; you can redistribute it and/or modify it |
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under the terms of the the Artistic License (2.0). You may obtain a |
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copy of the full license at: |
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Any use, modification, and distribution of the Standard or Modified |
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Versions is governed by this Artistic License. By using, modifying or |
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distributing the Package, you accept this license. Do not use, modify, |
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or distribute the Package, if you do not accept this license. |
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If your Modified Version has been derived from a Modified Version made |
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by someone other than you, you are nevertheless required to ensure that |
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your Modified Version complies with the requirements of this license. |
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This license does not grant you the right to use any trademark, service |
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mark, tradename, or logo of the Copyright Holder. |
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This license includes the non-exclusive, worldwide, free-of-charge |
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patent license to make, have made, use, offer to sell, sell, import and |
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otherwise transfer the Package with respect to any patent claims |
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licensable by the Copyright Holder that are necessarily infringed by the |
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Package. If you institute patent litigation (including a cross-claim or |
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counterclaim) against any party alleging that the Package constitutes |
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direct or contributory patent infringement, then this Artistic License |
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to you shall terminate on the date that such litigation is filed. |
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Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDER |
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AND CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES. |
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THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR |
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PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED TO THE EXTENT PERMITTED BY |
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YOUR LOCAL LAW. UNLESS REQUIRED BY LAW, NO COPYRIGHT HOLDER OR |
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CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, OR |
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CONSEQUENTIAL DAMAGES ARISING IN ANY WAY OUT OF THE USE OF THE PACKAGE, |
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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=cut |
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