Klas Lindfors
100 lines
2.4 KiB
Perl
100 lines
2.4 KiB
Perl
#!/usr/bin/perl
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# Copyright (c) 2014 Yubico AB
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# All rights reserved.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Additional permission under GNU GPL version 3 section 7
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#
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# If you modify this program, or any covered work, by linking or
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# combining it with the OpenSSL project's OpenSSL library (or a
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# modified version of that library), containing parts covered by the
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# terms of the OpenSSL or SSLeay licenses, We grant you additional
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# permission to convey the resulting work. Corresponding Source for a
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# non-source form of such a combination shall include the source code
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# for the parts of OpenSSL used as well as that of the covered work.
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use strict;
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use Bit::Vector;
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my %encoding = (
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0 => "00001",
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1 => "10000",
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2 => "00100",
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3 => "00111",
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4 => "01000",
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5 => "01011",
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6 => "01101",
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7 => "01110",
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8 => "10000",
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9 => "10011",
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S => "10110",
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F => "11010",
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E => "11111",
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);
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my $in = shift;
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my @ones = (0, 0, 0, 0);
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my $bits;
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foreach my $char (split(//, $in)) {
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my $enc = $encoding{$char};
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for(my $i = 0; $i < 4; $i++) {
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my $char = substr($enc, $i, 1);
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if($char eq '1') {
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$ones[$i]++;
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}
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}
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$bits .= $enc;
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}
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my $lrc = "";
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my $lrc_one = 0;
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foreach my $one (@ones) {
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if($one % 2 == 0) {
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$lrc .= '0';
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} else {
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$lrc .= '1';
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$lrc_one++;
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}
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}
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if($lrc_one % 2 == 0) {
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$lrc .= '1';
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} else {
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$lrc .= '0';
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}
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$bits .= $lrc;
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my $vector = Bit::Vector->new(200);
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$vector->from_Bin($bits);
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my $hex = $vector->to_Hex();
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for(my $i = 0; $i < length($hex); $i += 2) {
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print "0x" . substr($hex, $i , 2) . ", ";
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}
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print "\n";
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__END__
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for(my $i = 0; $i < length($in); $i += 8) {
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my $part = substr($in, $i, $i + 8);
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my $bits = "0b";
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foreach my $char (split(//, $part)) {
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$bits .= $encoding{$char};
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}
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my $num = eval($bits);
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warn $num;
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}
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