Klas Lindfors
95 lines
2.6 KiB
Perl
95 lines
2.6 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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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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#
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials provided
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# with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# This little perl program takes an input like:
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# S9999F9999F999999F0F1F0000000000300001E
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# and outputs that in hex, encoded in the 5-bit form described in
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# "Technical Implementation Guidance: Smart Card Enabled Physical Access
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# Control Systems"
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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 => "11010", # the examples and definitions of S and F differ
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F => "10110", # but we'll go with the examples here..
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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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