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56 lines
984 B
56 lines
984 B
#!/usr/bin/env perl
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##
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## Author......: See docs/credits.txt
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## License.....: MIT
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##
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use strict;
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use warnings;
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use Digest::MD5 qw (md5);
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sub module_constraints { [[-1, -1], [-1, -1], [0, 55], [-1, -1], [-1, -1]] }
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my $itoa62 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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sub module_generate_hash
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{
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my $word = shift;
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my $digest = md5 ($word);
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my @chksum;
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for (my $i = 0, my $j = 0; $i < 16; $i += 2, $j += 1)
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{
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$chksum[$j] = (ord (substr ($digest, $i + 0, 1)) + ord (substr ($digest, $i + 1, 1))) % 62;
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$chksum[$j] = substr ($itoa62, $chksum[$j], 1);
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}
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my $res = join "", @chksum;
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my $hash = sprintf ("%s", $res);
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return $hash;
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}
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sub module_verify_hash
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{
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my $line = shift;
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my ($hash, $word) = split (':', $line);
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return unless defined $hash;
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return unless defined $word;
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my $word_packed = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word_packed);
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return ($new_hash, $word);
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}
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1;
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