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53 lines
1.1 KiB
53 lines
1.1 KiB
#!/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_hex);
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sub module_constraints { [[0, 256], [-1, -1], [0, 55], [-1, -1], [-1, -1]] }
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sub module_generate_hash
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{
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my $word = shift;
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my $salt = shift;
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my $idx = shift;
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my $digest = md5_hex ($word);
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my $digest_half = substr ($digest, (defined $idx) ? $idx : 0, 16);
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my $hash = sprintf ("%s", $digest_half);
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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 $new_hash1 = module_generate_hash ($word_packed, undef, 0);
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my $new_hash2 = module_generate_hash ($word_packed, undef, 8);
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my $new_hash3 = module_generate_hash ($word_packed, undef, 16);
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return ($new_hash1, $word) if ($hash eq $new_hash1);
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return ($new_hash2, $word) if ($hash eq $new_hash2);
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return ($new_hash3, $word) if ($hash eq $new_hash3);
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return ("invalid", $word);
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}
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1;
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