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83 lines
1.7 KiB
Perl
83 lines
1.7 KiB
Perl
#!/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 { [[0, 232], [0, 232], [0, 32], [0, 32], [0, 32]] }
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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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# we need to reduce the maximum password and salt buffer size by 23 since we
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# add it here statically
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my $final = sprintf ("%s:Administration Tools:%s", $salt, $word);
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my $hash_buf = md5 ($final);
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my $res = "";
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for (my $pos = 0; $pos < 16; $pos += 2)
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{
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my $octet1 = ord (substr ($hash_buf, $pos + 0, 1));
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my $octet2 = ord (substr ($hash_buf, $pos + 1, 1));
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my $num = (($octet1 << 8) & 0xff00)
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| (($octet2 << 0) & 0x00ff);
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my $idx1 = $num >> 12 & 0x0f;
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my $idx2 = $num >> 6 & 0x3f;
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my $idx3 = $num & 0x3f;
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my $itoa64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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$res = $res . substr ($itoa64, $idx1, 1) . substr ($itoa64, $idx2, 1) . substr ($itoa64, $idx3, 1);
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}
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my $obfuscate_str = "nrcstn";
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my @obfuscate_pos = (0, 6, 12, 17, 23, 29);
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foreach my $pos (keys @obfuscate_pos)
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{
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my $idx = $obfuscate_pos[$pos];
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my $before = substr ($res, 0, $idx);
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my $char = substr ($obfuscate_str, $pos, 1);
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my $after = substr ($res, $idx);
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$res = sprintf ("%s%s%s", $before, $char, $after);
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}
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my $hash = sprintf ("%s:%s", $res, $salt);
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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, $salt, $word) = split (':', $line);
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return unless defined $hash;
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return unless defined $salt;
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return unless defined $word;
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$word = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word, $salt);
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return ($new_hash, $word);
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}
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1;
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