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61 lines
1.2 KiB
Perl
61 lines
1.2 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::MD4 qw (md4 md4_hex);
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use Digest::MD5 qw (md5 md5_hex);
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use Text::Iconv;
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sub module_constraints { [[0, 256], [96, 96], [0, 27], [96, 96], [-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 $salt_bin = pack ("H*", $salt);
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my $converter = Text::Iconv->new('utf8', 'UTF-16LE');
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my $digest = md5_hex (md4 ($converter->convert ($word)) . $salt_bin);
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my $hash = sprintf ('$sntp-ms$%s$%s', $digest, unpack ("H*", $salt_bin));
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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 $idx = index ($line, ':');
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return unless $idx >= 0;
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my $hash = substr ($line, 0, $idx);
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my $word = substr ($line, $idx + 1);
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my (undef, $signature, $digest, $salt) = split '\$', $hash;
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return unless defined $signature;
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return unless defined $digest;
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return unless defined $salt;
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return unless $signature eq 'sntp-ms';
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return unless length $salt == 96;
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my $word_packed = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word_packed, $salt);
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return ($new_hash, $word);
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}
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1;
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