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91 lines
2.1 KiB
Perl
91 lines
2.1 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 Authen::Passphrase::NTHash;
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use Digest::HMAC qw (hmac hmac_hex);
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use Digest::MD5 qw (md5);
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use Encode qw (encode);
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sub module_constraints { [[0, 127], [0, 55], [0, 27], [0, 27], [-1, -1]] } # room for improvement in pure kernel mode
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sub module_generate_hash
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{
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my $word = shift;
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my $user = shift;
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my $user_len = length $user;
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my $domain_len = 27 - $user_len;
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my $domain = shift // random_string ($domain_len);
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my $srv_ch = shift // random_hex_string (2 * 8);
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my $cli_ch = shift // random_client_challenge ();
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my $b_srv_ch = pack ('H*', $srv_ch);
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my $b_cli_ch = pack ('H*', $cli_ch);
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my $nthash = Authen::Passphrase::NTHash->new (passphrase => $word)->hash;
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my $identity = encode ('UTF-16LE', uc ($user) . $domain);
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my $digest = hmac_hex ($b_srv_ch . $b_cli_ch, hmac ($identity, $nthash, \&md5, 64), \&md5, 64);
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my $hash = sprintf ("%s::%s:%s:%s:%s", $user, $domain, $srv_ch, $digest, $cli_ch);
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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 $user;
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my $domain;
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my $srv_ch;
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my $cli_ch;
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my $word;
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my $hash;
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my $index1 = index ($line, '::');
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my $index2 = index ($line, ':', $index1 + 2);
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my $index3 = index ($line, ':', $index2 + 3 + 16 + 32);
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return if $index1 eq -1;
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return if $index2 eq -1;
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return if $index3 eq -1;
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$hash = substr ($line, 0, $index3);
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$user = substr ($line, 0, $index1);
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$domain = substr ($line, $index1 + 2, $index2 - $index1 - 2);
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$srv_ch = substr ($line, $index2 + 1, 16);
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$cli_ch = substr ($line, $index2 + 3 + 16 + 32, $index3 - $index2 - 3 - 16 - 32);
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$word = substr ($line, $index3 + 1);
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my $word_packed = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word_packed, $user, $domain, $srv_ch, $cli_ch);
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return ($new_hash, $word);
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}
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sub random_client_challenge
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{
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my $ch;
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$ch .= '0101000000000000';
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$ch .= random_hex_string (2 * 16);
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$ch .= '00000000';
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$ch .= random_hex_string (2 * random_count (20));
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$ch .= '00';
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return $ch;
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}
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1;
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