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120 lines
2.2 KiB
Perl
120 lines
2.2 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 Crypt::RC4;
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use Digest::MD5 qw (md5);
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use Encode;
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sub module_constraints { [[-1, -1], [-1, -1], [0, 15], [32, 32], [-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 $param = shift;
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my $param2 = shift;
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my $salt_bin = pack ("H*", $salt);
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my $tmp = md5 (encode ("UTF-16LE", $word));
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$tmp = substr ($tmp, 0, 5);
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my $data;
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for (my $i = 0; $i < 16; $i++)
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{
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$data .= $tmp;
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$data .= $salt_bin;
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}
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$tmp = md5 ($data);
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$tmp = substr ($tmp, 0, 5);
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my $version;
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if (defined $param2)
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{
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$version = $param2;
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}
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else
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{
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$version = (unpack ("L", $tmp) & 1) ? 0 : 1;
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}
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my $rc4_key = md5 ($tmp . "\x00\x00\x00\x00");
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my $m = Crypt::RC4->new (substr ($rc4_key, 0, 16));
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my $encdata;
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if (defined $param)
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{
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$encdata = $m->RC4 (pack ("H*", $param));
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}
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else
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{
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$encdata = "A" x 16; ## can be anything
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}
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my $data1_buf = $encdata;
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my $data2_buf = md5 (substr ($data1_buf, 0, 16));
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$m = Crypt::RC4->new (substr ($rc4_key, 0, 16));
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my $encrypted1 = $m->RC4 ($data1_buf);
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my $encrypted2 = $m->RC4 ($data2_buf);
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my $hash = sprintf ("\$oldoffice\$%d*%s*%s*%s", $version, $salt, unpack ("H*", $encrypted1), unpack ("H*", $encrypted2));
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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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# Office Old $1 $2
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my ($hash_in, $word) = split ":", $line;
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return unless defined $hash_in;
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return unless defined $word;
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my @data = split /\*/, $hash_in;
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return unless scalar @data == 4;
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my $signature = shift @data;
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return unless (($signature eq '$oldoffice$0') || ($signature eq '$oldoffice$1'));
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return unless (length $data[0] == 32);
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return unless (length $data[1] == 32);
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return unless (length $data[2] == 32);
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my $salt = shift @data;
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my $param = shift @data;
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my $param2 = substr ($signature, 11, 1);
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return unless defined $salt;
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return unless defined $word;
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return unless defined $param;
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return unless defined $param2;
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$word = pack_if_HEX_notation ($word);
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my $new_hash = module_generate_hash ($word, $salt, $param, $param2);
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return ($new_hash, $word);
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}
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1;
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