find RC632 key patters in files

[perl-Mifare-MAD.git] / nfc-card-dumper.pl

diff --git a/nfc-card-dumper.pl b/nfc-card-dumper.pl
index ffdecc9..37bee84 100755 (executable)
--- a/nfc-card-dumper.pl
+++ b/nfc-card-dumper.pl
@@ -6,11 +6,24 @@ use RFID::Libnfc::Reader;
 use RFID::Libnfc::Constants;
 use File::Slurp;
 use Digest::MD5 qw(md5_hex);
+use Getopt::Long::Descriptive;
 
 use Data::Dump qw(dump);
 
+my ($opt,$usage) = describe_options(
+       '%c %c [dump_with_keys]',
+       [ 'write=s',    'write dump to card' ],
+       [ 'verify!',    'verify writes', { default => 1 } ],
+       [ 'debug|d',    'show debug dumps' ],
+       [ 'help|h',             'usage' ],
+);
+print $usage->text, exit if $opt->help;
+
 my $debug = $ENV{DEBUG} || 0;
-my $keyfile = shift @ARGV;
+our $keyfile = shift @ARGV;
+our ( $tag, $uid, $card_key_file );
+
+sub write_card_dump;
 
 my $r = RFID::Libnfc::Reader->new(debug => $debug);
 if ($r->init()) {
@@ -24,9 +37,9 @@ if ($r->init()) {
         exit -1;
     }
 
-       my $uid = sprintf "%02x%02x%02x%02x", @{ $tag->uid };
+       $uid = sprintf "%02x%02x%02x%02x", @{ $tag->uid };
 
-       my $card_key_file = "cards/$uid.key";
+       $card_key_file = "cards/$uid.key";
        $keyfile ||= $card_key_file;
 
        if ( -e $keyfile ) {
@@ -39,7 +52,7 @@ if ($r->init()) {
 
        my $card;
 
-       print STDERR "$uid reading blocks ";
+       print STDERR "reading $uid blocks ";
     for (my $i = 0; $i < $tag->blocks; $i++) {
         if (my $data = $tag->read_block($i)) {
             # if we are dumping an ultralight token, 
@@ -58,7 +71,7 @@ if ($r->init()) {
                        my $yes = <STDIN>; chomp $yes;
                        exit unless $yes =~ m/y/i || $yes eq '';
 
-                       my $file = "cards/$uid.keys";
+                       my $file = "cards/$uid.key";
                        unlink $file;
                        warn "# finding keys for card $uid with: mfoc -O $file\n";
                        exec "mfoc -O $file" || die $!;
@@ -68,6 +81,37 @@ if ($r->init()) {
     }
        print STDERR "done\n";
 
+       my $out_file = write_card_dump $tag => $card;
+
+       if ( $opt->write ) {
+               $card = read_file $opt->write;
+               foreach my $block ( 0 .. $tag->blocks ) {
+                       my $offset = 0x10 * $block;
+                       my $data = substr($card,$offset,0x10);
+                       print STDERR "writing $uid block $block";
+                       $tag->write_block( $block, $data );
+                       if ( $opt->verify ) {
+                               print STDERR " verify ";
+                               my $verify = $tag->read_block( $block );
+                               print STDERR $verify eq $data ? "OK" : "ERROR";
+                       }
+                       print STDERR "\n";
+               }
+               print STDERR "done\n";
+               unlink $card_key_file;
+               $out_file = write_card_dump $tag => $card;
+       } else {
+               # view dump
+               my $txt_file = $out_file;
+               $txt_file =~ s/\.mfd/.txt/ || die "can't change extension of $out_file to txt";
+               system "./mifare-mad.pl $out_file > $txt_file";
+               $ENV{MAD} && system "vi $txt_file";
+       }
+}
+
+sub write_card_dump {
+       my ( $tag, $card ) = @_;
+
        # re-insert keys into dump
        my $keys = $tag->{_keys} || die "can't find _keys";
        foreach my $i ( 0 .. $#$keys ) {
@@ -87,21 +131,20 @@ if ($r->init()) {
        }
 
        my $md5 = md5_hex($card);
-       my $out_file = "cards/$uid.$md5";
+       my $out_file = "cards/$uid.$md5.mfd";
        if ( -e $out_file ) {
                warn "$out_file allready exists, not overwriting\n";
        } else {
                write_file $out_file, $card;
                warn "$out_file ", -s $out_file, " bytes key: $card_key_file\n";
-               if ( ! -e $card_key_file ) {
-                       $out_file =~ s{^cards/}{} || die "can't strip directory from out_file";
-                       symlink $out_file, $card_key_file || die "$card_key_file: $!";
-                       warn "$card_key_file symlink created as default key for $uid\n";
-               }
        }
 
-       # view dump
-       system "./mifare-mad.pl $out_file > $out_file.txt";
-       $ENV{MAD} && system "vi $out_file.txt";
-}
+       if ( ! -e $card_key_file ) {
+               my $source = $out_file;
+               $source =~ s{^cards/}{} || die "can't strip directory from out_file";
+               symlink $source, $card_key_file || die "$card_key_file: $!";
+               warn "$card_key_file symlink created as default key for $uid\n";
+       }
 
+       return $out_file;
+}