decode GPB on sector trailer 0

diff --git a/mifare-mad.pl b/mifare-mad.pl
index a9681a1..1748d6d 100755 (executable)
--- a/mifare-mad.pl
+++ b/mifare-mad.pl
@@ -76,6 +76,11 @@ foreach my $i ( 0 .. 15 ) {
                        , unpack('H*',substr($card,4,1))
                        , unpack('H*',substr($card,5,11))
                        ;
+               # General purpose byte (GPB)
+               my $gdp = ord(substr($card,$pos+0x39,1));
+               printf "ADV (MAD version code): %d\n", $gdp & 0b00000011;
+               printf "MA (multiapplication): %s\n",  $gdp & 0b01000000 ? 'yes' : 'monoaplication';
+               printf "DA (MAD available): %s\n",     $gdp & 0b10000000 ? 'yes' : 'no';
        } else {
                my $v = unpack('v',(substr($card, 0x10 + ( $i * 2 ), 2)));
                my $cluster_id = unpack('HH', (( $v & 0xff00 ) >> 8) );
@@ -132,9 +137,10 @@ foreach my $i ( 0 .. 15 ) {
        }
 
 
-       printf "KEY A:%s | %s | B:%s\n"
+       printf "KEY A:%s | %s GDP: %s | B:%s\n"
                ,unpack('H*',substr($card,$pos+0x30   ,6))
-               ,unpack('H*',substr($card,$pos+0x30+6 ,4))
+               ,unpack('H*',substr($card,$pos+0x30+6 ,3))
+               ,unpack('H*',substr($card,$pos+0x30+9 ,1))
                ,unpack('H*',substr($card,$pos+0x30+10,6))
                ;