nfc-tools / mfcuk Goto Github PK

At revision 57:

Steps followed:

1. svn checkout http://mfcuk.googlecode.com/svn/trunk/ mfcuk-read-only
2. cd mfcuk-read-only
3. autoreconf -vis
4. automake
5. autoconf
6. PKG_CONFIG_PATH=../libnfc-read-only/ ./configure
7. make

When compiling on a eee pc 1000 h running Mac OS X Snow Leopard 10.6.3 with all 
the required libs (including libnfc 1.5.1) installed I get this error:

make  all-recursive
Making all in src
  CC     crapto1.o
In file included from crapto1.c:20:
crapto1.h: In function ‘parity’:
crapto1.h:64: warning: implicit declaration of function ‘asm’
crapto1.h:70: error: expected ‘)’ before ‘:’ token
make[2]: *** [crapto1.o] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2


The specified lines in crapto1.h look like this:


asm(    "movl %1, %%eax\n"
        "mov %%ax, %%cx\n"
        "shrl $0x10, %%eax\n"
        "xor %%ax, %%cx\n"
        "xor %%ch, %%cl\n"
        "setpo %%al\n"
        "movzx %%al, %0\n": "=r"(x): "r"(x): "eax","ecx");


I'm not a C guru but I don't see the problem.

What steps will reproduce the problem?

1. Device: ACR122u; Install acsccid pcsc drivers, pcscd, libnfc-1.7.1, 
mfoc-0.10.7
2. Pcsc_scan and libnfc recognize device and card.
3. Run 'mfoc -P 500 -O dump1.mfd'

What is the expected output? What do you see instead?

I expect to see a recovery of keys, instead. After guessing the default keys, 
I'm getting an error:
"Using sector 00 as an exploit sector
nfc_initiator_init: Input / Output Error"
The device shuts down after this.

What version of the product are you using? On what operating system?

mfoc 0.10.7 on Ubuntu 12.04LTS.


Please provide any additional information below.

Full mfoc run log:
http://pastebin.com/09XZhDWH

I can not recover the key with an 7 bytes uid card .

¿Do you have idea than how to solve this problem? 

I intent change the "define" of size of uid of 4 to 7 bytes without results.

I tried change the "define" of size of uid of 4 to 7 bytes without results.



mfcuk r65
libnfc 1.5

'./mfcuk_keyrecovery_darkside -h' has switched the descriptions for the 2 sleep 
settings -s and -S:

    fprintf(fp, "-S - miliseconds to sleep for CONSTANT DELAY\n");
    fprintf(fp, "-s - miliseconds to sleep for DROP FIELD\n");

should be changed to that:
    fprintf(fp, "-S - milliseconds to sleep for SLEEP_AT_FIELD_OFF (Default: %d ms)\n", SLEEP_AT_FIELD_OFF);
    fprintf(fp, "-s - milliseconds to sleep for SLEEP_AFTER_FIELD_ON (Default: %d ms)\n", SLEEP_AFTER_FIELD_ON);

At revision 62:

Steps followed:

1. svn checkout http://mfcuk.googlecode.com/svn/trunk/ mfcuk-read-only
2. cd mfcuk-read-only
3. autoreconf -vis
4. PKG_CONFIG_PATH=../libnfc-read-only/ ./configure
5. make

Compile works just fine.

When running "mfcuk -C -R 0:A" it works just fine, but if I change the 
verbosity level, let's say I add "-v 2" or "-v 3" to this command, I get:

"mfcuk - 0.3.3
Mifare Classic Darkside Key Recovery Tool - 0.3
by Andrei Costin, ***@gmail.com, http://andreicostin.com

Bus error"

The system I use is an ACR122U/Touchatag connected to an eee pc 1000 h running 
Mac OS X Snow Leopard 10.6.3 with all the required libs (including libnfc 
1.5.1) installed. Just for the record, all nfc-* scripts and mfoc run just fine.

/Dimitrios

Since 1.4.x, libnfc offers error handling, so it could be great to use it to 
better understand what happend.

Hello,

As title explains it, mfcuk need to be maintain to run on top of libnfc.

I already do the major part of the job: it now compile and should run similar 
than the old one, but unfortunately, I can't get it works.

Hi, I have segmentation fault each time I'm trying to recover keys.

What steps will reproduce the problem?
1. gdb ./mfcuk -C -R 0 -s 250 -S 250 -v 1
2. after a while I have this: 
Program received signal SIGSEGV, Segmentation fault.
0x00000000004031d0 in mfcuk_key_recovery_block 
(ui64KeyRecovered=0x7fffffff9938, uiBlock=3, bTagType=<optimized out>, 
    bKeyType=<optimized out>, uiUID=843309002, pnd=0x130c820, ui64Key=<optimized out>) at mfcuk.c:650
650         for (i = 0; (states_list) && ((states_list + i)->odd != 0 || 
(states_list + i)->even != 0) && (i < MAX_COMMON_PREFIX_STATES); i++) {


What version of the product are you using? On what operating system?
mfcuk from repository and 0.3.7,
Ubuntu 12.10, 64bit (I've been trying also on 32bit version, I didn't have seg 
fault, but recovered keys were wrong, only last bytes correct). 
gcc version 4.7.2 

I appreciate any suggestion on how to use mfcuk,
Best Regards,
Krzysiek

I'm using the libnfc 1.5 with mfcuk (i have to use it. the PR532 + UART) need 
it. 

The problem is: looks like some APIs from NFC lib changed. 

libnfc (from trunk)

mfcuk from trunk

Ubuntu 11.04, 64 bits

error:

[~/mfcuk-read-only] make 
make  all-recursive
make[1]: Betrete Verzeichnis '/home/xxx/mfcuk-read-only'
Making all in src
make[2]: Betrete Verzeichnis '/home/xxx/mfcuk-read-only/src'
  CC     crapto1.o
  CC     crypto1.o
  CC     mfcuk_finger.o
mfcuk_finger.c: In function ‘mfcuk_finger_skgt_decoder’:
mfcuk_finger.c:68:20: warning: unused variable ‘car_number’
  CC     mfcuk_keyrecovery_darkside.o
mfcuk_keyrecovery_darkside.c: In function ‘mfcuk_verify_key_block’:
mfcuk_keyrecovery_darkside.c:265:5: error: too few arguments to function 
‘nfc_initiator_transceive_bytes’
/usr/local/include/nfc/nfc.h:80:19: note: declared here
mfcuk_keyrecovery_darkside.c:272:5: warning: dereferencing type-punned pointer 
will break strict-aliasing rules
mfcuk_keyrecovery_darkside.c: In function ‘mfcuk_key_recovery_block’:
mfcuk_keyrecovery_darkside.c:417:5: error: too few arguments to function 
‘nfc_initiator_transceive_bytes’
/usr/local/include/nfc/nfc.h:80:19: note: declared here
mfcuk_keyrecovery_darkside.c:427:5: warning: dereferencing type-punned pointer 
will break strict-aliasing rules
mfcuk_keyrecovery_darkside.c: In function ‘main’:
mfcuk_keyrecovery_darkside.c:1108:21: warning: dereferencing type-punned 
pointer will break strict-aliasing rules
mfcuk_keyrecovery_darkside.c:1326:61: warning: comparison between signed and 
unsigned integer expressions
mfcuk_keyrecovery_darkside.c:1488:13: warning: dereferencing type-punned 
pointer will break strict-aliasing rules
mfcuk_keyrecovery_darkside.c:1539:5: warning: dereferencing type-punned pointer 
will break strict-aliasing rules
mfcuk_keyrecovery_darkside.c:1545:9: warning: dereferencing type-punned pointer 
will break strict-aliasing rules
mfcuk_keyrecovery_darkside.c: At top level:
crapto1.h:60:23: warning: ‘parity’ defined but not used
mfcuk_keyrecovery_darkside.c: In function ‘main’:
mfcuk_keyrecovery_darkside.c:992:5: warning: ignoring return value of 
‘system’, declared with attribute warn_unused_result
make[2]: *** [mfcuk_keyrecovery_darkside.o] Fehler 1
make[2]: Verlasse Verzeichnis '/home/victor.pereira/mfcuk-read-only/src'
make[1]: *** [all-recursive] Fehler 1
make[1]: Verlasse Verzeichnis '/home/victor.pereira/mfcuk-read-only'
make: *** [all] Fehler 2

Hi,

I'm running r94. I've been trying with two different readers now (ACL122U and 
SCL3711) and three different series of cards. The basic symptom is that the 
random generator in the card is still weak, but the attack doesn't progress 
nevertheless; it seems MFCUK never gets to the point where it gets the 1/256 
guess right and gets the NACK back. Example:

-----------------------------------------------------
Let me entertain you!
    uid: <removed>
   type: 08
    key: 000000000000
  block: 03
diff Nt: 144
  auths: 92264
-----------------------------------------------------

With 92k auths and only 144 different Nts, every Nt should have _at least_ 638 
attempts on it (in reality probably much more, as some Nt values are much more 
common than others), which is above 256, and the attack should have succeeded 
long ago as I understand it.

MFOC succeeds for the card where I have a known key, so the basics of my NFC 
setup appears to be okay.

Has anyone seen this before?

What should we do when we use ubuntu 9.10 386 version.
It works ,but not actually what we expected.

autoreconf -vis
automake --add-missing
autoconf
./configure

What steps will reproduce the problem?
svn checkout http://mfcuk.googlecode.com/svn/trunk mfcuk
cd mfcuk
autoreconf -vis
./configure
make

What is the expected output? What do you see instead?
In file included from crapto1.c:20:
crapto1.h: In function âparityâ:
crapto1.h:69: warning: implicit declaration of function âasmâ
crapto1.h:75: error: expected â)â before â:â token
make[2]: *** [crapto1.o] Error 1
make[2]: Leaving directory `/root/mfcuk/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/root/mfcuk'
make: *** [all] Error 2


What version of the product are you using? On what operating system?
Version 80
OS: Debian 2.6.32-5-686

Please provide any additional information below.
Change line 69 in crapto1.h to 
__asm__("movl %1, %%eax\n"

(add four underscores) 

What steps will reproduce the problem?
1. autoreconf -vis
2. ./configure
3. make distcheck

What steps will reproduce the problem?
1. make

What is the expected output? What do you see instead?
of course successfully make,but error reported and failed. i think there's 
something changed in the new libnfc-1.7.0-rc7 version. 

What version of the product are you using? On what operating system?
Distributor ID: Ubuntu
Description:    Ubuntu 12.04
Release:        12.04

libnfc-1.7.0-rc7

Please provide any additional information below.
xxx@xxx-laptop:~/Downloads/mfcuk-0.3.7$ make
make  all-recursive
make[1]: Entering directory `/home/xxx/Downloads/mfcuk-0.3.7'
Making all in src
make[2]: Entering directory `/home/xxx/Downloads/mfcuk-0.3.7/src'
  CC     crapto1.o
  CC     crypto1.o
  CC     mifare.o
  CC     nfc-utils.o
nfc-utils.c: In function ‘print_nfc_target’:
nfc-utils.c:121:3: error: incompatible type for argument 2 of 
‘str_nfc_target’
/usr/local/include/nfc/nfc.h:146:18: note: expected ‘const struct nfc_target 
*’ but argument is of type ‘nfc_target’
make[2]: *** [nfc-utils.o] Error 1
make[2]: Leaving directory `/home/xxx/Downloads/mfcuk-0.3.7/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/xxx/Downloads/mfcuk-0.3.7'
make: *** [all] Error 2

nfc-utils.c should be updated to work with the current libnfc svn.
This change was introduced in libnfc r1116.

===================================================================
--- nfc-utils.c (revision 49)
+++ nfc-utils.c (working copy)
@@ -210,8 +210,7 @@
         strcpy(pndd->pcDriver, strtok(buffer, ":"));

         // Port.
-        pndd->pcPort = (char *)malloc(256);
-        strcpy(pndd->pcPort, strtok(NULL, ":"));
+        strcpy(pndd->acPort, strtok(NULL, ":"));

         // Speed.
         sscanf(strtok(NULL, ":"), "%u", &pndd->uiSpeed);

rosario@rosario:~/mfcuk/src$ ./mfcuk -C -R 0:A -w 6 -v 3
mfcuk - 0.3.8
Mifare Classic DarkSide Key Recovery Tool - 0.3
by Andrei Costin, [email protected], http://andreicostin.com

TRESHOLD: 6

INFO: Connected to NFC reader: ACS / ACR122U PICC Interface

VERIFY: 
	Key A sectors: 0Errore di segmentazione (core dump creato)

rosario@rosario:~/mfcuk/src$ nfc-list
nfc-list uses libnfc 1.7.1
NFC device: ACS / ACR122U PICC Interface opened
1 ISO14443A passive target(s) found:
ISO/IEC 14443A (106 kbps) target:
    ATQA (SENS_RES): 00  04  
       UID (NFCID1): de  09  9e  6e  
      SAK (SEL_RES): 09  

What steps will reproduce the problem?
1. /mfcuk-0.3.8
2. ./configure
3. make


What is the expected output? What do you see instead?
when running make it gives a output.
[code]
make  all-recursive
make[1]: Entering directory `/nfc/mfcuk-0.3.8'
Making all in src
make[2]: Entering directory `/nfc/mfcuk-0.3.8/src'
  CC     crapto1.o
  CC     crypto1.o
  CC     mifare.o
  CC     nfc-utils.o
  CC     mfcuk_mifare.o
  CC     mfcuk_finger.o
  CC     mfcuk_utils.o
  CC     xgetopt.o
  CC     mfcuk.o
mfcuk.c:248:17: warning: ‘mfcuk_verify_key_block’ defined but not used 
[-Wunused-function]
 static uint32_t mfcuk_verify_key_block(nfc_device *pnd, uint32_t uiUID, uint64_t ui64Key, mifare_key_type bKeyType, uint8_t bTagType, uint32_t uiBlock)
                 ^
  CCLD   mfcuk
make[2]: Leaving directory `/nfc/mfcuk-0.3.8/src'
make[2]: Entering directory `/mfcuk-0.3.8'
make[2]: Leaving directory `/nfc/mfcuk-0.3.8'
make[1]: Leaving directory `/nfc/mfcuk-0.3.8'
[/code]

it wont crack any keys, output of mfcuk -C -R 0:A -v 3
[code]

Let me entertain you!
    uid: -xxxxxxx-
   type: 18
    key: 000000000000
  block: 5b
diff Nt: 65535
  auths: 65537
-----------------------------------------------------

-----------------------------------------------------
Let me entertain you!
    uid: -xxxxxx-
   type: 18
    key: 000000000000
  block: 5b
diff Nt: 65536
  auths: 65538
-----------------------------------------------------
mfcuk_keyrecovery_darkside: ERROR: mfcuk_key_recovery_block() (error code=0x09)
 [/code]

What version of the product are you using? On what operating system?
uname -a
Linux 3.10-2-amd64 #1 SMP Debian 3.10.7-1 (2013-08-17) x86_64 GNU/Linux

libnfc-1.7.0
mfcuk-0.3.8

Please provide any additional information below.

Since the last change on nfc-utils.c it is not able to compile:
nfc-utils.c:213:20: error: ‘nfc_device_desc_t’ has no member named 
‘acPort’

What steps will reproduce the problem?
1. When I try to compile 'make'
2.
3.

What is the expected output? What do you see instead?

nfc-utils.o: In function `print_nfc_target':
/home/wender/Downloads/mfcuk-read-only/src/nfc-utils.c:121: undefined reference 
to `str_nfc_target'
collect2: error: ld returned 1 exit status
make[2]: *** [mfcuk] Error 1
make[2]: Leaving directory `/home/wender/Downloads/mfcuk-read-only/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/wender/Downloads/mfcuk-read-only'
make: *** [all] Error 2



What version of the product are you using? On what operating system?
mfcuk r80 / Ubuntu 12.10


Please provide any additional information below.
I'm trying to compile mfcuk r80 using ubuntu 12.10 with libnfc-1.6.0-rc1.
I have one SCL3711 usb dongle PN53x.

Thanks

mfcuk -C -R 0:A -v 1 -o lalal.dmp

mfcuk - 0.3.8
Mifare Classic DarkSide Key Recovery Tool - 0.3
by Andrei Costin, [email protected], http://andreicostin.com

WARN: cannot open template file './data/tmpls_fingerprints/mfcuk_tmpl_skgt.mfd'
WARN: cannot open template file './data/tmpls_fingerprints/mfcuk_tmpl_ratb.mfd'
WARN: cannot open template file 
'./data/tmpls_fingerprints/mfcuk_tmpl_oyster.mfd'

INFO: Connected to NFC reader: ACS / ACR122U PICC Interface



INITIAL ACTIONS MATRIX - UID fb d5 dc 7f - TYPE 0x08 (MC1K)
---------------------------------------------------------------------
Sector  |    Key A  |ACTS | RESL    |    Key B  |ACTS | RESL
---------------------------------------------------------------------
0   |  000000000000 | . R | . . |  000000000000 | . . | . .
1   |  000000000000 | . . | . . |  000000000000 | . . | . .
2   |  000000000000 | . . | . . |  000000000000 | . . | . .
3   |  000000000000 | . . | . . |  000000000000 | . . | . .
4   |  000000000000 | . . | . . |  000000000000 | . . | . .
5   |  000000000000 | . . | . . |  000000000000 | . . | . .
6   |  000000000000 | . . | . . |  000000000000 | . . | . .
7   |  000000000000 | . . | . . |  000000000000 | . . | . .
8   |  000000000000 | . . | . . |  000000000000 | . . | . .
9   |  000000000000 | . . | . . |  000000000000 | . . | . .
10  |  000000000000 | . . | . . |  000000000000 | . . | . .
11  |  000000000000 | . . | . . |  000000000000 | . . | . .
12  |  000000000000 | . . | . . |  000000000000 | . . | . .
13  |  000000000000 | . . | . . |  000000000000 | . . | . .
14  |  000000000000 | . . | . . |  000000000000 | . . | . .
15  |  000000000000 | . . | . . |  000000000000 | . . | . .


VERIFY: 
    Key A sectors: 0 1 2 3 4 5 6 7 8 9 a b c d e f
    Key B sectors: 0 1 2 3 4 5 6 7 8 9 a b c d e f


ACTION RESULTS MATRIX AFTER VERIFY - UID fb d5 dc 7f - TYPE 0x08 (MC1K)
---------------------------------------------------------------------
Sector  |    Key A  |ACTS | RESL    |    Key B  |ACTS | RESL
---------------------------------------------------------------------
0   |  000000000000 | . R | . . |  000000000000 | . . | . .
1   |  000000000000 | . . | . . |  000000000000 | . . | . .
2   |  000000000000 | . . | . . |  000000000000 | . . | . .
3   |  000000000000 | . . | . . |  000000000000 | . . | . .
4   |  000000000000 | . . | . . |  000000000000 | . . | . .
5   |  000000000000 | . . | . . |  000000000000 | . . | . .
6   |  000000000000 | . . | . . |  000000000000 | . . | . .
7   |  000000000000 | . . | . . |  000000000000 | . . | . .
8   |  000000000000 | . . | . . |  000000000000 | . . | . .
9   |  000000000000 | . . | . . |  000000000000 | . . | . .
10  |  000000000000 | . . | . . |  000000000000 | . . | . .
11  |  000000000000 | . . | . . |  000000000000 | . . | . .
12  |  000000000000 | . . | . . |  000000000000 | . . | . .
13  |  000000000000 | . . | . . |  000000000000 | . . | . .
14  |  000000000000 | . . | . . |  000000000000 | . . | . .
15  |  000000000000 | . . | . . |  000000000000 | . . | . .


RECOVER:  0mfcuk: ERROR: mfcuk_key_recovery_block() (error code=0x03)
mfcuk: ERROR: mfcuk_key_recovery_block() (error code=0x03)


and he cant recover any key

At revision 57:

Steps followed:

1. svn checkout http://mfcuk.googlecode.com/svn/trunk/ mfcuk-read-only
2. cd mfcuk-read-only
3. autoreconf -vis
4. automake
5. autoconf
6. PKG_CONFIG_PATH=../libnfc-read-only/ ./configure
7. make

When compiling on a eee pc 1000 h running Mac OS X Snow Leopard 10.6.3 with all 
the required libs (including libnfc 1.5.1) installed I get this error:

make  all-recursive
Making all in src
  CC     crapto1.o
  CC     crypto1.o
  CC     mifare.o
  CC     nfc-utils.o
nfc-utils.c: In function ‘parse_args’:
nfc-utils.c:654: error: ‘nfc_device_desc_t’ has no member named ‘pcPort’
nfc-utils.c:655: error: ‘nfc_device_desc_t’ has no member named ‘pcPort’
nfc-utils.c:655: error: ‘nfc_device_desc_t’ has no member named ‘pcPort’
nfc-utils.c:655: error: ‘nfc_device_desc_t’ has no member named ‘pcPort’
nfc-utils.c:655: error: ‘nfc_device_desc_t’ has no member named ‘pcPort’
nfc-utils.c: In function ‘print_nfc_target’:
nfc-utils.c:698: warning: enumeration value ‘NMT_ISO14443BI’ not handled in 
switch
nfc-utils.c:698: warning: enumeration value ‘NMT_ISO14443B2SR’ not handled 
in switch
nfc-utils.c:698: warning: enumeration value ‘NMT_ISO14443B2CT’ not handled 
in switch
make[2]: *** [nfc-utils.o] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

Maintainance update to work with a recent version of libnfc.

Attached patch seems to work. Please verify.

Greetings

Volker Zeihs
Jonas Groß

Hi, just as tip

To compile it with Linux 32 bits I took the following approach

I passed to configure the following flags:


I commented the following lines at configure.ac

AC_FUNC_MALLOC
AC_FUNC_REALLOC

both functions are specific for 64 bits

./configure CFLAGS="-m32" LDFLAGS="-m32"

can we do this check automatically and just add the two AC_FUNC_*LLOC 
directives if our target is 64 bits?

What steps will reproduce the problem?
1. ./configure
2. make
3. src/mfcuk_keyrecovery_darkside -C

when i tried to compile with cygwin it give me this error

$ make
gcc -DHAVE_CONFIG_H -I. -I..     -g -O2 -I/usr/local/include -I/usr/include/PCSC
   -MT mfcuk_keyrecovery_darkside.o -MD -MP -MF .deps/mfcuk_keyrecovery_darkside
.Tpo -c -o mfcuk_keyrecovery_darkside.o mfcuk_keyrecovery_darkside.c
mv -f .deps/mfcuk_keyrecovery_darkside.Tpo .deps/mfcuk_keyrecovery_darkside.Po
gcc  -g -O2 -I/usr/local/include -I/usr/include/PCSC     -o mfcuk_keyrecovery_da
rkside.exe crapto1.o crypto1.o mfcuk_finger.o mfcuk_keyrecovery_darkside.o mfcuk
_mifare.o mfcuk_utils.o mifare.o nfc-utils.o -lnfc -lusb -lpcsclite -lnfc
mfcuk_keyrecovery_darkside.o: In function `mfcuk_verify_key_block':
/home/yoyoy/mf/src/mfcuk_keyrecovery_darkside.c:253: undefined reference to 
`_iso14443a_crc_append'
mfcuk_keyrecovery_darkside.o: In function `mfcuk_key_recovery_block':
/home/yoyoy/mf/src/mfcuk_keyrecovery_darkside.c:407: undefined reference to 
`_iso14443a_crc_append'
collect2: ld returned 1 exit status
make: *** [mfcuk_keyrecovery_darkside.exe] Error 1

i have tried with r45 and r49 and have the same problem with r45 give me more 
errors

if i erase this line `_iso14443a_crc_append' it works but the program when i 
try to recover the keys it always give me error 0x04 all the time

This issue was created by revision r46.

Currently there is some code that is not clean:
 - code indentation is not always the same
 - useless blank lines
 - turn on "-Wall -pedantic -Wextra" C-flags and see all code that have to be cleaned

the are to bugs int the code.

1º

if you want to compile on 32-bit you have to change in crapto1.h


 asm(    "movl %1, %%eax\n"

to this

__asm__("movl %1, %%eax\n"




2º

when any version if is compiled on 32-bit system, dosen't work 


the last 2 bytes of the keys are always good, but the first 4 bytes are always 
wrong (sometimes random, sometimes the same).

the problem is here i think

#if !defined __i386__ || !defined __GNUC__
        x ^= x >> 16;
        x ^= x >> 8;
        x ^= x >> 4;
        return BIT(0x6996, x & 0xf);

i think this is not correct, i have to look more deep


lot of people have problems with this issue

http://www.libnfc.org/community/topic/98/mifare-classic-key-recovery-tool-dark-s
ide-attack/page/3/

if (block == 0xFFFFFFFF) {
    printf("The card is not a Mifare Classic card");
    return 1;
}

Hello I'm french, so sorry for the translation, here is my problem:
I have a chip reader ACS 122U-A9 and I want to hack a Mifare Classic 1k (ISO 
14443 Type A), I use a virtual machine (VirtualBox and Backtrack 5 R3) under 
64-bit Windows 7, I installed :
libnfc-1.7.0-rc7
ACR122 drivers on www.acs.com.hk website
mfoc0.10.2
Thank you very much for answering me because I'm desperate not to find the keys 
A and B

I came not to do detect my card reader with libnfc-1.7.0-rc7 with nfc-list 
function why? 
I get to do detect the card reader with libnfc-1.4.2 
I try to use MFOC-0.10.2, I 500-O-P MFOC dump, but it reads the sector 8, 500 
times without finding the key B, which then try? 
thank you to answer me please. 

1. git clone https://code.google.com/p/libnfc/ 
2. autoreconf -vis
3. ./configure --with-driver=pn32_uart --enable-serial-autoprobe
4. make
5. make install
6. sudo ldconfig

1.  svn checkout http://mfcuk.googlecode.com/svn/trunk/ mfcuk-read-only 
2.  autoreconf -vis
3.  ./configure
4.  make  
5.  src/mfcuk -C -R 0:A -s 250 -S 250 -v 3


after a long!!! time this is what i get

[code]

Let me entertain you!
    uid: -xxxxxxx-
   type: 18
    key: 000000000000
  block: 5b
diff Nt: 65535
  auths: 65537
-----------------------------------------------------

-----------------------------------------------------
Let me entertain you!
    uid: -xxxxxx-
   type: 18
    key: 000000000000
  block: 5b
diff Nt: 65536
  auths: 65538
-----------------------------------------------------
mfcuk_keyrecovery_darkside: ERROR: mfcuk_key_recovery_block() (error code=0x09)
 [/code]

when compiling mfcuk i have a make warning;



 [code]
mfcuk.c:248:17: warning: ‘mfcuk_verify_key_block’ defined but not used 
[-Wunused-function]
 static uint32_t mfcuk_verify_key_block(nfc_device *pnd, uint32_t uiUID, uint64_t ui64Key, mifare_key_type bKeyType, uint8_t bTagType, uint32_t uiBlock)
[/code]

this problem is here with versions 0.3.5-0.3.8

i can use the -V option with the -D and it will find the default key's
but for some reason the -R option will not work, even when i add a default key 
with the -d option.

please help.....!!!

uname 
Linux 3.10-2-amd64 #1 SMP Debian 3.10.7-1 (2013-08-17) x86_64 GNU/Linux

i am using the pn532_uart breakout board v1.6

What steps will reproduce the problem?
1. ./configure
2. make
3. src/mfcuk_keyrecovery_darkside -C

What is the expected output?
That should find data files

What do you see instead?
mfcuk - 0.3.2
Mifare Classic DarkSide Key Recovery Tool - 0.3
by Andrei Costin, [email protected], http://andreicostin.com

WARN: cannot open template file './data/tmpls_fingerprints/mfcuk_tmpl_skgt.mfd'
WARN: cannot open template file './data/tmpls_fingerprints/mfcuk_tmpl_ratb.mfd'
WARN: cannot open template file 
'./data/tmpls_fingerprints/mfcuk_tmpl_oyster.mfd'

(originally reported by thefkboss on issue 19)

the last 2 bytes of the keys are always good, but the first 4 bytes are always 
wrong (sometimes random, sometimes the same).

the problem is here i think

#if !defined __i386__ || !defined __GNUC__
        x ^= x >> 16;
        x ^= x >> 8;
        x ^= x >> 4;
        return BIT(0x6996, x & 0xf);

i think this is not correct, i have to look more deep


lot of people have problems with this issue

http://www.libnfc.org/community/topic/98/mifare-classic-key-recovery-tool-dark-s
ide-attack/page/3/