Proxmark3 community

nemer

Contributor

Registered: 2010-09-07

Posts: 34

About "hf 14a sim" or "hi14asim"

Hello everyone!This is my first try on the program of PM3 and I'm not good at programming .So Please point out my mistake ,THX.

Many friend,including me,are doubting how to simulate the Mifare Classic 1K UID.I tried to check the "iso14443a.c" and found the reason why the "hi14asim" doesn't work.
The original code is:

void SimulateIso14443aTag(int tagType, int TagUid)
{
  // This function contains the tag emulation
  // Prepare protocol messages
  static const uint8_t response1[] = { 0x44, 0x03 }; // Says: I am a DESFire Tag, ph33r me
  // UID response
      static const uint8_t response2[] = { 0x88, 0x04, 0x21, 0x3f, 0x4d }; // my desfire known uid - note   

SO,if we wanna simulate a MIFARE Classic UID,we need to chage it to :

void SimulateIso14443aTag(int tagType, int TagUid)
{
  // This function contains the tag emulation
  // Prepare protocol messages
  //static const uint8_t response1[] = { 0x44, 0x03 }; // Says: I am a DESFire Tag, ph33r me

                  static const uint8_t response1[] = { 0x04, 0x00 };//Nemer Edited

  // UID response
      //static const uint8_t response2[] = { 0x88, 0x04, 0x21, 0x3f, 0x4d }; // my desfire known uid - note 
  static const uint8_t response2[] ={ 0xd2, 0x37, 0x56, 0x48, 0xfb};//Nemer Edited

Now,it will simulate as Mifare card with UID:d2375648.The last byte"0xfb" is a crc and can be calculate by "XOR (UID1,UID2,UID3,UID4);

After this I tried to edit "cmdhf14a.c" and "iso14443a.c" ,because the parameter "TagUid" in the function above is not calculate ,transfered and used correctly ,though it should be.I want to calculate the crc in the function "int CmdHF14ASim(const char *Cmd)" from "cmdhf14a.c" .But ,for my poor programming ability,it still in wronging....

It will be very thankful if someone can help me .THX!

nemer

Contributor

Registered: 2010-09-07

Posts: 34

Re: About "hf 14a sim" or "hi14asim"

I reprogram the "int CmdHF14ASim(const char *Cmd)" from "cmdhf14a.c" like this:

int CmdHF14ASim(const char *Cmd)
{                                 
  int i, temp;
  uint8_t uid[4] = {0, 0, 0, 0};
  uint8_t wcrc=0;
  const char *cmdp  = Cmd;
  if (strlen(Cmd)<3) {
    PrintAndLog("Usage:  hf 14a mfsim  <uid (8 hex symbols)>");
    PrintAndLog("           sample: hf 14a mfsim 0a0a0a0a ");
    return 0;
  }  
  
  // skip spaces
  while (*cmdp==' ' || *cmdp=='\t') cmdp++;

  if (strlen(cmdp) != 8) {
    PrintAndLog("Length of UID must be 8 hex symbols");
    return 0;
  }
  
  for(i = 0; i < 4; i++) {
    sscanf((char[]){cmdp[0],cmdp[1],0},"%X",&temp);
    uid[i] = temp & 0xff;
    wcrc=wcrc^uin[i];
    cmdp++;
    cmdp++;
  }  
  PrintAndLog(" uid:%s ", sprint_hex(uid, 4));
  // c.arg should be set to *Cmd or convert *Cmd to the correct format for a uid
  UsbCommand c = {CMD_SIMULATE_TAG_ISO_14443a, {uid,wcrc}};
  PrintAndLog("Emulating 14443A TAG with UID %16x \n %16x ...", uid,wcrc);
  SendCommand(&c);
  return 0;
}

And chang

void SimulateIso14443aTag(int tagType, int *TagUid)
{
  // This function contains the tag emulation
  // Prepare protocol messages
  //static const uint8_t response1[] = { 0x44, 0x03 }; // Says: I am a DESFire Tag, ph33r me

                  static const uint8_t response1[] = { 0x04, 0x00 };//Nemer Edited

  // UID response
      //static const uint8_t response2[] = { 0x88, 0x04, 0x21, 0x3f, 0x4d }; // my desfire known uid - note 
      static const uint8_t *response2 =TagUid;//Nemer Edited

When compiling,it shows:
.....
iso14443a.c:940:error:conflicting type for 'SimulateIso14443aTag'
....
iso14443a.c:958:error:initialization from incompatible pointer type
iso14443a.c:958:error:initializer element is not constant

Help me ,anyone.

merlok

Contributor

Registered: 2011-05-16

Posts: 132

Re: About "hf 14a sim" or "hi14asim"

do you have correct declaration in iso14443a.h?

nemer

Contributor

Registered: 2010-09-07

Posts: 34

Re: About "hf 14a sim" or "hi14asim"

do you have correct declaration in iso14443a.h?

NO,but there is no delaration for SimulateIso14443aTag in iso14443a.h originally.
I found the data type of "{uid,wcrc}" is not correct during the transfer ,but have no idea with this problem.I am working on it .

nemer

Contributor

Registered: 2010-09-07

Posts: 34

Re: About "hf 14a sim" or "hi14asim"

Finally,I got it.The Uid[] can't be transport through c->arg[0].I mistaked the data type of it.
Now I followed http://www.proxmark.org/forum/viewtopic.php?id=747 and it works.
Thank you,merlok !