crewID/libnfc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

nfc-mfclassic: handle 7-byte UID cards & MFC Mini

Browse source
This commit is contained in:
Philippe Teuwen 2011-05-26 22:49:45 +00:00
parent 96538d052b
commit f4c3d9d4ed
1 changed files with 36 additions and 38 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

74
examples/nfc-mfclassic.c
View file

@ -126,35 +126,29 @@ authenticate (uint32_t uiBlock)
uint32_t uiTrailerBlock;
size_t key_index;
// Set the authentication information (uid)
memcpy (mp.mpa.abtUid, nt.nti.nai.abtUid + nt.nti.nai.szUidLen - 4, 4);
// Should we use key A or B?
mc = (bUseKeyA) ? MC_AUTH_A : MC_AUTH_B;
// Key file authentication.
if (bUseKeyFile) {
// Set the authentication information (uid)
memcpy (mp.mpa.abtUid, nt.nti.nai.abtUid, 4);
// Locate the trailer (with the keys) used for this sector
uiTrailerBlock = get_trailer_block (uiBlock);
// Determin if we should use the a or the b key
if (bUseKeyA) {
mc = MC_AUTH_A;
// Extract the right key from dump file
if (bUseKeyA)
memcpy (mp.mpa.abtKey, mtKeys.amb[uiTrailerBlock].mbt.abtKeyA, 6);
} else {
mc = MC_AUTH_B;
else
memcpy (mp.mpa.abtKey, mtKeys.amb[uiTrailerBlock].mbt.abtKeyB, 6);
}
// Try to authenticate for the current sector
if (nfc_initiator_mifare_cmd (pnd, mc, uiBlock, &mp))
return true;
}
// Auto authentication.
else {
// Determin if we should use the a or the b key
mc = (bUseKeyA) ? MC_AUTH_A : MC_AUTH_B;
// Set the authentication information (uid)
memcpy (mp.mpa.abtUid, nt.nti.nai.abtUid, 4);
} else {
// Try to guess the right key
for (key_index = 0; key_index < num_keys; key_index++) {
memcpy (mp.mpa.abtKey, keys + (key_index * 6), 6);
if (nfc_initiator_mifare_cmd (pnd, mc, uiBlock, &mp)) {
@ -162,11 +156,9 @@ authenticate (uint32_t uiBlock)
memcpy (mtKeys.amb[uiBlock].mbt.abtKeyA, &mp.mpa.abtKey, 6);
else
memcpy (mtKeys.amb[uiBlock].mbt.abtKeyB, &mp.mpa.abtKey, 6);
return true;
}
nfc_initiator_select_passive_target (pnd, nmMifare, mp.mpa.abtUid, 4, NULL);
nfc_initiator_select_passive_target (pnd, nmMifare, nt.nti.nai.abtUid, nt.nti.nai.szUidLen, NULL);
}
}
@ -351,7 +343,6 @@ print_usage (const char *pcProgramName)
int
main (int argc, const char *argv[])
{
bool b4K;
action_t atAction = ACTION_USAGE;
byte_t *pbtUID;
FILE *pfKeys = NULL;
@ -454,29 +445,36 @@ main (int argc, const char *argv[])
}
// Test if we are dealing with a MIFARE compatible tag
if ((nt.nti.nai.btSak & 0x08) == 0) {
printf ("Error: tag is not a MIFARE Classic card\n");
nfc_disconnect (pnd);
exit (EXIT_FAILURE);
printf ("Warning: tag is probably not a MFC!\n");
}
if (bUseKeyFile) {
// Get the info from the key dump
b4K = (mtKeys.amb[0].mbm.abtATQA[1] == 0x02);
pbtUID = mtKeys.amb[0].mbm.abtUID;
// Compare if key dump UID is the same as the current tag UID
if (memcmp (nt.nti.nai.abtUid, pbtUID, 4) != 0) {
printf ("Expected MIFARE Classic %ck card with UID: %02x%02x%02x%02x\n", b4K ? '4' : '1', pbtUID[0], pbtUID[1],
pbtUID[2], pbtUID[3]);
}
}
// Get the info from the current tag
pbtUID = nt.nti.nai.abtUid;
b4K = (nt.nti.nai.abtAtqa[1] == 0x02);
printf ("Found MIFARE Classic %ck card:\n", b4K ? '4' : '1');
if (bUseKeyFile) {
byte_t fileUid[4];
memcpy (fileUid, mtKeys.amb[0].mbm.abtUID, 4);
// Compare if key dump UID is the same as the current tag UID, at least for the first 4 bytes
if (memcmp (nt.nti.nai.abtUid, fileUid, 4) != 0) {
printf ("Expected MIFARE Classic card with UID starting as: %02x%02x%02x%02x\n",
fileUid[0], fileUid[1], fileUid[2], fileUid[3]);
}
}
printf ("Found MIFARE Classic card:\n");
print_nfc_iso14443a_info (nt.nti.nai, false);
uiBlocks = (b4K) ? 0xff : 0x3f;
// Guessing size
if ((nt.nti.nai.abtAtqa[1] & 0x02) == 0x02)
// 4K
uiBlocks = 0xff;
else if ((nt.nti.nai.btSak & 0x01) == 0x01)
// 320b
uiBlocks = 0x13;
else
// 1K
// TODO: for MFP it is 0x7f (2K) but how to be sure it's a MFP? Try to get RATS?
uiBlocks = 0x3f;
printf ("Guessing size: seems to be a %i-byte card\n", (uiBlocks + 1) * 16);
if (atAction == ACTION_READ) {
if (read_card ()) {