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Updated hf iclass tearoff

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1- Automated tearoff for epurse without needing to pass the block data (manual mode still available)
2- Improved read loop of original values (to reduce instances in which the block appears zeroed out)
3- Added a "fault tolerance" system to increase the threshold of read errors for old silicon cards before being shown to the user
4- Removed auth requirement to read blocks below 3
This commit is contained in:
Antiklesys 2025-06-02 15:52:20 +08:00
commit 296c375092
1 changed files with 41 additions and 13 deletions
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54
client/src/cmdhficlass.c
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@ -2972,7 +2972,7 @@ static int CmdHFiClass_TearBlock(const char *Cmd) {
arg_str0("k", "key", "<hex>", "Access key as 8 hex bytes"),
arg_int0(NULL, "ki", "<dec>", "Key index to select key from memory 'hf iclass managekeys'"),
arg_int1(NULL, "blk", "<dec>", "block number"),
arg_str1("d", "data", "<hex>", "data to write as 8 hex bytes"),
arg_str0("d", "data", "<hex>", "data to write as 8 hex bytes"),
arg_str0("m", "mac", "<hex>", "replay mac data (4 hex bytes)"),
arg_lit0(NULL, "credit", "key is assumed to be the credit key"),
arg_lit0(NULL, "elite", "elite computations applied to key"),
@ -3052,7 +3052,7 @@ static int CmdHFiClass_TearBlock(const char *Cmd) {
}
}
if (data_len != 8) {
if (data_len && data_len != 8) {
PrintAndLogEx(ERR, "Data must be 8 hex bytes (16 hex symbols), got " _RED_("%u"), data_len);
return PM3_EINVARG;
}
@ -3091,7 +3091,7 @@ static int CmdHFiClass_TearBlock(const char *Cmd) {
keyType = ICLASS_CREDIT_KEYTYPE;
}
if (auth == false) {
if (data_len && auth == false) {
PrintAndLogEx(SUCCESS, "No key supplied. Trying no authentication read/writes");
}
@ -3134,10 +3134,12 @@ static int CmdHFiClass_TearBlock(const char *Cmd) {
return PM3_ESOFT;
}
int fail_tolerance = 1;
if (memcmp(r->header.hdr.csn + 4, "\xFE\xFF\x12\xE0", 4) == 0) {
PrintAndLogEx(SUCCESS, "CSN................... %s ( new silicon )", sprint_hex_inrow(r->header.hdr.csn, PICOPASS_BLOCK_SIZE));
} else {
PrintAndLogEx(SUCCESS, "CSN................... %s ( old silicon )", sprint_hex_inrow(r->header.hdr.csn, PICOPASS_BLOCK_SIZE));
fail_tolerance = 5;
}
picopass_hdr_t *hdr = &r->header.hdr;
@ -3161,22 +3163,48 @@ static int CmdHFiClass_TearBlock(const char *Cmd) {
bool reread = false;
bool erase_phase = false;
int res_orig = iclass_read_block_ex(key, blockno, keyType, elite, rawkey, use_replay, verbose, auth, shallow_mod, data_read_orig, false);
if (res_orig == PM3_SUCCESS && !reread) {
if (memcmp(data_read_orig, zeros, 8) == 0) {
reread = true;
} else {
first_read = true;
if (blockno < 3){
read_auth = false;
}
int res_orig = iclass_read_block_ex(key, blockno, keyType, elite, rawkey, use_replay, verbose, read_auth, shallow_mod, data_read_orig, false);
while (reread){
if (res_orig == PM3_SUCCESS && !reread) {
if (memcmp(data_read_orig, zeros, 8) == 0) {
reread = true;
} else {
reread = false;
}
} else if (res_orig == PM3_SUCCESS && reread) {
reread = false;
if (blockno == 2 && memcmp(data_read_orig, zeros, 8) == 0){
reread = true;
}
}
}
if (blockno == 2 && data_len == 0){
int value_index = 0; //assuming FFFFFFFF is on the right
if(memcmp(data_read_orig + 4, "\xFF\xFF\xFF\xFF", 4) != 0){ //FFFFFFFF is on the left
value_index = 4;
}
memcpy(key, iClass_Key_Table[1], PICOPASS_BLOCK_SIZE);
use_credit_key = true;
auth = true;
memcpy(data,data_read_orig,PICOPASS_BLOCK_SIZE);
//decrease the debit epurse value by 1
if(data_read_orig[value_index] != 0x00){
data[value_index]--;
}else{
data[value_index + 2]--;
data[value_index] = 0xFF;
}
} else if (res_orig == PM3_SUCCESS && reread) {
first_read = true;
reread = false;
}
PrintAndLogEx(SUCCESS, "Original block data... " _CYAN_("%s"), sprint_hex_inrow(data_read_orig, sizeof(data_read_orig)));
PrintAndLogEx(SUCCESS, "New data to write..... " _YELLOW_("%s"), sprint_hex_inrow(data, sizeof(data)));
PrintAndLogEx(SUCCESS, "Target block.......... " _YELLOW_("%u") " / " _YELLOW_("0x%02x"), blockno, blockno);
PrintAndLogEx(SUCCESS, "Using Key............. " _YELLOW_("%s"), sprint_hex_inrow(key, sizeof(key)));;
// turn off Device side debug messages
uint8_t dbg_curr = DBG_NONE;
if (getDeviceDebugLevel(&dbg_curr) != PM3_SUCCESS) {
@ -3311,7 +3339,7 @@ static int CmdHFiClass_TearBlock(const char *Cmd) {
readcount++;
}
if (readcount > 1) {
if (readcount > fail_tolerance) {
PrintAndLogEx(WARNING, "\nRead block failed "_RED_("%d") " times", readcount);
}