// the block number for the ISO14443-4 PCB
static uint8_t iso14_pcb_blocknum = 0;
+static uint8_t* free_buffer_pointer;
+
//
// ISO14443 timing:
//
return FALSE; // not finished yet, need more data
}
-
-
//=============================================================================
// ISO 14443 Type A - Manchester decoder
//=============================================================================
// Record the sequence of commands sent by the reader to the tag, with
// triggering so that we start recording at the point that the tag is moved
// near the reader.
+// "hf 14a sniff"
//-----------------------------------------------------------------------------
void RAMFUNC SniffIso14443a(uint8_t param) {
// param:
UartInit(receivedCmd, receivedCmdPar);
// Setup and start DMA.
- FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
+ if ( !FpgaSetupSscDma((uint8_t*) dmaBuf, DMA_BUFFER_SIZE) ){
+ if (MF_DBGLEVEL > 1) Dbprintf("FpgaSetupSscDma failed. Exiting");
+ return;
+ }
// We won't start recording the frames that we acquire until we trigger;
// a good trigger condition to get started is probably when we see a
}
} // main cycle
+ if (MF_DBGLEVEL >= 1) {
+ Dbprintf("maxDataLen=%d, Uart.state=%x, Uart.len=%d", maxDataLen, Uart.state, Uart.len);
+ Dbprintf("traceLen=%d, Uart.output[0]=%08x", BigBuf_get_traceLen(), (uint32_t)Uart.output[0]);
+ }
FpgaDisableSscDma();
- LEDsoff();
-
- Dbprintf("maxDataLen=%d, Uart.state=%x, Uart.len=%d", maxDataLen, Uart.state, Uart.len);
- Dbprintf("traceLen=%d, Uart.output[0]=%08x", BigBuf_get_traceLen(), (uint32_t)Uart.output[0]);
-
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LEDsoff();
set_tracing(FALSE);
}
}
static void Code4bitAnswerAsTag(uint8_t cmd) {
- int i;
uint8_t b = cmd;
ToSendReset();
// Send startbit
ToSend[++ToSendMax] = SEC_D;
- for(i = 0; i < 4; i++) {
+ for(uint8_t i = 0; i < 4; i++) {
if(b & 1) {
ToSend[++ToSendMax] = SEC_D;
LastProxToAirDuration = 8 * ToSendMax - 4;
}
}
-static int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen, bool correctionNeeded);
-int EmSend4bitEx(uint8_t resp, bool correctionNeeded);
-int EmSend4bit(uint8_t resp);
-int EmSendCmdExPar(uint8_t *resp, uint16_t respLen, bool correctionNeeded, uint8_t *par);
-int EmSendCmdEx(uint8_t *resp, uint16_t respLen, bool correctionNeeded);
-int EmSendCmd(uint8_t *resp, uint16_t respLen);
-int EmSendCmdPar(uint8_t *resp, uint16_t respLen, uint8_t *par);
-bool EmLogTrace(uint8_t *reader_data, uint16_t reader_len, uint32_t reader_StartTime, uint32_t reader_EndTime, uint8_t *reader_Parity,
- uint8_t *tag_data, uint16_t tag_len, uint32_t tag_StartTime, uint32_t tag_EndTime, uint8_t *tag_Parity);
-
-static uint8_t* free_buffer_pointer;
-
-typedef struct {
- uint8_t* response;
- size_t response_n;
- uint8_t* modulation;
- size_t modulation_n;
- uint32_t ProxToAirDuration;
-} tag_response_info_t;
-
bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffer_size) {
// Example response, answer to MIFARE Classic read block will be 16 bytes + 2 CRC = 18 bytes
// This will need the following byte array for a modulation sequence
return TRUE;
}
-
// "precompile" responses. There are 7 predefined responses with a total of 28 bytes data to transmit.
// Coded responses need one byte per bit to transfer (data, parity, start, stop, correction)
// 28 * 8 data bits, 28 * 1 parity bits, 7 start bits, 7 stop bits, 7 correction bits
// response to send, and send it.
//-----------------------------------------------------------------------------
void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
- uint32_t counters[] = {0,0,0};
- //Here, we collect UID,NT,AR,NR,UID2,NT2,AR2,NR2
+
+ //Here, we collect CUID, NT, NR, AR, CUID, NT2, NR2, AR2
// This can be used in a reader-only attack.
- // (it can also be retrieved via 'hf 14a list', but hey...
uint32_t ar_nr_responses[] = {0,0,0,0,0,0,0,0,0,0};
uint8_t ar_nr_collected = 0;
+ uint8_t sak = 0;
+ uint32_t cuid = 0;
+ uint32_t nonce = 0;
- uint8_t sak;
-
// PACK response to PWD AUTH for EV1/NTAG
- uint8_t response8[4] = {0,0,0,0};
+ uint8_t response8[4] = {0,0,0,0};
+ // Counter for EV1/NTAG
+ uint32_t counters[] = {0,0,0};
// The first response contains the ATQA (note: bytes are transmitted in reverse order).
- uint8_t response1[2] = {0,0};
+ uint8_t response1[] = {0,0};
switch (tagType) {
- case 1: { // MIFARE Classic
- // Says: I am Mifare 1k - original line
+ case 1: { // MIFARE Classic 1k
response1[0] = 0x04;
- response1[1] = 0x00;
sak = 0x08;
} break;
case 2: { // MIFARE Ultralight
- // Says: I am a stupid memory tag, no crypto
response1[0] = 0x44;
- response1[1] = 0x00;
sak = 0x00;
} break;
case 3: { // MIFARE DESFire
- // Says: I am a DESFire tag, ph33r me
response1[0] = 0x04;
response1[1] = 0x03;
sak = 0x20;
} break;
- case 4: { // ISO/IEC 14443-4
- // Says: I am a javacard (JCOP)
+ case 4: { // ISO/IEC 14443-4 - javacard (JCOP)
response1[0] = 0x04;
- response1[1] = 0x00;
sak = 0x28;
} break;
case 5: { // MIFARE TNP3XXX
- // Says: I am a toy
response1[0] = 0x01;
response1[1] = 0x0f;
sak = 0x01;
} break;
- case 6: { // MIFARE Mini
- // Says: I am a Mifare Mini, 320b
+ case 6: { // MIFARE Mini 320b
response1[0] = 0x44;
- response1[1] = 0x00;
sak = 0x09;
} break;
- case 7: { // NTAG?
- // Says: I am a NTAG,
+ case 7: { // NTAG
response1[0] = 0x44;
- response1[1] = 0x00;
sak = 0x00;
// PACK
response8[0] = 0x80;
// The second response contains the (mandatory) first 24 bits of the UID
uint8_t response2[5] = {0x00};
- // Check if the uid uses the (optional) part
+ // For UID size 7,
uint8_t response2a[5] = {0x00};
- if (flags & FLAG_7B_UID_IN_DATA) {
- response2[0] = 0x88;
+ if ( (flags & FLAG_7B_UID_IN_DATA) == FLAG_7B_UID_IN_DATA ) {
+ response2[0] = 0x88; // Cascade Tag marker
response2[1] = data[0];
response2[2] = data[1];
response2[3] = data[2];
// Configure the ATQA and SAK accordingly
response1[0] |= 0x40;
sak |= 0x04;
+
+ cuid = bytes_to_num(data+3, 4);
} else {
memcpy(response2, data, 4);
- //num_to_bytes(uid_1st,4,response2);
// Configure the ATQA and SAK accordingly
response1[0] &= 0xBF;
sak &= 0xFB;
+ cuid = bytes_to_num(data, 4);
}
// Calculate the BitCountCheck (BCC) for the first 4 bytes of the UID.
response2[4] = response2[0] ^ response2[1] ^ response2[2] ^ response2[3];
// Prepare the mandatory SAK (for 4 and 7 byte UID)
- uint8_t response3[3] = {0x00};
- response3[0] = sak;
+ uint8_t response3[3] = {sak, 0x00, 0x00};
ComputeCrc14443(CRC_14443_A, response3, 1, &response3[1], &response3[2]);
// Prepare the optional second SAK (for 7 byte UID), drop the cascade bit
response3a[0] = sak & 0xFB;
ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
- uint8_t response5[] = { 0x00, 0x00, 0x00, 0x00 }; // Very random tag nonce
- uint8_t response6[] = { 0x04, 0x58, 0x80, 0x02, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS:
+ uint8_t response5[] = { 0x01, 0x01, 0x01, 0x01 }; // Very random tag nonce
+ uint8_t response6[] = { 0x04, 0x58, 0x80, 0x02, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS:
// Format byte = 0x58: FSCI=0x08 (FSC=256), TA(1) and TC(1) present,
// TA(1) = 0x80: different divisors not supported, DR = 1, DS = 1
// TB(1) = not present. Defaults: FWI = 4 (FWT = 256 * 16 * 2^4 * 1/fc = 4833us), SFGI = 0 (SFG = 256 * 16 * 2^0 * 1/fc = 302us)
// TC(1) = 0x02: CID supported, NAD not supported
ComputeCrc14443(CRC_14443_A, response6, 4, &response6[4], &response6[5]);
+ // the randon nonce
+ nonce = bytes_to_num(response5, 4);
+
// Prepare GET_VERSION (different for UL EV-1 / NTAG)
//uint8_t response7_EV1[] = {0x00, 0x04, 0x03, 0x01, 0x01, 0x00, 0x0b, 0x03, 0xfd, 0xf7}; //EV1 48bytes VERSION.
- //uint8_t response7_NTAG[] = {0x00, 0x04, 0x04, 0x02, 0x01, 0x00, 0x11, 0x03, 0x01, 0x9e}; //NTAG 215
-
+ //uint8_t response7_NTAG[] = {0x00, 0x04, 0x04, 0x02, 0x01, 0x00, 0x11, 0x03, 0x01, 0x9e}; //NTAG 215
// Prepare CHK_TEARING
//uint8_t response9[] = {0xBD,0x90,0x3f};
iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
BigBuf_free_keep_EM();
+ clear_trace();
+ set_tracing(TRUE);
// allocate buffers:
uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
uint8_t *receivedCmdPar = BigBuf_malloc(MAX_PARITY_SIZE);
free_buffer_pointer = BigBuf_malloc(ALLOCATED_TAG_MODULATION_BUFFER_SIZE);
- // clear trace
- clear_trace();
- set_tracing(TRUE);
-
// Prepare the responses of the anticollision phase
// there will be not enough time to do this at the moment the reader sends it REQA
for (size_t i=0; i<TAG_RESPONSE_COUNT; i++)
int happened = 0;
int happened2 = 0;
int cmdsRecvd = 0;
-
- cmdsRecvd = 0;
tag_response_info_t* p_response;
LED_A_ON();
- for(;;) {
-
+ for(;;) {
WDT_HIT();
// Clean receive command buffer
DbpString("Button press");
break;
}
-
+
+ // incease nonce at every command recieved
+ nonce++;
+ num_to_bytes(nonce, 4, response5);
+
p_response = NULL;
// Okay, look at the command now.
lastorder = order;
- if(receivedCmd[0] == 0x26) { // Received a REQUEST
+ if(receivedCmd[0] == ISO14443A_CMD_REQA) { // Received a REQUEST
p_response = &responses[0]; order = 1;
- } else if(receivedCmd[0] == 0x52) { // Received a WAKEUP
+ } else if(receivedCmd[0] == ISO14443A_CMD_WUPA) { // Received a WAKEUP
p_response = &responses[0]; order = 6;
- } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x93) { // Received request for UID (cascade 1)
+ } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT) { // Received request for UID (cascade 1)
p_response = &responses[1]; order = 2;
- } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == 0x95) { // Received request for UID (cascade 2)
+ } else if(receivedCmd[1] == 0x20 && receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2) { // Received request for UID (cascade 2)
p_response = &responses[2]; order = 20;
- } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x93) { // Received a SELECT (cascade 1)
+ } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT) { // Received a SELECT (cascade 1)
p_response = &responses[3]; order = 3;
- } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x95) { // Received a SELECT (cascade 2)
- p_response = &responses[4]; order = 30;
- } else if(receivedCmd[0] == 0x30) { // Received a (plain) READ
+ } else if(receivedCmd[1] == 0x70 && receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2) { // Received a SELECT (cascade 2)
+ p_response = &responses[4]; order = 30;
+ } else if(receivedCmd[0] == ISO14443A_CMD_READBLOCK) { // Received a (plain) READ
uint8_t block = receivedCmd[1];
// if Ultralight or NTAG (4 byte blocks)
if ( tagType == 7 || tagType == 2 ) {
// We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below
p_response = NULL;
}
- } else if(receivedCmd[0] == 0x3A) { // Received a FAST READ (ranged read)
+ } else if(receivedCmd[0] == MIFARE_ULEV1_FASTREAD) { // Received a FAST READ (ranged read)
uint8_t emdata[MAX_FRAME_SIZE];
//first 12 blocks of emu are [getversion answer - check tearing - pack - 0x00 - signature]
int start = (receivedCmd[1]+12) * 4;
AppendCrc14443a(emdata, len);
EmSendCmdEx(emdata, len+2, false);
p_response = NULL;
- } else if(receivedCmd[0] == 0x3C && tagType == 7) { // Received a READ SIGNATURE --
+ } else if(receivedCmd[0] == MIFARE_ULEV1_READSIG && tagType == 7) { // Received a READ SIGNATURE --
//first 12 blocks of emu are [getversion answer - check tearing - pack - 0x00 - signature]
uint16_t start = 4 * 4;
uint8_t emdata[34];
AppendCrc14443a(emdata, 32);
EmSendCmdEx(emdata, sizeof(emdata), false);
p_response = NULL;
- } else if (receivedCmd[0] == 0x39 && tagType == 7) { // Received a READ COUNTER --
+ } else if (receivedCmd[0] == MIFARE_ULEV1_READ_CNT && tagType == 7) { // Received a READ COUNTER --
uint8_t index = receivedCmd[1];
uint8_t data[] = {0x00,0x00,0x00,0x14,0xa5};
if ( counters[index] > 0) {
}
EmSendCmdEx(data,sizeof(data),false);
p_response = NULL;
- } else if (receivedCmd[0] == 0xA5 && tagType == 7) { // Received a INC COUNTER --
+ } else if (receivedCmd[0] == MIFARE_ULEV1_INCR_CNT && tagType == 7) { // Received a INC COUNTER --
// number of counter
uint8_t counter = receivedCmd[1];
uint32_t val = bytes_to_num(receivedCmd+2,4);
uint8_t ack[] = {0x0a};
EmSendCmdEx(ack,sizeof(ack),false);
p_response = NULL;
- } else if(receivedCmd[0] == 0x3E && tagType == 7) { // Received a CHECK_TEARING_EVENT --
+ } else if(receivedCmd[0] == MIFARE_ULEV1_CHECKTEAR && tagType == 7) { // Received a CHECK_TEARING_EVENT --
//first 12 blocks of emu are [getversion answer - check tearing - pack - 0x00 - signature]
uint8_t emdata[3];
uint8_t counter=0;
AppendCrc14443a(emdata, sizeof(emdata)-2);
EmSendCmdEx(emdata, sizeof(emdata), false);
p_response = NULL;
- } else if(receivedCmd[0] == 0x50) { // Received a HALT
+ } else if(receivedCmd[0] == ISO14443A_CMD_HALT) { // Received a HALT
LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE);
p_response = NULL;
- } else if(receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61) { // Received an authentication request
-
+ } else if(receivedCmd[0] == MIFARE_AUTH_KEYA || receivedCmd[0] == MIFARE_AUTH_KEYB) { // Received an authentication request
if ( tagType == 7 ) { // IF NTAG /EV1 0x60 == GET_VERSION, not a authentication request.
uint8_t emdata[10];
emlGetMemBt( emdata, 0, 8 );
} else {
p_response = &responses[5]; order = 7;
}
- } else if(receivedCmd[0] == 0xE0) { // Received a RATS request
+ } else if(receivedCmd[0] == ISO14443A_CMD_RATS) { // Received a RATS request
if (tagType == 1 || tagType == 2) { // RATS not supported
EmSend4bit(CARD_NACK_NA);
p_response = NULL;
}
} else if (order == 7 && len == 8) { // Received {nr] and {ar} (part of authentication)
LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE);
- uint32_t nonce = bytes_to_num(response5,4);
uint32_t nr = bytes_to_num(receivedCmd,4);
uint32_t ar = bytes_to_num(receivedCmd+4,4);
- if(flags & FLAG_NR_AR_ATTACK ) {
+ if ( (flags & FLAG_NR_AR_ATTACK) == FLAG_NR_AR_ATTACK ) {
if(ar_nr_collected < 2){
- // Avoid duplicates... probably not necessary, nr should vary.
- //if(ar_nr_responses[3] != nr){
- ar_nr_responses[ar_nr_collected*5] = 0;
- ar_nr_responses[ar_nr_collected*5+1] = 0;
- ar_nr_responses[ar_nr_collected*5+2] = nonce;
- ar_nr_responses[ar_nr_collected*5+3] = nr;
- ar_nr_responses[ar_nr_collected*5+4] = ar;
- ar_nr_collected++;
- //}
+ ar_nr_responses[ar_nr_collected*4] = cuid;
+ ar_nr_responses[ar_nr_collected*4+1] = nonce;
+ ar_nr_responses[ar_nr_collected*4+2] = nr;
+ ar_nr_responses[ar_nr_collected*4+3] = ar;
+ ar_nr_collected++;
}
-
- if(ar_nr_collected > 1 ) {
-
- if (MF_DBGLEVEL >= 2) {
+ if(ar_nr_collected > 1 ) {
+ if (MF_DBGLEVEL >= 2 && !(flags & FLAG_INTERACTIVE)) {
Dbprintf("Collected two pairs of AR/NR which can be used to extract keys from reader:");
- Dbprintf("../tools/mfkey/mfkey32 %07x%08x %08x %08x %08x %08x %08x",
- ar_nr_responses[0], // UID1
- ar_nr_responses[1], // UID2
- ar_nr_responses[2], // NT
- ar_nr_responses[3], // AR1
- ar_nr_responses[4], // NR1
- ar_nr_responses[8], // AR2
- ar_nr_responses[9] // NR2
+ Dbprintf("../tools/mfkey/mfkey32 %08x %08x %08x %08x %08x %08x",
+ ar_nr_responses[0], // CUID
+ ar_nr_responses[1], // NT
+ ar_nr_responses[2], // AR1
+ ar_nr_responses[3], // NR1
+ ar_nr_responses[6], // AR2
+ ar_nr_responses[7] // NR2
);
- Dbprintf("../tools/mfkey/mfkey32v2 %06x%08x %08x %08x %08x %08x %08x %08x",
- ar_nr_responses[0], // UID1
- ar_nr_responses[1], // UID2
- ar_nr_responses[2], // NT1
- ar_nr_responses[3], // AR1
- ar_nr_responses[4], // NR1
- ar_nr_responses[7], // NT2
- ar_nr_responses[8], // AR2
- ar_nr_responses[9] // NR2
- );
}
- uint8_t len = ar_nr_collected*5*4;
- cmd_send(CMD_ACK,CMD_SIMULATE_MIFARE_CARD,len,0,&ar_nr_responses,len);
+ uint8_t len = ar_nr_collected*4*4;
+ cmd_send(CMD_ACK, CMD_SIMULATE_MIFARE_CARD, len, 0, &ar_nr_responses, len);
ar_nr_collected = 0;
memset(ar_nr_responses, 0x00, len);
}
}
- } else if (receivedCmd[0] == 0x1a ) { // ULC authentication
- }
- else if (receivedCmd[0] == 0x1b) { // NTAG / EV-1 authentication
+
+ } else if (receivedCmd[0] == MIFARE_ULC_AUTH_1 ) { // ULC authentication, or Desfire Authentication
+ } else if (receivedCmd[0] == MIFARE_ULEV1_AUTH) { // NTAG / EV-1 authentication
if ( tagType == 7 ) {
uint16_t start = 13; //first 4 blocks of emu are [getversion answer - check tearing - pack - 0x00]
uint8_t emdata[4];
// Count number of other messages after a halt
if(order != 6 && lastorder == 5) { happened2++; }
+ // comment this limit if you want to simulation longer
+ if (!tracing) {
+ Dbprintf("Trace Full. Simulation stopped.");
+ break;
+ }
// comment this limit if you want to simulation longer
if(cmdsRecvd > 999) {
DbpString("1000 commands later...");
(LastTimeProxToAirStart + p_response->ProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG,
par);
}
-
- // comment this limit if you want to simulation longer
- if (!tracing) {
- Dbprintf("Trace Full. Simulation stopped.");
- break;
- }
}
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
}
}
-
// prepare a delayed transfer. This simply shifts ToSend[] by a number
// of bits specified in the delay parameter.
-void PrepareDelayedTransfer(uint16_t delay)
-{
+void PrepareDelayedTransfer(uint16_t delay) {
delay &= 0x07;
if (!delay) return;
// if == 0: transfer immediately and return time of transfer
// if != 0: delay transfer until time specified
//-------------------------------------------------------------------------------------
-static void TransmitFor14443a(const uint8_t *cmd, uint16_t len, uint32_t *timing)
-{
+static void TransmitFor14443a(const uint8_t *cmd, uint16_t len, uint32_t *timing) {
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
uint32_t ThisTransferTime = 0;
NextTransferTime = MAX(NextTransferTime, LastTimeProxToAirStart + REQUEST_GUARD_TIME);
}
-
//-----------------------------------------------------------------------------
// Prepare reader command (in bits, support short frames) to send to FPGA
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// Prepare reader command to send to FPGA
//-----------------------------------------------------------------------------
-void CodeIso14443aAsReaderPar(const uint8_t *cmd, uint16_t len, const uint8_t *parity)
-{
+void CodeIso14443aAsReaderPar(const uint8_t *cmd, uint16_t len, const uint8_t *parity) {
CodeIso14443aBitsAsReaderPar(cmd, len*8, parity);
}
-
//-----------------------------------------------------------------------------
// Wait for commands from reader
// Stop when button is pressed (return 1) or field was gone (return 2)
// Or return 0 when command is captured
//-----------------------------------------------------------------------------
-static int EmGetCmd(uint8_t *received, uint16_t *len, uint8_t *parity)
-{
+static int EmGetCmd(uint8_t *received, uint16_t *len, uint8_t *parity) {
*len = 0;
uint32_t timer = 0, vtime = 0;
return 0;
}
}
-
}
}
-
-static int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen, bool correctionNeeded)
-{
+int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen, bool correctionNeeded) {
uint8_t b;
uint16_t i = 0;
uint32_t ThisTransferTime;
if (Uart.parityBits & 0x01) {
correctionNeeded = TRUE;
}
- if(correctionNeeded) {
- // 1236, so correction bit needed
- i = 0;
- } else {
- i = 1;
- }
+ // 1236, so correction bit needed
+ i = (correctionNeeded) ? 0 : 1;
// clear receiving shift register and holding register
while(!(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY));
i++;
}
}
-
LastTimeProxToAirStart = ThisTransferTime + (correctionNeeded?8:0);
-
return 0;
}
// If a response is captured return TRUE
// If it takes too long return FALSE
//-----------------------------------------------------------------------------
-static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint8_t *receivedResponsePar, uint16_t offset)
-{
+static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint8_t *receivedResponsePar, uint16_t offset) {
uint32_t c = 0x00;
// Set FPGA mode to "reader listen mode", no modulation (listen
}
}
-void ReaderTransmitBitsPar(uint8_t* frame, uint16_t bits, uint8_t *par, uint32_t *timing)
-{
+void ReaderTransmitBitsPar(uint8_t* frame, uint16_t bits, uint8_t *par, uint32_t *timing) {
+
CodeIso14443aBitsAsReaderPar(frame, bits, par);
-
// Send command to tag
TransmitFor14443a(ToSend, ToSendMax, timing);
- if(trigger)
- LED_A_ON();
+ if(trigger) LED_A_ON();
- // Log reader command in trace buffer
- //LogTrace(frame, nbytes(bits), LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_READER, (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_READER, par, TRUE);
LogTrace(frame, nbytes(bits), (LastTimeProxToAirStart<<4) + DELAY_ARM2AIR_AS_READER, ((LastTimeProxToAirStart + LastProxToAirDuration)<<4) + DELAY_ARM2AIR_AS_READER, par, TRUE);
}
-void ReaderTransmitPar(uint8_t* frame, uint16_t len, uint8_t *par, uint32_t *timing)
-{
+void ReaderTransmitPar(uint8_t* frame, uint16_t len, uint8_t *par, uint32_t *timing) {
ReaderTransmitBitsPar(frame, len*8, par, timing);
}
-void ReaderTransmitBits(uint8_t* frame, uint16_t len, uint32_t *timing)
-{
- // Generate parity and redirect
- uint8_t par[MAX_PARITY_SIZE] = {0x00};
- GetParity(frame, len/8, par);
- ReaderTransmitBitsPar(frame, len, par, timing);
+void ReaderTransmitBits(uint8_t* frame, uint16_t len, uint32_t *timing) {
+ // Generate parity and redirect
+ uint8_t par[MAX_PARITY_SIZE] = {0x00};
+ GetParity(frame, len/8, par);
+ ReaderTransmitBitsPar(frame, len, par, timing);
}
-void ReaderTransmit(uint8_t* frame, uint16_t len, uint32_t *timing)
-{
- // Generate parity and redirect
- uint8_t par[MAX_PARITY_SIZE] = {0x00};
- GetParity(frame, len, par);
- ReaderTransmitBitsPar(frame, len*8, par, timing);
+void ReaderTransmit(uint8_t* frame, uint16_t len, uint32_t *timing) {
+ // Generate parity and redirect
+ uint8_t par[MAX_PARITY_SIZE] = {0x00};
+ GetParity(frame, len, par);
+ ReaderTransmitBitsPar(frame, len*8, par, timing);
}
-int ReaderReceiveOffset(uint8_t* receivedAnswer, uint16_t offset, uint8_t *parity)
-{
- if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, offset)) return FALSE;
- //if (tracing) {
- LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE);
- //}
+int ReaderReceiveOffset(uint8_t* receivedAnswer, uint16_t offset, uint8_t *parity) {
+ if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, offset))
+ return FALSE;
+ LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE);
return Demod.len;
}
int ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity) {
- if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, 0)) return FALSE;
- //if (tracing) {
+ if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, 0))
+ return FALSE;
LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE);
- //}
return Demod.len;
}
LEDsoff();
}
-
// Determine the distance between two nonces.
// Assume that the difference is small, but we don't know which is first.
// Therefore try in alternating directions.
uint32_t nttmp1 = nt1;
uint32_t nttmp2 = nt2;
- for (i = 1; i < 32768; ++i) {
- nttmp1 = prng_successor(nttmp1, 1);
- if (nttmp1 == nt2) return i;
- nttmp2 = prng_successor(nttmp2, 1);
- if (nttmp2 == nt1) return -i;
+ for (i = 1; i < (32768/8); ++i) {
+ nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i;
+ nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -i;
+
+ nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i+1;
+ nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+1);
+ nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i+2;
+ nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+2);
+ nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i+3;
+ nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+3);
+ nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i+4;
+ nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+4);
+ nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i+5;
+ nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+5);
+ nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i+6;
+ nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+6);
+ nttmp1 = prng_successor(nttmp1, 1); if (nttmp1 == nt2) return i+7;
+ nttmp2 = prng_successor(nttmp2, 1); if (nttmp2 == nt1) return -(i+7);
}
// either nt1 or nt2 are invalid nonces
return(-99999);
}
-
//-----------------------------------------------------------------------------
// Recover several bits of the cypher stream. This implements (first stages of)
// the algorithm described in "The Dark Side of Security by Obscurity and
// (article by Nicolas T. Courtois, 2009)
//-----------------------------------------------------------------------------
void ReaderMifare(bool first_try, uint8_t block ) {
- // Mifare AUTH
- //uint8_t mf_auth[] = { 0x60,0x00,0xf5,0x7b };
- //uint8_t mf_auth[] = { 0x60,0x05, 0x58, 0x2c };
uint8_t mf_auth[] = { MIFARE_AUTH_KEYA, block, 0x00, 0x00 };
uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
uint8_t uid[10] = {0,0,0,0,0,0,0,0,0,0};
uint16_t unexpected_random = 0;
uint16_t sync_tries = 0;
- // static variables here, is re-used in the next call?
+ // static variables here, is re-used in the next call
static uint32_t nt_attacked = 0;
static uint32_t sync_time = 0;
static uint32_t sync_cycles = 0;
#define PRNG_SEQUENCE_LENGTH (1 << 16)
#define MAX_UNEXPECTED_RANDOM 4 // maximum number of unexpected (i.e. real) random numbers when trying to sync. Then give up.
#define MAX_SYNC_TRIES 32
- #define MAX_STRATEGY 3
BigBuf_free(); BigBuf_Clear_ext(false);
clear_trace();
mf_nr_ar3 = 0;
nt_attacked = 0;
par_low = 0;
-
- Dbprintf("FIRST: sync_time - %08X", sync_time);
} else {
// we were unsuccessful on a previous call.
// Try another READER nonce (first 3 parity bits remain the same)
mf_nr_ar[3] &= 0x1F;
- if (MF_DBGLEVEL >= 1) Dbprintf("\nNumber of sent auth requestes: %u", i);
+ if (MF_DBGLEVEL >= 4) Dbprintf("Number of sent auth requestes: %u", i);
uint8_t buf[28] = {0x00};
memset(buf, 0x00, sizeof(buf));
*MIFARE 1K simulate.
*
*@param flags :
- * FLAG_INTERACTIVE - In interactive mode, we are expected to finish the operation with an ACK
- * 4B_FLAG_UID_IN_DATA - means that there is a 4-byte UID in the data-section, we're expected to use that
- * 7B_FLAG_UID_IN_DATA - means that there is a 7-byte UID in the data-section, we're expected to use that
- * FLAG_NR_AR_ATTACK - means we should collect NR_AR responses for bruteforcing later
+ * FLAG_INTERACTIVE - In interactive mode, we are expected to finish the operation with an ACK
+ * FLAG_4B_UID_IN_DATA - use 4-byte UID in the data-section
+ * FLAG_7B_UID_IN_DATA - use 7-byte UID in the data-section
+ * FLAG_10B_UID_IN_DATA - use 10-byte UID in the data-section
+ * FLAG_UID_IN_EMUL - use 4-byte UID from emulator memory
+ * FLAG_NR_AR_ATTACK - collect NR_AR responses for bruteforcing later
*@param exitAfterNReads, exit simulation after n blocks have been read, 0 is inifite
*/
void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *datain) {
int cardSTATE = MFEMUL_NOFIELD;
- int _7BUID = 0;
+ int _UID_LEN = 0; // 4, 7, 10
int vHf = 0; // in mV
- int res;
+ int res = 0;
uint32_t selTimer = 0;
uint32_t authTimer = 0;
uint16_t len = 0;
uint8_t cardWRBL = 0;
uint8_t cardAUTHSC = 0;
uint8_t cardAUTHKEY = 0xff; // no authentication
-// uint32_t cardRr = 0;
uint32_t cuid = 0;
- //uint32_t rn_enc = 0;
uint32_t ans = 0;
uint32_t cardINTREG = 0;
uint8_t cardINTBLOCK = 0;
struct Crypto1State mpcs = {0, 0};
struct Crypto1State *pcs;
pcs = &mpcs;
- uint32_t numReads = 0;//Counts numer of times reader read a block
+ uint32_t numReads = 0; //Counts numer of times reader read a block
uint8_t receivedCmd[MAX_MIFARE_FRAME_SIZE] = {0x00};
uint8_t receivedCmd_par[MAX_MIFARE_PARITY_SIZE] = {0x00};
uint8_t response[MAX_MIFARE_FRAME_SIZE] = {0x00};
uint8_t response_par[MAX_MIFARE_PARITY_SIZE] = {0x00};
- uint8_t rATQA[] = {0x04, 0x00}; // Mifare classic 1k 4BUID
- uint8_t rUIDBCC1[] = {0xde, 0xad, 0xbe, 0xaf, 0x62};
- uint8_t rUIDBCC2[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; // !!!
- uint8_t rSAK[] = {0x08, 0xb6, 0xdd}; // Mifare Classic
- //uint8_t rSAK[] = {0x09, 0x3f, 0xcc }; // Mifare Mini
- uint8_t rSAK1[] = {0x04, 0xda, 0x17};
-
- //uint8_t rAUTH_NT[] = {0x01, 0x01, 0x01, 0x01};
- uint8_t rAUTH_NT[] = {0x55, 0x41, 0x49, 0x92};
+ uint8_t atqa[] = {0x04, 0x00}; // Mifare classic 1k
+ uint8_t sak_4[] = {0x0C, 0x00, 0x00}; // CL1 - 4b uid
+ uint8_t sak_7[] = {0x0C, 0x00, 0x00}; // CL2 - 7b uid
+ uint8_t sak_10[] = {0x0C, 0x00, 0x00}; // CL3 - 10b uid
+ //uint8_t sak[] = {0x09, 0x3f, 0xcc }; // Mifare Mini
+
+ uint8_t rUIDBCC1[] = {0xde, 0xad, 0xbe, 0xaf, 0x62};
+ uint8_t rUIDBCC2[] = {0xde, 0xad, 0xbe, 0xaf, 0x62};
+ uint8_t rUIDBCC3[] = {0xde, 0xad, 0xbe, 0xaf, 0x62};
+
+ uint8_t rAUTH_NT[] = {0x01, 0x01, 0x01, 0x01}; // very random nonce
+ //uint8_t rAUTH_NT[] = {0x55, 0x41, 0x49, 0x92};// nonce from nested? why this?
uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00};
- //Here, we collect UID1,UID2,NT,AR,NR,0,0,NT2,AR2,NR2
+ // Here, we collect CUID, NT, NR, AR, CUID2, NT2, NR2, AR2
// This can be used in a reader-only attack.
- // (it can also be retrieved via 'hf 14a list', but hey...
- uint32_t ar_nr_responses[] = {0,0,0,0,0,0,0,0,0,0};
+ uint32_t ar_nr_responses[] = {0,0,0,0,0,0,0,0,0};
uint8_t ar_nr_collected = 0;
// Authenticate response - nonce
uint32_t nonce = bytes_to_num(rAUTH_NT, 4);
+ ar_nr_responses[1] = nonce;
//-- Determine the UID
- // Can be set from emulator memory, incoming data
- // and can be 7 or 4 bytes long
- if (flags & FLAG_4B_UID_IN_DATA)
- {
- // 4B uid comes from data-portion of packet
- memcpy(rUIDBCC1,datain,4);
- rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
-
- } else if (flags & FLAG_7B_UID_IN_DATA) {
- // 7B uid comes from data-portion of packet
- memcpy(&rUIDBCC1[1],datain,3);
- memcpy(rUIDBCC2, datain+3, 4);
- _7BUID = true;
- } else {
- // get UID from emul memory
- emlGetMemBt(receivedCmd, 7, 1);
- _7BUID = !(receivedCmd[0] == 0x00);
- if (!_7BUID) { // ---------- 4BUID
- emlGetMemBt(rUIDBCC1, 0, 4);
- } else { // ---------- 7BUID
- emlGetMemBt(&rUIDBCC1[1], 0, 3);
- emlGetMemBt(rUIDBCC2, 3, 4);
- }
- }
-
- // save uid.
- ar_nr_responses[0*5] = bytes_to_num(rUIDBCC1+1, 3);
- if ( _7BUID )
- ar_nr_responses[0*5+1] = bytes_to_num(rUIDBCC2, 4);
-
- /*
- * Regardless of what method was used to set the UID, set fifth byte and modify
- * the ATQA for 4 or 7-byte UID
- */
- rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
- if (_7BUID) {
- rATQA[0] = 0x44;
- rUIDBCC1[0] = 0x88;
- rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
- rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3];
+ // Can be set from emulator memory or incoming data
+ // Length: 4,7,or 10 bytes
+ if ( (flags & FLAG_UID_IN_EMUL) == FLAG_UID_IN_EMUL)
+ emlGetMemBt(datain, 0, 10); // load 10bytes from EMUL to the datain pointer. to be used below.
+
+ if ( (flags & FLAG_4B_UID_IN_DATA) == FLAG_4B_UID_IN_DATA) {
+ memcpy(rUIDBCC1, datain, 4);
+ _UID_LEN = 4;
+ } else if ( (flags & FLAG_7B_UID_IN_DATA) == FLAG_7B_UID_IN_DATA) {
+ memcpy(&rUIDBCC1[1], datain, 3);
+ memcpy( rUIDBCC2, datain+3, 4);
+ _UID_LEN = 7;
+ } else if ( (flags & FLAG_10B_UID_IN_DATA) == FLAG_10B_UID_IN_DATA) {
+ memcpy(&rUIDBCC1[1], datain, 3);
+ memcpy(&rUIDBCC2[1], datain+3, 3);
+ memcpy( rUIDBCC3, datain+6, 4);
+ _UID_LEN = 10;
}
- if (MF_DBGLEVEL >= 1) {
- if (!_7BUID) {
- Dbprintf("4B UID: %02x%02x%02x%02x",
- rUIDBCC1[0], rUIDBCC1[1], rUIDBCC1[2], rUIDBCC1[3]);
- } else {
- Dbprintf("7B UID: (%02x)%02x%02x%02x%02x%02x%02x%02x",
- rUIDBCC1[0], rUIDBCC1[1], rUIDBCC1[2], rUIDBCC1[3],
- rUIDBCC2[0], rUIDBCC2[1] ,rUIDBCC2[2], rUIDBCC2[3]);
- }
+ switch (_UID_LEN) {
+ case 4:
+ sak_4[0] &= 0xFB;
+ // save CUID
+ ar_nr_responses[0] = cuid = bytes_to_num(rUIDBCC1, 4);
+ // BCC
+ rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
+ if (MF_DBGLEVEL >= 2) {
+ Dbprintf("4B UID: %02x%02x%02x%02x",
+ rUIDBCC1[0],
+ rUIDBCC1[1],
+ rUIDBCC1[2],
+ rUIDBCC1[3]
+ );
+ }
+ break;
+ case 7:
+ atqa[0] |= 0x40;
+ sak_7[0] &= 0xFB;
+ // save CUID
+ ar_nr_responses[0] = cuid = bytes_to_num(rUIDBCC2, 4);
+ // CascadeTag, CT
+ rUIDBCC1[0] = 0x88;
+ // BCC
+ rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
+ rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3];
+ if (MF_DBGLEVEL >= 2) {
+ Dbprintf("7B UID: %02x %02x %02x %02x %02x %02x %02x",
+ rUIDBCC1[1],
+ rUIDBCC1[2],
+ rUIDBCC1[3],
+ rUIDBCC2[0],
+ rUIDBCC2[1],
+ rUIDBCC2[2],
+ rUIDBCC2[3]
+ );
+ }
+ break;
+ case 10:
+ atqa[0] |= 0x80;
+ sak_10[0] &= 0xFB;
+ // save CUID
+ ar_nr_responses[0] = cuid = bytes_to_num(rUIDBCC3, 4);
+ // CascadeTag, CT
+ rUIDBCC1[0] = 0x88;
+ rUIDBCC2[0] = 0x88;
+ // BCC
+ rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
+ rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3];
+ rUIDBCC3[4] = rUIDBCC3[0] ^ rUIDBCC3[1] ^ rUIDBCC3[2] ^ rUIDBCC3[3];
+
+ if (MF_DBGLEVEL >= 2) {
+ Dbprintf("10B UID: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
+ rUIDBCC1[1],
+ rUIDBCC1[2],
+ rUIDBCC1[3],
+ rUIDBCC2[1],
+ rUIDBCC2[2],
+ rUIDBCC2[3],
+ rUIDBCC3[0],
+ rUIDBCC3[1],
+ rUIDBCC3[2],
+ rUIDBCC3[3]
+ );
+ }
+ break;
+ default:
+ break;
}
-
+ // calc some crcs
+ ComputeCrc14443(CRC_14443_A, sak_4, 1, &sak_4[1], &sak_4[2]);
+ ComputeCrc14443(CRC_14443_A, sak_7, 1, &sak_7[1], &sak_7[2]);
+ ComputeCrc14443(CRC_14443_A, sak_10, 1, &sak_10[1], &sak_10[2]);
+
// We need to listen to the high-frequency, peak-detected path.
iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
// free eventually allocated BigBuf memory but keep Emulator Memory
BigBuf_free_keep_EM();
-
- // clear trace
clear_trace();
set_tracing(TRUE);
-
bool finished = FALSE;
while (!BUTTON_PRESS() && !finished && !usb_poll_validate_length()) {
WDT_HIT();
LED_A_ON();
}
}
- if(cardSTATE == MFEMUL_NOFIELD) continue;
+ if (cardSTATE == MFEMUL_NOFIELD) continue;
//Now, get data
res = EmGetCmd(receivedCmd, &len, receivedCmd_par);
}
// REQ or WUP request in ANY state and WUP in HALTED state
- if (len == 1 && ((receivedCmd[0] == 0x26 && cardSTATE != MFEMUL_HALTED) || receivedCmd[0] == 0x52)) {
+ // this if-statement doesn't match the specification above. (iceman)
+ if (len == 1 && ((receivedCmd[0] == ISO14443A_CMD_REQA && cardSTATE != MFEMUL_HALTED) || receivedCmd[0] == ISO14443A_CMD_WUPA)) {
selTimer = GetTickCount();
- EmSendCmdEx(rATQA, sizeof(rATQA), (receivedCmd[0] == 0x52));
+ EmSendCmdEx(atqa, sizeof(atqa), (receivedCmd[0] == ISO14443A_CMD_WUPA));
cardSTATE = MFEMUL_SELECT1;
-
- // init crypto block
- LED_B_OFF();
- LED_C_OFF();
crypto1_destroy(pcs);
cardAUTHKEY = 0xff;
+ LEDsoff();
+ nonce++;
continue;
}
break;
}
case MFEMUL_SELECT1:{
- // select all
- if (len == 2 && (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x20)) {
+ if (len == 2 && (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && receivedCmd[1] == 0x20)) {
if (MF_DBGLEVEL >= 4) Dbprintf("SELECT ALL received");
EmSendCmd(rUIDBCC1, sizeof(rUIDBCC1));
break;
}
-
- if (MF_DBGLEVEL >= 4 && len == 9 && receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70 )
- {
- Dbprintf("SELECT %02x%02x%02x%02x received",receivedCmd[2],receivedCmd[3],receivedCmd[4],receivedCmd[5]);
- }
// select card
if (len == 9 &&
- (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC1, 4) == 0)) {
- EmSendCmd(_7BUID?rSAK1:rSAK, _7BUID?sizeof(rSAK1):sizeof(rSAK));
- cuid = bytes_to_num(rUIDBCC1, 4);
- if (!_7BUID) {
- cardSTATE = MFEMUL_WORK;
- LED_B_ON();
- if (MF_DBGLEVEL >= 4) Dbprintf("--> WORK. anticol1 time: %d", GetTickCount() - selTimer);
- break;
- } else {
- cardSTATE = MFEMUL_SELECT2;
+ ( receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT &&
+ receivedCmd[1] == 0x70 &&
+ memcmp(&receivedCmd[2], rUIDBCC1, 4) == 0)) {
+
+ // SAK 4b
+ EmSendCmd(sak_4, sizeof(sak_4));
+ switch(_UID_LEN){
+ case 4:
+ cardSTATE = MFEMUL_WORK;
+ LED_B_ON();
+ if (MF_DBGLEVEL >= 4) Dbprintf("--> WORK. anticol1 time: %d", GetTickCount() - selTimer);
+ continue;
+ case 7:
+ case 10:
+ cardSTATE = MFEMUL_SELECT2;
+ continue;
+ default:break;
}
+ } else {
+ cardSTATE_TO_IDLE();
+ }
+ break;
+ }
+ case MFEMUL_SELECT2:{
+ if (!len) {
+ LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE);
+ break;
+ }
+ if (len == 2 && (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && receivedCmd[1] == 0x20)) {
+ EmSendCmd(rUIDBCC2, sizeof(rUIDBCC2));
+ break;
+ }
+ if (len == 9 &&
+ (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 &&
+ receivedCmd[1] == 0x70 &&
+ memcmp(&receivedCmd[2], rUIDBCC2, 4) == 0) ) {
+
+ EmSendCmd(sak_7, sizeof(sak_7));
+ switch(_UID_LEN){
+ case 7:
+ cardSTATE = MFEMUL_WORK;
+ LED_B_ON();
+ if (MF_DBGLEVEL >= 4) Dbprintf("--> WORK. anticol2 time: %d", GetTickCount() - selTimer);
+ continue;
+ case 10:
+ cardSTATE = MFEMUL_SELECT3;
+ continue;
+ default:break;
+ }
+ }
+ cardSTATE_TO_IDLE();
+ break;
+ }
+ case MFEMUL_SELECT3:{
+ if (!len) {
+ LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE);
+ break;
+ }
+ if (len == 2 && (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_3 && receivedCmd[1] == 0x20)) {
+ EmSendCmd(rUIDBCC3, sizeof(rUIDBCC3));
+ break;
+ }
+ if (len == 9 &&
+ (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_3 &&
+ receivedCmd[1] == 0x70 &&
+ memcmp(&receivedCmd[2], rUIDBCC3, 4) == 0) ) {
+
+ EmSendCmd(sak_10, sizeof(sak_10));
+ cardSTATE = MFEMUL_WORK;
+ LED_B_ON();
+ if (MF_DBGLEVEL >= 4) Dbprintf("--> WORK. anticol3 time: %d", GetTickCount() - selTimer);
+ break;
}
+ cardSTATE_TO_IDLE();
break;
}
case MFEMUL_AUTH1:{
break;
}
- uint32_t ar = bytes_to_num(receivedCmd, 4);
- uint32_t nr = bytes_to_num(&receivedCmd[4], 4);
+ uint32_t nr = bytes_to_num(receivedCmd, 4);
+ uint32_t ar = bytes_to_num(&receivedCmd[4], 4);
//Collect AR/NR
//if(ar_nr_collected < 2 && cardAUTHSC == 2){
- if(ar_nr_collected < 2) {
- if(ar_nr_responses[2] != ar) {
- // Avoid duplicates... probably not necessary, ar should vary.
- //ar_nr_responses[ar_nr_collected*5] = 0;
- //ar_nr_responses[ar_nr_collected*5+1] = 0;
- ar_nr_responses[ar_nr_collected*5+2] = nonce;
- ar_nr_responses[ar_nr_collected*5+3] = nr;
- ar_nr_responses[ar_nr_collected*5+4] = ar;
+ if(ar_nr_collected < 2) {
+ //if(ar_nr_responses[2] != nr) {
+ ar_nr_responses[ar_nr_collected*4] = cuid;
+ ar_nr_responses[ar_nr_collected*4+1] = nonce;
+ ar_nr_responses[ar_nr_collected*4+2] = nr;
+ ar_nr_responses[ar_nr_collected*4+3] = ar;
ar_nr_collected++;
- }
+ //}
+
// Interactive mode flag, means we need to send ACK
- if(flags & FLAG_INTERACTIVE && ar_nr_collected == 2)
- finished = true;
+ finished = ( ((flags & FLAG_INTERACTIVE) == FLAG_INTERACTIVE)&& ar_nr_collected == 2);
}
-
- // --- crypto
- //crypto1_word(pcs, ar , 1);
- //cardRr = nr ^ crypto1_word(pcs, 0, 0);
-
- //test if auth OK
- //if (cardRr != prng_successor(nonce, 64)){
+ /*
+ crypto1_word(pcs, ar , 1);
+ cardRr = nr ^ crypto1_word(pcs, 0, 0);
+
+ test if auth OK
+ if (cardRr != prng_successor(nonce, 64)){
- //if (MF_DBGLEVEL >= 4) Dbprintf("AUTH FAILED for sector %d with key %c. cardRr=%08x, succ=%08x",
- // cardAUTHSC, cardAUTHKEY == 0 ? 'A' : 'B',
- // cardRr, prng_successor(nonce, 64));
- // Shouldn't we respond anything here?
- // Right now, we don't nack or anything, which causes the
- // reader to do a WUPA after a while. /Martin
- // -- which is the correct response. /piwi
- //cardSTATE_TO_IDLE();
- //LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE);
- //break;
- //}
-
+ if (MF_DBGLEVEL >= 4) Dbprintf("AUTH FAILED for sector %d with key %c. cardRr=%08x, succ=%08x",
+ cardAUTHSC, cardAUTHKEY == 0 ? 'A' : 'B',
+ cardRr, prng_successor(nonce, 64));
+ Shouldn't we respond anything here?
+ Right now, we don't nack or anything, which causes the
+ reader to do a WUPA after a while. /Martin
+ -- which is the correct response. /piwi
+ cardSTATE_TO_IDLE();
+ LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE);
+ break;
+ }
+ */
+
ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0);
-
num_to_bytes(ans, 4, rAUTH_AT);
- // --- crypto
EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
LED_C_ON();
- cardSTATE = MFEMUL_WORK;
+
if (MF_DBGLEVEL >= 4) {
Dbprintf("AUTH COMPLETED for sector %d with key %c. time=%d",
cardAUTHSC,
GetTickCount() - authTimer
);
}
- break;
- }
- case MFEMUL_SELECT2:{
- if (!len) {
- LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE);
- break;
- }
- if (len == 2 && (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x20)) {
- EmSendCmd(rUIDBCC2, sizeof(rUIDBCC2));
- break;
- }
-
- // select 2 card
- if (len == 9 &&
- (receivedCmd[0] == 0x95 &&
- receivedCmd[1] == 0x70 &&
- memcmp(&receivedCmd[2], rUIDBCC2, 4) == 0) ) {
- EmSendCmd(rSAK, sizeof(rSAK));
- cuid = bytes_to_num(rUIDBCC2, 4);
- cardSTATE = MFEMUL_WORK;
- LED_B_ON();
- if (MF_DBGLEVEL >= 4) Dbprintf("--> WORK. anticol2 time: %d", GetTickCount() - selTimer);
- break;
- }
-
- // i guess there is a command). go into the work state.
- if (len != 4) {
- LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE);
- break;
- }
cardSTATE = MFEMUL_WORK;
- //goto lbWORK;
- //intentional fall-through to the next case-stmt
+ break;
}
-
case MFEMUL_WORK:{
if (len == 0) {
LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE);
break;
- }
-
+ }
bool encrypted_data = (cardAUTHKEY != 0xFF) ;
- // decrypt seqence
if(encrypted_data)
mf_crypto1_decrypt(pcs, receivedCmd, len);
- if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) {
+ if (len == 4 && (receivedCmd[0] == MIFARE_AUTH_KEYA ||
+ receivedCmd[0] == MIFARE_AUTH_KEYB) ) {
+
authTimer = GetTickCount();
cardAUTHSC = receivedCmd[1] / 4; // received block num
- cardAUTHKEY = receivedCmd[0] - 0x60;
- crypto1_destroy(pcs);//Added by martin
+ cardAUTHKEY = receivedCmd[0] - 0x60; // & 1
+ crypto1_destroy(pcs);
crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY));
- if (!encrypted_data) { // first authentication
- if (MF_DBGLEVEL >= 4) Dbprintf("Reader authenticating for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY );
-
+ if (!encrypted_data) {
+ // first authentication
crypto1_word(pcs, cuid ^ nonce, 0);//Update crypto state
num_to_bytes(nonce, 4, rAUTH_AT); // Send nonce
- } else { // nested authentication
- if (MF_DBGLEVEL >= 4) Dbprintf("Reader doing nested authentication for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY );
+
+ if (MF_DBGLEVEL >= 4) Dbprintf("Reader authenticating for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY );
+
+ } else {
+ // nested authentication
ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0);
num_to_bytes(ans, 4, rAUTH_AT);
+
+ if (MF_DBGLEVEL >= 4) Dbprintf("Reader doing nested authentication for block %d (0x%02x) with key %d",receivedCmd[1] ,receivedCmd[1],cardAUTHKEY );
}
EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
- //Dbprintf("Sending rAUTH %02x%02x%02x%02x", rAUTH_AT[0],rAUTH_AT[1],rAUTH_AT[2],rAUTH_AT[3]);
cardSTATE = MFEMUL_AUTH1;
break;
}
break;
}
- if(receivedCmd[0] == 0x30 // read block
- || receivedCmd[0] == 0xA0 // write block
- || receivedCmd[0] == 0xC0 // inc
- || receivedCmd[0] == 0xC1 // dec
- || receivedCmd[0] == 0xC2 // restore
- || receivedCmd[0] == 0xB0) { // transfer
+ if ( receivedCmd[0] == ISO14443A_CMD_READBLOCK ||
+ receivedCmd[0] == ISO14443A_CMD_WRITEBLOCK ||
+ receivedCmd[0] == MIFARE_CMD_INC ||
+ receivedCmd[0] == MIFARE_CMD_DEC ||
+ receivedCmd[0] == MIFARE_CMD_RESTORE ||
+ receivedCmd[0] == MIFARE_CMD_TRANSFER ) {
+
if (receivedCmd[1] >= 16 * 4) {
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
if (MF_DBGLEVEL >= 4) Dbprintf("Reader tried to operate (0x%02) on out of range block: %d (0x%02x), nacking",receivedCmd[0],receivedCmd[1],receivedCmd[1]);
}
}
// read block
- if (receivedCmd[0] == 0x30) {
- if (MF_DBGLEVEL >= 4) Dbprintf("Reader reading block %d (0x%02x)",receivedCmd[1],receivedCmd[1]);
+ if (receivedCmd[0] == ISO14443A_CMD_READBLOCK) {
+ if (MF_DBGLEVEL >= 4) Dbprintf("Reader reading block %d (0x%02x)", receivedCmd[1], receivedCmd[1]);
emlGetMem(response, receivedCmd[1], 1);
AppendCrc14443a(response, 16);
break;
}
// write block
- if (receivedCmd[0] == 0xA0) {
- if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0xA0 write block %d (%02x)",receivedCmd[1],receivedCmd[1]);
+ if (receivedCmd[0] == ISO14443A_CMD_WRITEBLOCK) {
+ if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0xA0 write block %d (%02x)", receivedCmd[1], receivedCmd[1]);
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
cardSTATE = MFEMUL_WRITEBL2;
cardWRBL = receivedCmd[1];
break;
}
// increment, decrement, restore
- if (receivedCmd[0] == 0xC0 || receivedCmd[0] == 0xC1 || receivedCmd[0] == 0xC2) {
- if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x inc(0xC1)/dec(0xC0)/restore(0xC2) block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]);
+ if ( receivedCmd[0] == MIFARE_CMD_INC ||
+ receivedCmd[0] == MIFARE_CMD_DEC ||
+ receivedCmd[0] == MIFARE_CMD_RESTORE) {
+
+ if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x inc(0xC1)/dec(0xC0)/restore(0xC2) block %d (%02x)",receivedCmd[0], receivedCmd[1], receivedCmd[1]);
+
if (emlCheckValBl(receivedCmd[1])) {
if (MF_DBGLEVEL >= 4) Dbprintf("Reader tried to operate on block, but emlCheckValBl failed, nacking");
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
break;
}
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
- if (receivedCmd[0] == 0xC1)
- cardSTATE = MFEMUL_INTREG_INC;
- if (receivedCmd[0] == 0xC0)
- cardSTATE = MFEMUL_INTREG_DEC;
- if (receivedCmd[0] == 0xC2)
- cardSTATE = MFEMUL_INTREG_REST;
+ if (receivedCmd[0] == MIFARE_CMD_INC) cardSTATE = MFEMUL_INTREG_INC;
+ if (receivedCmd[0] == MIFARE_CMD_DEC) cardSTATE = MFEMUL_INTREG_DEC;
+ if (receivedCmd[0] == MIFARE_CMD_RESTORE) cardSTATE = MFEMUL_INTREG_REST;
cardWRBL = receivedCmd[1];
break;
}
// transfer
- if (receivedCmd[0] == 0xB0) {
- if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x transfer block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]);
+ if (receivedCmd[0] == MIFARE_CMD_TRANSFER) {
+ if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x transfer block %d (%02x)", receivedCmd[0], receivedCmd[1], receivedCmd[1]);
if (emlSetValBl(cardINTREG, cardINTBLOCK, receivedCmd[1]))
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
else
break;
}
// halt
- if (receivedCmd[0] == 0x50 && receivedCmd[1] == 0x00) {
+ if (receivedCmd[0] == ISO14443A_CMD_HALT && receivedCmd[1] == 0x00) {
LED_B_OFF();
LED_C_OFF();
cardSTATE = MFEMUL_HALTED;
break;
}
// RATS
- if (receivedCmd[0] == 0xe0) {//RATS
+ if (receivedCmd[0] == ISO14443A_CMD_RATS) {
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
break;
}
}
break;
}
-
case MFEMUL_INTREG_INC:{
mf_crypto1_decrypt(pcs, receivedCmd, len);
memcpy(&ans, receivedCmd, 4);
}
// Interactive mode flag, means we need to send ACK
- if(flags & FLAG_INTERACTIVE) {
+ if((flags & FLAG_INTERACTIVE) == FLAG_INTERACTIVE) {
//May just aswell send the collected ar_nr in the response aswell
- uint8_t len = ar_nr_collected*5*4;
+ uint8_t len = ar_nr_collected * 4 * 4;
cmd_send(CMD_ACK, CMD_SIMULATE_MIFARE_CARD, len, 0, &ar_nr_responses, len);
}
- if(flags & FLAG_NR_AR_ATTACK && MF_DBGLEVEL >= 1 ) {
+ if( ((flags & FLAG_NR_AR_ATTACK) == FLAG_NR_AR_ATTACK ) && MF_DBGLEVEL >= 1 ) {
if(ar_nr_collected > 1 ) {
Dbprintf("Collected two pairs of AR/NR which can be used to extract keys from reader:");
- Dbprintf("../tools/mfkey/mfkey32 %06x%08x %08x %08x %08x %08x %08x",
- ar_nr_responses[0], // UID1
- ar_nr_responses[1], // UID2
- ar_nr_responses[2], // NT
+ Dbprintf("../tools/mfkey/mfkey32v2.exe %08x %08x %08x %08x %08x %08x %08x",
+ ar_nr_responses[0], // CUID
+ ar_nr_responses[1], // NT1
+ ar_nr_responses[2], // NR1
ar_nr_responses[3], // AR1
- ar_nr_responses[4], // NR1
- ar_nr_responses[8], // AR2
- ar_nr_responses[9] // NR2
- );
- Dbprintf("../tools/mfkey/mfkey32v2 %06x%08x %08x %08x %08x %08x %08x %08x",
- ar_nr_responses[0], // UID1
- ar_nr_responses[1], // UID2
- ar_nr_responses[2], // NT1
- ar_nr_responses[3], // AR1
- ar_nr_responses[4], // NR1
- ar_nr_responses[7], // NT2
- ar_nr_responses[8], // AR2
- ar_nr_responses[9] // NR2
- );
+ //ar_nr_responses[4], // CUID2
+ ar_nr_responses[5], // NT2
+ ar_nr_responses[6], // NR2
+ ar_nr_responses[7] // AR2
+ );
} else {
Dbprintf("Failed to obtain two AR/NR pairs!");
- if(ar_nr_collected > 0 ) {
- Dbprintf("Only got these: UID=%06x%08x, nonce=%08x, AR1=%08x, NR1=%08x",
- ar_nr_responses[0], // UID1
- ar_nr_responses[1], // UID2
- ar_nr_responses[2], // NT
- ar_nr_responses[3], // AR1
- ar_nr_responses[4] // NR1
- );
+ if(ar_nr_collected == 1 ) {
+ Dbprintf("Only got these: UID=%08x, nonce=%08x, NR1=%08x, AR1=%08x",
+ ar_nr_responses[0], // CUID
+ ar_nr_responses[1], // NT
+ ar_nr_responses[2], // NR1
+ ar_nr_responses[3] // AR1
+ );
}
}
}
- if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, BigBuf_get_traceLen());
+ if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, BigBuf_get_traceLen());
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
LEDsoff();
//-----------------------------------------------------------------------------
// MIFARE sniffer.
//
+// if no activity for 2sec, it sends the collected data to the client.
//-----------------------------------------------------------------------------
+// "hf mf sniff"
void RAMFUNC SniffMifare(uint8_t param) {
- // param:
- // bit 0 - trigger from first card answer
- // bit 1 - trigger from first reader 7-bit request
+
LEDsoff();
// free eventually allocated BigBuf memory
iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER);
// allocate the DMA buffer, used to stream samples from the FPGA
+ // [iceman] is this sniffed data unsigned?
uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
uint8_t *data = dmaBuf;
uint8_t previous_data = 0;
// Set up the demodulator for the reader -> tag commands
UartInit(receivedCmd, receivedCmdPar);
- // Setup for the DMA.
- FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); // set transfer address and number of bytes. Start transfer.
+ // Setup and start DMA.
+ // set transfer address and number of bytes. Start transfer.
+ if ( !FpgaSetupSscDma((uint8_t*) dmaBuf, DMA_BUFFER_SIZE) ){
+ if (MF_DBGLEVEL > 1) Dbprintf("FpgaSetupSscDma failed. Exiting");
+ return;
+ }
LED_D_OFF();
-
- // init sniffer
+
MfSniffInit();
// And now we loop, receiving samples.
- for(uint32_t sniffCounter = 0; TRUE; ) {
+ for(uint32_t sniffCounter = 0;; ) {
LED_A_ON();
WDT_HIT();
maxDataLen = 0;
ReaderIsActive = FALSE;
TagIsActive = FALSE;
- FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE); // set transfer address and number of bytes. Start transfer.
+ // Setup and start DMA. set transfer address and number of bytes. Start transfer.
+ if ( !FpgaSetupSscDma((uint8_t*) dmaBuf, DMA_BUFFER_SIZE) ){
+ if (MF_DBGLEVEL > 1) Dbprintf("FpgaSetupSscDma failed. Exiting");
+ return;
+ }
}
}
data = dmaBuf;
} // main cycle
-
+
+ if (MF_DBGLEVEL >= 1) Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.len=%x", maxDataLen, Uart.state, Uart.len);
+
FpgaDisableSscDma();
MfSniffEnd();
- Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.len=%x", maxDataLen, Uart.state, Uart.len);
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
LEDsoff();
set_tracing(FALSE);
projects / proxmark3-svn / blobdiff