#define DELAY_FPGA_QUEUE (FpgaSendQueueDelay<<1)
// When the PM acts as tag and is sending, it takes
-// 4*16 ticks until we can write data to the sending hold register
+// 4*16 + 8 ticks until we can write data to the sending hold register
// 8*16 ticks until the SHR is transferred to the Sending Shift Register
-// 8 ticks until the first transfer starts
-// 8 ticks later the FPGA samples the data
-// + a varying number of ticks in the FPGA Delay Queue (mod_sig_buf)
+// 8 ticks later the FPGA samples the first data
+// + 16 ticks until assigned to mod_sig
// + 1 tick to assign mod_sig_coil
-#define DELAY_ARM2AIR_AS_TAG (4*16 + 8*16 + 8 + 8 + DELAY_FPGA_QUEUE + 1)
+// + a varying number of ticks in the FPGA Delay Queue (mod_sig_buf)
+#define DELAY_ARM2AIR_AS_TAG (4*16 + 8 + 8*16 + 8 + 16 + 1 + DELAY_FPGA_QUEUE)
// When the PM acts as sniffer and is receiving tag data, it takes
// 3 ticks A/D conversion
}
-void iso14a_set_timeout(uint32_t timeout) {
+static void iso14a_set_timeout(uint32_t timeout) {
iso14a_timeout = timeout;
if(MF_DBGLEVEL >= 3) Dbprintf("ISO14443A Timeout set to %ld (%dms)", iso14a_timeout, iso14a_timeout / 106);
}
-void iso14a_set_ATS_timeout(uint8_t *ats) {
+static void iso14a_set_ATS_timeout(uint8_t *ats) {
uint8_t tb1;
uint8_t fwi;
ComputeCrc14443(CRC_14443_A,data,len,data+len,data+len+1);
}
-void AppendCrc14443b(uint8_t* data, int len)
+static void AppendCrc14443b(uint8_t* data, int len)
{
ComputeCrc14443(CRC_14443_B,data,len,data+len,data+len+1);
}
#define IsMillerModulationNibble1(b) (Mod_Miller_LUT[(b & 0x000000F0) >> 4])
#define IsMillerModulationNibble2(b) (Mod_Miller_LUT[(b & 0x0000000F)])
-void UartReset()
+static void UartReset()
{
Uart.state = STATE_UNSYNCD;
Uart.bitCount = 0;
Uart.endTime = 0;
}
-void UartInit(uint8_t *data, uint8_t *parity)
+static void UartInit(uint8_t *data, uint8_t *parity)
{
Uart.output = data;
Uart.parity = parity;
#define IsManchesterModulationNibble2(b) (Mod_Manchester_LUT[(b & 0x000F)])
-void DemodReset()
+static void DemodReset()
{
Demod.state = DEMOD_UNSYNCD;
Demod.len = 0; // number of decoded data bytes
Demod.endTime = 0;
}
-void DemodInit(uint8_t *data, uint8_t *parity)
+static void DemodInit(uint8_t *data, uint8_t *parity)
{
Demod.output = data;
Demod.parity = parity;
ToSendMax++;
}
-static void CodeIso14443aAsTag(const uint8_t *cmd, uint16_t len)
-{
- uint8_t par[MAX_PARITY_SIZE];
-
- GetParity(cmd, len, par);
- CodeIso14443aAsTagPar(cmd, len, par);
-}
-
static void Code4bitAnswerAsTag(uint8_t cmd)
{
ToSendMax++;
}
+
+static uint8_t *LastReaderTraceTime = NULL;
+
+static void EmLogTraceReader(void) {
+ // remember last reader trace start to fix timing info later
+ LastReaderTraceTime = BigBuf_get_addr() + BigBuf_get_traceLen();
+ LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, true);
+}
+
+
+static void FixLastReaderTraceTime(uint32_t tag_StartTime) {
+ uint32_t reader_EndTime = Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG;
+ uint32_t reader_StartTime = Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG;
+ uint16_t reader_modlen = reader_EndTime - reader_StartTime;
+ uint16_t approx_fdt = tag_StartTime - reader_EndTime;
+ uint16_t exact_fdt = (approx_fdt - 20 + 32)/64 * 64 + 20;
+ reader_StartTime = tag_StartTime - exact_fdt - reader_modlen;
+ LastReaderTraceTime[0] = (reader_StartTime >> 0) & 0xff;
+ LastReaderTraceTime[1] = (reader_StartTime >> 8) & 0xff;
+ LastReaderTraceTime[2] = (reader_StartTime >> 16) & 0xff;
+ LastReaderTraceTime[3] = (reader_StartTime >> 24) & 0xff;
+}
+
+
+static void EmLogTraceTag(uint8_t *tag_data, uint16_t tag_len, uint8_t *tag_Parity, uint32_t ProxToAirDuration) {
+ uint32_t tag_StartTime = LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG;
+ uint32_t tag_EndTime = (LastTimeProxToAirStart + ProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG;
+ LogTrace(tag_data, tag_len, tag_StartTime, tag_EndTime, tag_Parity, false);
+ FixLastReaderTraceTime(tag_StartTime);
+}
+
+
//-----------------------------------------------------------------------------
// Wait for commands from reader
// Stop when button is pressed
b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
if(MillerDecoding(b, 0)) {
*len = Uart.len;
+ EmLogTraceReader();
return true;
}
}
}
}
-static int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen, bool correctionNeeded);
-int EmSend4bitEx(uint8_t resp, bool correctionNeeded);
+
+static 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);
+static 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);
+int EmSendPrecompiledCmd(tag_response_info_t *response_info, bool correctionNeeded);
-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) {
+static 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
// 144 data bits (18 * 8)
// Prepare the tag modulation bits from the message
- CodeIso14443aAsTag(response_info->response,response_info->response_n);
+ GetParity(response_info->response, response_info->response_n, &(response_info->par));
+ CodeIso14443aAsTagPar(response_info->response,response_info->response_n, &(response_info->par));
// Make sure we do not exceed the free buffer space
if (ToSendMax > max_buffer_size) {
Dbprintf("Out of memory, when modulating bits for tag answer:");
- Dbhexdump(response_info->response_n,response_info->response,false);
+ Dbhexdump(response_info->response_n, response_info->response, false);
return false;
}
// Copy the byte array, used for this modulation to the buffer position
- memcpy(response_info->modulation,ToSend,ToSendMax);
+ memcpy(response_info->modulation, ToSend, ToSendMax);
// Store the number of bytes that were used for encoding/modulation and the time needed to transfer them
response_info->modulation_n = ToSendMax;
// "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
+// 28 * 8 data bits, 28 * 1 parity bits, 7 start bits, 7 stop bits, 7 correction bits for the modulation
// -> need 273 bytes buffer
#define ALLOCATED_TAG_MODULATION_BUFFER_SIZE 273
-bool prepare_allocated_tag_modulation(tag_response_info_t* response_info) {
+bool prepare_allocated_tag_modulation(tag_response_info_t* response_info, uint8_t **buffer, size_t *max_buffer_size) {
+
// Retrieve and store the current buffer index
- response_info->modulation = free_buffer_pointer;
-
- // Determine the maximum size we can use from our buffer
- size_t max_buffer_size = ALLOCATED_TAG_MODULATION_BUFFER_SIZE;
+ response_info->modulation = *buffer;
// Forward the prepare tag modulation function to the inner function
- if (prepare_tag_modulation(response_info, max_buffer_size)) {
- // Update the free buffer offset
- free_buffer_pointer += ToSendMax;
+ if (prepare_tag_modulation(response_info, *max_buffer_size)) {
+ // Update the free buffer offset and the remaining buffer size
+ *buffer += ToSendMax;
+ *max_buffer_size -= ToSendMax;
return true;
} else {
return false;
// 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);
-
+ uint8_t *free_buffer_pointer = BigBuf_malloc(ALLOCATED_TAG_MODULATION_BUFFER_SIZE);
+ size_t free_buffer_size = 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++) {
- prepare_allocated_tag_modulation(&responses[i]);
+ prepare_allocated_tag_modulation(&responses[i], &free_buffer_pointer, &free_buffer_size);
}
int len = 0;
// We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below
p_response = NULL;
} else if(receivedCmd[0] == 0x50) { // Received a HALT
-
- if (tracing) {
- 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
p_response = &responses[5]; order = 7;
p_response = &responses[6]; order = 70;
}
} else if (order == 7 && len == 8) { // Received {nr] and {ar} (part of authentication)
- if (tracing) {
- LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, true);
- }
uint32_t nr = bytes_to_num(receivedCmd,4);
uint32_t ar = bytes_to_num(receivedCmd+4,4);
Dbprintf("Auth attempt {nr}{ar}: %08x %08x",nr,ar);
default: {
// Never seen this command before
- if (tracing) {
- LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, true);
- }
Dbprintf("Received unknown command (len=%d):",len);
Dbhexdump(len,receivedCmd,false);
// Do not respond
if (prepare_tag_modulation(&dynamic_response_info,DYNAMIC_MODULATION_BUFFER_SIZE) == false) {
Dbprintf("Error preparing tag response");
- if (tracing) {
- LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, true);
- }
break;
}
p_response = &dynamic_response_info;
cmdsRecvd++;
if (p_response != NULL) {
- EmSendCmd14443aRaw(p_response->modulation, p_response->modulation_n, receivedCmd[0] == 0x52);
- // do the tracing for the previous reader request and this tag answer:
- uint8_t par[MAX_PARITY_SIZE];
- GetParity(p_response->response, p_response->response_n, par);
-
- EmLogTrace(Uart.output,
- Uart.len,
- Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG,
- Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG,
- Uart.parity,
- p_response->response,
- p_response->response_n,
- LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG,
- (LastTimeProxToAirStart + p_response->ProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG,
- par);
+ EmSendPrecompiledCmd(p_response, receivedCmd[0] == 0x52);
}
if (!tracing) {
// prepare a delayed transfer. This simply shifts ToSend[] by a number
// of bits specified in the delay parameter.
-void PrepareDelayedTransfer(uint16_t delay)
+static void PrepareDelayedTransfer(uint16_t delay)
{
uint8_t bitmask = 0;
uint8_t bits_to_shift = 0;
//-----------------------------------------------------------------------------
// Prepare reader command (in bits, support short frames) to send to FPGA
//-----------------------------------------------------------------------------
-void CodeIso14443aBitsAsReaderPar(const uint8_t *cmd, uint16_t bits, const uint8_t *parity)
+static void CodeIso14443aBitsAsReaderPar(const uint8_t *cmd, uint16_t bits, const uint8_t *parity)
{
int i, j;
int last;
ToSendMax++;
}
-//-----------------------------------------------------------------------------
-// Prepare reader command to send to FPGA
-//-----------------------------------------------------------------------------
-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)
+int EmGetCmd(uint8_t *received, uint16_t *len, uint8_t *parity)
{
*len = 0;
b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
if(MillerDecoding(b, 0)) {
*len = Uart.len;
+ EmLogTraceReader();
return 0;
}
}
{
uint8_t b;
uint16_t i = 0;
- uint32_t ThisTransferTime;
// Modulate Manchester
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD);
if (AT91C_BASE_SSC->SSC_RHR) break;
}
- while ((ThisTransferTime = GetCountSspClk()) & 0x00000007);
-
- // Clear TXRDY:
- AT91C_BASE_SSC->SSC_THR = SEC_F;
+ LastTimeProxToAirStart = (GetCountSspClk() & 0xfffffff8) + (correctionNeeded?8:0);
// send cycle
for(; i < respLen; ) {
// Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again:
uint8_t fpga_queued_bits = FpgaSendQueueDelay >> 3;
- for (i = 0; i <= fpga_queued_bits/8 + 1; ) {
+ for (i = 0; i < fpga_queued_bits/8; ) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
AT91C_BASE_SSC->SSC_THR = SEC_F;
FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
}
}
- LastTimeProxToAirStart = ThisTransferTime + (correctionNeeded?8:0);
-
return 0;
}
-int EmSend4bitEx(uint8_t resp, bool correctionNeeded){
+
+static int EmSend4bitEx(uint8_t resp, bool correctionNeeded){
Code4bitAnswerAsTag(resp);
int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded);
// do the tracing for the previous reader request and this tag answer:
- uint8_t par[1];
- GetParity(&resp, 1, par);
- EmLogTrace(Uart.output,
- Uart.len,
- Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG,
- Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG,
- Uart.parity,
- &resp,
- 1,
- LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG,
- (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG,
- par);
+ EmLogTraceTag(&resp, 1, NULL, LastProxToAirDuration);
return res;
}
+
int EmSend4bit(uint8_t resp){
return EmSend4bitEx(resp, false);
}
-int EmSendCmdExPar(uint8_t *resp, uint16_t respLen, bool correctionNeeded, uint8_t *par){
+
+static int EmSendCmdExPar(uint8_t *resp, uint16_t respLen, bool correctionNeeded, uint8_t *par){
CodeIso14443aAsTagPar(resp, respLen, par);
int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded);
// do the tracing for the previous reader request and this tag answer:
- EmLogTrace(Uart.output,
- Uart.len,
- Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG,
- Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG,
- Uart.parity,
- resp,
- respLen,
- LastTimeProxToAirStart*16 + DELAY_ARM2AIR_AS_TAG,
- (LastTimeProxToAirStart + LastProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG,
- par);
+ EmLogTraceTag(resp, respLen, par, LastProxToAirDuration);
return res;
}
+
int EmSendCmdEx(uint8_t *resp, uint16_t respLen, bool correctionNeeded){
uint8_t par[MAX_PARITY_SIZE];
GetParity(resp, respLen, par);
return EmSendCmdExPar(resp, respLen, correctionNeeded, par);
}
+
int EmSendCmd(uint8_t *resp, uint16_t respLen){
uint8_t par[MAX_PARITY_SIZE];
GetParity(resp, respLen, par);
return EmSendCmdExPar(resp, respLen, false, par);
}
+
int EmSendCmdPar(uint8_t *resp, uint16_t respLen, uint8_t *par){
return EmSendCmdExPar(resp, respLen, false, 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)
-{
- if (tracing) {
- // we cannot exactly measure the end and start of a received command from reader. However we know that the delay from
- // end of the received command to start of the tag's (simulated by us) answer is n*128+20 or n*128+84 resp.
- // with n >= 9. The start of the tags answer can be measured and therefore the end of the received command be calculated:
- uint16_t reader_modlen = reader_EndTime - reader_StartTime;
- uint16_t approx_fdt = tag_StartTime - reader_EndTime;
- uint16_t exact_fdt = (approx_fdt - 20 + 32)/64 * 64 + 20;
- reader_EndTime = tag_StartTime - exact_fdt;
- reader_StartTime = reader_EndTime - reader_modlen;
- if (!LogTrace(reader_data, reader_len, reader_StartTime, reader_EndTime, reader_Parity, true)) {
- return false;
- } else return(!LogTrace(tag_data, tag_len, tag_StartTime, tag_EndTime, tag_Parity, false));
- } else {
- return true;
- }
+
+int EmSendPrecompiledCmd(tag_response_info_t *response_info, bool correctionNeeded) {
+ int ret = EmSendCmd14443aRaw(response_info->modulation, response_info->modulation_n, correctionNeeded);
+ // do the tracing for the previous reader request and this tag answer:
+ EmLogTraceTag(response_info->response, response_info->response_n, &(response_info->par), response_info->ProxToAirDuration);
+ return ret;
}
+
//-----------------------------------------------------------------------------
// Wait a certain time for tag response
// If a response is captured return true
}
-void ReaderTransmitBits(uint8_t* frame, uint16_t len, uint32_t *timing)
+static void ReaderTransmitBits(uint8_t* frame, uint16_t len, uint32_t *timing)
{
// Generate parity and redirect
uint8_t par[MAX_PARITY_SIZE];
ReaderTransmitBitsPar(frame, len*8, par, timing);
}
-int ReaderReceiveOffset(uint8_t* receivedAnswer, uint16_t offset, uint8_t *parity)
+
+static int ReaderReceiveOffset(uint8_t* receivedAnswer, uint16_t offset, uint8_t *parity)
{
if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, offset)) return false;
if (tracing) {
return Demod.len;
}
+
int ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity)
{
if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, 0)) return false;
return 1;
}
+
void iso14443a_setup(uint8_t fpga_minor_mode) {
FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
// Set up the synchronous serial port
DemodReset();
UartReset();
NextTransferTime = 2*DELAY_ARM2AIR_AS_READER;
- iso14a_set_timeout(1050); // 10ms default
+ iso14a_set_timeout(1060); // 10ms default
}
+
int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) {
uint8_t parity[MAX_PARITY_SIZE];
uint8_t real_cmd[cmd_len+4];
return len;
}
+
//-----------------------------------------------------------------------------
// Read an ISO 14443a tag. Send out commands and store answers.
//
// 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.
-int32_t dist_nt(uint32_t nt1, uint32_t nt2) {
+static int32_t dist_nt(uint32_t nt1, uint32_t nt2) {
uint16_t i;
uint32_t nttmp1, nttmp2;
set_tracing(false);
}
-/**
- *MIFARE 1K simulate.
- *
- *@param flags :
- * FLAG_INTERACTIVE - In interactive mode, we are expected to finish the operation with an ACK
- * FLAG_4B_UID_IN_DATA - means that there is a 4-byte UID in the data-section, we're expected to use that
- * FLAG_7B_UID_IN_DATA - means that there is a 7-byte UID in the data-section, we're expected to use that
- * FLAG_10B_UID_IN_DATA - use 10-byte UID in the data-section not finished
- * FLAG_NR_AR_ATTACK - means we should collect NR_AR responses for bruteforcing later
- * FLAG_RANDOM_NONCE - means we should generate some pseudo-random nonce data (only allows moebius attack)
- *@param exitAfterNReads, exit simulation after n blocks have been read, 0 is infinite ...
- * (unless reader attack mode enabled then it runs util it gets enough nonces to recover all keys attmpted)
- */
-void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *datain)
-{
- int cardSTATE = MFEMUL_NOFIELD;
- int _UID_LEN = 0; // 4, 7, 10
- int vHf = 0; // in mV
- int res;
- 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
- uint8_t receivedCmd[MAX_MIFARE_FRAME_SIZE];
- uint8_t receivedCmd_par[MAX_MIFARE_PARITY_SIZE];
- uint8_t response[MAX_MIFARE_FRAME_SIZE];
- uint8_t response_par[MAX_MIFARE_PARITY_SIZE];
-
- 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 rUIDBCC3[] = {0xde, 0xad, 0xbe, 0xaf, 0x62};
-
- uint8_t rSAKfinal[]= {0x08, 0xb6, 0xdd}; // mifare 1k indicated
- uint8_t rSAK1[] = {0x04, 0xda, 0x17}; // indicate UID not finished
-
- uint8_t rAUTH_NT[] = {0x01, 0x02, 0x03, 0x04};
- uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00};
-
- //Here, we collect UID,sector,keytype,NT,AR,NR,NT2,AR2,NR2
- // This will be used in the reader-only attack.
-
- //allow collecting up to 7 sets of nonces to allow recovery of up to 7 keys
- #define ATTACK_KEY_COUNT 7 // keep same as define in cmdhfmf.c -> readerAttack() (Cannot be more than 7)
- nonces_t ar_nr_resp[ATTACK_KEY_COUNT*2]; //*2 for 2 separate attack types (nml, moebius)
- memset(ar_nr_resp, 0x00, sizeof(ar_nr_resp));
-
- uint8_t ar_nr_collected[ATTACK_KEY_COUNT*2]; //*2 for 2nd attack type (moebius)
- memset(ar_nr_collected, 0x00, sizeof(ar_nr_collected));
- uint8_t nonce1_count = 0;
- uint8_t nonce2_count = 0;
- uint8_t moebius_n_count = 0;
- bool gettingMoebius = false;
- uint8_t mM = 0; //moebius_modifier for collection storage
-
- // Authenticate response - nonce
- uint32_t nonce;
- if (flags & FLAG_RANDOM_NONCE) {
- nonce = prand();
- } else {
- nonce = bytes_to_num(rAUTH_NT, 4);
- }
-
- //-- 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];
- _UID_LEN = 4;
- } 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);
- _UID_LEN = 7;
- } else if (flags & FLAG_10B_UID_IN_DATA) {
- memcpy(&rUIDBCC1[1], datain, 3);
- memcpy(&rUIDBCC2[1], datain+3, 3);
- memcpy( rUIDBCC3, datain+6, 4);
- _UID_LEN = 10;
- } else {
- // get UID from emul memory - guess at length
- emlGetMemBt(receivedCmd, 7, 1);
- if (receivedCmd[0] == 0x00) { // ---------- 4BUID
- emlGetMemBt(rUIDBCC1, 0, 4);
- _UID_LEN = 4;
- } else { // ---------- 7BUID
- emlGetMemBt(&rUIDBCC1[1], 0, 3);
- emlGetMemBt(rUIDBCC2, 3, 4);
- _UID_LEN = 7;
- }
- }
-
- switch (_UID_LEN) {
- case 4:
- // save CUID
- 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:
- rATQA[0] |= 0x40;
- // save CUID
- 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:
- rATQA[0] |= 0x80;
- //sak_10[0] &= 0xFB;
- // save CUID
- 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;
- }
-
- // 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;
- bool button_pushed = BUTTON_PRESS();
- while (!button_pushed && !finished && !usb_poll_validate_length()) {
- WDT_HIT();
-
- // find reader field
- if (cardSTATE == MFEMUL_NOFIELD) {
- vHf = (MAX_ADC_HF_VOLTAGE * AvgAdc(ADC_CHAN_HF)) >> 10;
- if (vHf > MF_MINFIELDV) {
- cardSTATE_TO_IDLE();
- LED_A_ON();
- }
- }
- if (cardSTATE == MFEMUL_NOFIELD) {
- button_pushed = BUTTON_PRESS();
- continue;
- }
-
- //Now, get data
- res = EmGetCmd(receivedCmd, &len, receivedCmd_par);
- if (res == 2) { //Field is off!
- cardSTATE = MFEMUL_NOFIELD;
- LEDsoff();
- continue;
- } else if (res == 1) {
- break; //return value 1 means button press
- }
-
- // REQ or WUP request in ANY state and WUP in HALTED state
- if (len == 1 && ((receivedCmd[0] == ISO14443A_CMD_REQA && cardSTATE != MFEMUL_HALTED) || receivedCmd[0] == ISO14443A_CMD_WUPA)) {
- selTimer = GetTickCount();
- EmSendCmdEx(rATQA, sizeof(rATQA), (receivedCmd[0] == ISO14443A_CMD_WUPA));
- cardSTATE = MFEMUL_SELECT1;
-
- // init crypto block
- LED_B_OFF();
- LED_C_OFF();
- crypto1_destroy(pcs);
- cardAUTHKEY = 0xff;
- if (flags & FLAG_RANDOM_NONCE) {
- nonce = prand();
- }
- continue;
- }
-
- switch (cardSTATE) {
- case MFEMUL_NOFIELD:
- case MFEMUL_HALTED:
- case MFEMUL_IDLE:{
- LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, true);
- break;
- }
- case MFEMUL_SELECT1:{
- // select all - 0x93 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;
- }
-
- // select card - 0x93 0x70 ...
- if (len == 9 &&
- (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC1, 4) == 0)) {
- if (MF_DBGLEVEL >= 4)
- Dbprintf("SELECT %02x%02x%02x%02x received",receivedCmd[2],receivedCmd[3],receivedCmd[4],receivedCmd[5]);
-
- switch(_UID_LEN) {
- case 4:
- cardSTATE = MFEMUL_WORK;
- LED_B_ON();
- if (MF_DBGLEVEL >= 4) Dbprintf("--> WORK. anticol1 time: %d", GetTickCount() - selTimer);
- EmSendCmd(rSAKfinal, sizeof(rSAKfinal));
- break;
- case 7:
- cardSTATE = MFEMUL_SELECT2;
- EmSendCmd(rSAK1, sizeof(rSAK1));
- break;
- case 10:
- cardSTATE = MFEMUL_SELECT2;
- EmSendCmd(rSAK1, sizeof(rSAK1));
- break;
- default:break;
- }
- } else {
- 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;
- }
- // select all cl3 - 0x97 0x20
- if (len == 2 && (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_3 && receivedCmd[1] == 0x20)) {
- EmSendCmd(rUIDBCC3, sizeof(rUIDBCC3));
- break;
- }
- // select card cl3 - 0x97 0x70
- if (len == 9 &&
- (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_3 &&
- receivedCmd[1] == 0x70 &&
- memcmp(&receivedCmd[2], rUIDBCC3, 4) == 0) ) {
-
- EmSendCmd(rSAKfinal, sizeof(rSAKfinal));
- 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:{
- if( len != 8) {
- 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;
- }
-
- uint32_t nr = bytes_to_num(receivedCmd, 4);
- uint32_t ar = bytes_to_num(&receivedCmd[4], 4);
-
- // Collect AR/NR per keytype & sector
- if(flags & FLAG_NR_AR_ATTACK) {
- for (uint8_t i = 0; i < ATTACK_KEY_COUNT; i++) {
- if ( ar_nr_collected[i+mM]==0 || ((cardAUTHSC == ar_nr_resp[i+mM].sector) && (cardAUTHKEY == ar_nr_resp[i+mM].keytype) && (ar_nr_collected[i+mM] > 0)) ) {
- // if first auth for sector, or matches sector and keytype of previous auth
- if (ar_nr_collected[i+mM] < 2) {
- // if we haven't already collected 2 nonces for this sector
- if (ar_nr_resp[ar_nr_collected[i+mM]].ar != ar) {
- // Avoid duplicates... probably not necessary, ar should vary.
- if (ar_nr_collected[i+mM]==0) {
- // first nonce collect
- ar_nr_resp[i+mM].cuid = cuid;
- ar_nr_resp[i+mM].sector = cardAUTHSC;
- ar_nr_resp[i+mM].keytype = cardAUTHKEY;
- ar_nr_resp[i+mM].nonce = nonce;
- ar_nr_resp[i+mM].nr = nr;
- ar_nr_resp[i+mM].ar = ar;
- nonce1_count++;
- // add this nonce to first moebius nonce
- ar_nr_resp[i+ATTACK_KEY_COUNT].cuid = cuid;
- ar_nr_resp[i+ATTACK_KEY_COUNT].sector = cardAUTHSC;
- ar_nr_resp[i+ATTACK_KEY_COUNT].keytype = cardAUTHKEY;
- ar_nr_resp[i+ATTACK_KEY_COUNT].nonce = nonce;
- ar_nr_resp[i+ATTACK_KEY_COUNT].nr = nr;
- ar_nr_resp[i+ATTACK_KEY_COUNT].ar = ar;
- ar_nr_collected[i+ATTACK_KEY_COUNT]++;
- } else { // second nonce collect (std and moebius)
- ar_nr_resp[i+mM].nonce2 = nonce;
- ar_nr_resp[i+mM].nr2 = nr;
- ar_nr_resp[i+mM].ar2 = ar;
- if (!gettingMoebius) {
- nonce2_count++;
- // check if this was the last second nonce we need for std attack
- if ( nonce2_count == nonce1_count ) {
- // done collecting std test switch to moebius
- // first finish incrementing last sample
- ar_nr_collected[i+mM]++;
- // switch to moebius collection
- gettingMoebius = true;
- mM = ATTACK_KEY_COUNT;
- if (flags & FLAG_RANDOM_NONCE) {
- nonce = prand();
- } else {
- nonce = nonce*7;
- }
- break;
- }
- } else {
- moebius_n_count++;
- // if we've collected all the nonces we need - finish.
- if (nonce1_count == moebius_n_count) finished = true;
- }
- }
- ar_nr_collected[i+mM]++;
- }
- }
- // we found right spot for this nonce stop looking
- break;
- }
- }
- }
-
- // --- crypto
- crypto1_word(pcs, nr , 1);
- cardRr = ar ^ crypto1_word(pcs, 0, 0);
-
- // test if auth OK
- if (cardRr != prng_successor(nonce, 64)){
- if (MF_DBGLEVEL >= 2) 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;
- }
-
- //auth successful
- 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, cardAUTHKEY == 0 ? 'A' : 'B',
- 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;
- }
- // select all cl2 - 0x95 0x20
- if (len == 2 && (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && receivedCmd[1] == 0x20)) {
- EmSendCmd(rUIDBCC2, sizeof(rUIDBCC2));
- break;
- }
-
- // select cl2 card - 0x95 0x70 xxxxxxxxxxxx
- if (len == 9 &&
- (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC2, 4) == 0)) {
- switch(_UID_LEN) {
- case 7:
- EmSendCmd(rSAKfinal, sizeof(rSAKfinal));
- cardSTATE = MFEMUL_WORK;
- LED_B_ON();
- if (MF_DBGLEVEL >= 4) Dbprintf("--> WORK. anticol2 time: %d", GetTickCount() - selTimer);
- break;
- case 10:
- EmSendCmd(rSAK1, sizeof(rSAK1));
- cardSTATE = MFEMUL_SELECT3;
- break;
- default:break;
- }
- 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
- }
-
- 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) ;
-
- if(encrypted_data) {
- // decrypt seqence
- mf_crypto1_decrypt(pcs, receivedCmd, len);
- }
-
- if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) {
-
- // if authenticating to a block that shouldn't exist - as long as we are not doing the reader attack
- if (receivedCmd[1] >= 16 * 4 && !(flags & FLAG_NR_AR_ATTACK)) {
- //is this the correct response to an auth on a out of range block? marshmellow
- EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
- if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02x) on out of range block: %d (0x%02x), nacking",receivedCmd[0],receivedCmd[1],receivedCmd[1]);
- break;
- }
-
- authTimer = GetTickCount();
- cardAUTHSC = receivedCmd[1] / 4; // received block num
- cardAUTHKEY = receivedCmd[0] - 0x60;
- crypto1_destroy(pcs);//Added by martin
- crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY));
- //uint64_t key=emlGetKey(cardAUTHSC, cardAUTHKEY);
- //Dbprintf("key: %04x%08x",(uint32_t)(key>>32)&0xFFFF,(uint32_t)(key&0xFFFFFFFF));
-
- 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 );
-
- 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 );
- ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0);
- num_to_bytes(ans, 4, rAUTH_AT);
- }
-
- 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;
- }
-
- // rule 13 of 7.5.3. in ISO 14443-4. chaining shall be continued
- // BUT... ACK --> NACK
- if (len == 1 && receivedCmd[0] == CARD_ACK) {
- EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
- break;
- }
-
- // rule 12 of 7.5.3. in ISO 14443-4. R(NAK) --> R(ACK)
- if (len == 1 && receivedCmd[0] == CARD_NACK_NA) {
- EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
- break;
- }
-
- 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;
- }
-
- 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[1] >= 16 * 4) {
- EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
- if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02x) on out of range block: %d (0x%02x), nacking",receivedCmd[0],receivedCmd[1],receivedCmd[1]);
- break;
- }
-
- if (receivedCmd[1] / 4 != cardAUTHSC) {
- EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
- if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02x) on block (0x%02x) not authenticated for (0x%02x), nacking",receivedCmd[0],receivedCmd[1],cardAUTHSC);
- break;
- }
- }
- // read block
- if (receivedCmd[0] == 0x30) {
- if (MF_DBGLEVEL >= 4) {
- Dbprintf("Reader reading block %d (0x%02x)",receivedCmd[1],receivedCmd[1]);
- }
- emlGetMem(response, receivedCmd[1], 1);
- AppendCrc14443a(response, 16);
- mf_crypto1_encrypt(pcs, response, 18, response_par);
- EmSendCmdPar(response, 18, response_par);
- numReads++;
- if(exitAfterNReads > 0 && numReads == exitAfterNReads) {
- Dbprintf("%d reads done, exiting", numReads);
- finished = true;
- }
- break;
- }
- // write block
- if (receivedCmd[0] == 0xA0) {
- 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 (emlCheckValBl(receivedCmd[1])) {
- if (MF_DBGLEVEL >= 2) 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;
- 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 (emlSetValBl(cardINTREG, cardINTBLOCK, receivedCmd[1]))
- EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
- else
- EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
- break;
- }
- // halt
- if (receivedCmd[0] == 0x50 && receivedCmd[1] == 0x00) {
- LED_B_OFF();
- LED_C_OFF();
- cardSTATE = MFEMUL_HALTED;
- if (MF_DBGLEVEL >= 4) Dbprintf("--> HALTED. Selected time: %d ms", GetTickCount() - selTimer);
- LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, true);
- break;
- }
- // RATS
- if (receivedCmd[0] == 0xe0) {//RATS
- EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
- break;
- }
- // command not allowed
- if (MF_DBGLEVEL >= 4) Dbprintf("Received command not allowed, nacking");
- EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
- break;
- }
- case MFEMUL_WRITEBL2:{
- if (len == 18){
- mf_crypto1_decrypt(pcs, receivedCmd, len);
- emlSetMem(receivedCmd, cardWRBL, 1);
- EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
- cardSTATE = MFEMUL_WORK;
- } else {
- 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;
- }
-
- case MFEMUL_INTREG_INC:{
- mf_crypto1_decrypt(pcs, receivedCmd, len);
- memcpy(&ans, receivedCmd, 4);
- if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
- EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
- cardSTATE_TO_IDLE();
- break;
- }
- LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, true);
- cardINTREG = cardINTREG + ans;
- cardSTATE = MFEMUL_WORK;
- break;
- }
- case MFEMUL_INTREG_DEC:{
- mf_crypto1_decrypt(pcs, receivedCmd, len);
- memcpy(&ans, receivedCmd, 4);
- if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
- EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
- cardSTATE_TO_IDLE();
- break;
- }
- LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, true);
- cardINTREG = cardINTREG - ans;
- cardSTATE = MFEMUL_WORK;
- break;
- }
- case MFEMUL_INTREG_REST:{
- mf_crypto1_decrypt(pcs, receivedCmd, len);
- memcpy(&ans, receivedCmd, 4);
- if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
- EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
- cardSTATE_TO_IDLE();
- break;
- }
- LogTrace(Uart.output, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, true);
- cardSTATE = MFEMUL_WORK;
- break;
- }
- }
- button_pushed = BUTTON_PRESS();
- }
-
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- LEDsoff();
-
- if(flags & FLAG_NR_AR_ATTACK && MF_DBGLEVEL >= 1) {
- for ( uint8_t i = 0; i < ATTACK_KEY_COUNT; i++) {
- if (ar_nr_collected[i] == 2) {
- Dbprintf("Collected two pairs of AR/NR which can be used to extract %s from reader for sector %d:", (i<ATTACK_KEY_COUNT/2) ? "keyA" : "keyB", ar_nr_resp[i].sector);
- Dbprintf("../tools/mfkey/mfkey32 %08x %08x %08x %08x %08x %08x",
- ar_nr_resp[i].cuid, //UID
- ar_nr_resp[i].nonce, //NT
- ar_nr_resp[i].nr, //NR1
- ar_nr_resp[i].ar, //AR1
- ar_nr_resp[i].nr2, //NR2
- ar_nr_resp[i].ar2 //AR2
- );
- }
- }
- for ( uint8_t i = ATTACK_KEY_COUNT; i < ATTACK_KEY_COUNT*2; i++) {
- if (ar_nr_collected[i] == 2) {
- Dbprintf("Collected two pairs of AR/NR which can be used to extract %s from reader for sector %d:", (i<ATTACK_KEY_COUNT/2) ? "keyA" : "keyB", ar_nr_resp[i].sector);
- Dbprintf("../tools/mfkey/mfkey32v2 %08x %08x %08x %08x %08x %08x %08x",
- ar_nr_resp[i].cuid, //UID
- ar_nr_resp[i].nonce, //NT
- ar_nr_resp[i].nr, //NR1
- ar_nr_resp[i].ar, //AR1
- ar_nr_resp[i].nonce2,//NT2
- ar_nr_resp[i].nr2, //NR2
- ar_nr_resp[i].ar2 //AR2
- );
- }
- }
- }
- if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, BigBuf_get_traceLen());
-
- if(flags & FLAG_INTERACTIVE) { // Interactive mode flag, means we need to send ACK
- //Send the collected ar_nr in the response
- cmd_send(CMD_ACK,CMD_SIMULATE_MIFARE_CARD,button_pushed,0,&ar_nr_resp,sizeof(ar_nr_resp));
- }
-}
-
//-----------------------------------------------------------------------------
// MIFARE sniffer.
--- /dev/null
+//-----------------------------------------------------------------------------
+// Merlok - June 2011, 2012
+// Gerhard de Koning Gans - May 2008
+// Hagen Fritsch - June 2010
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// Mifare Classic Card Simulation
+//-----------------------------------------------------------------------------
+
+#include "mifaresim.h"
+#include "iso14443a.h"
+#include "iso14443crc.h"
+#include "crapto1/crapto1.h"
+#include "BigBuf.h"
+#include "string.h"
+#include "mifareutil.h"
+#include "fpgaloader.h"
+#include "proxmark3.h"
+#include "usb_cdc.h"
+#include "cmd.h"
+#include "protocols.h"
+#include "apps.h"
+
+//mifare emulator states
+#define MFEMUL_NOFIELD 0
+#define MFEMUL_IDLE 1
+#define MFEMUL_SELECT1 2
+#define MFEMUL_SELECT2 3
+#define MFEMUL_SELECT3 4
+#define MFEMUL_AUTH1 5
+#define MFEMUL_AUTH2 6
+#define MFEMUL_WORK 7
+#define MFEMUL_WRITEBL2 8
+#define MFEMUL_INTREG_INC 9
+#define MFEMUL_INTREG_DEC 10
+#define MFEMUL_INTREG_REST 11
+#define MFEMUL_HALTED 12
+
+#define cardSTATE_TO_IDLE() { cardSTATE = MFEMUL_IDLE; LED_B_OFF(); LED_C_OFF(); }
+
+
+
+static void MifareSimInit(uint8_t flags, uint8_t *datain, tag_response_info_t **responses, uint32_t *cuid, uint8_t *uid_len) {
+
+ #define TAG_RESPONSE_COUNT 5 // number of precompiled responses
+ static uint8_t rATQA[] = {0x04, 0x00}; // indicate Mifare classic 1k 4Byte UID
+ static uint8_t rUIDBCC1[] = {0x00, 0x00, 0x00, 0x00, 0x00}; // UID 1st cascade level
+ static uint8_t rUIDBCC2[] = {0x00, 0x00, 0x00, 0x00, 0x00}; // UID 2nd cascade level
+ static uint8_t rSAKfinal[]= {0x08, 0xb6, 0xdd}; // mifare 1k indicated
+ static uint8_t rSAK1[] = {0x04, 0xda, 0x17}; // indicate UID not finished
+
+ *uid_len = 4;
+ // UID can be set from emulator memory or incoming data and can be 4 or 7 bytes long
+ if (flags & FLAG_4B_UID_IN_DATA) { // get UID from datain
+ memcpy(rUIDBCC1, datain, 4);
+ } else if (flags & FLAG_7B_UID_IN_DATA) {
+ rUIDBCC1[0] = 0x88;
+ memcpy(rUIDBCC1+1, datain, 3);
+ memcpy(rUIDBCC2, datain+3, 4);
+ *uid_len = 7;
+ } else {
+ uint8_t probable_atqa;
+ emlGetMemBt(&probable_atqa, 7, 1); // get UID from emul memory - weak guess at length
+ if (probable_atqa == 0x00) { // ---------- 4BUID
+ emlGetMemBt(rUIDBCC1, 0, 4);
+ } else { // ---------- 7BUID
+ rUIDBCC1[0] = 0x88;
+ emlGetMemBt(rUIDBCC1+1, 0, 3);
+ emlGetMemBt(rUIDBCC2, 3, 4);
+ *uid_len = 7;
+ }
+ }
+
+ switch (*uid_len) {
+ case 4:
+ *cuid = bytes_to_num(rUIDBCC1, 4);
+ 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:
+ rATQA[0] |= 0x40;
+ *cuid = bytes_to_num(rUIDBCC2, 4);
+ 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;
+ default:
+ break;
+ }
+
+ static tag_response_info_t responses_init[TAG_RESPONSE_COUNT] = {
+ { .response = rATQA, .response_n = sizeof(rATQA) }, // Answer to request - respond with card type
+ { .response = rUIDBCC1, .response_n = sizeof(rUIDBCC1) }, // Anticollision cascade1 - respond with first part of uid
+ { .response = rUIDBCC2, .response_n = sizeof(rUIDBCC2) }, // Anticollision cascade2 - respond with 2nd part of uid
+ { .response = rSAKfinal, .response_n = sizeof(rSAKfinal) }, // Acknowledge select - last cascade
+ { .response = rSAK1, .response_n = sizeof(rSAK1) } // Acknowledge select - previous cascades
+ };
+
+ // Prepare ("precompile") the responses of the anticollision phase. There will be not enough time to do this at the moment the reader sends its REQA or SELECT
+ // There are 7 predefined responses with a total of 18 bytes data to transmit. Coded responses need one byte per bit to transfer (data, parity, start, stop, correction)
+ // 18 * 8 data bits, 18 * 1 parity bits, 5 start bits, 5 stop bits, 5 correction bits -> need 177 bytes buffer
+ #define ALLOCATED_TAG_MODULATION_BUFFER_SIZE 177 // number of bytes required for precompiled responses
+
+ uint8_t *free_buffer_pointer = BigBuf_malloc(ALLOCATED_TAG_MODULATION_BUFFER_SIZE);
+ size_t free_buffer_size = ALLOCATED_TAG_MODULATION_BUFFER_SIZE;
+ for (size_t i = 0; i < TAG_RESPONSE_COUNT; i++) {
+ prepare_allocated_tag_modulation(&responses_init[i], &free_buffer_pointer, &free_buffer_size);
+ }
+
+ *responses = responses_init;
+
+ // indices into responses array:
+ #define ATQA 0
+ #define UIDBCC1 1
+ #define UIDBCC2 2
+ #define SAKfinal 3
+ #define SAK1 4
+
+}
+
+
+static bool HasValidCRC(uint8_t *receivedCmd, uint16_t receivedCmd_len) {
+ uint8_t CRC_byte_1, CRC_byte_2;
+ ComputeCrc14443(CRC_14443_A, receivedCmd, receivedCmd_len-2, &CRC_byte_1, &CRC_byte_2);
+ return (receivedCmd[receivedCmd_len-2] == CRC_byte_1 && receivedCmd[receivedCmd_len-1] == CRC_byte_2);
+}
+
+
+/**
+ *MIFARE 1K simulate.
+ *
+ *@param flags :
+ * FLAG_INTERACTIVE - In interactive mode, we are expected to finish the operation with an ACK
+ * FLAG_4B_UID_IN_DATA - means that there is a 4-byte UID in the data-section, we're expected to use that
+ * FLAG_7B_UID_IN_DATA - means that there is a 7-byte UID in the data-section, we're expected to use that
+ * FLAG_10B_UID_IN_DATA - use 10-byte UID in the data-section not finished
+ * FLAG_NR_AR_ATTACK - means we should collect NR_AR responses for bruteforcing later
+ * FLAG_RANDOM_NONCE - means we should generate some pseudo-random nonce data (only allows moebius attack)
+ *@param exitAfterNReads, exit simulation after n blocks have been read, 0 is infinite ...
+ * (unless reader attack mode enabled then it runs util it gets enough nonces to recover all keys attmpted)
+ */
+void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *datain)
+{
+ tag_response_info_t *responses;
+ uint8_t uid_len = 4;
+ uint32_t cuid = 0;
+ uint8_t cardWRBL = 0;
+ uint8_t cardAUTHSC = 0;
+ uint8_t cardAUTHKEY = 0xff; // no authentication
+ uint32_t cardRr = 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 reads a block
+ uint8_t receivedCmd[MAX_MIFARE_FRAME_SIZE];
+ uint8_t receivedCmd_dec[MAX_MIFARE_FRAME_SIZE];
+ uint8_t receivedCmd_par[MAX_MIFARE_PARITY_SIZE];
+ uint16_t receivedCmd_len;
+ uint8_t response[MAX_MIFARE_FRAME_SIZE];
+ uint8_t response_par[MAX_MIFARE_PARITY_SIZE];
+
+ uint8_t rAUTH_NT[] = {0x01, 0x02, 0x03, 0x04};
+ uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00};
+
+ //Here, we collect UID,sector,keytype,NT,AR,NR,NT2,AR2,NR2
+ // This will be used in the reader-only attack.
+
+ //allow collecting up to 7 sets of nonces to allow recovery of up to 7 keys
+ #define ATTACK_KEY_COUNT 7 // keep same as define in cmdhfmf.c -> readerAttack() (Cannot be more than 7)
+ nonces_t ar_nr_resp[ATTACK_KEY_COUNT*2]; //*2 for 2 separate attack types (nml, moebius) 36 * 7 * 2 bytes = 504 bytes
+ memset(ar_nr_resp, 0x00, sizeof(ar_nr_resp));
+
+ uint8_t ar_nr_collected[ATTACK_KEY_COUNT*2]; //*2 for 2nd attack type (moebius)
+ memset(ar_nr_collected, 0x00, sizeof(ar_nr_collected));
+ uint8_t nonce1_count = 0;
+ uint8_t nonce2_count = 0;
+ uint8_t moebius_n_count = 0;
+ bool gettingMoebius = false;
+ uint8_t mM = 0; //moebius_modifier for collection storage
+
+ // Authenticate response - nonce
+ uint32_t nonce;
+ if (flags & FLAG_RANDOM_NONCE) {
+ nonce = prand();
+ } else {
+ nonce = bytes_to_num(rAUTH_NT, 4);
+ }
+
+ // free eventually allocated BigBuf memory but keep Emulator Memory
+ BigBuf_free_keep_EM();
+
+ MifareSimInit(flags, datain, &responses, &cuid, &uid_len);
+
+ // We need to listen to the high-frequency, peak-detected path.
+ iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
+
+ // clear trace
+ clear_trace();
+ set_tracing(true);
+ ResetSspClk();
+
+ bool finished = false;
+ bool button_pushed = BUTTON_PRESS();
+ int cardSTATE = MFEMUL_NOFIELD;
+
+ while (!button_pushed && !finished && !usb_poll_validate_length()) {
+ WDT_HIT();
+
+ // find reader field
+ if (cardSTATE == MFEMUL_NOFIELD) {
+ int vHf = (MAX_ADC_HF_VOLTAGE * AvgAdc(ADC_CHAN_HF)) >> 10;
+ if (vHf > MF_MINFIELDV) {
+ LED_A_ON();
+ cardSTATE_TO_IDLE();
+ }
+ button_pushed = BUTTON_PRESS();
+ continue;
+ }
+
+ //Now, get data
+ int res = EmGetCmd(receivedCmd, &receivedCmd_len, receivedCmd_par);
+
+ if (res == 2) { //Field is off!
+ LEDsoff();
+ cardSTATE = MFEMUL_NOFIELD;
+ continue;
+ } else if (res == 1) { // button pressed
+ button_pushed = true;
+ break;
+ }
+
+ // WUPA in HALTED state or REQA or WUPA in any other state
+ if (receivedCmd_len == 1 && ((receivedCmd[0] == ISO14443A_CMD_REQA && cardSTATE != MFEMUL_HALTED) || receivedCmd[0] == ISO14443A_CMD_WUPA)) {
+ EmSendPrecompiledCmd(&responses[ATQA], (receivedCmd[0] == ISO14443A_CMD_WUPA));
+
+ // init crypto block
+ crypto1_destroy(pcs);
+ cardAUTHKEY = 0xff;
+ if (flags & FLAG_RANDOM_NONCE) {
+ nonce = prand();
+ }
+ LED_B_OFF();
+ LED_C_OFF();
+ cardSTATE = MFEMUL_SELECT1;
+ continue;
+ }
+
+ switch (cardSTATE) {
+ case MFEMUL_NOFIELD:
+ case MFEMUL_HALTED:
+ case MFEMUL_IDLE:{
+ break;
+ }
+ case MFEMUL_SELECT1:{
+ // select all - 0x93 0x20
+ if (receivedCmd_len == 2 && (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && receivedCmd[1] == 0x20)) {
+ if (MF_DBGLEVEL >= 4) Dbprintf("SELECT ALL CL1 received");
+ EmSendPrecompiledCmd(&responses[UIDBCC1], false);
+ break;
+ }
+ // select card - 0x93 0x70 ...
+ if (receivedCmd_len == 9 &&
+ (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], responses[UIDBCC1].response, 4) == 0)) {
+ if (MF_DBGLEVEL >= 4) Dbprintf("SELECT CL1 %02x%02x%02x%02x received",receivedCmd[2],receivedCmd[3],receivedCmd[4],receivedCmd[5]);
+ if (uid_len == 4) {
+ EmSendPrecompiledCmd(&responses[SAKfinal], false);
+ LED_B_ON();
+ cardSTATE = MFEMUL_WORK;
+ break;
+ } else if (uid_len == 7) {
+ EmSendPrecompiledCmd(&responses[SAK1], false);
+ cardSTATE = MFEMUL_SELECT2;
+ break;
+ }
+ }
+ cardSTATE_TO_IDLE();
+ break;
+ }
+ case MFEMUL_SELECT2:{
+ // select all cl2 - 0x95 0x20
+ if (receivedCmd_len == 2 && (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && receivedCmd[1] == 0x20)) {
+ if (MF_DBGLEVEL >= 4) Dbprintf("SELECT ALL CL2 received");
+ EmSendPrecompiledCmd(&responses[UIDBCC2], false);
+ break;
+ }
+ // select cl2 card - 0x95 0x70 xxxxxxxxxxxx
+ if (receivedCmd_len == 9 &&
+ (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], responses[UIDBCC2].response, 4) == 0)) {
+ if (uid_len == 7) {
+ if (MF_DBGLEVEL >= 4) Dbprintf("SELECT CL2 %02x%02x%02x%02x received",receivedCmd[2],receivedCmd[3],receivedCmd[4],receivedCmd[5]);
+ EmSendPrecompiledCmd(&responses[SAKfinal], false);
+ LED_B_ON();
+ cardSTATE = MFEMUL_WORK;
+ break;
+ }
+ }
+ cardSTATE_TO_IDLE();
+ break;
+ }
+ case MFEMUL_WORK:{
+ if (receivedCmd_len != 4) { // all commands must have exactly 4 bytes
+ break;
+ }
+ bool encrypted_data = (cardAUTHKEY != 0xFF) ;
+ if (encrypted_data) {
+ // decrypt seqence
+ mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, receivedCmd_dec);
+ } else {
+ memcpy(receivedCmd_dec, receivedCmd, receivedCmd_len);
+ }
+ if (!HasValidCRC(receivedCmd_dec, receivedCmd_len)) { // all commands must have a valid CRC
+ EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+ break;
+ }
+ if (receivedCmd_dec[0] == MIFARE_AUTH_KEYA || receivedCmd_dec[0] == MIFARE_AUTH_KEYB) {
+ // if authenticating to a block that shouldn't exist - as long as we are not doing the reader attack
+ if (receivedCmd_dec[1] >= 16 * 4 && !(flags & FLAG_NR_AR_ATTACK)) {
+ //is this the correct response to an auth on a out of range block? marshmellow
+ EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+ if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02x) on out of range block: %d (0x%02x), nacking",receivedCmd_dec[0],receivedCmd_dec[1],receivedCmd_dec[1]);
+ break;
+ }
+ cardAUTHSC = receivedCmd_dec[1] / 4; // received block num
+ cardAUTHKEY = receivedCmd_dec[0] & 0x01;
+ crypto1_destroy(pcs);//Added by martin
+ 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_dec[1], receivedCmd_dec[1], cardAUTHKEY);
+ 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_dec[1], receivedCmd_dec[1], cardAUTHKEY);
+ ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0);
+ num_to_bytes(ans, 4, rAUTH_AT);
+ }
+ EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
+ cardSTATE = MFEMUL_AUTH1;
+ break;
+ }
+ if (!encrypted_data) { // all other commands must be encrypted (authenticated)
+ break;
+ }
+ if(receivedCmd_dec[0] == ISO14443A_CMD_READBLOCK
+ || receivedCmd_dec[0] == ISO14443A_CMD_WRITEBLOCK
+ || receivedCmd_dec[0] == MIFARE_CMD_INC
+ || receivedCmd_dec[0] == MIFARE_CMD_DEC
+ || receivedCmd_dec[0] == MIFARE_CMD_RESTORE
+ || receivedCmd_dec[0] == MIFARE_CMD_TRANSFER) {
+ if (receivedCmd_dec[1] >= 16 * 4) {
+ EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+ if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02x) on out of range block: %d (0x%02x), nacking",receivedCmd_dec[0],receivedCmd_dec[1],receivedCmd_dec[1]);
+ break;
+ }
+ if (receivedCmd_dec[1] / 4 != cardAUTHSC) {
+ EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+ if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02x) on block (0x%02x) not authenticated for (0x%02x), nacking",receivedCmd_dec[0],receivedCmd_dec[1],cardAUTHSC);
+ break;
+ }
+ }
+ if (receivedCmd_dec[0] == ISO14443A_CMD_READBLOCK) {
+ if (MF_DBGLEVEL >= 4) {
+ Dbprintf("Reader reading block %d (0x%02x)",receivedCmd_dec[1],receivedCmd_dec[1]);
+ }
+ emlGetMem(response, receivedCmd_dec[1], 1);
+ AppendCrc14443a(response, 16);
+ mf_crypto1_encrypt(pcs, response, 18, response_par);
+ EmSendCmdPar(response, 18, response_par);
+ numReads++;
+ if(exitAfterNReads > 0 && numReads == exitAfterNReads) {
+ Dbprintf("%d reads done, exiting", numReads);
+ finished = true;
+ }
+ break;
+ }
+ if (receivedCmd_dec[0] == ISO14443A_CMD_WRITEBLOCK) {
+ if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0xA0 write block %d (%02x)",receivedCmd_dec[1],receivedCmd_dec[1]);
+ EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
+ cardWRBL = receivedCmd_dec[1];
+ cardSTATE = MFEMUL_WRITEBL2;
+ break;
+ }
+ if (receivedCmd_dec[0] == MIFARE_CMD_INC || receivedCmd_dec[0] == MIFARE_CMD_DEC || receivedCmd_dec[0] == MIFARE_CMD_RESTORE) {
+ if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x inc(0xC1)/dec(0xC0)/restore(0xC2) block %d (%02x)",receivedCmd_dec[0],receivedCmd_dec[1],receivedCmd_dec[1]);
+ if (emlCheckValBl(receivedCmd_dec[1])) {
+ if (MF_DBGLEVEL >= 2) 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));
+ cardWRBL = receivedCmd_dec[1];
+ if (receivedCmd_dec[0] == MIFARE_CMD_INC)
+ cardSTATE = MFEMUL_INTREG_INC;
+ if (receivedCmd_dec[0] == MIFARE_CMD_DEC)
+ cardSTATE = MFEMUL_INTREG_DEC;
+ if (receivedCmd_dec[0] == MIFARE_CMD_RESTORE)
+ cardSTATE = MFEMUL_INTREG_REST;
+ break;
+ }
+ if (receivedCmd_dec[0] == MIFARE_CMD_TRANSFER) {
+ if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x transfer block %d (%02x)",receivedCmd_dec[0],receivedCmd_dec[1],receivedCmd_dec[1]);
+ if (emlSetValBl(cardINTREG, cardINTBLOCK, receivedCmd_dec[1]))
+ EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+ else
+ EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
+ break;
+ }
+ // halt
+ if (receivedCmd_dec[0] == ISO14443A_CMD_HALT && receivedCmd_dec[1] == 0x00) {
+ if (MF_DBGLEVEL >= 4) Dbprintf("--> HALTED.");
+ LED_B_OFF();
+ LED_C_OFF();
+ cardSTATE = MFEMUL_HALTED;
+ break;
+ }
+ // command not allowed
+ if (MF_DBGLEVEL >= 4) Dbprintf("Received command not allowed, nacking");
+ EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+ break;
+ }
+ case MFEMUL_AUTH1:{
+ if (receivedCmd_len != 8) {
+ cardSTATE_TO_IDLE();
+ break;
+ }
+
+ uint32_t nr = bytes_to_num(receivedCmd, 4);
+ uint32_t ar = bytes_to_num(&receivedCmd[4], 4);
+
+ // Collect AR/NR per keytype & sector
+ if(flags & FLAG_NR_AR_ATTACK) {
+ for (uint8_t i = 0; i < ATTACK_KEY_COUNT; i++) {
+ if ( ar_nr_collected[i+mM]==0 || ((cardAUTHSC == ar_nr_resp[i+mM].sector) && (cardAUTHKEY == ar_nr_resp[i+mM].keytype) && (ar_nr_collected[i+mM] > 0)) ) {
+ // if first auth for sector, or matches sector and keytype of previous auth
+ if (ar_nr_collected[i+mM] < 2) {
+ // if we haven't already collected 2 nonces for this sector
+ if (ar_nr_resp[ar_nr_collected[i+mM]].ar != ar) {
+ // Avoid duplicates... probably not necessary, ar should vary.
+ if (ar_nr_collected[i+mM]==0) {
+ // first nonce collect
+ ar_nr_resp[i+mM].cuid = cuid;
+ ar_nr_resp[i+mM].sector = cardAUTHSC;
+ ar_nr_resp[i+mM].keytype = cardAUTHKEY;
+ ar_nr_resp[i+mM].nonce = nonce;
+ ar_nr_resp[i+mM].nr = nr;
+ ar_nr_resp[i+mM].ar = ar;
+ nonce1_count++;
+ // add this nonce to first moebius nonce
+ ar_nr_resp[i+ATTACK_KEY_COUNT].cuid = cuid;
+ ar_nr_resp[i+ATTACK_KEY_COUNT].sector = cardAUTHSC;
+ ar_nr_resp[i+ATTACK_KEY_COUNT].keytype = cardAUTHKEY;
+ ar_nr_resp[i+ATTACK_KEY_COUNT].nonce = nonce;
+ ar_nr_resp[i+ATTACK_KEY_COUNT].nr = nr;
+ ar_nr_resp[i+ATTACK_KEY_COUNT].ar = ar;
+ ar_nr_collected[i+ATTACK_KEY_COUNT]++;
+ } else { // second nonce collect (std and moebius)
+ ar_nr_resp[i+mM].nonce2 = nonce;
+ ar_nr_resp[i+mM].nr2 = nr;
+ ar_nr_resp[i+mM].ar2 = ar;
+ if (!gettingMoebius) {
+ nonce2_count++;
+ // check if this was the last second nonce we need for std attack
+ if ( nonce2_count == nonce1_count ) {
+ // done collecting std test switch to moebius
+ // first finish incrementing last sample
+ ar_nr_collected[i+mM]++;
+ // switch to moebius collection
+ gettingMoebius = true;
+ mM = ATTACK_KEY_COUNT;
+ if (flags & FLAG_RANDOM_NONCE) {
+ nonce = prand();
+ } else {
+ nonce = nonce*7;
+ }
+ break;
+ }
+ } else {
+ moebius_n_count++;
+ // if we've collected all the nonces we need - finish.
+ if (nonce1_count == moebius_n_count) finished = true;
+ }
+ }
+ ar_nr_collected[i+mM]++;
+ }
+ }
+ // we found right spot for this nonce stop looking
+ break;
+ }
+ }
+ }
+
+ // --- crypto
+ crypto1_word(pcs, nr , 1);
+ cardRr = ar ^ crypto1_word(pcs, 0, 0);
+
+ // test if auth OK
+ if (cardRr != prng_successor(nonce, 64)){
+ if (MF_DBGLEVEL >= 2) 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
+ cardAUTHKEY = 0xff; // not authenticated
+ cardSTATE_TO_IDLE();
+ break;
+ }
+ ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0);
+ num_to_bytes(ans, 4, rAUTH_AT);
+ EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
+ if (MF_DBGLEVEL >= 4) Dbprintf("AUTH COMPLETED for sector %d with key %c.", cardAUTHSC, cardAUTHKEY == 0 ? 'A' : 'B');
+ LED_C_ON();
+ cardSTATE = MFEMUL_WORK;
+ break;
+ }
+ case MFEMUL_WRITEBL2:{
+ if (receivedCmd_len == 18) {
+ mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, receivedCmd_dec);
+ if (HasValidCRC(receivedCmd_dec, receivedCmd_len)) {
+ emlSetMem(receivedCmd_dec, cardWRBL, 1);
+ EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
+ cardSTATE = MFEMUL_WORK;
+ break;
+ }
+ }
+ cardSTATE_TO_IDLE();
+ break;
+ }
+ case MFEMUL_INTREG_INC:{
+ if (receivedCmd_len == 6) {
+ mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, (uint8_t*)&ans);
+ if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
+ EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+ cardSTATE_TO_IDLE();
+ break;
+ }
+ cardINTREG = cardINTREG + ans;
+ }
+ cardSTATE = MFEMUL_WORK;
+ break;
+ }
+ case MFEMUL_INTREG_DEC:{
+ if (receivedCmd_len == 6) {
+ mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, (uint8_t*)&ans);
+ if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
+ EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+ cardSTATE_TO_IDLE();
+ break;
+ }
+ }
+ cardINTREG = cardINTREG - ans;
+ cardSTATE = MFEMUL_WORK;
+ break;
+ }
+ case MFEMUL_INTREG_REST:{
+ mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, (uint8_t*)&ans);
+ if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
+ EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+ cardSTATE_TO_IDLE();
+ break;
+ }
+ cardSTATE = MFEMUL_WORK;
+ break;
+ }
+ }
+ button_pushed = BUTTON_PRESS();
+ }
+
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LEDsoff();
+
+ if(flags & FLAG_NR_AR_ATTACK && MF_DBGLEVEL >= 1) {
+ for ( uint8_t i = 0; i < ATTACK_KEY_COUNT; i++) {
+ if (ar_nr_collected[i] == 2) {
+ Dbprintf("Collected two pairs of AR/NR which can be used to extract %s from reader for sector %d:", (i<ATTACK_KEY_COUNT/2) ? "keyA" : "keyB", ar_nr_resp[i].sector);
+ Dbprintf("../tools/mfkey/mfkey32 %08x %08x %08x %08x %08x %08x",
+ ar_nr_resp[i].cuid, //UID
+ ar_nr_resp[i].nonce, //NT
+ ar_nr_resp[i].nr, //NR1
+ ar_nr_resp[i].ar, //AR1
+ ar_nr_resp[i].nr2, //NR2
+ ar_nr_resp[i].ar2 //AR2
+ );
+ }
+ }
+ for ( uint8_t i = ATTACK_KEY_COUNT; i < ATTACK_KEY_COUNT*2; i++) {
+ if (ar_nr_collected[i] == 2) {
+ Dbprintf("Collected two pairs of AR/NR which can be used to extract %s from reader for sector %d:", (i<ATTACK_KEY_COUNT/2) ? "keyA" : "keyB", ar_nr_resp[i].sector);
+ Dbprintf("../tools/mfkey/mfkey32v2 %08x %08x %08x %08x %08x %08x %08x",
+ ar_nr_resp[i].cuid, //UID
+ ar_nr_resp[i].nonce, //NT
+ ar_nr_resp[i].nr, //NR1
+ ar_nr_resp[i].ar, //AR1
+ ar_nr_resp[i].nonce2,//NT2
+ ar_nr_resp[i].nr2, //NR2
+ ar_nr_resp[i].ar2 //AR2
+ );
+ }
+ }
+ }
+ if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", get_tracing(), BigBuf_get_traceLen());
+
+ if(flags & FLAG_INTERACTIVE) { // Interactive mode flag, means we need to send ACK
+ //Send the collected ar_nr in the response
+ cmd_send(CMD_ACK,CMD_SIMULATE_MIFARE_CARD,button_pushed,0,&ar_nr_resp,sizeof(ar_nr_resp));
+ }
+}
projects / proxmark3-svn / commitdiff