// Routines to support ISO 14443 type A.
//-----------------------------------------------------------------------------
-#include "../include/proxmark3.h"
+#include "proxmark3.h"
#include "apps.h"
#include "util.h"
#include "string.h"
-#include "../common/cmd.h"
-#include "../common/iso14443crc.h"
+#include "cmd.h"
+#include "iso14443crc.h"
#include "iso14443a.h"
#include "crapto1.h"
#include "mifareutil.h"
-
+#include "BigBuf.h"
static uint32_t iso14a_timeout;
-uint8_t *trace = (uint8_t *) BigBuf+TRACE_OFFSET;
int rsamples = 0;
-int traceLen = 0;
-int tracing = TRUE;
uint8_t trigger = 0;
// the block number for the ISO14443-4 PCB
static uint8_t iso14_pcb_blocknum = 0;
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1
};
+
void iso14a_set_trigger(bool enable) {
trigger = enable;
}
-void iso14a_clear_trace() {
- memset(trace, 0x44, TRACE_SIZE);
- traceLen = 0;
-}
-
-void iso14a_set_tracing(bool enable) {
- tracing = enable;
-}
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) {
+
+ uint8_t tb1;
+ uint8_t fwi;
+ uint32_t fwt;
+
+ if (ats[0] > 1) { // there is a format byte T0
+ if ((ats[1] & 0x20) == 0x20) { // there is an interface byte TB(1)
+ if ((ats[1] & 0x10) == 0x10) { // there is an interface byte TA(1) preceding TB(1)
+ tb1 = ats[3];
+ } else {
+ tb1 = ats[2];
+ }
+ fwi = (tb1 & 0xf0) >> 4; // frame waiting indicator (FWI)
+ fwt = 256 * 16 * (1 << fwi); // frame waiting time (FWT) in 1/fc
+
+ iso14a_set_timeout(fwt/(8*16));
+ }
+ }
+}
+
+
//-----------------------------------------------------------------------------
// Generate the parity value for a byte sequence
//
return OddByteParity[bt];
}
-void GetParity(const uint8_t * pbtCmd, uint16_t iLen, uint8_t *par)
+void GetParity(const uint8_t *pbtCmd, uint16_t iLen, uint8_t *par)
{
uint16_t paritybit_cnt = 0;
uint16_t paritybyte_cnt = 0;
// Generate the parity bits
parityBits |= ((OddByteParity[pbtCmd[i]]) << (7-paritybit_cnt));
if (paritybit_cnt == 7) {
- par[paritybyte_cnt] = parityBits; // save 8 Bits parity
- parityBits = 0; // and advance to next Parity Byte
+ par[paritybyte_cnt] = parityBits; // save 8 Bits parity
+ parityBits = 0; // and advance to next Parity Byte
paritybyte_cnt++;
paritybit_cnt = 0;
} else {
- paritybit_cnt++;
+ paritybit_cnt++;
}
}
-
+
// save remaining parity bits
par[paritybyte_cnt] = parityBits;
ComputeCrc14443(CRC_14443_A,data,len,data+len,data+len+1);
}
-// The function LogTrace() is also used by the iClass implementation in iClass.c
-bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag)
+void AppendCrc14443b(uint8_t* data, int len)
{
- if (!tracing) return FALSE;
-
- uint16_t num_paritybytes = (iLen-1)/8 + 1; // number of valid paritybytes in *parity
- uint16_t duration = timestamp_end - timestamp_start;
-
- // Return when trace is full
- if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= TRACE_SIZE) {
- tracing = FALSE; // don't trace any more
- return FALSE;
- }
-
- // Traceformat:
- // 32 bits timestamp (little endian)
- // 16 bits duration (little endian)
- // 16 bits data length (little endian, Highest Bit used as readerToTag flag)
- // y Bytes data
- // x Bytes parity (one byte per 8 bytes data)
-
- // timestamp (start)
- trace[traceLen++] = ((timestamp_start >> 0) & 0xff);
- trace[traceLen++] = ((timestamp_start >> 8) & 0xff);
- trace[traceLen++] = ((timestamp_start >> 16) & 0xff);
- trace[traceLen++] = ((timestamp_start >> 24) & 0xff);
-
- // duration
- trace[traceLen++] = ((duration >> 0) & 0xff);
- trace[traceLen++] = ((duration >> 8) & 0xff);
-
- // data length
- trace[traceLen++] = ((iLen >> 0) & 0xff);
- trace[traceLen++] = ((iLen >> 8) & 0xff);
-
- // readerToTag flag
- if (!readerToTag) {
- trace[traceLen - 1] |= 0x80;
- }
-
- // data bytes
- if (btBytes != NULL && iLen != 0) {
- memcpy(trace + traceLen, btBytes, iLen);
- }
- traceLen += iLen;
-
- // parity bytes
- if (parity != NULL && iLen != 0) {
- memcpy(trace + traceLen, parity, num_paritybytes);
- }
- traceLen += num_paritybytes;
-
- return TRUE;
+ ComputeCrc14443(CRC_14443_B,data,len,data+len,data+len+1);
}
+
//=============================================================================
// ISO 14443 Type A - Miller decoder
//=============================================================================
static tUart Uart;
// Lookup-Table to decide if 4 raw bits are a modulation.
-// We accept two or three consecutive "0" in any position with the rest "1"
+// We accept the following:
+// 0001 - a 3 tick wide pause
+// 0011 - a 2 tick wide pause, or a three tick wide pause shifted left
+// 0111 - a 2 tick wide pause shifted left
+// 1001 - a 2 tick wide pause shifted right
const bool Mod_Miller_LUT[] = {
- TRUE, TRUE, FALSE, TRUE, FALSE, FALSE, FALSE, FALSE,
- TRUE, TRUE, FALSE, FALSE, TRUE, FALSE, FALSE, FALSE
+ FALSE, TRUE, FALSE, TRUE, FALSE, FALSE, FALSE, TRUE,
+ FALSE, TRUE, FALSE, FALSE, FALSE, FALSE, FALSE, FALSE
};
-#define IsMillerModulationNibble1(b) (Mod_Miller_LUT[(b & 0x00F0) >> 4])
-#define IsMillerModulationNibble2(b) (Mod_Miller_LUT[(b & 0x000F)])
+#define IsMillerModulationNibble1(b) (Mod_Miller_LUT[(b & 0x000000F0) >> 4])
+#define IsMillerModulationNibble2(b) (Mod_Miller_LUT[(b & 0x0000000F)])
void UartReset()
{
Uart.parityLen = 0; // number of decoded parity bytes
Uart.shiftReg = 0; // shiftreg to hold decoded data bits
Uart.parityBits = 0; // holds 8 parity bits
- Uart.twoBits = 0x0000; // buffer for 2 Bits
- Uart.highCnt = 0;
Uart.startTime = 0;
Uart.endTime = 0;
+
+ Uart.byteCntMax = 0;
+ Uart.posCnt = 0;
+ Uart.syncBit = 9999;
}
void UartInit(uint8_t *data, uint8_t *parity)
{
Uart.output = data;
Uart.parity = parity;
+ Uart.fourBits = 0x00000000; // clear the buffer for 4 Bits
UartReset();
}
static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time)
{
- Uart.twoBits = (Uart.twoBits << 8) | bit;
+ Uart.fourBits = (Uart.fourBits << 8) | bit;
if (Uart.state == STATE_UNSYNCD) { // not yet synced
- if (Uart.highCnt < 7) { // wait for a stable unmodulated signal
- if (Uart.twoBits == 0xffff)
- Uart.highCnt++;
- else
- Uart.highCnt = 0;
- } else {
- Uart.syncBit = 0xFFFF; // not set
- // look for 00xx1111 (the start bit)
- if ((Uart.twoBits & 0x6780) == 0x0780) Uart.syncBit = 7;
- else if ((Uart.twoBits & 0x33C0) == 0x03C0) Uart.syncBit = 6;
- else if ((Uart.twoBits & 0x19E0) == 0x01E0) Uart.syncBit = 5;
- else if ((Uart.twoBits & 0x0CF0) == 0x00F0) Uart.syncBit = 4;
- else if ((Uart.twoBits & 0x0678) == 0x0078) Uart.syncBit = 3;
- else if ((Uart.twoBits & 0x033C) == 0x003C) Uart.syncBit = 2;
- else if ((Uart.twoBits & 0x019E) == 0x001E) Uart.syncBit = 1;
- else if ((Uart.twoBits & 0x00CF) == 0x000F) Uart.syncBit = 0;
- if (Uart.syncBit != 0xFFFF) {
+ Uart.syncBit = 9999; // not set
+
+ // 00x11111 2|3 ticks pause followed by 6|5 ticks unmodulated Sequence Z (a "0" or "start of communication")
+ // 11111111 8 ticks unmodulation Sequence Y (a "0" or "end of communication" or "no information")
+ // 111100x1 4 ticks unmodulated followed by 2|3 ticks pause Sequence X (a "1")
+
+ // The start bit is one ore more Sequence Y followed by a Sequence Z (... 11111111 00x11111). We need to distinguish from
+ // Sequence X followed by Sequence Y followed by Sequence Z (111100x1 11111111 00x11111)
+ // we therefore look for a ...xx1111 11111111 00x11111xxxxxx... pattern
+ // (12 '1's followed by 2 '0's, eventually followed by another '0', followed by 5 '1's)
+ //
+#define ISO14443A_STARTBIT_MASK 0x07FFEF80 // mask is 00001111 11111111 1110 1111 10000000
+#define ISO14443A_STARTBIT_PATTERN 0x07FF8F80 // pattern is 00001111 11111111 1000 1111 10000000
+
+ if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 0)) == ISO14443A_STARTBIT_PATTERN >> 0) Uart.syncBit = 7;
+ else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 1)) == ISO14443A_STARTBIT_PATTERN >> 1) Uart.syncBit = 6;
+ else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 2)) == ISO14443A_STARTBIT_PATTERN >> 2) Uart.syncBit = 5;
+ else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 3)) == ISO14443A_STARTBIT_PATTERN >> 3) Uart.syncBit = 4;
+ else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 4)) == ISO14443A_STARTBIT_PATTERN >> 4) Uart.syncBit = 3;
+ else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 5)) == ISO14443A_STARTBIT_PATTERN >> 5) Uart.syncBit = 2;
+ else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 6)) == ISO14443A_STARTBIT_PATTERN >> 6) Uart.syncBit = 1;
+ else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 7)) == ISO14443A_STARTBIT_PATTERN >> 7) Uart.syncBit = 0;
+
+ if (Uart.syncBit != 9999) { // found a sync bit
Uart.startTime = non_real_time?non_real_time:(GetCountSspClk() & 0xfffffff8);
Uart.startTime -= Uart.syncBit;
Uart.endTime = Uart.startTime;
Uart.state = STATE_START_OF_COMMUNICATION;
}
- }
} else {
- if (IsMillerModulationNibble1(Uart.twoBits >> Uart.syncBit)) {
- if (IsMillerModulationNibble2(Uart.twoBits >> Uart.syncBit)) { // Modulation in both halves - error
+ if (IsMillerModulationNibble1(Uart.fourBits >> Uart.syncBit)) {
+ if (IsMillerModulationNibble2(Uart.fourBits >> Uart.syncBit)) { // Modulation in both halves - error
UartReset();
- Uart.highCnt = 6;
} else { // Modulation in first half = Sequence Z = logic "0"
if (Uart.state == STATE_MILLER_X) { // error - must not follow after X
UartReset();
- Uart.highCnt = 6;
} else {
Uart.bitCount++;
Uart.shiftReg = (Uart.shiftReg >> 1); // add a 0 to the shiftreg
Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit
Uart.bitCount = 0;
Uart.shiftReg = 0;
- if((Uart.len & 0x0007) == 0) { // every 8 data bytes
- Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits
- Uart.parityBits = 0;
+ if((Uart.len&0x0007) == 0) { // every 8 data bytes
+ Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits
+ Uart.parityBits = 0;
}
}
}
}
} else {
- if (IsMillerModulationNibble2(Uart.twoBits >> Uart.syncBit)) { // Modulation second half = Sequence X = logic "1"
+ if (IsMillerModulationNibble2(Uart.fourBits >> Uart.syncBit)) { // Modulation second half = Sequence X = logic "1"
Uart.bitCount++;
Uart.shiftReg = (Uart.shiftReg >> 1) | 0x100; // add a 1 to the shiftreg
Uart.state = STATE_MILLER_X;
Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit
Uart.bitCount = 0;
Uart.shiftReg = 0;
- if ((Uart.len & 0x0007) == 0) { // every 8 data bytes
- Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits
+ if ((Uart.len&0x0007) == 0) { // every 8 data bytes
+ Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits
Uart.parityBits = 0;
}
}
} else { // no modulation in both halves - Sequence Y
if (Uart.state == STATE_MILLER_Z || Uart.state == STATE_MILLER_Y) { // Y after logic "0" - End of Communication
Uart.state = STATE_UNSYNCD;
- Uart.bitCount--; // last "0" was part of EOC sequence
- Uart.shiftReg <<= 1; // drop it
- if(Uart.bitCount > 0) { // if we decoded some bits
- Uart.shiftReg >>= (9 - Uart.bitCount); // right align them
- Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); // add last byte to the output
- Uart.parityBits <<= 1; // add a (void) parity bit
- Uart.parityBits <<= (8 - (Uart.len & 0x0007)); // left align parity bits
- Uart.parity[Uart.parityLen++] = Uart.parityBits; // and store it
- return TRUE;
- } else if (Uart.len & 0x0007) { // there are some parity bits to store
- Uart.parityBits <<= (8 - (Uart.len & 0x0007)); // left align remaining parity bits
- Uart.parity[Uart.parityLen++] = Uart.parityBits; // and store them
- return TRUE; // we are finished with decoding the raw data sequence
+ Uart.bitCount--; // last "0" was part of EOC sequence
+ Uart.shiftReg <<= 1; // drop it
+ if(Uart.bitCount > 0) { // if we decoded some bits
+ Uart.shiftReg >>= (9 - Uart.bitCount); // right align them
+ Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); // add last byte to the output
+ Uart.parityBits <<= 1; // add a (void) parity bit
+ Uart.parityBits <<= (8 - (Uart.len&0x0007)); // left align parity bits
+ Uart.parity[Uart.parityLen++] = Uart.parityBits; // and store it
+ return TRUE;
+ } else if (Uart.len & 0x0007) { // there are some parity bits to store
+ Uart.parityBits <<= (8 - (Uart.len&0x0007)); // left align remaining parity bits
+ Uart.parity[Uart.parityLen++] = Uart.parityBits; // and store them
+ }
+ if (Uart.len) {
+ return TRUE; // we are finished with decoding the raw data sequence
+ } else {
+ UartReset(); // Nothing received - start over
}
}
if (Uart.state == STATE_START_OF_COMMUNICATION) { // error - must not follow directly after SOC
UartReset();
- Uart.highCnt = 6;
} else { // a logic "0"
Uart.bitCount++;
Uart.shiftReg = (Uart.shiftReg >> 1); // add a 0 to the shiftreg
Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit
Uart.bitCount = 0;
Uart.shiftReg = 0;
- if ((Uart.len & 0x0007) == 0) { // every 8 data bytes
- Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits
+ if ((Uart.len&0x0007) == 0) { // every 8 data bytes
+ Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits
Uart.parityBits = 0;
}
}
}
}
- }
+ }
return FALSE; // not finished yet, need more data
}
Demod.highCnt = 0;
Demod.startTime = 0;
Demod.endTime = 0;
+
+ //
+ Demod.bitCount = 0;
+ Demod.syncBit = 0xFFFF;
+ Demod.samples = 0;
}
void DemodInit(uint8_t *data, uint8_t *parity)
Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit
Demod.bitCount = 0;
Demod.shiftReg = 0;
- if((Demod.len & 0x0007) == 0) { // every 8 data bytes
- Demod.parity[Demod.parityLen++] = Demod.parityBits; // store 8 parity bits
+ if((Demod.len&0x0007) == 0) { // every 8 data bytes
+ Demod.parity[Demod.parityLen++] = Demod.parityBits; // store 8 parity bits
Demod.parityBits = 0;
}
}
Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit
Demod.bitCount = 0;
Demod.shiftReg = 0;
- if ((Demod.len & 0x0007) == 0) { // every 8 data bytes
- Demod.parity[Demod.parityLen++] = Demod.parityBits; // store 8 parity bits1
+ if ((Demod.len&0x0007) == 0) { // every 8 data bytes
+ Demod.parity[Demod.parityLen++] = Demod.parityBits; // store 8 parity bits1
Demod.parityBits = 0;
}
}
Demod.endTime = Demod.startTime + 8*(9*Demod.len + Demod.bitCount + 1);
} else { // no modulation in both halves - End of communication
- if(Demod.bitCount > 0) { // there are some remaining data bits
- Demod.shiftReg >>= (9 - Demod.bitCount); // right align the decoded bits
- Demod.output[Demod.len++] = Demod.shiftReg & 0xff; // and add them to the output
- Demod.parityBits <<= 1; // add a (void) parity bit
- Demod.parityBits <<= (8 - (Demod.len & 0x0007)); // left align remaining parity bits
- Demod.parity[Demod.parityLen++] = Demod.parityBits; // and store them
- return TRUE;
- } else if (Demod.len & 0x0007) { // there are some parity bits to store
- Demod.parityBits <<= (8 - (Demod.len & 0x0007)); // left align remaining parity bits
- Demod.parity[Demod.parityLen++] = Demod.parityBits; // and store them
- return TRUE; // we are finished with decoding the raw data sequence
+ if(Demod.bitCount > 0) { // there are some remaining data bits
+ Demod.shiftReg >>= (9 - Demod.bitCount); // right align the decoded bits
+ Demod.output[Demod.len++] = Demod.shiftReg & 0xff; // and add them to the output
+ Demod.parityBits <<= 1; // add a (void) parity bit
+ Demod.parityBits <<= (8 - (Demod.len&0x0007)); // left align remaining parity bits
+ Demod.parity[Demod.parityLen++] = Demod.parityBits; // and store them
+ return TRUE;
+ } else if (Demod.len & 0x0007) { // there are some parity bits to store
+ Demod.parityBits <<= (8 - (Demod.len&0x0007)); // left align remaining parity bits
+ Demod.parity[Demod.parityLen++] = Demod.parityBits; // and store them
+ }
+ if (Demod.len) {
+ return TRUE; // we are finished with decoding the raw data sequence
} else { // nothing received. Start over
DemodReset();
}
}
}
-
}
-
return FALSE; // not finished yet, need more data
}
// bit 1 - trigger from first reader 7-bit request
LEDsoff();
- // init trace buffer
- iso14a_clear_trace();
- iso14a_set_tracing(TRUE);
// 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
// triggered == FALSE -- to wait first for card
bool triggered = !(param & 0x03);
+ // Allocate memory from BigBuf for some buffers
+ // free all previous allocations first
+ BigBuf_free();
+
// The command (reader -> tag) that we're receiving.
- // The length of a received command will in most cases be no more than 18 bytes.
- // So 32 should be enough!
- uint8_t *receivedCmd = ((uint8_t *)BigBuf) + RECV_CMD_OFFSET;
- uint8_t *receivedCmdPar = ((uint8_t *)BigBuf) + RECV_CMD_PAR_OFFSET;
+ uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
+ uint8_t *receivedCmdPar = BigBuf_malloc(MAX_PARITY_SIZE);
// The response (tag -> reader) that we're receiving.
- uint8_t *receivedResponse = ((uint8_t *)BigBuf) + RECV_RESP_OFFSET;
- uint8_t *receivedResponsePar = ((uint8_t *)BigBuf) + RECV_RESP_PAR_OFFSET;
-
- // As we receive stuff, we copy it from receivedCmd or receivedResponse
- // into trace, along with its length and other annotations.
- //uint8_t *trace = (uint8_t *)BigBuf;
+ uint8_t *receivedResponse = BigBuf_malloc(MAX_FRAME_SIZE);
+ uint8_t *receivedResponsePar = BigBuf_malloc(MAX_PARITY_SIZE);
// The DMA buffer, used to stream samples from the FPGA
- uint8_t *dmaBuf = ((uint8_t *)BigBuf) + DMA_BUFFER_OFFSET;
+ uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
+
+ // init trace buffer
+ clear_trace();
+ set_tracing(TRUE);
+
uint8_t *data = dmaBuf;
uint8_t previous_data = 0;
int maxDataLen = 0;
// Set up the demodulator for tag -> reader responses.
DemodInit(receivedResponse, receivedResponsePar);
-
+
// Set up the demodulator for the reader -> tag commands
UartInit(receivedCmd, receivedCmdPar);
-
+
// Setup and start DMA.
FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
// test for length of buffer
if(dataLen > maxDataLen) {
maxDataLen = dataLen;
- if(dataLen > 400) {
+ if(dataLen > (9 * DMA_BUFFER_SIZE / 10)) {
Dbprintf("blew circular buffer! dataLen=%d", dataLen);
break;
}
if ((!triggered) && (param & 0x02) && (Uart.len == 1) && (Uart.bitCount == 7)) triggered = TRUE;
if(triggered) {
- if (!LogTrace(receivedCmd,
- Uart.len,
- Uart.startTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER,
- Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER,
- Uart.parity,
- TRUE)) break;
+ if (!LogTrace(receivedCmd,
+ Uart.len,
+ Uart.startTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER,
+ Uart.endTime*16 - DELAY_READER_AIR2ARM_AS_SNIFFER,
+ Uart.parity,
+ TRUE)) break;
}
/* And ready to receive another command. */
UartReset();
if(ManchesterDecoding(tagdata, 0, (rsamples-1)*4)) {
LED_B_ON();
- if (!LogTrace(receivedResponse,
- Demod.len,
- Demod.startTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER,
- Demod.endTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER,
- Demod.parity,
- FALSE)) break;
+ if (!LogTrace(receivedResponse,
+ Demod.len,
+ Demod.startTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER,
+ Demod.endTime*16 - DELAY_TAG_AIR2ARM_AS_SNIFFER,
+ Demod.parity,
+ FALSE)) break;
if ((!triggered) && (param & 0x01)) triggered = TRUE;
// And ready to receive another response.
DemodReset();
+ // And reset the Miller decoder including itS (now outdated) input buffer
+ UartInit(receivedCmd, receivedCmdPar);
+
LED_C_OFF();
}
TagIsActive = (Demod.state != DEMOD_UNSYNCD);
FpgaDisableSscDma();
Dbprintf("maxDataLen=%d, Uart.state=%x, Uart.len=%d", maxDataLen, Uart.state, Uart.len);
- Dbprintf("traceLen=%d, Uart.output[0]=%08x", traceLen, (uint32_t)Uart.output[0]);
+ Dbprintf("traceLen=%d, Uart.output[0]=%08x", BigBuf_get_traceLen(), (uint32_t)Uart.output[0]);
LEDsoff();
}
//-----------------------------------------------------------------------------
// Prepare tag messages
//-----------------------------------------------------------------------------
-static void CodeIso14443aAsTagPar(const uint8_t *cmd, uint16_t len, uint8_t *parity)
+static void CodeIso14443aAsTagPar(const uint8_t *cmd, uint16_t len, uint8_t *parity)
{
ToSendReset();
ToSend[++ToSendMax] = SEC_D;
LastProxToAirDuration = 8 * ToSendMax - 4;
- for( uint16_t i = 0; i < len; i++) {
+ for(uint16_t i = 0; i < len; i++) {
uint8_t b = cmd[i];
// Data bits
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 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
+static uint8_t* free_buffer_pointer;
typedef struct {
uint8_t* response;
uint32_t ProxToAirDuration;
} tag_response_info_t;
-void reset_free_buffer() {
- free_buffer_pointer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
-}
-
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
// ----------- +
// 166 bytes, since every bit that needs to be send costs us a byte
//
-
+
+
// Prepare the tag modulation bits from the message
CodeIso14443aAsTag(response_info->response,response_info->response_n);
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
+// -> need 273 bytes buffer
+#define ALLOCATED_TAG_MODULATION_BUFFER_SIZE 273
+
bool prepare_allocated_tag_modulation(tag_response_info_t* response_info) {
// 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 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + FREE_BUFFER_SIZE) - free_buffer_pointer;
+ size_t max_buffer_size = ALLOCATED_TAG_MODULATION_BUFFER_SIZE;
// Forward the prepare tag modulation function to the inner function
- if (prepare_tag_modulation(response_info,max_buffer_size)) {
+ if (prepare_tag_modulation(response_info, max_buffer_size)) {
// Update the free buffer offset
free_buffer_pointer += ToSendMax;
return true;
//-----------------------------------------------------------------------------
void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data)
{
- // Enable and clear the trace
- iso14a_clear_trace();
- iso14a_set_tracing(TRUE);
-
uint8_t sak;
// The first response contains the ATQA (note: bytes are transmitted in reverse order).
}
// The second response contains the (mandatory) first 24 bits of the UID
- uint8_t response2[5];
+ uint8_t response2[5] = {0x00};
// Check if the uid uses the (optional) part
- uint8_t response2a[5];
+ uint8_t response2a[5] = {0x00};
+
if (uid_2nd) {
response2[0] = 0x88;
num_to_bytes(uid_1st,3,response2+1);
response2[4] = response2[0] ^ response2[1] ^ response2[2] ^ response2[3];
// Prepare the mandatory SAK (for 4 and 7 byte UID)
- uint8_t response3[3];
+ uint8_t response3[3] = {0x00};
response3[0] = sak;
ComputeCrc14443(CRC_14443_A, response3, 1, &response3[1], &response3[2]);
// Prepare the optional second SAK (for 7 byte UID), drop the cascade bit
- uint8_t response3a[3];
+ uint8_t response3a[3] = {0x00};
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:
- // Format byte = 0x58: FSCI=0x08 (FSC=256), TA(1) and TC(1) present,
+ 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
.modulation_n = 0
};
- // Reset the offset pointer of the free buffer
- reset_free_buffer();
-
+ BigBuf_free_keep_EM();
+
+ // 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++) {
// We need to listen to the high-frequency, peak-detected path.
iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
- // buffers used on software Uart:
- uint8_t *receivedCmd = ((uint8_t *)BigBuf) + RECV_CMD_OFFSET;
- uint8_t *receivedCmdPar = ((uint8_t *)BigBuf) + RECV_CMD_PAR_OFFSET;
-
cmdsRecvd = 0;
tag_response_info_t* p_response;
if(!GetIso14443aCommandFromReader(receivedCmd, receivedCmdPar, &len)) {
DbpString("Button press");
- break;
+ break;
}
p_response = NULL;
Dbprintf("%x %x %x", happened, happened2, cmdsRecvd);
LED_A_OFF();
+ BigBuf_free_keep_EM();
}
}
}
- NextTransferTime = MAX(NextTransferTime, LastTimeProxToAirStart + REQUEST_GUARD_TIME);
+ NextTransferTime = MAX(NextTransferTime, LastTimeProxToAirStart + REQUEST_GUARD_TIME);
}
//-----------------------------------------------------------------------------
// 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)
+void CodeIso14443aBitsAsReaderPar(const uint8_t *cmd, uint16_t bits, const uint8_t *parity)
{
int i, j;
int last;
}
// Only transmit parity bit if we transmitted a complete byte
- if (j == 8) {
+ if (j == 8 && parity != NULL) {
// Get the parity bit
if (parity[i>>3] & (0x80 >> (i&0x0007))) {
// Sequence X
//-----------------------------------------------------------------------------
// 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)
// Set ADC to read field strength
AT91C_BASE_ADC->ADC_CR = AT91C_ADC_SWRST;
AT91C_BASE_ADC->ADC_MR =
- ADC_MODE_PRESCALE(32) |
- ADC_MODE_STARTUP_TIME(16) |
- ADC_MODE_SAMPLE_HOLD_TIME(8);
+ ADC_MODE_PRESCALE(63) |
+ ADC_MODE_STARTUP_TIME(1) |
+ ADC_MODE_SAMPLE_HOLD_TIME(15);
AT91C_BASE_ADC->ADC_CHER = ADC_CHANNEL(ADC_CHAN_HF);
// start ADC
AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
// Clear RXRDY:
uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
-
+
for(;;) {
WDT_HIT();
analogAVG += AT91C_BASE_ADC->ADC_CDR[ADC_CHAN_HF];
AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
if (analogCnt >= 32) {
- if ((33000 * (analogAVG / analogCnt) >> 10) < MF_MINFIELDV) {
+ if ((MAX_ADC_HF_VOLTAGE * (analogAVG / analogCnt) >> 10) < MF_MINFIELDV) {
vtime = GetTickCount();
if (!timer) timer = vtime;
// 50ms no field --> card to idle state
AT91C_BASE_SSC->SSC_THR = SEC_F;
// send cycle
- for(; i <= respLen; ) {
+ for(; i < respLen; ) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
AT91C_BASE_SSC->SSC_THR = resp[i++];
FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
}
// Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again:
- for (i = 0; i < 2 ; ) {
+ uint8_t fpga_queued_bits = FpgaSendQueueDelay >> 3;
+ for (i = 0; i <= fpga_queued_bits/8 + 1; ) {
if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
AT91C_BASE_SSC->SSC_THR = SEC_F;
FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
i++;
}
}
-
+
LastTimeProxToAirStart = ThisTransferTime + (correctionNeeded?8:0);
return 0;
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);
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) return true;
-
- // 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));
+ 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;
+ }
}
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
static int GetIso14443aAnswerFromTag(uint8_t *receivedResponse, uint8_t *receivedResponsePar, uint16_t offset)
{
- uint16_t c;
+ uint32_t c = 0x00;
// Set FPGA mode to "reader listen mode", no modulation (listen
// only, since we are receiving, not transmitting).
// Now get the answer from the card
DemodInit(receivedResponse, receivedResponsePar);
-
+
// clear RXRDY:
uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
-
- c = 0;
+
for(;;) {
WDT_HIT();
if(ManchesterDecoding(b, offset, 0)) {
NextTransferTime = MAX(NextTransferTime, Demod.endTime - (DELAY_AIR2ARM_AS_READER + DELAY_ARM2AIR_AS_READER)/16 + FRAME_DELAY_TIME_PICC_TO_PCD);
return TRUE;
- } else if (c++ > iso14a_timeout) {
+ } else if (c++ > iso14a_timeout && Demod.state == DEMOD_UNSYNCD) {
return FALSE;
}
}
}
}
+
void ReaderTransmitBitsPar(uint8_t* frame, uint16_t bits, uint8_t *par, uint32_t *timing)
{
CodeIso14443aBitsAsReaderPar(frame, bits, par);
}
}
+
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];
- GetParity(frame, len/8, par);
- ReaderTransmitBitsPar(frame, len, par, timing);
+ // Generate parity and redirect
+ uint8_t par[MAX_PARITY_SIZE];
+ 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];
- GetParity(frame, len, par);
- ReaderTransmitBitsPar(frame, len*8, par, timing);
+ // Generate parity and redirect
+ uint8_t par[MAX_PARITY_SIZE];
+ 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 (!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 ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity)
{
if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, 0)) return FALSE;
-
if (tracing) {
LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE);
}
/* performs iso14443a anticollision procedure
* fills the uid pointer unless NULL
* fills resp_data unless NULL */
-int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, uint32_t* cuid_ptr) {
- //uint8_t halt[] = { 0x50 }; // HALT
- uint8_t wupa[] = { 0x52 }; // WAKE-UP
- //uint8_t reqa[] = { 0x26 }; // REQUEST A
+int iso14443a_select_card(byte_t *uid_ptr, iso14a_card_select_t *p_hi14a_card, uint32_t *cuid_ptr) {
+ uint8_t wupa[] = { 0x52 }; // 0x26 - REQA 0x52 - WAKE-UP
uint8_t sel_all[] = { 0x93,0x20 };
uint8_t sel_uid[] = { 0x93,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
uint8_t rats[] = { 0xE0,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0
- uint8_t *resp = ((uint8_t *)BigBuf) + RECV_RESP_OFFSET;
- uint8_t *resp_par = ((uint8_t *)BigBuf) + RECV_RESP_PAR_OFFSET;
-
+ uint8_t resp[MAX_FRAME_SIZE]; // theoretically. A usual RATS will be much smaller
+ uint8_t resp_par[MAX_PARITY_SIZE];
byte_t uid_resp[4];
size_t uid_resp_len;
+
uint8_t sak = 0x04; // cascade uid
int cascade_level = 0;
int len;
-
- // test for the SKYLANDERS TOY.
- //ReaderTransmit(halt,sizeof(halt), NULL);
-
+
// Broadcast for a card, WUPA (0x52) will force response from all cards in the field
- ReaderTransmitBitsPar(wupa,7,0, NULL);
+ ReaderTransmitBitsPar(wupa,7,0, NULL);
// Receive the ATQA
if(!ReaderReceive(resp, resp_par)) return 0;
-
+
if(p_hi14a_card) {
memcpy(p_hi14a_card->atqa, resp, 2);
p_hi14a_card->uidlen = 0;
memset(uid_ptr,0,10);
}
- // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in
- // which case we need to make a cascade 2 request and select - this is a long UID
- // While the UID is not complete, the 3nd bit (from the right) is set in the SAK.
- for(; sak & 0x04; cascade_level++) {
- // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97)
- sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2;
-
- // SELECT_ALL
- ReaderTransmit(sel_all,sizeof(sel_all), NULL);
- if (!ReaderReceive(resp, resp_par)) return 0;
-
- if (Demod.collisionPos) { // we had a collision and need to construct the UID bit by bit
- memset(uid_resp, 0, 4);
- uint16_t uid_resp_bits = 0;
- uint16_t collision_answer_offset = 0;
- // anti-collision-loop:
- while (Demod.collisionPos) {
- Dbprintf("Multiple tags detected. Collision after Bit %d", Demod.collisionPos);
- for (uint16_t i = collision_answer_offset; i < Demod.collisionPos; i++, uid_resp_bits++) { // add valid UID bits before collision point
- uint16_t UIDbit = (resp[i/8] >> (i % 8)) & 0x01;
- uid_resp[uid_resp_bits & 0xf8] |= UIDbit << (uid_resp_bits % 8);
+ // check for proprietary anticollision:
+ if ((resp[0] & 0x1F) == 0) {
+ return 3;
+ }
+
+ // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in
+ // which case we need to make a cascade 2 request and select - this is a long UID
+ // While the UID is not complete, the 3nd bit (from the right) is set in the SAK.
+ for(; sak & 0x04; cascade_level++) {
+ // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97)
+ sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2;
+
+ // SELECT_ALL
+ ReaderTransmit(sel_all, sizeof(sel_all), NULL);
+ if (!ReaderReceive(resp, resp_par)) return 0;
+
+ if (Demod.collisionPos) { // we had a collision and need to construct the UID bit by bit
+ memset(uid_resp, 0, 4);
+ uint16_t uid_resp_bits = 0;
+ uint16_t collision_answer_offset = 0;
+ // anti-collision-loop:
+ while (Demod.collisionPos) {
+ Dbprintf("Multiple tags detected. Collision after Bit %d", Demod.collisionPos);
+ for (uint16_t i = collision_answer_offset; i < Demod.collisionPos; i++, uid_resp_bits++) { // add valid UID bits before collision point
+ uint16_t UIDbit = (resp[i/8] >> (i % 8)) & 0x01;
+ uid_resp[uid_resp_bits / 8] |= UIDbit << (uid_resp_bits % 8);
+ }
+ uid_resp[uid_resp_bits/8] |= 1 << (uid_resp_bits % 8); // next time select the card(s) with a 1 in the collision position
+ uid_resp_bits++;
+ // construct anticollosion command:
+ sel_uid[1] = ((2 + uid_resp_bits/8) << 4) | (uid_resp_bits & 0x07); // length of data in bytes and bits
+ for (uint16_t i = 0; i <= uid_resp_bits/8; i++) {
+ sel_uid[2+i] = uid_resp[i];
+ }
+ collision_answer_offset = uid_resp_bits%8;
+ ReaderTransmitBits(sel_uid, 16 + uid_resp_bits, NULL);
+ if (!ReaderReceiveOffset(resp, collision_answer_offset, resp_par)) return 0;
}
- uid_resp[uid_resp_bits/8] |= 1 << (uid_resp_bits % 8); // next time select the card(s) with a 1 in the collision position
- uid_resp_bits++;
- // construct anticollosion command:
- sel_uid[1] = ((2 + uid_resp_bits/8) << 4) | (uid_resp_bits & 0x07); // length of data in bytes and bits
- for (uint16_t i = 0; i <= uid_resp_bits/8; i++) {
- sel_uid[2+i] = uid_resp[i];
+ // finally, add the last bits and BCC of the UID
+ for (uint16_t i = collision_answer_offset; i < (Demod.len-1)*8; i++, uid_resp_bits++) {
+ uint16_t UIDbit = (resp[i/8] >> (i%8)) & 0x01;
+ uid_resp[uid_resp_bits/8] |= UIDbit << (uid_resp_bits % 8);
}
- collision_answer_offset = uid_resp_bits%8;
- ReaderTransmitBits(sel_uid, 16 + uid_resp_bits, NULL);
- if (!ReaderReceiveOffset(resp, collision_answer_offset,resp_par)) return 0;
- }
- // finally, add the last bits and BCC of the UID
- for (uint16_t i = collision_answer_offset; i < (Demod.len-1)*8; i++, uid_resp_bits++) {
- uint16_t UIDbit = (resp[i/8] >> (i%8)) & 0x01;
- uid_resp[uid_resp_bits/8] |= UIDbit << (uid_resp_bits % 8);
- }
- } else { // no collision, use the response to SELECT_ALL as current uid
- memcpy(uid_resp,resp,4);
- }
- uid_resp_len = 4;
+ } else { // no collision, use the response to SELECT_ALL as current uid
+ memcpy(uid_resp, resp, 4);
+ }
+ uid_resp_len = 4;
- // calculate crypto UID. Always use last 4 Bytes.
- if(cuid_ptr) {
- *cuid_ptr = bytes_to_num(uid_resp, 4);
- }
+ // calculate crypto UID. Always use last 4 Bytes.
+ if(cuid_ptr) {
+ *cuid_ptr = bytes_to_num(uid_resp, 4);
+ }
- // Construct SELECT UID command
- sel_uid[1] = 0x70; // transmitting a full UID (1 Byte cmd, 1 Byte NVB, 4 Byte UID, 1 Byte BCC, 2 Bytes CRC)
- memcpy(sel_uid+2,uid_resp,4); // the UID
- sel_uid[6] = sel_uid[2] ^ sel_uid[3] ^ sel_uid[4] ^ sel_uid[5]; // calculate and add BCC
- AppendCrc14443a(sel_uid,7); // calculate and add CRC
- ReaderTransmit(sel_uid,sizeof(sel_uid), NULL);
+ // Construct SELECT UID command
+ sel_uid[1] = 0x70; // transmitting a full UID (1 Byte cmd, 1 Byte NVB, 4 Byte UID, 1 Byte BCC, 2 Bytes CRC)
+ memcpy(sel_uid+2, uid_resp, 4); // the UID
+ sel_uid[6] = sel_uid[2] ^ sel_uid[3] ^ sel_uid[4] ^ sel_uid[5]; // calculate and add BCC
+ AppendCrc14443a(sel_uid, 7); // calculate and add CRC
+ ReaderTransmit(sel_uid, sizeof(sel_uid), NULL);
- // Receive the SAK
- if (!ReaderReceive(resp, resp_par)) return 0;
- sak = resp[0];
+ // Receive the SAK
+ if (!ReaderReceive(resp, resp_par)) return 0;
+ sak = resp[0];
-
// Test if more parts of the uid are coming
- if ((sak & 0x04) /* && uid_resp[0] == 0x88 */) {
- // Remove first byte, 0x88 is not an UID byte, it CT, see page 3 of:
- // http://www.nxp.com/documents/application_note/AN10927.pdf
- uid_resp[0] = uid_resp[1];
- uid_resp[1] = uid_resp[2];
- uid_resp[2] = uid_resp[3];
-
- uid_resp_len = 3;
- }
-
- if(uid_ptr) {
- memcpy(uid_ptr + (cascade_level*3), uid_resp, uid_resp_len);
- }
+ if ((sak & 0x04) /* && uid_resp[0] == 0x88 */) {
+ // Remove first byte, 0x88 is not an UID byte, it CT, see page 3 of:
+ // http://www.nxp.com/documents/application_note/AN10927.pdf
+ uid_resp[0] = uid_resp[1];
+ uid_resp[1] = uid_resp[2];
+ uid_resp[2] = uid_resp[3];
+
+ uid_resp_len = 3;
+ }
- if(p_hi14a_card) {
- memcpy(p_hi14a_card->uid + (cascade_level*3), uid_resp, uid_resp_len);
- p_hi14a_card->uidlen += uid_resp_len;
- }
- }
+ if(uid_ptr) {
+ memcpy(uid_ptr + (cascade_level*3), uid_resp, uid_resp_len);
+ }
- if(p_hi14a_card) {
- p_hi14a_card->sak = sak;
- p_hi14a_card->ats_len = 0;
- }
+ if(p_hi14a_card) {
+ memcpy(p_hi14a_card->uid + (cascade_level*3), uid_resp, uid_resp_len);
+ p_hi14a_card->uidlen += uid_resp_len;
+ }
+ }
- if( (sak & 0x20) == 0) {
- return 2; // non iso14443a compliant tag
+ if(p_hi14a_card) {
+ p_hi14a_card->sak = sak;
+ p_hi14a_card->ats_len = 0;
}
+ // non iso14443a compliant tag
+ if( (sak & 0x20) == 0) return 2;
+
// Request for answer to select
AppendCrc14443a(rats, 2);
ReaderTransmit(rats, sizeof(rats), NULL);
- if (!(len = ReaderReceive(resp, resp_par))) return 2;
+ if (!(len = ReaderReceive(resp, resp_par))) return 0;
+
if(p_hi14a_card) {
memcpy(p_hi14a_card->ats, resp, sizeof(p_hi14a_card->ats));
p_hi14a_card->ats_len = len;
// reset the PCB block number
iso14_pcb_blocknum = 0;
- return 1;
+
+ // set default timeout based on ATS
+ iso14a_set_ATS_timeout(resp);
+
+ return 1;
}
void iso14443a_setup(uint8_t fpga_minor_mode) {
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
// Signal field is on with the appropriate LED
- if (fpga_minor_mode == FPGA_HF_ISO14443A_READER_MOD || fpga_minor_mode == FPGA_HF_ISO14443A_READER_LISTEN) {
+ if (fpga_minor_mode == FPGA_HF_ISO14443A_READER_MOD
+ || fpga_minor_mode == FPGA_HF_ISO14443A_READER_LISTEN) {
LED_D_ON();
} else {
LED_D_OFF();
DemodReset();
UartReset();
NextTransferTime = 2*DELAY_ARM2AIR_AS_READER;
- iso14a_set_timeout(1050); // 10ms default 10*105 =
+ iso14a_set_timeout(10*106); // 10ms default
}
int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) {
ReaderTransmit(real_cmd, cmd_len+4, NULL);
size_t len = ReaderReceive(data, parity);
- uint8_t * data_bytes = (uint8_t *) data;
+ uint8_t *data_bytes = (uint8_t *) data;
if (!len)
return 0; //DATA LINK ERROR
// if we received an I- or R(ACK)-Block with a block number equal to the
{
iso14a_command_t param = c->arg[0];
uint8_t *cmd = c->d.asBytes;
- size_t len = c->arg[1];
- size_t lenbits = c->arg[2];
+ size_t len = c->arg[1] & 0xffff;
+ size_t lenbits = c->arg[1] >> 16;
+ uint32_t timeout = c->arg[2];
uint32_t arg0 = 0;
byte_t buf[USB_CMD_DATA_SIZE];
uint8_t par[MAX_PARITY_SIZE];
if(param & ISO14A_CONNECT) {
- iso14a_clear_trace();
+ clear_trace();
}
- iso14a_set_tracing(TRUE);
+ set_tracing(TRUE);
if(param & ISO14A_REQUEST_TRIGGER) {
iso14a_set_trigger(TRUE);
}
if(param & ISO14A_SET_TIMEOUT) {
- iso14a_set_timeout(c->arg[2]);
+ iso14a_set_timeout(timeout);
}
if(param & ISO14A_APDU) {
if(param & ISO14A_RAW) {
if(param & ISO14A_APPEND_CRC) {
+ if(param & ISO14A_TOPAZMODE) {
+ AppendCrc14443b(cmd,len);
+ } else {
AppendCrc14443a(cmd,len);
+ }
len += 2;
if (lenbits) lenbits += 16;
}
- if(lenbits>0) {
- GetParity(cmd, lenbits/8, par);
- ReaderTransmitBitsPar(cmd, lenbits, par, NULL);
+ if(lenbits>0) { // want to send a specific number of bits (e.g. short commands)
+ if(param & ISO14A_TOPAZMODE) {
+ int bits_to_send = lenbits;
+ uint16_t i = 0;
+ ReaderTransmitBitsPar(&cmd[i++], MIN(bits_to_send, 7), NULL, NULL); // first byte is always short (7bits) and no parity
+ bits_to_send -= 7;
+ while (bits_to_send > 0) {
+ ReaderTransmitBitsPar(&cmd[i++], MIN(bits_to_send, 8), NULL, NULL); // following bytes are 8 bit and no parity
+ bits_to_send -= 8;
+ }
+ } else {
+ GetParity(cmd, lenbits/8, par);
+ ReaderTransmitBitsPar(cmd, lenbits, par, NULL); // bytes are 8 bit with odd parity
+ }
+ } else { // want to send complete bytes only
+ if(param & ISO14A_TOPAZMODE) {
+ uint16_t i = 0;
+ ReaderTransmitBitsPar(&cmd[i++], 7, NULL, NULL); // first byte: 7 bits, no paritiy
+ while (i < len) {
+ ReaderTransmitBitsPar(&cmd[i++], 8, NULL, NULL); // following bytes: 8 bits, no paritiy
+ }
} else {
- ReaderTransmit(cmd,len, NULL);
+ ReaderTransmit(cmd,len, NULL); // 8 bits, odd parity
+ }
}
arg0 = ReaderReceive(buf, par);
cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf));
uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
static uint8_t mf_nr_ar3;
- uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
- uint8_t* receivedAnswerPar = (((uint8_t *)BigBuf) + RECV_RESP_PAR_OFFSET);
+ uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE];
+ uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE];
- iso14a_clear_trace();
- iso14a_set_tracing(TRUE);
+ // free eventually allocated BigBuf memory. We want all for tracing.
+ BigBuf_free();
+
+ clear_trace();
+ set_tracing(TRUE);
byte_t nt_diff = 0;
uint8_t par[1] = {0}; // maximum 8 Bytes to be sent here, 1 byte parity is therefore enough
led_on = !led_on;
if(led_on) LED_B_ON(); else LED_B_OFF();
- par_list[nt_diff] = SwapBits(par[0], 8);
+ par_list[nt_diff] = SwapBits(par[0], 8);
ks_list[nt_diff] = receivedAnswer[0] ^ 0x05;
// Test if the information is complete
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
LEDsoff();
- iso14a_set_tracing(FALSE);
+ set_tracing(FALSE);
}
/**
struct Crypto1State *pcs;
pcs = &mpcs;
uint32_t numReads = 0;//Counts numer of times reader read a block
- uint8_t* receivedCmd = get_bigbufptr_recvcmdbuf();
- uint8_t* receivedCmd_par = receivedCmd + MAX_FRAME_SIZE;
- uint8_t* response = get_bigbufptr_recvrespbuf();
- uint8_t* response_par = response + MAX_FRAME_SIZE;
+ 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};
uint32_t ar_nr_responses[] = {0,0,0,0,0,0,0,0};
uint8_t ar_nr_collected = 0;
+ // free eventually allocated BigBuf memory but keep Emulator Memory
+ BigBuf_free_keep_EM();
+
// clear trace
- iso14a_clear_trace();
- iso14a_set_tracing(TRUE);
+ clear_trace();
+ set_tracing(TRUE);
// Authenticate response - nonce
uint32_t nonce = bytes_to_num(rAUTH_NT, 4);
WDT_HIT();
// find reader field
- // Vref = 3300mV, and an 10:1 voltage divider on the input
- // can measure voltages up to 33000 mV
if (cardSTATE == MFEMUL_NOFIELD) {
- vHf = (33000 * AvgAdc(ADC_CHAN_HF)) >> 10;
+ vHf = (MAX_ADC_HF_VOLTAGE * AvgAdc(ADC_CHAN_HF)) >> 10;
if (vHf > MF_MINFIELDV) {
cardSTATE_TO_IDLE();
LED_A_ON();
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 ar = bytes_to_num(receivedCmd, 4);
uint32_t nr = bytes_to_num(&receivedCmd[4], 4);
//Collect AR/NR
- if(ar_nr_collected < 2){
+ if(ar_nr_collected < 2 && cardAUTHSC == 2){
if(ar_nr_responses[2] != ar)
{// Avoid duplicates... probably not necessary, ar should vary.
ar_nr_responses[ar_nr_collected*4] = cuid;
ar_nr_responses[ar_nr_collected*4+2] = ar;
ar_nr_responses[ar_nr_collected*4+3] = nr;
ar_nr_collected++;
+ }
+ // Interactive mode flag, means we need to send ACK
+ if(flags & FLAG_INTERACTIVE && ar_nr_collected == 2)
+ {
+ finished = true;
}
}
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;
mf_crypto1_encrypt(pcs, response, 18, response_par);
EmSendCmdPar(response, 18, response_par);
numReads++;
- if(exitAfterNReads > 0 && numReads == exitAfterNReads) {
+ if(exitAfterNReads > 0 && numReads >= exitAfterNReads) {
Dbprintf("%d reads done, exiting", numReads);
finished = true;
}
if(flags & FLAG_INTERACTIVE)// Interactive mode flag, means we need to send ACK
{
//May just aswell send the collected ar_nr in the response aswell
- cmd_send(CMD_ACK,CMD_SIMULATE_MIFARE_CARD,0,0,&ar_nr_responses,ar_nr_collected*4*4);
+ cmd_send(CMD_ACK,CMD_SIMULATE_MIFARE_CARD,1,0,&ar_nr_responses,ar_nr_collected*4*4);
}
- if(flags & FLAG_NR_AR_ATTACK)
+ if(flags & FLAG_NR_AR_ATTACK && MF_DBGLEVEL >= 1 )
{
- if(ar_nr_collected > 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 %08x %08x %08x %08x %08x %08x",
- ar_nr_responses[0], // UID
+ ar_nr_responses[0], // UID
ar_nr_responses[1], //NT
ar_nr_responses[2], //AR1
ar_nr_responses[3], //NR1
);
} else {
Dbprintf("Failed to obtain two AR/NR pairs!");
- if(ar_nr_collected >0) {
+ if(ar_nr_collected > 0 ) {
Dbprintf("Only got these: UID=%08x, nonce=%08x, AR1=%08x, NR1=%08x",
ar_nr_responses[0], // UID
ar_nr_responses[1], //NT
}
}
}
- if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, traceLen);
+ if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, BigBuf_get_traceLen());
+
}
// C(red) A(yellow) B(green)
LEDsoff();
// init trace buffer
- iso14a_clear_trace();
- iso14a_set_tracing(TRUE);
+ clear_trace();
+ set_tracing(TRUE);
// The command (reader -> tag) that we're receiving.
// The length of a received command will in most cases be no more than 18 bytes.
// So 32 should be enough!
- uint8_t *receivedCmd = (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);
- uint8_t *receivedCmdPar = ((uint8_t *)BigBuf) + RECV_CMD_PAR_OFFSET;
+ uint8_t receivedCmd[MAX_MIFARE_FRAME_SIZE];
+ uint8_t receivedCmdPar[MAX_MIFARE_PARITY_SIZE];
// The response (tag -> reader) that we're receiving.
- uint8_t *receivedResponse = (((uint8_t *)BigBuf) + RECV_RESP_OFFSET);
- uint8_t *receivedResponsePar = ((uint8_t *)BigBuf) + RECV_RESP_PAR_OFFSET;
-
+ uint8_t receivedResponse[MAX_MIFARE_FRAME_SIZE];
+ uint8_t receivedResponsePar[MAX_MIFARE_PARITY_SIZE];
+
// As we receive stuff, we copy it from receivedCmd or receivedResponse
// into trace, along with its length and other annotations.
//uint8_t *trace = (uint8_t *)BigBuf;
- // The DMA buffer, used to stream samples from the FPGA
- uint8_t *dmaBuf = ((uint8_t *)BigBuf) + DMA_BUFFER_OFFSET;
+ // free eventually allocated BigBuf memory
+ BigBuf_free();
+ // allocate the DMA buffer, used to stream samples from the FPGA
+ uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
uint8_t *data = dmaBuf;
uint8_t previous_data = 0;
int maxDataLen = 0;
// test for length of buffer
if(dataLen > maxDataLen) { // we are more behind than ever...
maxDataLen = dataLen;
- if(dataLen > 400) {
+ if(dataLen > (9 * DMA_BUFFER_SIZE / 10)) {
Dbprintf("blew circular buffer! dataLen=0x%x", dataLen);
break;
}
if (MfSniffLogic(receivedCmd, Uart.len, Uart.parity, Uart.bitCount, TRUE)) break;
/* And ready to receive another command. */
- UartReset();
+ UartInit(receivedCmd, receivedCmdPar);
/* And also reset the demod code */
DemodReset();
// And ready to receive another response.
DemodReset();
+
+ // And reset the Miller decoder including its (now outdated) input buffer
+ UartInit(receivedCmd, receivedCmdPar);
}
TagIsActive = (Demod.state != DEMOD_UNSYNCD);
}
projects / proxmark3-svn / blobdiff