FIX: since the correctionNeeded logic changed, with PR #87 (https://github.com...

[proxmark3-svn] / armsrc / iso14443a.c

diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c
index 76a766737e6e59671673df1a365c618d0fd13e73..f86b816fe049a0efc81a1334fe322aabba758e96 100644 (file)
--- a/armsrc/iso14443a.c
+++ b/armsrc/iso14443a.c
@@ -1080,15 +1080,15 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
                                uint8_t emdata[MAX_MIFARE_FRAME_SIZE];
                                emlGetMemBt( emdata, start, 16);
                                AppendCrc14443a(emdata, 16);
-                               EmSendCmdEx(emdata, sizeof(emdata), false);
+                               EmSendCmdEx(emdata, sizeof(emdata));
                                // We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below
                                p_response = NULL;
                        } else { // all other tags (16 byte block tags)
                                uint8_t emdata[MAX_MIFARE_FRAME_SIZE];
                                emlGetMemBt( emdata, block, 16);
                                AppendCrc14443a(emdata, 16);
-                               EmSendCmdEx(emdata, sizeof(emdata), false);
-                               // EmSendCmdEx(data+(4*receivedCmd[1]),16,false);
+                               EmSendCmdEx(emdata, sizeof(emdata));
+                               // EmSendCmdEx(data+(4*receivedCmd[1]),16);
                                // Dbprintf("Read request from reader: %x %x",receivedCmd[0],receivedCmd[1]);
                                // We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below
                                p_response = NULL;
@@ -1100,7 +1100,7 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
                        int len   = (receivedCmd[2] - receivedCmd[1] + 1) * 4;
                        emlGetMemBt( emdata, start, len);
                        AppendCrc14443a(emdata, len);
-                       EmSendCmdEx(emdata, len+2, false);                              
+                       EmSendCmdEx(emdata, len+2);                             
                        p_response = NULL;              
                } else if(receivedCmd[0] == MIFARE_ULEV1_READSIG && tagType == 7) {     // Received a READ SIGNATURE -- 
                        // first 12 blocks of emu are [getversion answer - check tearing - pack - 0x00 - signature]
@@ -1108,7 +1108,7 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
                        uint8_t emdata[34];
                        emlGetMemBt( emdata, start, 32);
                        AppendCrc14443a(emdata, 32);
-                       EmSendCmdEx(emdata, sizeof(emdata), false);
+                       EmSendCmdEx(emdata, sizeof(emdata));
                        p_response = NULL;                                      
                } else if (receivedCmd[0] == MIFARE_ULEV1_READ_CNT && tagType == 7) {   // Received a READ COUNTER -- 
                        uint8_t index = receivedCmd[1];
@@ -1117,7 +1117,7 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
                                num_to_bytes(counters[index], 3, cmd);
                                AppendCrc14443a(cmd, sizeof(cmd)-2);
                        }
-                       EmSendCmdEx(cmd,sizeof(cmd),false);                             
+                       EmSendCmdEx(cmd,sizeof(cmd));                           
                        p_response = NULL;
                } else if (receivedCmd[0] == MIFARE_ULEV1_INCR_CNT && tagType == 7) {   // Received a INC COUNTER -- 
                        // number of counter
@@ -1127,7 +1127,7 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
                
                        // send ACK
                        uint8_t ack[] = {0x0a};
-                       EmSendCmdEx(ack,sizeof(ack),false);
+                       EmSendCmdEx(ack,sizeof(ack));
                        p_response = NULL;                      
                } else if(receivedCmd[0] == MIFARE_ULEV1_CHECKTEAR && tagType == 7) {   // Received a CHECK_TEARING_EVENT -- 
                        // first 12 blocks of emu are [getversion answer - check tearing - pack - 0x00 - signature]
@@ -1136,7 +1136,7 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
                        if (receivedCmd[1]<3) counter = receivedCmd[1];
                        emlGetMemBt( emdata, 10+counter, 1);
                        AppendCrc14443a(emdata, sizeof(emdata)-2);
-                       EmSendCmdEx(emdata, sizeof(emdata), false);     
+                       EmSendCmdEx(emdata, sizeof(emdata));    
                        p_response = NULL;              
                } else if(receivedCmd[0] == ISO14443A_CMD_HALT) {       // Received a HALT
                        LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE);
@@ -1146,7 +1146,7 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
                                uint8_t emdata[10];
                                emlGetMemBt( emdata, 0, 8 );
                                AppendCrc14443a(emdata, sizeof(emdata)-2);
-                               EmSendCmdEx(emdata, sizeof(emdata), false);
+                               EmSendCmdEx(emdata, sizeof(emdata));
                                p_response = NULL;
                        } else {
                                                                
@@ -1242,7 +1242,7 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
                                uint8_t emdata[4];
                                emlGetMemBt( emdata, start, 2);
                                AppendCrc14443a(emdata, 2);
-                               EmSendCmdEx(emdata, sizeof(emdata), false);
+                               EmSendCmdEx(emdata, sizeof(emdata));
                                p_response = NULL;
                                uint32_t pwd = bytes_to_num(receivedCmd+1,4);
                                
@@ -1338,7 +1338,7 @@ void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
                cmdsRecvd++;
 
                if (p_response != NULL) {
-                       EmSendCmd14443aRaw(p_response->modulation, p_response->modulation_n, receivedCmd[0] == 0x52);
+                       EmSendCmd14443aRaw(p_response->modulation, p_response->modulation_n);
                        // do the tracing for the previous reader request and this tag answer:
                        uint8_t par[MAX_PARITY_SIZE] = {0x00};
                        GetParity(p_response->response, p_response->response_n, par);
@@ -1596,17 +1596,25 @@ int EmGetCmd(uint8_t *received, uint16_t *len, uint8_t *parity) {
        }
 }
 
-int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen, bool correctionNeeded) {
+int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen) {
        uint8_t b;
        uint16_t i = 0;
        uint32_t ThisTransferTime;
+       bool correctionNeeded;
        
        // Modulate Manchester
        FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD);
 
-       // include correction bit if necessary
-       if (Uart.parityBits & 0x01) {
-               correctionNeeded = TRUE;
+       // Include correction bit if necessary
+       if (Uart.bitCount == 7)
+       {
+               // Short tags (7 bits) don't have parity, determine the correct value from MSB
+               correctionNeeded = Uart.output[0] & 0x40;
+       }
+       else
+       {
+               // The parity bits are left-aligned
+               correctionNeeded = Uart.parity[(Uart.len-1)/8] & (0x80 >> ((Uart.len-1) & 7));
        }
        // 1236, so correction bit needed
        i = (correctionNeeded) ? 0 : 1;
@@ -1647,13 +1655,13 @@ int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen, bool correctionNeeded) {
                        i++;
                }
        }
-       LastTimeProxToAirStart = ThisTransferTime + (correctionNeeded?8:0);
+       LastTimeProxToAirStart = ThisTransferTime + (correctionNeeded ? 8 : 0);
        return 0;
 }
 
-int EmSend4bitEx(uint8_t resp, bool correctionNeeded){
+int EmSend4bit(uint8_t resp){
        Code4bitAnswerAsTag(resp);
-       int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded);
+       int res = EmSendCmd14443aRaw(ToSend, ToSendMax);
        // do the tracing for the previous reader request and this tag answer:
        uint8_t par[1] = {0x00};
        GetParity(&resp, 1, par);
@@ -1670,13 +1678,9 @@ int EmSend4bitEx(uint8_t resp, bool correctionNeeded){
        return res;
 }
 
-int EmSend4bit(uint8_t resp){
-       return EmSend4bitEx(resp, false);
-}
-
-int EmSendCmdExPar(uint8_t *resp, uint16_t respLen, bool correctionNeeded, uint8_t *par){
+int EmSendCmdExPar(uint8_t *resp, uint16_t respLen, uint8_t *par){
        CodeIso14443aAsTagPar(resp, respLen, par);
-       int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded);
+       int res = EmSendCmd14443aRaw(ToSend, ToSendMax);
        // do the tracing for the previous reader request and this tag answer:
        EmLogTrace(Uart.output, 
                                Uart.len, 
@@ -1691,20 +1695,20 @@ int EmSendCmdExPar(uint8_t *resp, uint16_t respLen, bool correctionNeeded, uint8
        return res;
 }
 
-int EmSendCmdEx(uint8_t *resp, uint16_t respLen, bool correctionNeeded){
+int EmSendCmdEx(uint8_t *resp, uint16_t respLen){
        uint8_t par[MAX_PARITY_SIZE] = {0x00};
        GetParity(resp, respLen, par);
-       return EmSendCmdExPar(resp, respLen, correctionNeeded, par);
+       return EmSendCmdExPar(resp, respLen, par);
 }
 
 int EmSendCmd(uint8_t *resp, uint16_t respLen){
        uint8_t par[MAX_PARITY_SIZE] = {0x00};
        GetParity(resp, respLen, par);
-       return EmSendCmdExPar(resp, respLen, false, par);
+       return EmSendCmdExPar(resp, respLen, par);
 }
 
 int EmSendCmdPar(uint8_t *resp, uint16_t respLen, uint8_t *par){
-       return EmSendCmdExPar(resp, respLen, false, par);
+       return EmSendCmdExPar(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,
@@ -2592,7 +2596,7 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
                // this if-statement doesn't match the specification above. (iceman)
                if (len == 1 && ((receivedCmd[0] == ISO14443A_CMD_REQA && cardSTATE != MFEMUL_HALTED) || receivedCmd[0] == ISO14443A_CMD_WUPA)) {
                        selTimer = GetTickCount();
-                       EmSendCmdEx(atqa, sizeof(atqa), (receivedCmd[0] == ISO14443A_CMD_WUPA));
+                       EmSendCmdEx(atqa, sizeof(atqa));
                        cardSTATE = MFEMUL_SELECT1;
                        crypto1_destroy(pcs);
                        cardAUTHKEY = 0xff;