FIX: "hf 14a sim" fixes to CRC calc.

ADD: added CHECK_TEARING command support in "hf 14a sim" (EV1/NTAG216 command)
BUGS:  the read range probably will could currupt memory..ref:: http://www.proxmark.org/forum/viewtopic.php?pid=16611#p16611

diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c
index e1ec477c454ebb1f9f92f5aeb301edf454940d0b..8aa99d675ce56311a5cdf314133c6250b12f0282 100644 (file)
--- a/armsrc/iso14443a.c
+++ b/armsrc/iso14443a.c
@@ -913,8 +913,9 @@ bool prepare_tag_modulation(tag_response_info_t* response_info, size_t max_buffe
 // 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
-// 44 * 8 data bits, 44 * 1 parity bits, 9 start bits, 9 stop bits, 9 correction bits
-#define ALLOCATED_TAG_MODULATION_BUFFER_SIZE 370  //273
+// 44 * 8 data bits, 44 * 1 parity bits, 9 start bits, 9 stop bits, 9 correction bits --370
+// 47 * 8 data bits, 47 * 1 parity bits, 10 start bits, 10 stop bits, 10 correction bits 
+#define ALLOCATED_TAG_MODULATION_BUFFER_SIZE 453 
 
 bool prepare_allocated_tag_modulation(tag_response_info_t* response_info) {
   // Retrieve and store the current buffer index
@@ -1064,7 +1065,10 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
        //uint8_t response7_EV1[] = {0x00, 0x04, 0x03, 0x01, 0x01, 0x00, 0x0b, 0x03, 0xfd, 0xf7};  //EV1 48bytes VERSION.
        uint8_t response7_NTAG[] = {0x00, 0x04, 0x04, 0x02, 0x01, 0x00, 0x11, 0x03, 0x01, 0x9e}; //NTAG 215
        
-       #define TAG_RESPONSE_COUNT 9
+       // Prepare CHK_TEARING
+       uint8_t response9[] =  {0xBD,0x90,0x3f};
+       
+       #define TAG_RESPONSE_COUNT 10
        tag_response_info_t responses[TAG_RESPONSE_COUNT] = {
                { .response = response1,  .response_n = sizeof(response1)  },  // Answer to request - respond with card type
                { .response = response2,  .response_n = sizeof(response2)  },  // Anticollision cascade1 - respond with uid
@@ -1075,6 +1079,7 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
                { .response = response6,  .response_n = sizeof(response6)  },  // dummy ATS (pseudo-ATR), answer to RATS
                { .response = response7_NTAG,  .response_n = sizeof(response7_NTAG)  },  // EV1/NTAG GET_VERSION response
                { .response = response8,   .response_n = sizeof(response8) },  // EV1/NTAG PACK response
+               { .response = response9,   .response_n = sizeof(response9) }  // EV1/NTAG CHK_TEAR response
        };
 
        // Allocate 512 bytes for the dynamic modulation, created when the reader queries for it
@@ -1167,10 +1172,11 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
                                        0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
                                        0x00,0x00,0x00,0x00,
                                        0x00,0x00};
-                                       ComputeCrc14443(CRC_14443_A, blockdata+start, 16, blockdata+start+17, blockdata+start+18);
+                                       AppendCrc14443a(blockdata+start, 16);
+                                       
                                        EmSendCmdEx( blockdata+start, 18, false);
                                } else {                                
-                                       ComputeCrc14443(CRC_14443_A, blockzeros,16, blockzeros+17,blockzeros+18);
+                                       AppendCrc14443a(blockzeros, 16);
                                        EmSendCmdEx(blockzeros,18,false);
                                }
                                p_response = NULL;
@@ -1181,9 +1187,9 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
                                // We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below
                                p_response = NULL;
                        }
-               } else if(receivedCmd[0] == 0x3A) {     // Received a FAST READ   -- just returns all zeros.
-                               uint8_t len = (receivedCmd[2]- receivedCmd[1] ) * 4;
-                               ComputeCrc14443(CRC_14443_A, blockzeros,len, blockzeros+len+1, blockzeros+len+2);
+               } else if(receivedCmd[0] == 0x3A) {     // Received a FAST READ (ranged read) -- just returns all zeros.
+                               uint8_t len = (receivedCmd[2] - receivedCmd[1] ) * 4;                           
+                               AppendCrc14443a(blockzeros,len);
                                EmSendCmdEx(blockzeros,len+2,false);                            
                                p_response = NULL;                      
                } else if(receivedCmd[0] == 0x3C && tagType == 7) {     // Received a READ SIGNATURE -- 
@@ -1193,14 +1199,16 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
                                                                  0xcf,0xd3,0x61,0x36,0xca,0x5f,0xbb,0x05,
                                                                  0xce,0x21,0x24,0x5b,0xa6,0x7a,0x79,0x07,
                                                                  0x00,0x00};
-                               ComputeCrc14443(CRC_14443_A, data, sizeof(data), data+33, data+34);
+                               AppendCrc14443a(data, sizeof(data));
                                EmSendCmdEx(data,sizeof(data),false);                           
                                p_response = NULL;                                      
                } else if(receivedCmd[0] == 0x39 && tagType == 7) {     // Received a READ COUNTER -- 
-                               uint8_t data[] =  {0x00,0x00,0x00,0x00,0x00};
-                               ComputeCrc14443(CRC_14443_A, data, sizeof(data), data+4, data+5);
+                               uint8_t data[] =  {0x00,0x00,0x00,0x14,0xa5};
+                               //AppendCrc14443a(data, sizeof(data));
                                EmSendCmdEx(data,sizeof(data),false);                           
-                               p_response = NULL;                      
+                               p_response = NULL;
+               } else if(receivedCmd[0] == 0x3E && tagType == 7) {     // Received a CHECK_TEARING_EVENT -- 
+                               p_response = &responses[9];                             
                } else if(receivedCmd[0] == 0x50) {     // Received a HALT
 
                        if (tracing) {
@@ -1378,10 +1386,12 @@ void SimulateIso14443aTag(int tagType, int flags, int uid_2nd, byte_t* data)
        }
 
        FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-       
-       Dbprintf("%x %x %x", happened, happened2, cmdsRecvd);
-       LED_A_OFF();
        BigBuf_free_keep_EM();
+       LED_A_OFF();
+       
+       Dbprintf("-[ Wake ups after halt [%d]", happened);
+       Dbprintf("-[ Messages after halt [%d]", happened2);
+       Dbprintf("-[ Num of received cmd [%d]", cmdsRecvd);
 }