]> git.zerfleddert.de Git - proxmark3-svn/blobdiff - client/mifarehost.c
fixing the crash on exit
[proxmark3-svn] / client / mifarehost.c
index 7f784850841095713a0a54284259bf9e1b552d05..c6c6877ed48cbd33c8071224e4b38be3c94f4030 100644 (file)
 // mifare commands\r
 //-----------------------------------------------------------------------------\r
 \r
 // mifare commands\r
 //-----------------------------------------------------------------------------\r
 \r
+#include "mifarehost.h"\r
+\r
 #include <stdio.h>\r
 #include <stdlib.h> \r
 #include <string.h>\r
 #include <pthread.h>\r
 #include <stdio.h>\r
 #include <stdlib.h> \r
 #include <string.h>\r
 #include <pthread.h>\r
-#include "mifarehost.h"\r
-#include "proxmark3.h"\r
 \r
 \r
-// MIFARE\r
-int compar_int(const void * a, const void * b) {\r
+#include "crapto1/crapto1.h"\r
+#include "proxmark3.h"\r
+#include "usb_cmd.h"\r
+#include "cmdmain.h"\r
+#include "ui.h"\r
+#include "util.h"\r
+#include "iso14443crc.h"\r
+\r
+// mifare tracer flags used in mfTraceDecode()\r
+#define TRACE_IDLE                                             0x00\r
+#define TRACE_AUTH1                                            0x01\r
+#define TRACE_AUTH2                                            0x02\r
+#define TRACE_AUTH_OK                                  0x03\r
+#define TRACE_READ_DATA                                0x04\r
+#define TRACE_WRITE_OK                                 0x05\r
+#define TRACE_WRITE_DATA                               0x06\r
+#define TRACE_ERROR                                            0xFF\r
+\r
+\r
+static int compare_uint64(const void *a, const void *b) {\r
        // didn't work: (the result is truncated to 32 bits)\r
        // didn't work: (the result is truncated to 32 bits)\r
-       //return (*(uint64_t*)b - *(uint64_t*)a);\r
+       //return (*(int64_t*)b - *(int64_t*)a);\r
 \r
        // better:\r
        if (*(uint64_t*)b == *(uint64_t*)a) return 0;\r
 \r
        // better:\r
        if (*(uint64_t*)b == *(uint64_t*)a) return 0;\r
-       else if (*(uint64_t*)b > *(uint64_t*)a) return 1;\r
+       else if (*(uint64_t*)b < *(uint64_t*)a) return 1;\r
        else return -1;\r
 }\r
 \r
        else return -1;\r
 }\r
 \r
+\r
+// create the intersection (common members) of two sorted lists. Lists are terminated by -1. Result will be in list1. Number of elements is returned.\r
+static uint32_t intersection(uint64_t *list1, uint64_t *list2)\r
+{\r
+       if (list1 == NULL || list2 == NULL) {\r
+               return 0;\r
+       }\r
+       uint64_t *p1, *p2, *p3;\r
+       p1 = p3 = list1; \r
+       p2 = list2;\r
+\r
+       while ( *p1 != -1 && *p2 != -1 ) {\r
+               if (compare_uint64(p1, p2) == 0) {\r
+                       *p3++ = *p1++;\r
+                       p2++;\r
+               }\r
+               else {\r
+                       while (compare_uint64(p1, p2) < 0) ++p1;\r
+                       while (compare_uint64(p1, p2) > 0) ++p2;\r
+               }\r
+       }\r
+       *p3 = -1;\r
+       return p3 - list1;\r
+}\r
+\r
+\r
+// Darkside attack (hf mf mifare)\r
+static uint32_t nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_t ks_info, uint64_t **keys) {\r
+       struct Crypto1State *states;\r
+       uint32_t i, pos, rr; //nr_diff;\r
+       uint8_t bt, ks3x[8], par[8][8];\r
+       uint64_t key_recovered;\r
+       static uint64_t *keylist;\r
+       rr = 0;\r
+\r
+       // Reset the last three significant bits of the reader nonce\r
+       nr &= 0xffffff1f;\r
+\r
+       for (pos=0; pos<8; pos++) {\r
+               ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;\r
+               bt = (par_info >> (pos*8)) & 0xff;\r
+               for (i=0; i<8; i++)     {\r
+                               par[7-pos][i] = (bt >> i) & 0x01;\r
+               }\r
+       }\r
+\r
+       states = lfsr_common_prefix(nr, rr, ks3x, par, (par_info == 0));\r
+\r
+       if (states == NULL) {\r
+               *keys = NULL;\r
+               return 0;\r
+       }\r
+\r
+       keylist = (uint64_t*)states;\r
+       \r
+       for (i = 0; keylist[i]; i++) {\r
+               lfsr_rollback_word(states+i, uid^nt, 0);\r
+               crypto1_get_lfsr(states+i, &key_recovered);\r
+               keylist[i] = key_recovered;\r
+       }\r
+       keylist[i] = -1;\r
+\r
+       *keys = keylist;\r
+       return i;\r
+}\r
+\r
+\r
+int mfDarkside(uint64_t *key)\r
+{\r
+       uint32_t uid = 0;\r
+       uint32_t nt = 0, nr = 0;\r
+       uint64_t par_list = 0, ks_list = 0;\r
+       uint64_t *keylist = NULL, *last_keylist = NULL;\r
+       uint32_t keycount = 0;\r
+       int16_t isOK = 0;\r
+\r
+       UsbCommand c = {CMD_READER_MIFARE, {true, 0, 0}};\r
+\r
+       // message\r
+       printf("-------------------------------------------------------------------------\n");\r
+       printf("Executing command. Expected execution time: 25sec on average\n");\r
+       printf("Press button on the proxmark3 device to abort both proxmark3 and client.\n");\r
+       printf("-------------------------------------------------------------------------\n");\r
+\r
+       \r
+       while (true) {\r
+               clearCommandBuffer();\r
+               SendCommand(&c);\r
+               \r
+               //flush queue\r
+               while (ukbhit()) {\r
+                       int c = getchar(); (void) c;\r
+               }\r
+               \r
+               // wait cycle\r
+               while (true) {\r
+                       printf(".");\r
+                       fflush(stdout);\r
+                       if (ukbhit()) {\r
+                               return -5;\r
+                               break;\r
+                       }\r
+                       \r
+                       UsbCommand resp;\r
+                       if (WaitForResponseTimeout(CMD_ACK, &resp, 1000)) {\r
+                               isOK  = resp.arg[0];\r
+                               if (isOK < 0) {\r
+                                       return isOK;\r
+                               }\r
+                               uid = (uint32_t)bytes_to_num(resp.d.asBytes +  0, 4);\r
+                               nt =  (uint32_t)bytes_to_num(resp.d.asBytes +  4, 4);\r
+                               par_list = bytes_to_num(resp.d.asBytes +  8, 8);\r
+                               ks_list = bytes_to_num(resp.d.asBytes +  16, 8);\r
+                               nr = bytes_to_num(resp.d.asBytes + 24, 4);\r
+                               break;\r
+                       }\r
+               }       \r
+\r
+               if (par_list == 0 && c.arg[0] == true) {\r
+                       PrintAndLog("Parity is all zero. Most likely this card sends NACK on every failed authentication.");\r
+                       PrintAndLog("Attack will take a few seconds longer because we need two consecutive successful runs.");\r
+               }\r
+               c.arg[0] = false;\r
+\r
+               keycount = nonce2key(uid, nt, nr, par_list, ks_list, &keylist);\r
+\r
+               if (keycount == 0) {\r
+                       PrintAndLog("Key not found (lfsr_common_prefix list is null). Nt=%08x", nt);    \r
+                       PrintAndLog("This is expected to happen in 25%% of all cases. Trying again with a different reader nonce...");\r
+                       continue;\r
+               }\r
+\r
+               qsort(keylist, keycount, sizeof(*keylist), compare_uint64);\r
+               keycount = intersection(last_keylist, keylist);\r
+               if (keycount == 0) {\r
+                       free(last_keylist);\r
+                       last_keylist = keylist;\r
+                       continue;\r
+               }\r
+\r
+               if (keycount > 1) {\r
+                       PrintAndLog("Found %u possible keys. Trying to authenticate with each of them ...\n", keycount);\r
+               } else {\r
+                       PrintAndLog("Found a possible key. Trying to authenticate...\n");\r
+               }               \r
+\r
+               *key = -1;\r
+               uint8_t keyBlock[USB_CMD_DATA_SIZE];\r
+               int max_keys = USB_CMD_DATA_SIZE/6;\r
+               for (int i = 0; i < keycount; i += max_keys) {\r
+                       int size = keycount - i > max_keys ? max_keys : keycount - i;\r
+                       for (int j = 0; j < size; j++) {\r
+                               if (last_keylist == NULL) {\r
+                                       num_to_bytes(keylist[i*max_keys + j], 6, keyBlock);\r
+                               } else {\r
+                                       num_to_bytes(last_keylist[i*max_keys + j], 6, keyBlock);\r
+                               }\r
+                       }\r
+                       if (!mfCheckKeys(0, 0, false, size, keyBlock, key)) {\r
+                               break;\r
+                       }\r
+               }       \r
+               \r
+               if (*key != -1) {\r
+                       free(last_keylist);\r
+                       free(keylist);\r
+                       break;\r
+               } else {\r
+                       PrintAndLog("Authentication failed. Trying again...");\r
+                       free(last_keylist);\r
+                       last_keylist = keylist;\r
+               }\r
+       }\r
+       \r
+       return 0;\r
+}\r
+\r
+\r
+int mfCheckKeys (uint8_t blockNo, uint8_t keyType, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){\r
+\r
+       *key = 0;\r
+\r
+       UsbCommand c = {CMD_MIFARE_CHKKEYS, {((blockNo & 0xff) | ((keyType&0xff)<<8)), clear_trace, keycnt}};\r
+       memcpy(c.d.asBytes, keyBlock, 6 * keycnt);\r
+       SendCommand(&c);\r
+\r
+       UsbCommand resp;\r
+       if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1;\r
+       if ((resp.arg[0] & 0xff) != 0x01) return 2;\r
+       *key = bytes_to_num(resp.d.asBytes, 6);\r
+       return 0;\r
+}\r
+\r
 // Compare 16 Bits out of cryptostate\r
 int Compare16Bits(const void * a, const void * b) {\r
        if ((*(uint64_t*)b & 0x00ff000000ff0000) == (*(uint64_t*)a & 0x00ff000000ff0000)) return 0;\r
 // Compare 16 Bits out of cryptostate\r
 int Compare16Bits(const void * a, const void * b) {\r
        if ((*(uint64_t*)b & 0x00ff000000ff0000) == (*(uint64_t*)a & 0x00ff000000ff0000)) return 0;\r
@@ -67,9 +278,9 @@ void* nested_worker_thread(void *arg)
        return statelist->head.slhead;\r
 }\r
 \r
        return statelist->head.slhead;\r
 }\r
 \r
-int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t * resultKey, bool calibrate) \r
+int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t *key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t *resultKey, bool calibrate) \r
 {\r
 {\r
-       uint16_t i, len;\r
+       uint16_t i;\r
        uint32_t uid;\r
        UsbCommand resp;\r
 \r
        uint32_t uid;\r
        UsbCommand resp;\r
 \r
@@ -77,31 +288,29 @@ int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo
        struct Crypto1State *p1, *p2, *p3, *p4;\r
        \r
        // flush queue\r
        struct Crypto1State *p1, *p2, *p3, *p4;\r
        \r
        // flush queue\r
-       WaitForResponseTimeout(CMD_ACK,NULL,100);\r
+       WaitForResponseTimeout(CMD_ACK, NULL, 100);\r
        \r
        UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};\r
        memcpy(c.d.asBytes, key, 6);\r
        SendCommand(&c);\r
 \r
        \r
        UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};\r
        memcpy(c.d.asBytes, key, 6);\r
        SendCommand(&c);\r
 \r
-       if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {\r
-               len = resp.arg[1];\r
-               if (len == 2) { \r
-                       memcpy(&uid, resp.d.asBytes, 4);\r
-                       PrintAndLog("uid:%08x len=%d trgbl=%d trgkey=%x", uid, len, (uint16_t)resp.arg[2] & 0xff, (uint16_t)resp.arg[2] >> 8);\r
-                       \r
-                       for (i = 0; i < 2; i++) {\r
-                               statelists[i].blockNo = resp.arg[2] & 0xff;\r
-                               statelists[i].keyType = (resp.arg[2] >> 8) & 0xff;\r
-                               statelists[i].uid = uid;\r
+       if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {\r
+               return -1;\r
+       }\r
 \r
 \r
-                               memcpy(&statelists[i].nt,  (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4);\r
-                               memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4);\r
-                       }\r
-               }\r
-               else {\r
-                       PrintAndLog("Got 0 keys from proxmark."); \r
-                       return 1;\r
-               }\r
+       if (resp.arg[0]) {\r
+               return resp.arg[0];  // error during nested\r
+       }\r
+               \r
+       memcpy(&uid, resp.d.asBytes, 4);\r
+       PrintAndLog("uid:%08x trgbl=%d trgkey=%x", uid, (uint16_t)resp.arg[2] & 0xff, (uint16_t)resp.arg[2] >> 8);\r
+       \r
+       for (i = 0; i < 2; i++) {\r
+               statelists[i].blockNo = resp.arg[2] & 0xff;\r
+               statelists[i].keyType = (resp.arg[2] >> 8) & 0xff;\r
+               statelists[i].uid = uid;\r
+               memcpy(&statelists[i].nt,  (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4);\r
+               memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4);\r
        }\r
        \r
        // calc keys\r
        }\r
        \r
        // calc keys\r
@@ -147,8 +356,8 @@ int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo
                        while (Compare16Bits(p1, p2) == 1) p2++;\r
                }\r
        }\r
                        while (Compare16Bits(p1, p2) == 1) p2++;\r
                }\r
        }\r
-       p3->even = 0; p3->odd = 0;\r
-       p4->even = 0; p4->odd = 0;\r
+       *(uint64_t*)p3 = -1;\r
+       *(uint64_t*)p4 = -1;\r
        statelists[0].len = p3 - statelists[0].head.slhead;\r
        statelists[1].len = p4 - statelists[1].head.slhead;\r
        statelists[0].tail.sltail=--p3;\r
        statelists[0].len = p3 - statelists[0].head.slhead;\r
        statelists[1].len = p4 - statelists[1].head.slhead;\r
        statelists[0].tail.sltail=--p3;\r
@@ -156,24 +365,9 @@ int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo
 \r
        // the statelists now contain possible keys. The key we are searching for must be in the\r
        // intersection of both lists. Create the intersection:\r
 \r
        // the statelists now contain possible keys. The key we are searching for must be in the\r
        // intersection of both lists. Create the intersection:\r
-       qsort(statelists[0].head.keyhead, statelists[0].len, sizeof(uint64_t), compar_int);\r
-       qsort(statelists[1].head.keyhead, statelists[1].len, sizeof(uint64_t), compar_int);\r
-\r
-       uint64_t *p5, *p6, *p7;\r
-       p5 = p7 = statelists[0].head.keyhead; \r
-       p6 = statelists[1].head.keyhead;\r
-       while (p5 <= statelists[0].tail.keytail && p6 <= statelists[1].tail.keytail) {\r
-               if (compar_int(p5, p6) == 0) {\r
-                       *p7++ = *p5++;\r
-                       p6++;\r
-               }\r
-               else {\r
-                       while (compar_int(p5, p6) == -1) p5++;\r
-                       while (compar_int(p5, p6) == 1) p6++;\r
-               }\r
-       }\r
-       statelists[0].len = p7 - statelists[0].head.keyhead;\r
-       statelists[0].tail.keytail=--p7;\r
+       qsort(statelists[0].head.keyhead, statelists[0].len, sizeof(uint64_t), compare_uint64);\r
+       qsort(statelists[1].head.keyhead, statelists[1].len, sizeof(uint64_t), compare_uint64);\r
+       statelists[0].len = intersection(statelists[0].head.keyhead, statelists[1].head.keyhead);\r
 \r
        memset(resultKey, 0, 6);\r
        // The list may still contain several key candidates. Test each of them with mfCheckKeys\r
 \r
        memset(resultKey, 0, 6);\r
        // The list may still contain several key candidates. Test each of them with mfCheckKeys\r
@@ -183,7 +377,7 @@ int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo
                crypto1_get_lfsr(statelists[0].head.slhead + i, &key64);\r
                num_to_bytes(key64, 6, keyBlock);\r
                key64 = 0;\r
                crypto1_get_lfsr(statelists[0].head.slhead + i, &key64);\r
                num_to_bytes(key64, 6, keyBlock);\r
                key64 = 0;\r
-               if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, 1, keyBlock, &key64)) {\r
+               if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, false, 1, keyBlock, &key64)) {\r
                        num_to_bytes(key64, 6, resultKey);\r
                        break;\r
                }\r
                        num_to_bytes(key64, 6, resultKey);\r
                        break;\r
                }\r
@@ -195,21 +389,6 @@ int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo
        return 0;\r
 }\r
 \r
        return 0;\r
 }\r
 \r
-int mfCheckKeys (uint8_t blockNo, uint8_t keyType, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){\r
-\r
-       *key = 0;\r
-\r
-       UsbCommand c = {CMD_MIFARE_CHKKEYS, {blockNo, keyType, keycnt}};\r
-       memcpy(c.d.asBytes, keyBlock, 6 * keycnt);\r
-       SendCommand(&c);\r
-\r
-       UsbCommand resp;\r
-       if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1;\r
-       if ((resp.arg[0] & 0xff) != 0x01) return 2;\r
-       *key = bytes_to_num(resp.d.asBytes, 6);\r
-       return 0;\r
-}\r
-\r
 // EMULATOR\r
 \r
 int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {\r
 // EMULATOR\r
 \r
 int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {\r
@@ -231,29 +410,22 @@ int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {
 \r
 // "MAGIC" CARD\r
 \r
 \r
 // "MAGIC" CARD\r
 \r
-int mfCSetUID(uint8_t *uid, uint8_t *oldUID, bool wantWipe) {\r
-       \r
-       uint8_t oldblock0[16] = {0x00};\r
-       uint8_t block0[16] = {0x00};\r
-       memcpy(block0, uid, 4); \r
-       block0[4] = block0[0]^block0[1]^block0[2]^block0[3]; // Mifare UID BCC\r
-       // mifare classic SAK(byte 5) and ATQA(byte 6 and 7)\r
-       //block0[5] = 0x08;\r
-       //block0[6] = 0x04;\r
-       //block0[7] = 0x00;\r
-       \r
-       block0[5] = 0x01;  //sak\r
-       block0[6] = 0x01;\r
-       block0[7] = 0x0f;\r
-       \r
-       int old = mfCGetBlock(0, oldblock0, CSETBLOCK_SINGLE_OPER);\r
-       if ( old == 0) {\r
-               memcpy(block0+8, oldblock0+8, 8);\r
-               PrintAndLog("block 0:  %s", sprint_hex(block0,16));\r
+int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {\r
+       uint8_t isOK = 0;\r
+\r
+       UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, 0, blockNo}};\r
+       SendCommand(&c);\r
+\r
+  UsbCommand resp;\r
+       if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {\r
+               isOK  = resp.arg[0] & 0xff;\r
+               memcpy(data, resp.d.asBytes, 16);\r
+               if (!isOK) return 2;\r
        } else {\r
        } else {\r
-               PrintAndLog("Couldn't get olddata. Will write over the last bytes of Block 0.");\r
+               PrintAndLog("Command execute timeout");\r
+               return 1;\r
        }\r
        }\r
-       return mfCSetBlock(0, block0, oldUID, wantWipe, CSETBLOCK_SINGLE_OPER);\r
+       return 0;\r
 }\r
 \r
 int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uint8_t params) {\r
 }\r
 \r
 int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uint8_t params) {\r
@@ -277,22 +449,32 @@ int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uin
        return 0;\r
 }\r
 \r
        return 0;\r
 }\r
 \r
-int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {\r
-       uint8_t isOK = 0;\r
-\r
-       UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, 0, blockNo}};\r
-       SendCommand(&c);\r
+int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, bool wantWipe) {\r
+       uint8_t oldblock0[16] = {0x00};\r
+       uint8_t block0[16] = {0x00};\r
 \r
 \r
-  UsbCommand resp;\r
-       if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {\r
-               isOK  = resp.arg[0] & 0xff;\r
-               memcpy(data, resp.d.asBytes, 16);\r
-               if (!isOK) return 2;\r
+       int old = mfCGetBlock(0, oldblock0, CSETBLOCK_SINGLE_OPER);\r
+       if (old == 0) {\r
+               memcpy(block0, oldblock0, 16);\r
+               PrintAndLog("old block 0:  %s", sprint_hex(block0,16));\r
        } else {\r
        } else {\r
-               PrintAndLog("Command execute timeout");\r
-               return 1;\r
+               PrintAndLog("Couldn't get old data. Will write over the last bytes of Block 0.");\r
        }\r
        }\r
-       return 0;\r
+\r
+       // fill in the new values\r
+       // UID\r
+       memcpy(block0, uid, 4); \r
+       // Mifare UID BCC\r
+       block0[4] = block0[0]^block0[1]^block0[2]^block0[3];\r
+       // mifare classic SAK(byte 5) and ATQA(byte 6 and 7, reversed)\r
+       if (sak!=NULL)\r
+               block0[5]=sak[0];\r
+       if (atqa!=NULL) {\r
+               block0[6]=atqa[1];\r
+               block0[7]=atqa[0];\r
+       }\r
+       PrintAndLog("new block 0:  %s", sprint_hex(block0,16));\r
+       return mfCSetBlock(0, block0, oldUID, wantWipe, CSETBLOCK_SINGLE_OPER);\r
 }\r
 \r
 // SNIFFER\r
 }\r
 \r
 // SNIFFER\r
@@ -336,6 +518,23 @@ int isBlockTrailer(int blockN) {
  return ((blockN & 0x03) == 0x03);\r
 }\r
 \r
  return ((blockN & 0x03) == 0x03);\r
 }\r
 \r
+int saveTraceCard(void) {\r
+       FILE * f;\r
+       \r
+       if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;\r
+       \r
+       f = fopen(traceFileName, "w+");\r
+       if ( !f ) return 1;\r
+       \r
+       for (int i = 0; i < 64; i++) {  // blocks\r
+               for (int j = 0; j < 16; j++)  // bytes\r
+                       fprintf(f, "%02x", *(traceCard + i * 16 + j)); \r
+               fprintf(f,"\n");\r
+       }\r
+       fclose(f);\r
+       return 0;\r
+}\r
+\r
 int loadTraceCard(uint8_t *tuid) {\r
        FILE * f;\r
        char buf[64] = {0x00};\r
 int loadTraceCard(uint8_t *tuid) {\r
        FILE * f;\r
        char buf[64] = {0x00};\r
@@ -351,10 +550,7 @@ int loadTraceCard(uint8_t *tuid) {
        FillFileNameByUID(traceFileName, tuid, ".eml", 7);\r
 \r
        f = fopen(traceFileName, "r");\r
        FillFileNameByUID(traceFileName, tuid, ".eml", 7);\r
 \r
        f = fopen(traceFileName, "r");\r
-       if (!f) {\r
-               fclose(f);\r
-               return 1;\r
-       }\r
+       if (!f) return 1;\r
        \r
        blockNum = 0;\r
                \r
        \r
        blockNum = 0;\r
                \r
@@ -385,26 +581,6 @@ int loadTraceCard(uint8_t *tuid) {
        return 0;\r
 }\r
 \r
        return 0;\r
 }\r
 \r
-int saveTraceCard(void) {\r
-       FILE * f;\r
-       \r
-       if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;\r
-       \r
-       f = fopen(traceFileName, "w+");\r
-       if ( !f ) {\r
-               fclose(f);\r
-               return 1;\r
-       }\r
-       \r
-       for (int i = 0; i < 64; i++) {  // blocks\r
-               for (int j = 0; j < 16; j++)  // bytes\r
-                       fprintf(f, "%02x", *(traceCard + i * 16 + j)); \r
-               fprintf(f,"\n");\r
-       }\r
-       fclose(f);\r
-       return 0;\r
-}\r
-\r
 int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {\r
 \r
        if (traceCrypto1) \r
 int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {\r
 \r
        if (traceCrypto1) \r
@@ -624,3 +800,23 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {
 \r
        return 0;\r
 }\r
 \r
        return 0;\r
 }\r
+\r
+int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, int len){\r
+       /*\r
+       uint32_t nt;      // tag challenge\r
+       uint32_t ar_enc;  // encrypted reader response\r
+       uint32_t at_enc;  // encrypted tag response\r
+       */\r
+       if (traceCrypto1) {\r
+               crypto1_destroy(traceCrypto1);\r
+       }\r
+       ks2 = ar_enc ^ prng_successor(nt, 64);\r
+       ks3 = at_enc ^ prng_successor(nt, 96);\r
+       traceCrypto1 = lfsr_recovery64(ks2, ks3);\r
+\r
+       mf_crypto1_decrypt(traceCrypto1, data, len, 0);\r
+\r
+       PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) );\r
+       crypto1_destroy(traceCrypto1);\r
+       return 0;\r
+}\r
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