git.zerfleddert.de Git - proxmark3-svn/blobdiff

-// Merlok, 2011\r

+// Merlok, 2011, 2012\r

// people from mifare@nethemba.com, 2010\r

//\r

// This code is licensed to you under the terms of the GNU GPL, version 2 or,\r

// at your option, any later version. See the LICENSE.txt file for the text of\r

// the license.\r

//-----------------------------------------------------------------------------\r

// people from mifare@nethemba.com, 2010\r

//\r

// This code is licensed to you under the terms of the GNU GPL, version 2 or,\r

// at your option, any later version. See the LICENSE.txt file for the text of\r

// the license.\r

//-----------------------------------------------------------------------------\r

-// High frequency ISO14443A commands\r

+// mifare commands\r

//-----------------------------------------------------------------------------\r

\r

//-----------------------------------------------------------------------------\r

\r

+#include "mifarehost.h"\r

+\r

#include <stdio.h>\r

-#include <stdlib.h> \r

+#include <stdlib.h>\r

#include <string.h>\r

-#include "mifarehost.h"\r

+#include <pthread.h>\r

+\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

+#include "mifare.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

+static int compare_uint64(const void *a, const void *b) {\r

+ // didn't work: (the result is truncated to 32 bits)\r

+ //return (*(int64_t*)b - *(int64_t*)a);\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 return -1;\r

+}\r

\r

-int compar_int(const void * a, const void * b) {\r

- return (*(uint64_t*)b - *(uint64_t*)a);\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

+ *p3 = -1;\r

+ return p3 - list1;\r

}\r

\r

}\r

\r

-// Compare countKeys structure\r

-int compar_special_int(const void * a, const void * b) {\r

- return (((countKeys *)b)->count - ((countKeys *)a)->count);\r

-}\r

\r

-countKeys * uniqsort(uint64_t * possibleKeys, uint32_t size) {\r

- int i, j = 0;\r

- int count = 0;\r

- countKeys *our_counts;\r

- \r

- qsort(possibleKeys, size, sizeof (uint64_t), compar_int);\r

- \r

- our_counts = calloc(size, sizeof(countKeys));\r

- if (our_counts == NULL) {\r

- PrintAndLog("Memory allocation error for our_counts");\r

- return NULL;\r

- }\r

- \r

- for (i = 0; i < size; i++) {\r

- if (possibleKeys[i+1] == possibleKeys[i]) { \r

- count++;\r

- } else {\r

- our_counts[j].key = possibleKeys[i];\r

- our_counts[j].count = count;\r

- j++;\r

- count=0;\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

- qsort(our_counts, j, sizeof(countKeys), compar_special_int);\r

- return (our_counts);\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

\r

-int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t * resultKeys) \r

+\r

+int mfDarkside(uint64_t *key)\r

{\r

- int i, m, len;\r

- uint8_t isEOF;\r

- uint32_t uid;\r

- fnVector * vector = NULL;\r

- countKeys *ck;\r

- int lenVector = 0;\r

- UsbCommand * resp = NULL;\r

- \r

- memset(resultKeys, 0x00, 16 * 6);\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

- // flush queue\r

- while (WaitForResponseTimeout(CMD_ACK, 500) != NULL) ;\r

- \r

- UsbCommand c = {CMD_MIFARE_NESTED, {blockNo, keyType, trgBlockNo + trgKeyType * 0x100}};\r

- memcpy(c.d.asBytes, key, 6);\r

- SendCommand(&c);\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

- PrintAndLog("\n");\r

\r

- // wait cycle\r

while (true) {\r

- printf(".");\r

- if (ukbhit()) {\r

- getchar();\r

- printf("\naborted via keyboard!\n");\r

- break;\r

+ clearCommandBuffer();\r

+ SendCommand(&c);\r

+\r

+ //flush queue\r

+ while (ukbhit()) {\r

+ int c = getchar(); (void) c;\r

}\r

\r

}\r

\r

- resp = WaitForResponseTimeout(CMD_ACK, 1500);\r

-\r

- if (resp != NULL) {\r

- isEOF = resp->arg[0] & 0xff;\r

-\r

- if (isEOF) break;\r

- \r

- len = resp->arg[1] & 0xff;\r

- if (len == 0) continue;\r

- \r

- memcpy(&uid, resp->d.asBytes, 4); \r

- PrintAndLog("uid:%08x len=%d trgbl=%d trgkey=%x", uid, len, resp->arg[2] & 0xff, (resp->arg[2] >> 8) & 0xff);\r

- vector = (fnVector *) realloc((void *)vector, (lenVector + len) * sizeof(fnVector) + 200);\r

- if (vector == NULL) {\r

- PrintAndLog("Memory allocation error for fnVector. len: %d bytes: %d", lenVector + len, (lenVector + len) * sizeof(fnVector)); \r

+ // wait cycle\r

+ while (true) {\r

+ printf(".");\r

+ fflush(stdout);\r

+ if (ukbhit()) {\r

+ return -5;\r

break;\r

}\r

break;\r

}\r

- \r

- for (i = 0; i < len; i++) {\r

- vector[lenVector + i].blockNo = resp->arg[2] & 0xff;\r

- vector[lenVector + i].keyType = (resp->arg[2] >> 8) & 0xff;\r

- vector[lenVector + i].uid = uid;\r

-\r

- memcpy(&vector[lenVector + i].nt, (void *)(resp->d.asBytes + 8 + i * 8 + 0), 4);\r

- memcpy(&vector[lenVector + i].ks1, (void *)(resp->d.asBytes + 8 + i * 8 + 4), 4);\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

- lenVector += len;\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

- }\r

- \r

- if (!lenVector) {\r

- PrintAndLog("Got 0 keys from proxmark."); \r

- return 1;\r

- }\r

- printf("------------------------------------------------------------------\n");\r

- \r

- // calc keys\r

- struct Crypto1State* revstate = NULL;\r

- struct Crypto1State* revstate_start = NULL;\r

- uint64_t lfsr;\r

- int kcount = 0;\r

- pKeys *pk;\r

- \r

- if ((pk = (void *) malloc(sizeof(pKeys))) == NULL) return 1;\r

- memset(pk, 0x00, sizeof(pKeys));\r

- \r

- for (m = 0; m < lenVector; m++) {\r

- // And finally recover the first 32 bits of the key\r

- revstate = lfsr_recovery32(vector[m].ks1, vector[m].nt ^ vector[m].uid);\r

- if (revstate_start == NULL) revstate_start = revstate;\r

- \r

- while ((revstate->odd != 0x0) || (revstate->even != 0x0)) {\r

- lfsr_rollback_word(revstate, vector[m].nt ^ vector[m].uid, 0);\r

- crypto1_get_lfsr(revstate, &lfsr);\r

+ c.arg[0] = false;\r

+\r

+ keycount = nonce2key(uid, nt, nr, par_list, ks_list, &keylist);\r

\r

- // Allocate a new space for keys\r

- if (((kcount % MEM_CHUNK) == 0) || (kcount >= pk->size)) {\r

- pk->size += MEM_CHUNK;\r

-//fprintf(stdout, "New chunk by %d, sizeof %d\n", kcount, pk->size * sizeof(uint64_t));\r

- pk->possibleKeys = (uint64_t *) realloc((void *)pk->possibleKeys, pk->size * sizeof(uint64_t));\r

- if (pk->possibleKeys == NULL) {\r

- PrintAndLog("Memory allocation error for pk->possibleKeys"); \r

- return 1;\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

- pk->possibleKeys[kcount] = lfsr;\r

- kcount++;\r

- revstate++;\r

+ if (!mfCheckKeys(0, 0, false, size, keyBlock, key)) {\r

+ break;\r

+ }\r

}\r

- free(revstate_start);\r

- revstate_start = NULL;\r

\r

- }\r

- \r

- // Truncate\r

- if (kcount != 0) {\r

- pk->size = --kcount;\r

- if ((pk->possibleKeys = (uint64_t *) realloc((void *)pk->possibleKeys, pk->size * sizeof(uint64_t))) == NULL) {\r

- PrintAndLog("Memory allocation error for pk->possibleKeys"); \r

- return 1;\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

}\r

\r

- PrintAndLog("Total keys count:%d", kcount);\r

- ck = uniqsort(pk->possibleKeys, pk->size);\r

+ return 0;\r

+}\r

\r

- // fill key array\r

- for (i = 0; i < 16 ; i++) {\r

- num_to_bytes(ck[i].key, 6, (uint8_t*)(resultKeys + i * 6));\r

- }\r

\r

- // finalize\r

- free(pk->possibleKeys);\r

- free(pk);\r

- free(ck);\r

- free(vector);\r

+int mfCheckKeys (uint8_t blockNo, uint8_t keyType, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){\r

\r

+ *key = -1;\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

return 0;\r

}\r

\r

-int mfCheckKeys (uint8_t blockNo, uint8_t keyType, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){\r

- *key = 0;\r

+int mfCheckKeysSec(uint8_t sectorCnt, uint8_t keyType, uint8_t timeout14a, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, sector_t * e_sector){\r

+\r

+ uint8_t keyPtr = 0;\r

\r

- UsbCommand c = {CMD_MIFARE_CHKKEYS, {blockNo, keyType, keycnt}};\r

+ if (e_sector == NULL)\r

+ return -1;\r

+\r

+ UsbCommand c = {CMD_MIFARE_CHKKEYS, {((sectorCnt & 0xff) | ((keyType & 0xff) << 8)), (clear_trace | 0x02)|((timeout14a & 0xff) << 8), keycnt}}; \r

memcpy(c.d.asBytes, keyBlock, 6 * keycnt);\r

+ SendCommand(&c);\r

+\r

+ UsbCommand resp;\r

+ if (!WaitForResponseTimeoutW(CMD_ACK, &resp, MAX(3000, 1000 + 13 * sectorCnt * keycnt * (keyType == 2 ? 2 : 1)), false)) return 1; // timeout: 13 ms / fail auth\r

+ if ((resp.arg[0] & 0xff) != 0x01) return 2;\r

+ \r

+ bool foundAKey = false;\r

+ for(int sec = 0; sec < sectorCnt; sec++){\r

+ for(int keyAB = 0; keyAB < 2; keyAB++){\r

+ keyPtr = *(resp.d.asBytes + keyAB * 40 + sec);\r

+ if (keyPtr){\r

+ e_sector[sec].foundKey[keyAB] = true;\r

+ e_sector[sec].Key[keyAB] = bytes_to_num(keyBlock + (keyPtr - 1) * 6, 6);\r

+ foundAKey = true;\r

+ }\r

+ return foundAKey ? 0 : 3;\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

+ else if ((*(uint64_t*)b & 0x00ff000000ff0000) > (*(uint64_t*)a & 0x00ff000000ff0000)) return 1;\r

+ else return -1;\r

+}\r

+\r

+typedef\r

+ struct {\r

+ union {\r

+ struct Crypto1State *slhead;\r

+ uint64_t *keyhead;\r

+ } head;\r

+ union {\r

+ struct Crypto1State *sltail;\r

+ uint64_t *keytail;\r

+ } tail;\r

+ uint32_t len;\r

+ uint32_t uid;\r

+ uint32_t blockNo;\r

+ uint32_t keyType;\r

+ uint32_t nt;\r

+ uint32_t ks1;\r

+ } StateList_t;\r

+\r

+// wrapper function for multi-threaded lfsr_recovery32\r

+void* nested_worker_thread(void *arg)\r

+{\r

+ struct Crypto1State *p1;\r

+ StateList_t *statelist = arg;\r

+\r

+ statelist->head.slhead = lfsr_recovery32(statelist->ks1, statelist->nt ^ statelist->uid);\r

+ for (p1 = statelist->head.slhead; *(uint64_t *)p1 != 0; p1++);\r

+ statelist->len = p1 - statelist->head.slhead;\r

+ statelist->tail.sltail = --p1;\r

+ qsort(statelist->head.slhead, statelist->len, sizeof(uint64_t), Compare16Bits);\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

+{\r

+ uint16_t i;\r

+ uint32_t uid;\r

+ UsbCommand resp;\r

+\r

+ StateList_t statelists[2];\r

+ struct Crypto1State *p1, *p2, *p3, *p4;\r

+\r

+ // flush queue\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

+ if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {\r

+ return -1;\r

+ }\r

+\r

+ if (resp.arg[0]) {\r

+ return resp.arg[0]; // error during nested\r

+ }\r

\r

- SendCommand(&c);\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

- UsbCommand * resp = WaitForResponseTimeout(CMD_ACK, 3000);\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

+ pthread_t thread_id[2];\r

+\r

+ // create and run worker threads\r

+ for (i = 0; i < 2; i++) {\r

+ pthread_create(thread_id + i, NULL, nested_worker_thread, &statelists[i]);\r

+ }\r

+\r

+ // wait for threads to terminate:\r

+ for (i = 0; i < 2; i++) {\r

+ pthread_join(thread_id[i], (void*)&statelists[i].head.slhead);\r

+ }\r

+\r

+ // the first 16 Bits of the cryptostate already contain part of our key.\r

+ // Create the intersection of the two lists based on these 16 Bits and\r

+ // roll back the cryptostate\r

+ p1 = p3 = statelists[0].head.slhead;\r

+ p2 = p4 = statelists[1].head.slhead;\r

+ while (p1 <= statelists[0].tail.sltail && p2 <= statelists[1].tail.sltail) {\r

+ if (Compare16Bits(p1, p2) == 0) {\r

+ struct Crypto1State savestate, *savep = &savestate;\r

+ savestate = *p1;\r

+ while(Compare16Bits(p1, savep) == 0 && p1 <= statelists[0].tail.sltail) {\r

+ *p3 = *p1;\r

+ lfsr_rollback_word(p3, statelists[0].nt ^ statelists[0].uid, 0);\r

+ p3++;\r

+ p1++;\r

+ }\r

+ savestate = *p2;\r

+ while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].tail.sltail) {\r

+ *p4 = *p2;\r

+ lfsr_rollback_word(p4, statelists[1].nt ^ statelists[1].uid, 0);\r

+ p4++;\r

+ p2++;\r

+ }\r

+ else {\r

+ while (Compare16Bits(p1, p2) == -1) p1++;\r

+ while (Compare16Bits(p1, p2) == 1) p2++;\r

+ }\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[1].tail.sltail=--p4;\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), 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

+ for (i = 0; i < statelists[0].len; i++) {\r

+ uint8_t keyBlock[6];\r

+ uint64_t key64;\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, false, 1, keyBlock, &key64)) {\r

+ num_to_bytes(key64, 6, resultKey);\r

+ break;\r

+ }\r

+\r

+ free(statelists[0].head.slhead);\r

+ free(statelists[1].head.slhead);\r

\r

- if (resp == NULL) 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

return 0;\r

}\r

\r

+// EMULATOR\r

+\r

int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {\r

UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};\r

int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {\r

UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};\r

- \r

- SendCommand(&c);\r

-\r

- UsbCommand * resp = WaitForResponseTimeout(CMD_ACK, 1500);\r

+ SendCommand(&c);\r

\r

- if (resp == NULL) return 1;\r

- memcpy(data, resp->d.asBytes, blocksCount * 16); \r

+ UsbCommand resp;\r

+ if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1;\r

+ memcpy(data, resp.d.asBytes, blocksCount * 16);\r

return 0;\r

}\r

\r

int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {\r

UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, 0}};\r

return 0;\r

}\r

\r

int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {\r

UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, 0}};\r

- memcpy(c.d.asBytes, data, blocksCount * 16); \r

+ memcpy(c.d.asBytes, data, blocksCount * 16);\r

SendCommand(&c);\r

return 0;\r

}\r

\r

SendCommand(&c);\r

return 0;\r

}\r

\r

-int mfCSetUID(uint8_t *uid, uint8_t *oldUID, int wantWipe) {\r

- uint8_t block0[16];\r

- memset(block0, 0, 16);\r

- memcpy(block0, uid, 4); \r

- block0[4] = block0[0]^block0[1]^block0[2]^block0[3]; // Mifare UID BCC\r

- \r

- return mfCSetBlock(0, block0, oldUID, wantWipe, CSETBLOCK_SINGLE_OPER);\r

-}\r

+// "MAGIC" CARD\r

\r

-int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, int wantWipe, uint8_t params) {\r

+int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {\r

uint8_t isOK = 0;\r

\r

uint8_t isOK = 0;\r

\r

- UsbCommand c = {CMD_MIFARE_EML_CSETBLOCK, {wantWipe, params & (0xFE | (uid == NULL ? 0:1)), blockNo}};\r

- memcpy(c.d.asBytes, data, 16); \r

+ UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, 0, blockNo}};\r

SendCommand(&c);\r

\r

SendCommand(&c);\r

\r

- UsbCommand * resp = WaitForResponseTimeout(CMD_ACK, 1500);\r

-\r

- if (resp != NULL) {\r

- isOK = resp->arg[0] & 0xff;\r

- if (uid != NULL) memcpy(uid, resp->d.asBytes, 4); \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

PrintAndLog("Command execute timeout");\r

if (!isOK) return 2;\r

} else {\r

PrintAndLog("Command execute timeout");\r

return 0;\r

}\r

\r

return 0;\r

}\r

\r

-int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {\r

+int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uint8_t params) {\r

+\r

uint8_t isOK = 0;\r

+ UsbCommand c = {CMD_MIFARE_CSETBLOCK, {wantWipe, params & (0xFE | (uid == NULL ? 0:1)), blockNo}};\r

+ memcpy(c.d.asBytes, data, 16);\r

+ SendCommand(&c);\r

\r

- UsbCommand c = {CMD_MIFARE_EML_CGETBLOCK, {params, 0, blockNo}};\r

+ UsbCommand resp;\r

+ if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {\r

+ isOK = resp.arg[0] & 0xff;\r

+ if (uid != NULL)\r

+ memcpy(uid, resp.d.asBytes, 4);\r

+ if (!isOK)\r

+ return 2;\r

+ } else {\r

+ PrintAndLog("Command execute timeout");\r

+ return 1;\r

+ }\r

+\r

+ return 0;\r

+}\r

+\r

+int mfCWipe(uint32_t numSectors, bool gen1b, bool wantWipe, bool wantFill) {\r

+ uint8_t isOK = 0;\r

+ uint8_t cmdParams = wantWipe + wantFill * 0x02 + gen1b * 0x04;\r

+ UsbCommand c = {CMD_MIFARE_CWIPE, {numSectors, cmdParams, 0}};\r

SendCommand(&c);\r

\r

SendCommand(&c);\r

\r

- UsbCommand * resp = WaitForResponseTimeout(CMD_ACK, 1500);\r

+ UsbCommand resp;\r

+ WaitForResponse(CMD_ACK,&resp);\r

+ isOK = resp.arg[0] & 0xff;\r

+ \r

+ return isOK;\r

+}\r

\r

- if (resp != NULL) {\r

- isOK = resp->arg[0] & 0xff;\r

- memcpy(data, resp->d.asBytes, 16); \r

- if (!isOK) return 2;\r

+int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID) {\r

+ uint8_t oldblock0[16] = {0x00};\r

+ uint8_t block0[16] = {0x00};\r

+ int gen = 0, res;\r

+\r

+ gen = mfCIdentify();\r

+\r

+ /* generation 1a magic card by default */\r

+ uint8_t cmdParams = CSETBLOCK_SINGLE_OPER;\r

+ if (gen == 2) {\r

+ /* generation 1b magic card */\r

+ cmdParams = CSETBLOCK_SINGLE_OPER | CSETBLOCK_MAGIC_1B;\r

+ }\r

+ \r

+ res = mfCGetBlock(0, oldblock0, cmdParams);\r

+\r

+ if (res == 0) {\r

+ memcpy(block0, oldblock0, 16);\r

+ PrintAndLog("old block 0: %s", sprint_hex(block0,16));\r

} else {\r

- PrintAndLog("Command execute timeout");\r

+ PrintAndLog("Couldn't get old data. Will write over the last bytes of Block 0.");\r

+ }\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

+\r

+ res = mfCSetBlock(0, block0, oldUID, false, cmdParams);\r

+ if (res) {\r

+ PrintAndLog("Can't set block 0. Error: %d", res);\r

+ return res;\r

+ }\r

+ \r

+ return 0;\r

+}\r

+\r

+int mfCIdentify() {\r

+ UsbCommand c = {CMD_MIFARE_CIDENT, {0, 0, 0}};\r

+ SendCommand(&c);\r

+ UsbCommand resp;\r

+ WaitForResponse(CMD_ACK,&resp);\r

+\r

+ uint8_t isGeneration = resp.arg[0] & 0xff;\r

+ switch( isGeneration ){\r

+ case 1: PrintAndLog("Chinese magic backdoor commands (GEN 1a) detected"); break;\r

+ case 2: PrintAndLog("Chinese magic backdoor command (GEN 1b) detected"); break;\r

+ default: PrintAndLog("No chinese magic backdoor command detected"); break;\r

+ }\r

+\r

+ return (int) isGeneration;\r

+}\r

+\r

+// SNIFFER\r

+\r

+// constants\r

+static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};\r

+\r

+// variables\r

+char logHexFileName[FILE_PATH_SIZE] = {0x00};\r

+static uint8_t traceCard[4096] = {0x00};\r

+static char traceFileName[FILE_PATH_SIZE] = {0x00};\r

+static int traceState = TRACE_IDLE;\r

+static uint8_t traceCurBlock = 0;\r

+static uint8_t traceCurKey = 0;\r

+\r

+struct Crypto1State *traceCrypto1 = NULL;\r

+\r

+struct Crypto1State *revstate;\r

+uint64_t lfsr;\r

+uint32_t ks2;\r

+uint32_t ks3;\r

+\r

+uint32_t uid; // serial number\r

+uint32_t nt; // tag challenge\r

+uint32_t nr_enc; // encrypted reader challenge\r

+uint32_t ar_enc; // encrypted reader response\r

+uint32_t at_enc; // encrypted tag response\r

+\r

+int isTraceCardEmpty(void) {\r

+ return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));\r

+}\r

+\r

+int isBlockEmpty(int blockN) {\r

+ for (int i = 0; i < 16; i++)\r

+ if (traceCard[blockN * 16 + i] != 0) return 0;\r

+\r

+ return 1;\r

+}\r

+\r

+int isBlockTrailer(int blockN) {\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

+ uint8_t buf8[64] = {0x00};\r

+ int i, blockNum;\r

+\r

+ if (!isTraceCardEmpty())\r

+ saveTraceCard();\r

+\r

+ memset(traceCard, 0x00, 4096);\r

+ memcpy(traceCard, tuid + 3, 4);\r

+\r

+ FillFileNameByUID(traceFileName, tuid, ".eml", 7);\r

+\r

+ f = fopen(traceFileName, "r");\r

+ if (!f) return 1;\r

+\r

+ blockNum = 0;\r

+\r

+ while(!feof(f)){\r

+\r

+ memset(buf, 0, sizeof(buf));\r

+ if (fgets(buf, sizeof(buf), f) == NULL) {\r

+ PrintAndLog("File reading error.");\r

+ fclose(f);\r

+ return 2;\r

+ }\r

+\r

+ if (strlen(buf) < 32){\r

+ if (feof(f)) break;\r

+ PrintAndLog("File content error. Block data must include 32 HEX symbols");\r

+ fclose(f);\r

+ return 2;\r

+ }\r

+ for (i = 0; i < 32; i += 2)\r

+ sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);\r

+\r

+ memcpy(traceCard + blockNum * 16, buf8, 16);\r

+\r

+ blockNum++;\r

+ }\r

+ fclose(f);\r

+\r

+ return 0;\r

+}\r

+\r

+int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {\r

+\r

+ if (traceCrypto1)\r

+ crypto1_destroy(traceCrypto1);\r

+\r

+ traceCrypto1 = NULL;\r

+\r

+ if (wantSaveToEmlFile)\r

+ loadTraceCard(tuid);\r

+\r

+ traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];\r

+ traceCard[5] = sak;\r

+ memcpy(&traceCard[6], atqa, 2);\r

+ traceCurBlock = 0;\r

+ uid = bytes_to_num(tuid + 3, 4);\r

+\r

+ traceState = TRACE_IDLE;\r

+\r

+ return 0;\r

+}\r

+\r

+void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){\r

+ uint8_t bt = 0;\r

+ int i;\r

+\r

+ if (len != 1) {\r

+ for (i = 0; i < len; i++)\r

+ data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];\r

+ } else {\r

+ bt = 0;\r

+ for (i = 0; i < 4; i++)\r

+ bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i;\r

+\r

+ data[0] = bt;\r

+ }\r

+ return;\r

+}\r

+\r

+int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {\r

+ uint8_t data[64];\r

+\r

+ if (traceState == TRACE_ERROR) return 1;\r

+ if (len > 64) {\r

+ traceState = TRACE_ERROR;\r

return 1;\r

}\r

return 1;\r

}\r

+\r

+ memcpy(data, data_src, len);\r

+ if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {\r

+ mf_crypto1_decrypt(traceCrypto1, data, len, 0);\r

+ PrintAndLog("dec> %s", sprint_hex(data, len));\r

+ AddLogHex(logHexFileName, "dec> ", data, len);\r

+ }\r

+\r

+ switch (traceState) {\r

+ case TRACE_IDLE:\r

+ // check packet crc16!\r

+ if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {\r

+ PrintAndLog("dec> CRC ERROR!!!");\r

+ AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!");\r

+ traceState = TRACE_ERROR; // do not decrypt the next commands\r

+ return 1;\r

+ }\r

+\r

+ // AUTHENTICATION\r

+ if ((len ==4) && ((data[0] == 0x60) || (data[0] == 0x61))) {\r

+ traceState = TRACE_AUTH1;\r

+ traceCurBlock = data[1];\r

+ traceCurKey = data[0] == 60 ? 1:0;\r

+ return 0;\r

+ }\r

+\r

+ // READ\r

+ if ((len ==4) && ((data[0] == 0x30))) {\r

+ traceState = TRACE_READ_DATA;\r

+ traceCurBlock = data[1];\r

+ return 0;\r

+ }\r

+\r

+ // WRITE\r

+ if ((len ==4) && ((data[0] == 0xA0))) {\r

+ traceState = TRACE_WRITE_OK;\r

+ traceCurBlock = data[1];\r

+ return 0;\r

+ }\r

+\r

+ // HALT\r

+ if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {\r

+ traceState = TRACE_ERROR; // do not decrypt the next commands\r

+ return 0;\r

+ }\r

+\r

+ return 0;\r

+ break;\r

+\r

+ case TRACE_READ_DATA:\r

+ if (len == 18) {\r

+ traceState = TRACE_IDLE;\r

+\r

+ if (isBlockTrailer(traceCurBlock)) {\r

+ memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);\r

+ } else {\r

+ memcpy(traceCard + traceCurBlock * 16, data, 16);\r

+ }\r

+ if (wantSaveToEmlFile) saveTraceCard();\r

+ return 0;\r

+ } else {\r

+ traceState = TRACE_ERROR;\r

+ return 1;\r

+ }\r

+ break;\r

+\r

+ case TRACE_WRITE_OK:\r

+ if ((len == 1) && (data[0] == 0x0a)) {\r

+ traceState = TRACE_WRITE_DATA;\r

+\r

+ return 0;\r

+ } else {\r

+ traceState = TRACE_ERROR;\r

+ return 1;\r

+ }\r

+ break;\r

+\r

+ case TRACE_WRITE_DATA:\r

+ if (len == 18) {\r

+ traceState = TRACE_IDLE;\r

+\r

+ memcpy(traceCard + traceCurBlock * 16, data, 16);\r

+ if (wantSaveToEmlFile) saveTraceCard();\r

+ return 0;\r

+ } else {\r

+ traceState = TRACE_ERROR;\r

+ return 1;\r

+ }\r

+ break;\r

+\r

+ case TRACE_AUTH1:\r

+ if (len == 4) {\r

+ traceState = TRACE_AUTH2;\r

+ nt = bytes_to_num(data, 4);\r

+ return 0;\r

+ } else {\r

+ traceState = TRACE_ERROR;\r

+ return 1;\r

+ }\r

+ break;\r

+\r

+ case TRACE_AUTH2:\r

+ if (len == 8) {\r

+ traceState = TRACE_AUTH_OK;\r

+\r

+ nr_enc = bytes_to_num(data, 4);\r

+ ar_enc = bytes_to_num(data + 4, 4);\r

+ return 0;\r

+ } else {\r

+ traceState = TRACE_ERROR;\r

+ return 1;\r

+ }\r

+ break;\r

+\r

+ case TRACE_AUTH_OK:\r

+ if (len ==4) {\r

+ traceState = TRACE_IDLE;\r

+\r

+ at_enc = bytes_to_num(data, 4);\r

+\r

+ // decode key here)\r

+ ks2 = ar_enc ^ prng_successor(nt, 64);\r

+ ks3 = at_enc ^ prng_successor(nt, 96);\r

+ revstate = lfsr_recovery64(ks2, ks3);\r

+ lfsr_rollback_word(revstate, 0, 0);\r

+ lfsr_rollback_word(revstate, nr_enc, 1);\r

+ lfsr_rollback_word(revstate, uid ^ nt, 0);\r

+\r

+ crypto1_get_lfsr(revstate, &lfsr);\r

+ printf("key> %x%x\n", (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF));\r

+ AddLogUint64(logHexFileName, "key> ", lfsr);\r

+\r

+ int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;\r

+ if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);\r

+\r

+ if (traceCurKey) {\r

+ num_to_bytes(lfsr, 6, traceCard + blockShift + 10);\r

+ } else {\r

+ num_to_bytes(lfsr, 6, traceCard + blockShift);\r

+ }\r

+ if (wantSaveToEmlFile) saveTraceCard();\r

+\r

+ if (traceCrypto1) {\r

+ crypto1_destroy(traceCrypto1);\r

+ }\r

+\r

+ // set cryptosystem state\r

+ traceCrypto1 = lfsr_recovery64(ks2, ks3);\r

+\r

+// nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;\r

+\r

+ /* traceCrypto1 = crypto1_create(lfsr); // key in lfsr\r

+ crypto1_word(traceCrypto1, nt ^ uid, 0);\r

+ crypto1_word(traceCrypto1, ar, 1);\r

+ crypto1_word(traceCrypto1, 0, 0);\r

+ crypto1_word(traceCrypto1, 0, 0);*/\r

+\r

+ return 0;\r

+ } else {\r

+ traceState = TRACE_ERROR;\r

+ return 1;\r

+ }\r

+ break;\r

+\r

+ default:\r

+ traceState = TRACE_ERROR;\r

+ return 1;\r

+ }\r

+\r

+ return 0;\r

+}\r

+\r

+// DECODING\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

return 0;\r

}\r

+\r

+/** validate_prng_nonce\r

+ * Determine if nonce is deterministic. ie: Suspectable to Darkside attack.\r

+ * returns\r

+ * true = weak prng\r

+ * false = hardend prng\r

+ */\r

+bool validate_prng_nonce(uint32_t nonce) {\r

+ uint16_t *dist = 0;\r

+ uint16_t x, i;\r

+\r

+ dist = malloc(2 << 16);\r

+ if(!dist)\r

+ return -1;\r

+\r

+ // init prng table:\r

+ for (x = i = 1; i; ++i) {\r

+ dist[(x & 0xff) << 8 | x >> 8] = i;\r

+ x = x >> 1 | (x ^ x >> 2 ^ x >> 3 ^ x >> 5) << 15;\r

+ }\r

+ \r

+ uint32_t res = (65535 - dist[nonce >> 16] + dist[nonce & 0xffff]) % 65535;\r

+ \r

+ free(dist); \r

+ return (res == 16);\r

+}\r

+\r

+/* Detect Tag Prng, \r

+* function performs a partial AUTH, where it tries to authenticate against block0, key A, but only collects tag nonce.\r

+* the tag nonce is check to see if it has a predictable PRNG.\r

+* @returns \r

+* TRUE if tag uses WEAK prng (ie Now the NACK bug also needs to be present for Darkside attack)\r

+* FALSE is tag uses HARDEND prng (ie hardnested attack possible, with known key)\r

+*/\r

+int DetectClassicPrng(void){\r

+\r

+ UsbCommand resp, respA; \r

+ uint8_t cmd[] = {0x60, 0x00}; // MIFARE_AUTH_KEYA\r

+ uint32_t flags = ISO14A_CONNECT | ISO14A_RAW | ISO14A_APPEND_CRC | ISO14A_NO_RATS;\r

+ \r

+ UsbCommand c = {CMD_READER_ISO_14443a, {flags, sizeof(cmd), 0}};\r

+ memcpy(c.d.asBytes, cmd, sizeof(cmd));\r

+\r

+ clearCommandBuffer();\r

+ SendCommand(&c);\r

+ if (!WaitForResponseTimeout(CMD_ACK, &resp, 2000)) {\r

+ PrintAndLog("PRNG UID: Reply timeout.");\r

+ return -1;\r

+ }\r

+ \r

+ // if select tag failed.\r

+ if (resp.arg[0] == 0) {\r

+ PrintAndLog("PRNG error: selecting tag failed, can't detect prng.");\r

+ return -1;\r

+ }\r

+ \r

+ if (!WaitForResponseTimeout(CMD_ACK, &respA, 5000)) {\r

+ PrintAndLog("PRNG data: Reply timeout.");\r

+ return -1;\r

+ }\r

+\r

+ // check respA\r

+ if (respA.arg[0] != 4) {\r

+ PrintAndLog("PRNG data error: Wrong length: %d", respA.arg[0]);\r

+ return -1;\r

+ }\r

+\r

+ uint32_t nonce = bytes_to_num(respA.d.asBytes, respA.arg[0]);\r

+ return validate_prng_nonce(nonce);\r

+}\r