mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-11-04 20:50:37 -08:00
320 lines
8.9 KiB
C
320 lines
8.9 KiB
C
//
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// bruteforce the upper 16bits of a partial key recovered from mf_nonce_brute.
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// J-run's original idea was a two part recovery vector with first a offline trace and then online for 2 bytes.
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//
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// This idea is two use only offline, to recover a nested authentication key.
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// Assumption, we get a read/write command after a nested auth, we need 22 bytes of data.
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// Iceman, 2021,
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//
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#define __STDC_FORMAT_MACROS
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <string.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "ctype.h"
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#include "crapto1/crapto1.h"
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#include "protocol.h"
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#include "iso14443crc.h"
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#include <util_posix.h>
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#define AEND "\x1b[0m"
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#define _RED_(s) "\x1b[31m" s AEND
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#define _GREEN_(s) "\x1b[32m" s AEND
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#define _YELLOW_(s) "\x1b[33m" s AEND
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#define _CYAN_(s) "\x1b[36m" s AEND
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// a global mutex to prevent interlaced printing from different threads
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pthread_mutex_t print_lock;
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#define ENC_LEN (4 + 16 + 2)
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//--------------------- define options here
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typedef struct thread_args {
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int thread;
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int idx;
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uint32_t uid;
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uint32_t part_key;
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uint32_t nt_enc;
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uint32_t nr_enc;
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uint16_t enc_len;
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uint8_t enc[ENC_LEN]; // next encrypted command + a full read/write
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} targs;
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//------------------------------------------------------------------
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uint8_t cmds[8][2] = {
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{ISO14443A_CMD_READBLOCK, 18},
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{ISO14443A_CMD_WRITEBLOCK, 18},
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{MIFARE_AUTH_KEYA, 0},
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{MIFARE_AUTH_KEYB, 0},
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{MIFARE_CMD_INC, 6},
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{MIFARE_CMD_DEC, 6},
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{MIFARE_CMD_RESTORE, 6},
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{MIFARE_CMD_TRANSFER, 0}
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};
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static int global_found = 0;
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static int thread_count = 2;
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static int param_getptr(const char *line, int *bg, int *en, int paramnum) {
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int i;
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int len = strlen(line);
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*bg = 0;
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*en = 0;
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// skip spaces
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while (line[*bg] == ' ' || line[*bg] == '\t')(*bg)++;
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if (*bg >= len) {
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return 1;
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}
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for (i = 0; i < paramnum; i++) {
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while (line[*bg] != ' ' && line[*bg] != '\t' && line[*bg] != '\0')(*bg)++;
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while (line[*bg] == ' ' || line[*bg] == '\t')(*bg)++;
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if (line[*bg] == '\0') return 1;
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}
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*en = *bg;
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while (line[*en] != ' ' && line[*en] != '\t' && line[*en] != '\0')(*en)++;
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(*en)--;
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return 0;
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}
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static int param_gethex_to_eol(const char *line, int paramnum, uint8_t *data, int maxdatalen, int *datalen) {
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int bg, en;
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uint32_t temp;
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char buf[5] = {0};
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if (param_getptr(line, &bg, &en, paramnum)) return 1;
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*datalen = 0;
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int indx = bg;
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while (line[indx]) {
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if (line[indx] == '\t' || line[indx] == ' ') {
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indx++;
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continue;
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}
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if (isxdigit(line[indx])) {
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buf[strlen(buf) + 1] = 0x00;
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buf[strlen(buf)] = line[indx];
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} else {
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// if we have symbols other than spaces and hex
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return 1;
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}
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if (*datalen >= maxdatalen) {
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// if we don't have space in buffer and have symbols to translate
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return 2;
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}
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if (strlen(buf) >= 2) {
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sscanf(buf, "%x", &temp);
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data[*datalen] = (uint8_t)(temp & 0xff);
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*buf = 0;
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(*datalen)++;
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}
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indx++;
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}
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if (strlen(buf) > 0)
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//error when not completed hex bytes
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return 3;
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return 0;
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}
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static void hex_to_buffer(const uint8_t *buf, const uint8_t *hex_data, const size_t hex_len, const size_t hex_max_len,
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const size_t min_str_len, const size_t spaces_between, bool uppercase) {
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if (buf == NULL) return;
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char *tmp_base = (char *)buf;
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char *tmp = tmp_base;
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size_t i;
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size_t max_len = (hex_len > hex_max_len) ? hex_max_len : hex_len;
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for (i = 0; i < max_len; ++i, tmp += 2 + spaces_between) {
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snprintf(tmp, hex_max_len - (tmp - tmp_base), (uppercase) ? "%02X" : "%02x", (unsigned int) hex_data[i]);
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for (size_t j = 0; j < spaces_between; j++)
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snprintf(tmp + 2 + j, hex_max_len - (2 + j + (tmp - tmp_base)), " ");
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}
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i *= (2 + spaces_between);
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size_t mlen = min_str_len > i ? min_str_len : 0;
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if (mlen > hex_max_len)
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mlen = hex_max_len;
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for (; i < mlen; i++, tmp += 1)
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snprintf(tmp, hex_max_len - (tmp - tmp_base), " ");
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// remove last space
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*tmp = '\0';
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}
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static char *sprint_hex_inrow_ex(const uint8_t *data, const size_t len, const size_t min_str_len) {
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static char buf[100] = {0};
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hex_to_buffer((uint8_t *)buf, data, len, sizeof(buf) - 1, min_str_len, 0, true);
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return buf;
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}
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static bool checkValidCmdByte(uint8_t *cmd, uint16_t n) {
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bool ok = false;
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if (cmd == NULL)
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return false;
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for (int i = 0; i < 8; ++i) {
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if (cmd[0] == cmds[i][0]) {
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if (n >= 4)
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ok = CheckCrc14443(CRC_14443_A, cmd, 4);
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if (cmds[i][1] > 0 && n >= cmds[i][1])
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ok = CheckCrc14443(CRC_14443_A, cmd + 4, cmds[i][1]);
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if (ok) {
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return true;
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}
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}
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}
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return false;
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}
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static void *brute_thread(void *arguments) {
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struct thread_args *args = (struct thread_args *) arguments;
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uint64_t key = args->part_key;
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uint8_t local_enc[args->enc_len];
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memcpy(local_enc, args->enc, args->enc_len);
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for (uint64_t count = args->idx; count < 0xFFFF; count += thread_count) {
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if (__atomic_load_n(&global_found, __ATOMIC_ACQUIRE) == 1) {
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break;
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}
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key |= count << 32;
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// Init cipher with key
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struct Crypto1State *pcs = crypto1_create(key);
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// NESTED decrypt nt with help of new key
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crypto1_word(pcs, args->nt_enc ^ args->uid, 1);
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crypto1_word(pcs, args->nr_enc, 1);
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crypto1_word(pcs, 0, 0);
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crypto1_word(pcs, 0, 0);
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// decrypt 22 bytes
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uint8_t dec[args->enc_len];
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for (int i = 0; i < args->enc_len; i++)
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dec[i] = crypto1_byte(pcs, 0x00, 0) ^ local_enc[i];
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crypto1_destroy(pcs);
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if (checkValidCmdByte(dec, args->enc_len) == false) {
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continue;
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}
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__sync_fetch_and_add(&global_found, 1);
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// lock this section to avoid interlacing prints from different threats
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pthread_mutex_lock(&print_lock);
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printf("\nenc: %s\n", sprint_hex_inrow_ex(local_enc, args->enc_len, 0));
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printf("dec: %s\n", sprint_hex_inrow_ex(dec, args->enc_len, 0));
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printf("\nValid Key found [ " _GREEN_("%012" PRIx64) " ]\n\n", key);
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pthread_mutex_unlock(&print_lock);
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break;
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}
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free(args);
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return NULL;
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}
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static int usage(void) {
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printf(" syntax: mf_trace_brute <uid> <partial key> <{nt}> <{nr}> [<{next_command + 18 bytes}>]\n\n");
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return 1;
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}
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int main(int argc, const char *argv[]) {
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printf("Mifare classic nested auth key recovery Phase 2\n");
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if (argc < 3) return usage();
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uint32_t uid = 0; // serial number
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uint32_t part_key = 0; // last 4 keys of key
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uint32_t nt_enc = 0; // noncce tag
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uint32_t nr_enc = 0; // nonce reader encrypted
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sscanf(argv[1], "%x", &uid);
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sscanf(argv[2], "%x", &part_key);
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sscanf(argv[3], "%x", &nt_enc);
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sscanf(argv[4], "%x", &nr_enc);
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int enc_len = 0;
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uint8_t enc[ENC_LEN] = {0}; // next encrypted command + a full read/write
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param_gethex_to_eol(argv[5], 0, enc, sizeof(enc), &enc_len);
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printf("-------------------------------------------------\n");
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printf("uid.................. %08x\n", uid);
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printf("partial key.......... %08x\n", part_key);
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printf("nt enc............... %08x\n", nt_enc);
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printf("nr enc............... %08x\n", nr_enc);
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printf("next encrypted cmd... %s\n", sprint_hex_inrow_ex(enc, enc_len, 0));
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uint64_t t1 = msclock();
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#if !defined(_WIN32) || !defined(__WIN32__)
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thread_count = sysconf(_SC_NPROCESSORS_CONF);
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if (thread_count < 2)
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thread_count = 2;
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#endif /* _WIN32 */
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printf("\nBruteforce using %d threads to find upper 16bits of key\n", thread_count);
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pthread_t threads[thread_count];
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// create a mutex to avoid interlacing print commands from our different threads
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pthread_mutex_init(&print_lock, NULL);
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// threads
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for (int i = 0; i < thread_count; ++i) {
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struct thread_args *a = calloc(1, sizeof(struct thread_args));
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a->thread = i;
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a->idx = i;
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a->uid = uid;
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a->part_key = part_key;
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a->nt_enc = nt_enc;
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a->nr_enc = nr_enc;
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a->enc_len = enc_len;
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memcpy(a->enc, enc, enc_len);
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pthread_create(&threads[i], NULL, brute_thread, (void *)a);
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}
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// wait for threads to terminate:
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for (int i = 0; i < thread_count; ++i)
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pthread_join(threads[i], NULL);
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if (global_found == false) {
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printf("\nFailed to find a key\n\n");
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}
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t1 = msclock() - t1;
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if (t1 > 0)
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printf("execution time " _YELLOW_("%.2f") " sec\n", (float)t1 / 1000.0);
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// clean up mutex
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pthread_mutex_destroy(&print_lock);
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return 0;
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}
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