mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-09-21 07:46:12 +08:00
668 lines
19 KiB
C
668 lines
19 KiB
C
#define __STDC_FORMAT_MACROS
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#if !defined(_WIN64)
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#if defined(_WIN32) || defined(__WIN32__)
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# define _USE_32BIT_TIME_T 1
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#endif
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#endif
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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 <time.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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#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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#define odd_parity(i) (( (i) ^ (i)>>1 ^ (i)>>2 ^ (i)>>3 ^ (i)>>4 ^ (i)>>5 ^ (i)>>6 ^ (i)>>7 ^ 1) & 0x01)
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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 options here
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uint32_t uid = 0; // serial number
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uint32_t nt_enc = 0; // Encrypted tag nonce
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uint32_t nr_enc = 0; // encrypted reader challenge
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uint32_t ar_enc = 0; // encrypted reader response
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uint32_t at_enc = 0; // encrypted tag response
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uint32_t cmd_enc = 0; // next encrypted command to sector
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uint32_t nt_par_err = 0;
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uint32_t ar_par_err = 0;
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uint32_t at_par_err = 0;
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typedef struct thread_args {
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uint16_t xored;
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int thread;
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int idx;
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bool ev1;
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} targs;
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#define ENC_LEN (200)
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typedef struct thread_key_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_key;
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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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int global_counter = 0;
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int global_found = 0;
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int global_found_candidate = 0;
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uint64_t global_candiate_key = 0;
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size_t 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 dont 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 = (char *)buf;
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size_t i;
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memset(tmp, 0x00, hex_max_len);
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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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sprintf(tmp, (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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sprintf(tmp + 2 + j, " ");
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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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sprintf(tmp, " ");
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// remove last space
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*tmp = '\0';
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return;
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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 uint16_t parity_from_err(uint32_t data, uint16_t par_err) {
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uint16_t par = 0;
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par |= odd_parity((data >> 24) & 0xFF) ^ ((par_err >> 12) & 1);
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par <<= 4;
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par |= odd_parity((data >> 16) & 0xFF) ^ ((par_err >> 8) & 1);
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par <<= 4;
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par |= odd_parity((data >> 8) & 0xFF) ^ ((par_err >> 4) & 1);
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par <<= 4;
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par |= odd_parity(data & 0xFF) ^ (par_err & 1);
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return par;
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}
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static uint16_t xored_bits(uint16_t nt_par, uint32_t ntenc, uint16_t ar_par, uint32_t arenc, uint16_t at_par, uint32_t atenc) {
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uint16_t xored = 0;
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uint8_t par;
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//1st (1st nt)
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par = (nt_par >> 12) & 1;
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xored |= par ^ ((ntenc >> 16) & 1);
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xored <<= 1;
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//2nd (2nd nt)
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par = (nt_par >> 8) & 1;
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xored |= par ^ ((ntenc >> 8) & 1);
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xored <<= 1;
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//3rd (3rd nt)
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par = (nt_par >> 4) & 1;
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xored |= par ^ (ntenc & 1);
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xored <<= 1;
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//4th (1st ar)
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par = (ar_par >> 12) & 1;
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xored |= par ^ ((arenc >> 16) & 1);
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xored <<= 1;
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//5th (2nd ar)
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par = (ar_par >> 8) & 1;
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xored |= par ^ ((arenc >> 8) & 1);
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xored <<= 1;
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//6th (3rd ar)
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par = (ar_par >> 4) & 1;
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xored |= par ^ (arenc & 1);
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xored <<= 1;
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//7th (4th ar)
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par = ar_par & 1;
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xored |= par ^ ((atenc >> 24) & 1);
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xored <<= 1;
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//8th (1st at)
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par = (at_par >> 12) & 1;
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xored |= par ^ ((atenc >> 16) & 1);
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xored <<= 1;
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//9th (2nd at)
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par = (at_par >> 8) & 1;
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xored |= par ^ ((atenc >> 8) & 1);
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xored <<= 1;
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//10th (3rd at)
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par = (at_par >> 4) & 1;
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xored |= par ^ (atenc & 1);
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return xored;
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}
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static bool candidate_nonce(uint32_t xored, uint32_t nt, bool ev1) {
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uint8_t byte, check;
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if (!ev1) {
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//1st (1st nt)
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byte = (nt >> 24) & 0xFF;
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check = odd_parity(byte) ^ ((nt >> 16) & 1) ^ ((xored >> 9) & 1);
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if (check) return false;
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//2nd (2nd nt)
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byte = (nt >> 16) & 0xFF;
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check = odd_parity(byte) ^ ((nt >> 8) & 1) ^ ((xored >> 8) & 1);
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if (check) return false;
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}
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//3rd (3rd nt)
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byte = (nt >> 8) & 0xFF;
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check = odd_parity(byte) ^ (nt & 1) ^ ((xored >> 7) & 1);
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if (check) return false;
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uint32_t ar = prng_successor(nt, 64);
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//4th (1st ar)
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byte = (ar >> 24) & 0xFF;
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check = odd_parity(byte) ^ ((ar >> 16) & 1) ^ ((xored >> 6) & 1);
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if (check) return false;
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//5th (2nd ar)
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byte = (ar >> 16) & 0x0FF;
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check = odd_parity(byte) ^ ((ar >> 8) & 1) ^ ((xored >> 5) & 1);
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if (check) return false;
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//6th (3rd ar)
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byte = (ar >> 8) & 0xFF;
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check = odd_parity(byte) ^ (ar & 1) ^ ((xored >> 4) & 1);
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if (check) return false;
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uint32_t at = prng_successor(nt, 96);
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//7th (4th ar)
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byte = ar & 0xFF;
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check = odd_parity(byte) ^ ((at >> 24) & 1) ^ ((xored >> 3) & 1);
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if (check) return false;
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//8th (1st at)
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byte = (at >> 24) & 0xFF;
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check = odd_parity(byte) ^ ((at >> 16) & 1) ^ ((xored >> 2) & 1);
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if (check) return false;
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//9th (2nd at)
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byte = (at >> 16) & 0xFF;
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check = odd_parity(byte) ^ ((at >> 8) & 1) ^ ((xored >> 1) & 1) ;
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if (check) return false;
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//10th (3rd at)
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byte = (at >> 8) & 0xFF;
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check = odd_parity(byte) ^ (at & 1) ^ (xored & 1);
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if (check) return false;
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return true;
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}
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static bool checkValidCmd(uint32_t decrypted) {
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uint8_t cmd = (decrypted >> 24) & 0xFF;
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for (int i = 0; i < 8; ++i) {
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if (cmd == cmds[i][0])
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return true;
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}
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return false;
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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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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 bool checkCRC(uint32_t decrypted) {
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uint8_t data[] = {
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(decrypted >> 24) & 0xFF,
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(decrypted >> 16) & 0xFF,
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(decrypted >> 8) & 0xFF,
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decrypted & 0xFF
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};
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return CheckCrc14443(CRC_14443_A, data, sizeof(data));
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}
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static void *brute_thread(void *arguments) {
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//int shift = (int)arg;
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struct thread_args *args = (struct thread_args *) arguments;
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struct Crypto1State *revstate = NULL;
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uint64_t key; // recovered key candidate
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uint32_t ks2; // keystream used to encrypt reader response
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uint32_t ks3; // keystream used to encrypt tag response
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uint32_t ks4; // keystream used to encrypt next command
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uint32_t nt; // current tag nonce
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uint32_t p64 = 0;
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uint32_t count;
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// TC == 4 (
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// threads calls 0 ev1 == false
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// threads calls 0,1,2 ev1 == true
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for (count = args->idx; count < 0xFFFF; count += thread_count - 1) {
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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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nt = count << 16 | prng_successor(count, 16);
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if (!candidate_nonce(args->xored, nt, args->ev1))
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continue;
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p64 = prng_successor(nt, 64);
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ks2 = ar_enc ^ p64;
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ks3 = at_enc ^ prng_successor(p64, 32);
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revstate = lfsr_recovery64(ks2, ks3);
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ks4 = crypto1_word(revstate, 0, 0);
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if (ks4 != 0) {
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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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if (args->ev1)
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printf("\n**** Possible key candidate ****\n");
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#if 0
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printf("thread #%d idx %d %s\n", args->thread, args->idx, (args->ev1) ? "(Ev1)" : "");
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printf("current nt(%08x) ar_enc(%08x) at_enc(%08x)\n", nt, ar_enc, at_enc);
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printf("ks2:%08x\n", ks2);
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printf("ks3:%08x\n", ks3);
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printf("ks4:%08x\n", ks4);
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#endif
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if (cmd_enc) {
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uint32_t decrypted = ks4 ^ cmd_enc;
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printf("CMD enc( %08x )\n", cmd_enc);
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printf(" dec( %08x ) ", decrypted);
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// check if cmd exists
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uint8_t isOK = checkValidCmd(decrypted);
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(void)isOK;
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// Add a crc-check.
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isOK = checkCRC(decrypted);
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if (isOK == false) {
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printf(_RED_("<-- not a valid cmd\n"));
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pthread_mutex_unlock(&print_lock);
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free(revstate);
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continue;
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} else {
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printf("<-- valid cmd\n");
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}
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}
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lfsr_rollback_word(revstate, 0, 0);
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lfsr_rollback_word(revstate, 0, 0);
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lfsr_rollback_word(revstate, 0, 0);
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lfsr_rollback_word(revstate, nr_enc, 1);
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lfsr_rollback_word(revstate, uid ^ nt, 0);
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crypto1_get_lfsr(revstate, &key);
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free(revstate);
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if (args->ev1) {
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// if it was EV1, we know for sure xxxAAAAAAAA recovery
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printf("\nKey candidate [ " _YELLOW_("....%08" PRIx64 )" ]\n\n", key & 0xFFFFFFFF);
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__sync_fetch_and_add(&global_found_candidate, 1);
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} else {
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printf("\nKey candidate [ " _GREEN_("....%08" PRIx64) " ]\n\n", key & 0xFFFFFFFF);
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__sync_fetch_and_add(&global_found, 1);
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}
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__sync_fetch_and_add(&global_candiate_key, key);
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//release lock
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pthread_mutex_unlock(&print_lock);
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break;
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}
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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 void *brute_key_thread(void *arguments) {
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struct thread_key_args *args = (struct thread_key_args *) arguments;
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uint64_t 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 | args->part_key);
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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_deinit(pcs);
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// check if cmd exists
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uint8_t isOK = checkValidCmdByte(dec, args->enc_len);
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if (isOK == false) {
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continue;
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}
|
|
|
|
// lock this section to avoid interlacing prints from different threats
|
|
pthread_mutex_lock(&print_lock);
|
|
printf("\nenc: %s\n", sprint_hex_inrow_ex(local_enc, args->enc_len, 0));
|
|
printf("dec: %s\n", sprint_hex_inrow_ex(dec, args->enc_len, 0));
|
|
printf("\nValid Key found [ " _GREEN_("%012" PRIx64) " ]\n\n", key);
|
|
pthread_mutex_unlock(&print_lock);
|
|
__sync_fetch_and_add(&global_found, 1);
|
|
break;
|
|
}
|
|
free(args);
|
|
return NULL;
|
|
}
|
|
|
|
static int usage(void) {
|
|
printf("\n");
|
|
printf("syntax: mf_nonce_brute <uid> <nt> <nt_par_err> <nr> <ar> <ar_par_err> <at> <at_par_err> [<next_command>]\n\n");
|
|
printf("how to convert trace data to needed input:\n");
|
|
printf(" nt in trace = 8c! 42 e6! 4e!\n");
|
|
printf(" nt = 8c42e64e\n");
|
|
printf(" nt_par_err = 1011\n\n");
|
|
printf("samples:\n");
|
|
printf("\n");
|
|
printf(" ./mf_nonce_brute fa247164 fb47c594 0000 71909d28 0c254817 1000 0dc7cfbd 1110\n");
|
|
printf("\n");
|
|
printf("**** Possible key candidate ****\n");
|
|
printf("Key candidate: [ffffffffffff]\n");
|
|
printf("\n");
|
|
printf(" ./mf_nonce_brute 96519578 d7e3c6ac 0011 cd311951 9da49e49 0010 2bb22e00 0100 a4f7f398ebdb4e484d1cb2b174b939d18b469f3fa5d9caab\n");
|
|
printf("\n");
|
|
printf("enc: A4F7F398EBDB4E484D1CB2B174B939D18B469F3FA5D9CAABBFA018EC7E0CC5721DE2E590F64BD0A5B4EFCE71\n");
|
|
printf("dec: 30084A24302F8102F44CA5020500A60881010104763930084A24302F8102F44CA5020500A608810101047639\n");
|
|
printf("Valid Key found: [3b7e4fd575ad]\n\n");
|
|
return 1;
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
printf("\nMifare classic nested auth key recovery\n\n");
|
|
|
|
if (argc < 9) return usage();
|
|
|
|
sscanf(argv[1], "%x", &uid);
|
|
sscanf(argv[2], "%x", &nt_enc);
|
|
sscanf(argv[3], "%x", &nt_par_err);
|
|
sscanf(argv[4], "%x", &nr_enc);
|
|
sscanf(argv[5], "%x", &ar_enc);
|
|
sscanf(argv[6], "%x", &ar_par_err);
|
|
sscanf(argv[7], "%x", &at_enc);
|
|
sscanf(argv[8], "%x", &at_par_err);
|
|
|
|
int enc_len = 0;
|
|
uint8_t enc[ENC_LEN] = {0}; // next encrypted command + a full read/write
|
|
if (argc > 9) {
|
|
// sscanf(argv[9], "%x", &cmd_enc);
|
|
param_gethex_to_eol(argv[9], 0, enc, sizeof(enc), &enc_len);
|
|
cmd_enc = (enc[0] << 24 | enc[1] << 16 | enc[2] << 8 | enc[3]);
|
|
}
|
|
|
|
printf("----------- " _CYAN_("Phase 1") " ------------------------\n");
|
|
printf("uid.................. %08x\n", uid);
|
|
printf("nt encrypted......... %08x\n", nt_enc);
|
|
printf("nt parity err........ %04x\n", nt_par_err);
|
|
printf("nr encrypted......... %08x\n", nr_enc);
|
|
printf("ar encrypted......... %08x\n", ar_enc);
|
|
printf("ar parity err........ %04x\n", ar_par_err);
|
|
printf("at encrypted......... %08x\n", at_enc);
|
|
printf("at parity err........ %04x\n", at_par_err);
|
|
|
|
if (argc > 9) {
|
|
printf("next encrypted cmd... %s\n", sprint_hex_inrow_ex(enc, enc_len ,0));
|
|
}
|
|
|
|
clock_t t1 = clock();
|
|
uint16_t nt_par = parity_from_err(nt_enc, nt_par_err);
|
|
uint16_t ar_par = parity_from_err(ar_enc, ar_par_err);
|
|
uint16_t at_par = parity_from_err(at_enc, at_par_err);
|
|
|
|
//calc (parity XOR corresponding nonce bit encoded with the same keystream bit)
|
|
uint16_t xored = xored_bits(nt_par, nt_enc, ar_par, ar_enc, at_par, at_enc);
|
|
|
|
#if !defined(_WIN32) || !defined(__WIN32__)
|
|
thread_count = sysconf(_SC_NPROCESSORS_CONF);
|
|
if (thread_count < 2)
|
|
thread_count = 2;
|
|
#endif /* _WIN32 */
|
|
|
|
printf("\nBruteforce using " _YELLOW_("%zu") " threads to find encrypted tagnonce last bytes\n", thread_count);
|
|
|
|
pthread_t threads[thread_count];
|
|
|
|
// create a mutex to avoid interlacing print commands from our different threads
|
|
pthread_mutex_init(&print_lock, NULL);
|
|
|
|
// one thread T0 for none EV1.
|
|
struct thread_args *a = malloc(sizeof(struct thread_args));
|
|
a->xored = xored;
|
|
a->thread = 0;
|
|
a->idx = 0;
|
|
a->ev1 = false;
|
|
pthread_create(&threads[0], NULL, brute_thread, (void *)a);
|
|
|
|
// the rest of available threads to EV1 scenario
|
|
for (int i = 0; i < thread_count - 1; ++i) {
|
|
struct thread_args *b = malloc(sizeof(struct thread_args));
|
|
b->xored = xored;
|
|
b->thread = i + 1;
|
|
b->idx = i;
|
|
b->ev1 = true;
|
|
pthread_create(&threads[i + 1], NULL, brute_thread, (void *)b);
|
|
}
|
|
|
|
// wait for threads to terminate:
|
|
for (int i = 0; i < thread_count; ++i)
|
|
pthread_join(threads[i], NULL);
|
|
|
|
t1 = clock() - t1;
|
|
printf("execution time %.2f sec\n", (float)t1 / 1000000.0);
|
|
|
|
|
|
if (!global_found && !global_found_candidate) {
|
|
printf("\nFailed to find a key\n\n");
|
|
goto out;
|
|
}
|
|
|
|
if (enc_len < 4) {
|
|
printf("Too few next cmd bytes, skipping phase 2\n");
|
|
goto out;
|
|
}
|
|
|
|
// reset thread signals
|
|
global_found = 0;
|
|
global_found_candidate = 0;
|
|
|
|
printf("\n----------- " _CYAN_("Phase 2") " ------------------------\n");
|
|
printf("uid.......... %08x\n", uid);
|
|
printf("partial key.. %08x\n", (uint32_t)(global_candiate_key & 0xFFFFFFFF));
|
|
printf("nt enc....... %08x\n", nt_enc);
|
|
printf("nr enc....... %08x\n", nr_enc);
|
|
printf("next encrypted cmd: %s\n", sprint_hex_inrow_ex(enc, enc_len ,0));
|
|
printf("\nStart bruteforce to find upper 16 bits of key\n");
|
|
fflush(stdout);
|
|
|
|
// threads
|
|
for (int i = 0; i < thread_count; ++i) {
|
|
struct thread_key_args *b = malloc(sizeof(struct thread_key_args));
|
|
b->thread = i;
|
|
b->idx = i;
|
|
b->uid = uid;
|
|
b->part_key = (uint32_t)(global_candiate_key & 0xFFFFFFFF);
|
|
b->nt_enc = nt_enc;
|
|
b->nr_enc = nr_enc;
|
|
b->enc_len = enc_len;
|
|
memcpy(b->enc, enc, enc_len);
|
|
pthread_create(&threads[i], NULL, brute_key_thread, (void *)b);
|
|
}
|
|
|
|
// wait for threads to terminate:
|
|
for (int i = 0; i < thread_count; ++i)
|
|
pthread_join(threads[i], NULL);
|
|
|
|
if (!global_found && !global_found_candidate) {
|
|
printf("\nFailed to find a key\n\n");
|
|
}
|
|
|
|
out:
|
|
// clean up mutex
|
|
pthread_mutex_destroy(&print_lock);
|
|
return 0;
|
|
}
|