mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2026-05-12 11:18:11 -07:00
Add mfulc_counterfeit_recovery script and mfulc_des_brute tool
This commit is contained in:
noproto
Philippe Teuwen
@@ -29,7 +29,7 @@ ifneq (,$(DESTDIR))
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endif
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endif
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all clean install uninstall check: %: client/% bootrom/% armsrc/% recovery/% mfc_card_only/% mfc_card_reader/% mfd_aes_brute/% fpga_compress/% cryptorf/%
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all clean install uninstall check: %: client/% bootrom/% armsrc/% recovery/% mfc_card_only/% mfc_card_reader/% mfd_aes_brute/% mfulc_des_brute/% fpga_compress/% cryptorf/%
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# hitag2crack toolsuite is not yet integrated in "all", it must be called explicitly: "make hitag2crack"
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#all clean install uninstall check: %: hitag2crack/%
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clean: %: hitag2crack/%
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@@ -157,6 +157,9 @@ mfc_card_only/%: FORCE
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mfc_card_reader/%: FORCE
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$(info [*] MAKE $@)
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$(Q)$(MAKE) --no-print-directory -C tools/mfc/card_reader $(patsubst mfc_card_reader/%,%,$@) DESTDIR=$(MYDESTDIR)
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mfulc_des_brute/%: FORCE
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$(info [*] MAKE $@)
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$(Q)$(MAKE) --no-print-directory -C tools/mfulc_des_brute $(patsubst mfulc_des_brute/%,%,$@) DESTDIR=$(MYDESTDIR)
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mfd_aes_brute/%: FORCE
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$(info [*] MAKE $@)
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$(Q)$(MAKE) --no-print-directory -C tools/mfd_aes_brute $(patsubst mfd_aes_brute/%,%,$@) DESTDIR=$(MYDESTDIR)
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@@ -182,7 +185,7 @@ hitag2crack/%: FORCE
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$(Q)$(MAKE) --no-print-directory -C tools/hitag2crack $(patsubst hitag2crack/%,%,$@) DESTDIR=$(MYDESTDIR)
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FORCE: # Dummy target to force remake in the subdirectories, even if files exist (this Makefile doesn't know about the prerequisites)
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.PHONY: all clean install uninstall help _test bootrom fullimage recovery client mfc_card_only mfc_card_reader mfd_aes_brute hitag2crack style miscchecks release FORCE udev accessrights cleanifplatformchanged
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.PHONY: all clean install uninstall help _test bootrom fullimage recovery client mfc_card_only mfc_card_reader mfulc_des_brute mfd_aes_brute hitag2crack style miscchecks release FORCE udev accessrights cleanifplatformchanged
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help:
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@echo "Multi-OS Makefile"
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@@ -202,6 +205,7 @@ help:
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@echo "+ cryptorf - Make tools/cryptorf"
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@echo "+ mfc_card_only - Make tools/mfc/card_only"
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@echo "+ mfc_card_reader - Make tools/mfc/card_reader"
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@echo "+ mfulc_des_brute - Make tools/mfulc_des_brute"
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@echo "+ mfd_aes_brute - Make tools/mfd_aes_brute"
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@echo "+ hitag2crack - Make tools/hitag2crack"
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@echo "+ fpga_compress - Make tools/fpga_compress"
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@@ -246,6 +250,8 @@ mfc_card_only: mfc_card_only/all
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mfc_card_reader: mfc_card_reader/all
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mfulc_des_brute: mfulc_des_brute/all
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mfd_aes_brute: mfd_aes_brute/all
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fpga_compress: fpga_compress/all
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+505
File diff suppressed because it is too large
Load Diff
@@ -0,0 +1,27 @@
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MYCFLAGS = -D_GNU_SOURCE -O3 -Wno-deprecated-declarations
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MYLDLIBS = -lcrypto -lpthread
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BINS = mfulc_des_brute
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INSTALLTOOLS = $(BINS)
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include ../../Makefile.host
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# checking platform can be done only after Makefile.host
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ifneq (,$(findstring MINGW,$(platform)))
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# Mingw uses by default Microsoft printf, we want the GNU printf (e.g. for %z)
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# and setting _ISOC99_SOURCE sets internally __USE_MINGW_ANSI_STDIO=1
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MYCFLAGS += -D_ISOC99_SOURCE
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endif
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# OS X needs linking to openssl
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ifeq ($(USE_BREW),1)
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MYCFLAGS += -I$(BREW_PREFIX)/opt/openssl@3/include -I$(BREW_PREFIX)/opt/openssl@3.5/include
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MYLDFLAGS += -L$(BREW_PREFIX)/opt/openssl@3/lib -L$(BREW_PREFIX)/opt/openssl@3.5/lib
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endif
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ifeq ($(USE_MACPORTS),1)
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MYCFLAGS += -I$(MACPORTS_PREFIX)/include/openssl-3 -I$(MACPORTS_PREFIX)/include/openssl-1.1
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MYLDFLAGS += -L$(MACPORTS_PREFIX)/lib/openssl-3 -L$(MACPORTS_PREFIX)/lib/openssl-1.1
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endif
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mfulc_des_brute : $(OBJDIR)/mfulc_des_brute.o $(MYOBJS)
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@@ -0,0 +1,368 @@
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// noproto & doegox, 2025
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// cf "BREAKMEIFYOUCAN!: Exploiting Keyspace Reduction and Relay Attacks in 3DES and AES-protected NFC Technologies"
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// for more info
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.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 <openssl/des.h>
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#define BLOCK_SIZE 8 // DES (and 3DES) block size in bytes
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#define KEY_SIZE 16 // Full 2TDEA key size (K1 || K2)
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#define BENCHMARK_FULL_KEYSPACE 0
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// Global flag to signal that a key has been found.
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volatile int key_found = 0;
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typedef enum {
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LFSR_UNDEF = 0,
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LFSR_ULCG = 1,
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LFSR_USCUIDUL = 2
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} lfsr_t;
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typedef struct {
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uint32_t start; // starting candidate (inclusive)
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uint32_t end; // ending candidate (exclusive)
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int key_mode; // 0 to 3 (i.e. brute force segment 1-4 as 0-indexed)
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unsigned char init_ciphertext[BLOCK_SIZE];
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unsigned char prev_ciphertext[BLOCK_SIZE]; // "IV" of ciphertext for CBC mode in reader mode
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unsigned char ciphertext[BLOCK_SIZE];
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unsigned char base_key[KEY_SIZE]; // the 3DES base key provided by the user
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int thread_id;
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lfsr_t lfsr_type;
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bool is_reader_mode; // true for -r mode, false for -c mode
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} thread_args_t;
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// Converts a hex string to bytes. The hex string must be exactly 2*len hex digits long.
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static int hex_to_bytes(const char *hex, unsigned char *buf, size_t len) {
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if (strlen(hex) != len * 2)
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return 0;
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for (size_t i = 0; i < len; i++) {
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unsigned int byte;
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if (sscanf(hex + 2 * i, "%2x", &byte) != 1)
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return 0;
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buf[i] = (unsigned char) byte;
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}
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return 1;
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}
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// Print a byte array as hex.
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static void print_hex(const unsigned char *buf, size_t len) {
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for (size_t i = 0; i < len; i++)
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printf("%02X", buf[i]);
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printf("\n");
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}
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static bool valid_lfsr_ulcg(uint64_t x64) {
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x64 = __builtin_bswap64(x64);
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uint16_t x16 = x64 >> 48;
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x16 = x16 << 15 | ((x16 >> 1) ^ ((x16 >> 3 ^ x16 >> 4 ^ x16 >> 6) & 1));
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if (x16 != ((x64 >> 32) & 0xFFFF)) return false;
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x16 = x16 << 15 | ((x16 >> 1) ^ ((x16 >> 3 ^ x16 >> 4 ^ x16 >> 6) & 1));
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if (x16 != ((x64 >> 16) & 0xFFFF)) return false;
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x16 = x16 << 15 | ((x16 >> 1) ^ ((x16 >> 3 ^ x16 >> 4 ^ x16 >> 6) & 1));
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if (x16 != (x64 & 0xFFFF)) return false;
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return true;
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}
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static bool valid_lfsr_uscuidul(uint64_t x64) {
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x64 = __builtin_bswap64(x64);
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uint16_t x16 = x64 & 0xFFFF;
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for (int i = 0; i < 16; i++) x16 = x16 >> 1 | (x16 ^ x16 >> 2 ^ x16 >> 3 ^ x16 >> 5) << 15;
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if (x16 != ((x64 >> 16) & 0xFFFF)) return false;
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for (int i = 0; i < 16; i++) x16 = x16 >> 1 | (x16 ^ x16 >> 2 ^ x16 >> 3 ^ x16 >> 5) << 15;
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if (x16 != ((x64 >> 32) & 0xFFFF)) return false;
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for (int i = 0; i < 16; i++) x16 = x16 >> 1 | (x16 ^ x16 >> 2 ^ x16 >> 3 ^ x16 >> 5) << 15;
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if (x16 != ((x64 >> 48) & 0xFFFF)) return false;
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return true;
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}
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static bool valid_lfsr(uint64_t x64, lfsr_t lfsr_type) {
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switch (lfsr_type) {
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case LFSR_ULCG:
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return valid_lfsr_ulcg(x64);
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case LFSR_USCUIDUL:
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return valid_lfsr_uscuidul(x64);
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case LFSR_UNDEF:
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default:
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return false;
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}
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}
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static lfsr_t detect_lfsr_type(unsigned char *init_ciphertext) {
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DES_cblock fixed_key = {0};
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DES_key_schedule fixed_schedule;
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DES_set_key_unchecked(&fixed_key, &fixed_schedule);
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uint64_t out;
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DES_ecb_encrypt((DES_cblock *)init_ciphertext, (DES_cblock *)&out, &fixed_schedule, DES_DECRYPT);
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if (valid_lfsr_ulcg(out)) {
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return LFSR_ULCG;
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} else if (valid_lfsr_uscuidul(out)) {
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return LFSR_USCUIDUL;
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}
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return LFSR_UNDEF;
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}
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// Worker thread function using low-level DES functions.
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static void *worker(void *arg) {
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thread_args_t *targs = (thread_args_t *) arg;
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uint32_t start = targs->start;
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uint32_t end = targs->end;
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int key_mode = targs->key_mode;
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// Determine which half is being brute forced.
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// For key_mode 0 or 1 the candidate is in K1; for key_mode 2 or 3 the candidate is in K2.
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int candidate_in_K1 = (key_mode < 2) ? 1 : 0;
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// Determine the 4-byte offset within the variable half:
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// For K1, key_mode 0 means segment1 (offset 0), key_mode 1 means segment2 (offset 4).
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// For K2, key_mode 2 means segment3 (offset 0), key_mode 3 means segment4 (offset 4).
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int var_offset = candidate_in_K1 ? ((key_mode % 2) * 4) : (((key_mode - 2) % 2) * 4);
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// Precompute the fixed half's DES key schedule.
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DES_cblock fixed_key;
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if (candidate_in_K1) {
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// Fixed half is K2: bytes 8..15 of base_key.
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memcpy(fixed_key, targs->base_key + 8, 8);
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} else {
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// Candidate in K2; fixed half is K1: bytes 0..7 of base_key.
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memcpy(fixed_key, targs->base_key, 8);
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}
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DES_key_schedule fixed_schedule;
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DES_set_key_unchecked(&fixed_key, &fixed_schedule);
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uint64_t out;
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uint64_t init_out;
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// For the candidate half, start with the corresponding half from the base key.
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unsigned char base_half[8];
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if (candidate_in_K1)
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memcpy(base_half, targs->base_key, 8);
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else
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memcpy(base_half, targs->base_key + 8, 8);
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// Loop over the candidate key indices in this thread's range.
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for (uint32_t idx = start; idx < end; idx++) {
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if (key_found && !BENCHMARK_FULL_KEYSPACE)
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break; // Some other thread already found the key.
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// Convert the candidate index (28 bits) into 4 bytes.
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// Each candidate byte is constructed from a 7-bit chunk shifted left by 1 so that the LSB is zero.
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uint8_t b0 = ((idx) & 0x7F) << 1;
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uint8_t b1 = ((idx >> 7) & 0x7F) << 1;
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uint8_t b2 = ((idx >> 14) & 0x7F) << 1;
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uint8_t b3 = ((idx >> 21) & 0x7F) << 1;
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// Build the candidate half key by starting with the fixed base half and substituting candidate bytes.
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DES_cblock candidate_half;
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memcpy(candidate_half, base_half, 8);
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candidate_half[var_offset ] = b0;
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candidate_half[var_offset + 1] = b1;
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candidate_half[var_offset + 2] = b2;
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candidate_half[var_offset + 3] = b3;
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// Compute the candidate half's DES key schedule.
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DES_key_schedule candidate_schedule;
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DES_set_key_unchecked(&candidate_half, &candidate_schedule);
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// Perform 2-key triple DES decryption on the ciphertext.
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// If candidate is in K1: decryption = DES_ecb3_encrypt(cipher, out, candidate, fixed, candidate, DES_DECRYPT)
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// If candidate is in K2: decryption = DES_ecb3_encrypt(cipher, out, fixed, candidate, fixed, DES_DECRYPT)
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if (candidate_in_K1) {
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DES_ecb3_encrypt((DES_cblock *)targs->ciphertext, (DES_cblock *)&out,
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&candidate_schedule, &fixed_schedule, &candidate_schedule, DES_DECRYPT);
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} else {
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DES_ecb3_encrypt((DES_cblock *)targs->ciphertext, (DES_cblock *)&out,
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&fixed_schedule, &candidate_schedule, &fixed_schedule, DES_DECRYPT);
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}
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bool match = false;
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if (targs->is_reader_mode) {
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// In reader mode, also decrypt init_ciphertext and check for rotation relationship
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// Apply XOR block to the second decrypted block (for CBC mode)
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if (candidate_in_K1) {
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DES_ecb3_encrypt((DES_cblock *)targs->init_ciphertext, (DES_cblock *)&init_out,
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&candidate_schedule, &fixed_schedule, &candidate_schedule, DES_DECRYPT);
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} else {
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DES_ecb3_encrypt((DES_cblock *)targs->init_ciphertext, (DES_cblock *)&init_out,
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&fixed_schedule, &candidate_schedule, &fixed_schedule, DES_DECRYPT);
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}
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// Apply XOR block to the second decrypted block (for CBC mode)
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out ^= *(uint64_t *)targs->prev_ciphertext;
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// Check if out is 8-bit (1-byte) left rotated version of init_out
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// Need to convert to big-endian for byte rotation, then back to little-endian
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uint64_t init_be = __builtin_bswap64(init_out);
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uint64_t rotated_be = (init_be << 8) | (init_be >> 56);
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uint64_t rotated = __builtin_bswap64(rotated_be);
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match = (out == rotated);
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} else {
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// In counterfeit mode, check the resulting plaintext against LFSR
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match = valid_lfsr(out, targs->lfsr_type);
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}
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if (match) {
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key_found = 1; // signal to other threads
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// Build the full 16-byte key: start with the base key and substitute the candidate 4 bytes.
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unsigned char full_key[KEY_SIZE];
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memcpy(full_key, targs->base_key, KEY_SIZE);
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int seg_offset = key_mode * 4; // key_mode: 0->bytes0, 1->bytes4, 2->bytes8, 3->bytes12.
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full_key[seg_offset] = b0;
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full_key[seg_offset + 1] = b1;
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full_key[seg_offset + 2] = b2;
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full_key[seg_offset + 3] = b3;
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printf("Thread %d: Found key index: %u\n", targs->thread_id, idx);
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printf("Full key (hex): ");
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print_hex(full_key, KEY_SIZE);
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if (!BENCHMARK_FULL_KEYSPACE)
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break;
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}
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}
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return NULL;
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}
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static void print_help_and_exit(const char *cmd_name) {
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fprintf(stderr,
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"Usage:\n"
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" * Counterfeit key recovery:\n"
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" %s -c <null key ERndB (8 hex digits)> <target key ERndB (8 hex digits)> <3DES base key hex (32 hex digits)> <key segment (1-4)> <num threads>\n"
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" * Reader nonce key recovery:\n"
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" %s -r <ERndB (8 hex digits)> <ERndARndB' (16 hex digits)> <3DES base key hex (32 hex digits)> <key segment (1-4)> <num threads>\n",
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cmd_name,
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cmd_name);
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exit(1);
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}
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int main(int argc, char **argv) {
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// Check for -c or -r flag first to determine expected argument count
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if (argc < 2) {
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print_help_and_exit(argv[0]);
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}
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bool is_reader_mode = false;
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if (strcmp(argv[1], "-c") == 0) {
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is_reader_mode = false;
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if (argc != 7) {
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fprintf(stderr, "Error: -c mode requires exactly 6 arguments\n");
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print_help_and_exit(argv[0]);
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}
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} else if (strcmp(argv[1], "-r") == 0) {
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is_reader_mode = true;
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if (argc != 7) {
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fprintf(stderr, "Error: -r mode requires exactly 6 arguments\n");
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print_help_and_exit(argv[0]);
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}
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} else {
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fprintf(stderr, "Error: first argument must be -c or -r\n");
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print_help_and_exit(argv[0]);
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}
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unsigned char init_ciphertext[BLOCK_SIZE];
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unsigned char tmp_blocks[2 * BLOCK_SIZE];
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unsigned char ciphertext[BLOCK_SIZE];
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unsigned char base_key[KEY_SIZE];
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if (is_reader_mode) {
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// In reader mode, the first ciphertext is ERndB and the second is ERndA|ERndB'
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if (!hex_to_bytes(argv[2], init_ciphertext, BLOCK_SIZE)) {
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fprintf(stderr, "Error: invalid ERndB hex string.\n");
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return 1;
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}
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if (!hex_to_bytes(argv[3], tmp_blocks, 2 * BLOCK_SIZE)) {
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fprintf(stderr, "Error: invalid ERndARndB' hex string.\n");
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return 1;
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}
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} else {
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// In counterfeit mode, both ciphertexts are just ciphertext blocks
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if (!hex_to_bytes(argv[2], init_ciphertext, BLOCK_SIZE)) {
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fprintf(stderr, "Error: invalid null key ERndB hex string.\n");
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return 1;
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}
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if (!hex_to_bytes(argv[3], ciphertext, BLOCK_SIZE)) {
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fprintf(stderr, "Error: invalid target key ERndB hex string.\n");
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return 1;
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}
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}
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if (!hex_to_bytes(argv[4], base_key, KEY_SIZE)) {
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fprintf(stderr, "Error: invalid 3DES base key hex string.\n");
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return 1;
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}
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int seg = atoi(argv[5]);
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if (seg < 1 || seg > 4) {
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fprintf(stderr, "Error: key segment must be between 1 and 4.\n");
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return 1;
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}
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int num_threads = atoi(argv[6]);
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if (num_threads < 1) {
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fprintf(stderr, "Error: number of threads must be at least 1.\n");
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||||
return 1;
|
||||
}
|
||||
|
||||
lfsr_t lfsr_type = LFSR_UNDEF;
|
||||
if (!is_reader_mode) {
|
||||
// Only detect LFSR type in counterfeit mode
|
||||
lfsr_type = detect_lfsr_type(init_ciphertext);
|
||||
switch (lfsr_type) {
|
||||
case LFSR_ULCG:
|
||||
printf("LFSR detection: ULCG\n");
|
||||
break;
|
||||
case LFSR_USCUIDUL:
|
||||
printf("LFSR detection: ULC_USCUIDUL\n");
|
||||
break;
|
||||
case LFSR_UNDEF:
|
||||
default:
|
||||
fprintf(stderr, "LFSR detection: Could not detect LFSR!!\n");
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
// key_mode is zero-indexed (0,1,2,3)
|
||||
int key_mode = seg - 1;
|
||||
|
||||
// Total candidate space: 2^28 keys.
|
||||
uint32_t total = (1UL << 28);
|
||||
uint32_t chunk = total / num_threads;
|
||||
uint32_t remainder = total % num_threads;
|
||||
|
||||
pthread_t *threads = malloc(num_threads * sizeof(pthread_t));
|
||||
thread_args_t *targs = malloc(num_threads * sizeof(thread_args_t));
|
||||
if (!threads || !targs) {
|
||||
fprintf(stderr, "Allocation error.\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
// Divide the candidate space as equally as possible among threads.
|
||||
uint32_t current = 0;
|
||||
for (int i = 0; i < num_threads; i++) {
|
||||
targs[i].start = current;
|
||||
targs[i].end = current + chunk;
|
||||
if (i == num_threads - 1)
|
||||
targs[i].end += remainder;
|
||||
targs[i].key_mode = key_mode;
|
||||
targs[i].lfsr_type = lfsr_type;
|
||||
targs[i].is_reader_mode = is_reader_mode;
|
||||
memcpy(targs[i].init_ciphertext, init_ciphertext, BLOCK_SIZE);
|
||||
if (is_reader_mode) {
|
||||
memcpy(targs[i].prev_ciphertext, tmp_blocks, BLOCK_SIZE);
|
||||
memcpy(targs[i].ciphertext, tmp_blocks + BLOCK_SIZE, BLOCK_SIZE);
|
||||
} else {
|
||||
memcpy(targs[i].ciphertext, ciphertext, BLOCK_SIZE);
|
||||
}
|
||||
memcpy(targs[i].base_key, base_key, KEY_SIZE);
|
||||
targs[i].thread_id = i;
|
||||
current = targs[i].end;
|
||||
pthread_create(&threads[i], NULL, worker, &targs[i]);
|
||||
}
|
||||
|
||||
for (int i = 0; i < num_threads; i++)
|
||||
pthread_join(threads[i], NULL);
|
||||
|
||||
if (!key_found)
|
||||
printf("No matching key was found.\n");
|
||||
|
||||
free(threads);
|
||||
free(targs);
|
||||
return 0;
|
||||
}
|
||||
Reference in New Issue
Block a user