mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2025-01-05 07:36:14 +08:00
325 lines
9.7 KiB
C
325 lines
9.7 KiB
C
//-----------------------------------------------------------------------------
|
|
// Merlok - June 2011
|
|
// Roel - Dec 2009
|
|
// Unknown author
|
|
//
|
|
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
|
|
// at your option, any later version. See the LICENSE.txt file for the text of
|
|
// the license.
|
|
//-----------------------------------------------------------------------------
|
|
// MIFARE Darkside hack
|
|
//-----------------------------------------------------------------------------
|
|
#include "nonce2key.h"
|
|
|
|
int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_t ks_info, uint64_t * key) {
|
|
struct Crypto1State *state;
|
|
uint32_t i, pos, rr = 0, nr_diff;
|
|
byte_t bt, ks3x[8], par[8][8];
|
|
|
|
// Reset the last three significant bits of the reader nonce
|
|
nr &= 0xffffff1f;
|
|
|
|
PrintAndLog("uid(%08x) nt(%08x) par(%016"llx") ks(%016"llx") nr(%08x)", uid, nt, par_info, ks_info, nr);
|
|
|
|
for ( pos = 0; pos < 8; pos++ ) {
|
|
ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
|
|
bt = (par_info >> (pos*8)) & 0xff;
|
|
|
|
for ( i = 0; i < 8; i++) {
|
|
par[7-pos][i] = (bt >> i) & 0x01;
|
|
}
|
|
}
|
|
|
|
PrintAndLog("+----+--------+---+-----+---------------+");
|
|
PrintAndLog("|diff|{nr} |ks3|ks3^5|parity |");
|
|
PrintAndLog("+----+--------+---+-----+---------------+");
|
|
for ( i = 0; i < 8; i++) {
|
|
nr_diff = nr | i << 5;
|
|
|
|
PrintAndLog("| %02x |%08x| %01x | %01x |%01x,%01x,%01x,%01x,%01x,%01x,%01x,%01x|",
|
|
i << 5, nr_diff, ks3x[i], ks3x[i]^5,
|
|
par[i][0], par[i][1], par[i][2], par[i][3],
|
|
par[i][4], par[i][5], par[i][6], par[i][7]);
|
|
|
|
}
|
|
PrintAndLog("+----+--------+---+-----+---------------+");
|
|
|
|
clock_t t1 = clock();
|
|
|
|
state = lfsr_common_prefix(nr, rr, ks3x, par);
|
|
lfsr_rollback_word(state, uid ^ nt, 0);
|
|
crypto1_get_lfsr(state, key);
|
|
crypto1_destroy(state);
|
|
|
|
t1 = clock() - t1;
|
|
if ( t1 > 0 ) PrintAndLog("Time in nonce2key: %.0f ticks", (float)t1);
|
|
return 0;
|
|
}
|
|
|
|
int compar_intA(const void * a, const void * b) {
|
|
if (*(int64_t*)b == *(int64_t*)a) return 0;
|
|
if (*(int64_t*)b > *(int64_t*)a) return 1;
|
|
return -1;
|
|
}
|
|
|
|
// call when PAR == 0, special attack? It seems to need two calls. with same uid, block, keytype
|
|
int nonce2key_ex(uint8_t blockno, uint8_t keytype, uint32_t uid, uint32_t nt, uint32_t nr, uint64_t ks_info, uint64_t * key) {
|
|
|
|
struct Crypto1State *state;
|
|
uint32_t i, pos, key_count;
|
|
uint8_t ks3x[8];
|
|
uint64_t key_recovered;
|
|
int64_t *state_s;
|
|
static uint8_t last_blockno;
|
|
static uint8_t last_keytype;
|
|
static uint32_t last_uid;
|
|
static int64_t *last_keylist;
|
|
|
|
if (last_uid != uid &&
|
|
last_blockno != blockno &&
|
|
last_keytype != keytype &&
|
|
last_keylist != NULL)
|
|
{
|
|
free(last_keylist);
|
|
last_keylist = NULL;
|
|
}
|
|
last_uid = uid;
|
|
last_blockno = blockno;
|
|
last_keytype = keytype;
|
|
|
|
// Reset the last three significant bits of the reader nonce
|
|
nr &= 0xffffff1f;
|
|
|
|
// split keystream into array
|
|
for (pos=0; pos<8; pos++) {
|
|
ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f;
|
|
}
|
|
|
|
// find possible states for this keystream
|
|
state = lfsr_common_prefix_ex(nr, ks3x);
|
|
|
|
if (!state) {
|
|
PrintAndLog("Failed getting states");
|
|
return 1;
|
|
}
|
|
|
|
state_s = (int64_t*)state;
|
|
|
|
uint32_t xored = uid ^ nt;
|
|
|
|
for (i = 0; (state) && ((state + i)->odd != -1); i++) {
|
|
lfsr_rollback_word(state + i, xored, 0);
|
|
crypto1_get_lfsr(state + i, &key_recovered);
|
|
*(state_s + i) = key_recovered;
|
|
}
|
|
|
|
qsort(state_s, i, sizeof(int64_t), compar_intA);
|
|
*(state_s + i) = -1;
|
|
|
|
// first call to this function. clear all other stuff and set new found states.
|
|
if (last_keylist == NULL) {
|
|
free(last_keylist);
|
|
last_keylist = state_s;
|
|
PrintAndLog("parity is all zero, testing special attack. First call, this attack needs at least two calls. Hold on...");
|
|
PrintAndLog("uid(%08x) nt(%08x) ks(%016"llx") nr(%08x)", uid, nt, ks_info, nr);
|
|
return 1;
|
|
}
|
|
|
|
PrintAndLog("uid(%08x) nt(%08x) ks(%016"llx") nr(%08x)", uid, nt, ks_info, nr);
|
|
|
|
//Create the intersection:
|
|
int64_t *p1, *p2, *p3;
|
|
p1 = p3 = last_keylist;
|
|
p2 = state_s;
|
|
|
|
while ( *p1 != -1 && *p2 != -1 ) {
|
|
if (compar_intA(p1, p2) == 0) {
|
|
PrintAndLog("p1:%"llx" p2:%"llx" p3:%"llx" key:%012"llx,(uint64_t)(p1-last_keylist),(uint64_t)(p2-state_s),(uint64_t)(p3-last_keylist),*p1);
|
|
*p3++ = *p1++;
|
|
p2++;
|
|
}
|
|
else {
|
|
while (compar_intA(p1, p2) == -1) ++p1;
|
|
while (compar_intA(p1, p2) == 1) ++p2;
|
|
}
|
|
}
|
|
key_count = p3 - last_keylist;
|
|
PrintAndLog("key_count: %d", key_count);
|
|
if ( key_count == 0 ){
|
|
free(state);
|
|
state = NULL;
|
|
return 0;
|
|
}
|
|
|
|
uint8_t retval = 1;
|
|
// Validate all key candidates with testing each of them with mfCheckKeys
|
|
uint8_t keyBlock[6] = {0,0,0,0,0,0};
|
|
uint64_t key64;
|
|
for (i = 0; i < key_count; i++) {
|
|
key64 = *(last_keylist + i);
|
|
num_to_bytes(key64, 6, keyBlock);
|
|
key64 = 0;
|
|
if (!mfCheckKeys(blockno, keytype, false, 1, keyBlock, &key64)) {
|
|
*key = key64;
|
|
retval = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
free(last_keylist);
|
|
last_keylist = NULL;
|
|
free(state);
|
|
state = NULL;
|
|
return retval;
|
|
}
|
|
|
|
// 32 bit recover key from 2 nonces
|
|
bool tryMfk32(nonces_t data, uint64_t *outputkey, bool verbose) {
|
|
struct Crypto1State *s,*t;
|
|
uint64_t outkey = 0;
|
|
uint64_t key=0; // recovered key
|
|
uint32_t uid = data.cuid;
|
|
uint32_t nt = data.nonce; // first tag challenge (nonce)
|
|
uint32_t nr0_enc = data.nr; // first encrypted reader challenge
|
|
uint32_t ar0_enc = data.ar; // first encrypted reader response
|
|
uint32_t nr1_enc = data.nr2; // second encrypted reader challenge
|
|
uint32_t ar1_enc = data.ar2; // second encrypted reader response
|
|
bool isSuccess = FALSE;
|
|
uint8_t counter = 0;
|
|
|
|
clock_t t1 = clock();
|
|
uint32_t p64 = prng_successor(nt, 64);
|
|
|
|
if ( verbose ) {
|
|
PrintAndLog("Recovering key for:");
|
|
PrintAndLog(" uid: %08x",uid);
|
|
PrintAndLog(" nt: %08x",nt);
|
|
PrintAndLog(" {nr_0}: %08x",nr0_enc);
|
|
PrintAndLog(" {ar_0}: %08x",ar0_enc);
|
|
PrintAndLog(" {nr_1}: %08x",nr1_enc);
|
|
PrintAndLog(" {ar_1}: %08x",ar1_enc);
|
|
PrintAndLog("\nLFSR succesors of the tag challenge:");
|
|
PrintAndLog(" nt': %08x", p64);
|
|
PrintAndLog(" nt'': %08x", prng_successor(p64, 32));
|
|
}
|
|
|
|
s = lfsr_recovery32(ar0_enc ^ p64, 0);
|
|
|
|
for(t = s; t->odd | t->even; ++t) {
|
|
lfsr_rollback_word(t, 0, 0);
|
|
lfsr_rollback_word(t, nr0_enc, 1);
|
|
lfsr_rollback_word(t, uid ^ nt, 0);
|
|
crypto1_get_lfsr(t, &key);
|
|
crypto1_word(t, uid ^ nt, 0);
|
|
crypto1_word(t, nr1_enc, 1);
|
|
if (ar1_enc == (crypto1_word(t, 0, 0) ^ p64)) {
|
|
outkey = key;
|
|
++counter;
|
|
if (counter==20) break;
|
|
}
|
|
}
|
|
isSuccess = (counter > 0);
|
|
t1 = clock() - t1;
|
|
if ( t1 > 0 ) PrintAndLog("Time in mfkey32: %.0f ticks - possible keys %d", (float)t1, counter);
|
|
|
|
*outputkey = ( isSuccess ) ? outkey : 0;
|
|
crypto1_destroy(s);
|
|
return isSuccess;
|
|
}
|
|
|
|
bool tryMfk32_moebius(nonces_t data, uint64_t *outputkey, bool verbose) {
|
|
struct Crypto1State *s, *t;
|
|
uint64_t outkey = 0;
|
|
uint64_t key = 0; // recovered key
|
|
uint32_t uid = data.cuid;
|
|
uint32_t nt0 = data.nonce; // first tag challenge (nonce)
|
|
uint32_t nr0_enc = data.nr; // first encrypted reader challenge
|
|
uint32_t ar0_enc = data.ar; // first encrypted reader response
|
|
//uint32_t uid1 = le32toh(data+16);
|
|
uint32_t nt1 = data.nonce2; // second tag challenge (nonce)
|
|
uint32_t nr1_enc = data.nr2; // second encrypted reader challenge
|
|
uint32_t ar1_enc = data.ar2; // second encrypted reader response
|
|
bool isSuccess = FALSE;
|
|
int counter = 0;
|
|
|
|
clock_t t1 = clock();
|
|
|
|
uint32_t p640 = prng_successor(nt0, 64);
|
|
uint32_t p641 = prng_successor(nt1, 64);
|
|
|
|
if (verbose) {
|
|
PrintAndLog("Recovering key for:");
|
|
PrintAndLog(" uid: %08x", uid);
|
|
PrintAndLog(" nt_0: %08x", nt0);
|
|
PrintAndLog(" {nr_0}: %08x", nr0_enc);
|
|
PrintAndLog(" {ar_0}: %08x", ar0_enc);
|
|
PrintAndLog(" nt_1: %08x", nt1);
|
|
PrintAndLog(" {nr_1}: %08x", nr1_enc);
|
|
PrintAndLog(" {ar_1}: %08x", ar1_enc);
|
|
PrintAndLog("\nLFSR succesors of the tag challenge:");
|
|
PrintAndLog(" nt': %08x", p640);
|
|
PrintAndLog(" nt'': %08x", prng_successor(p640, 32));
|
|
}
|
|
|
|
s = lfsr_recovery32(ar0_enc ^ p640, 0);
|
|
|
|
for(t = s; t->odd | t->even; ++t) {
|
|
lfsr_rollback_word(t, 0, 0);
|
|
lfsr_rollback_word(t, nr0_enc, 1);
|
|
lfsr_rollback_word(t, uid ^ nt0, 0);
|
|
crypto1_get_lfsr(t, &key);
|
|
|
|
crypto1_word(t, uid ^ nt1, 0);
|
|
crypto1_word(t, nr1_enc, 1);
|
|
if (ar1_enc == (crypto1_word(t, 0, 0) ^ p641)) {
|
|
outkey=key;
|
|
++counter;
|
|
if (counter==20) break;
|
|
}
|
|
}
|
|
isSuccess = (counter > 0);
|
|
t1 = clock() - t1;
|
|
if ( t1 > 0 ) PrintAndLog("Time in mfkey32_moebius: %.0f ticks - possible keys %d", (float)t1, counter);
|
|
|
|
*outputkey = ( isSuccess ) ? outkey : 0;
|
|
crypto1_destroy(s);
|
|
return isSuccess;
|
|
}
|
|
|
|
int tryMfk64_ex(uint8_t *data, uint64_t *outputkey){
|
|
uint32_t uid = le32toh(data);
|
|
uint32_t nt = le32toh(data+4); // tag challenge
|
|
uint32_t nr_enc = le32toh(data+8); // encrypted reader challenge
|
|
uint32_t ar_enc = le32toh(data+12); // encrypted reader response
|
|
uint32_t at_enc = le32toh(data+16); // encrypted tag response
|
|
return tryMfk64(uid, nt, nr_enc, ar_enc, at_enc, outputkey);
|
|
}
|
|
|
|
int tryMfk64(uint32_t uid, uint32_t nt, uint32_t nr_enc, uint32_t ar_enc, uint32_t at_enc, uint64_t *outputkey){
|
|
uint64_t key = 0; // recovered key
|
|
uint32_t ks2; // keystream used to encrypt reader response
|
|
uint32_t ks3; // keystream used to encrypt tag response
|
|
struct Crypto1State *revstate;
|
|
|
|
PrintAndLog("Enter mfkey64");
|
|
clock_t t1 = clock();
|
|
|
|
// Extract the keystream from the messages
|
|
ks2 = ar_enc ^ prng_successor(nt, 64);
|
|
ks3 = at_enc ^ prng_successor(nt, 96);
|
|
revstate = lfsr_recovery64(ks2, ks3);
|
|
lfsr_rollback_word(revstate, 0, 0);
|
|
lfsr_rollback_word(revstate, 0, 0);
|
|
lfsr_rollback_word(revstate, nr_enc, 1);
|
|
lfsr_rollback_word(revstate, uid ^ nt, 0);
|
|
crypto1_get_lfsr(revstate, &key);
|
|
|
|
PrintAndLog("Found Key: [%012"llx"]", key);
|
|
t1 = clock() - t1;
|
|
if ( t1 > 0 ) PrintAndLog("Time in mfkey64: %.0f ticks", (float)t1);
|
|
|
|
*outputkey = key;
|
|
crypto1_destroy(revstate);
|
|
return 0;
|
|
}
|