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