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fix: crapto3.3 sometimes crashing with hf mf mifare on Fudan clones (no par, all NACK) (#233)
added readme.txt again in tools/nonce2key
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@ -76,7 +76,7 @@ int nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_
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if (par_info == 0)
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PrintAndLog("Parity is all zero, trying special attack! Just wait for few more seconds...");
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state = lfsr_common_prefix(nr, rr, ks3x, par);
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state = lfsr_common_prefix(nr, rr, ks3x, par, (par_info == 0));
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state_s = (int64_t*)state;
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//char filename[50] ;
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@ -465,18 +465,9 @@ uint32_t *lfsr_prefix_ks(uint8_t ks[8], int isodd)
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*/
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static struct Crypto1State*
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check_pfx_parity(uint32_t prefix, uint32_t rresp, uint8_t parities[8][8],
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uint32_t odd, uint32_t even, struct Crypto1State* sl)
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uint32_t odd, uint32_t even, struct Crypto1State* sl, uint32_t no_par)
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{
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uint32_t ks1, nr, ks2, rr, ks3, c, good = 1, no_par = 1;
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for (int i = 0; i < 8; i++) {
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for (int j = 0; j < 8; j++) {
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if (parities[i][j] != 0) {
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no_par = 0;
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break;
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}
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}
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}
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uint32_t ks1, nr, ks2, rr, ks3, c, good = 1;
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for(c = 0; good && c < 8; ++c) {
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sl->odd = odd ^ fastfwd[1][c];
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@ -510,7 +501,7 @@ check_pfx_parity(uint32_t prefix, uint32_t rresp, uint8_t parities[8][8],
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* Implentation of the common prefix attack.
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*/
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struct Crypto1State*
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lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8])
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lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8], uint32_t no_par)
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{
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struct Crypto1State *statelist, *s;
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uint32_t *odd, *even, *o, *e, top;
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@ -518,7 +509,7 @@ lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8])
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odd = lfsr_prefix_ks(ks, 1);
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even = lfsr_prefix_ks(ks, 0);
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s = statelist = malloc((sizeof *statelist) << 20);
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s = statelist = malloc((sizeof *statelist) << 21); // need more for no_par special attack. Enough???
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if(!s || !odd || !even) {
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free(statelist);
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statelist = 0;
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@ -530,7 +521,7 @@ lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8])
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for(top = 0; top < 64; ++top) {
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*o += 1 << 21;
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*e += (!(top & 7) + 1) << 21;
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s = check_pfx_parity(pfx, rr, par, *o, *e, s);
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s = check_pfx_parity(pfx, rr, par, *o, *e, s, no_par);
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}
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s->odd = s->even = 0;
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@ -41,7 +41,7 @@ struct Crypto1State* lfsr_recovery32(uint32_t ks2, uint32_t in);
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struct Crypto1State* lfsr_recovery64(uint32_t ks2, uint32_t ks3);
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uint32_t *lfsr_prefix_ks(uint8_t ks[8], int isodd);
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struct Crypto1State*
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lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8]);
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lfsr_common_prefix(uint32_t pfx, uint32_t rr, uint8_t ks[8], uint8_t par[8][8], uint32_t no_par);
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uint8_t lfsr_rollback_bit(struct Crypto1State* s, uint32_t in, int fb);
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@ -14,7 +14,7 @@ all: $(OBJS) $(EXES)
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%.o : %.c
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$(CC) $(CFLAGS) -c -o $@ $<
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% : %.c
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% : %.c $(OBJS)
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$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(OBJS) $<
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clean:
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@ -47,7 +47,7 @@ int main(const int argc, const char* argv[]) {
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printf("%01x|\n",par[i][7]);
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}
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state = lfsr_common_prefix(nr,rr,ks3x,par);
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state = lfsr_common_prefix(nr,rr,ks3x,par,0);
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lfsr_rollback_word(state,uid^nt,0);
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crypto1_get_lfsr(state,&key_recovered);
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printf("\nkey recovered: %012" PRIx64 "\n\n",key_recovered);
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7
tools/nonce2key/readme.txt
Normal file
7
tools/nonce2key/readme.txt
Normal file
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@ -0,0 +1,7 @@
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To test the nonce2key tool.
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:: tip
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You can use the output from "hf mf mifare" to use with this tool.
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:: sample
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./nonce2key e9cadd9c a8bf4a12 a020a8285858b090 050f010607060e07
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