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uniformize tools/mfc/card_reader

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This commit is contained in:
Philippe Teuwen 2024-09-02 11:11:40 +02:00
commit 5b6a898fe7
7 changed files with 60 additions and 54 deletions
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28
tools/mfc/card_reader/mfkey32.c
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@ -15,13 +15,14 @@ int main(int argc, char *argv[]) {
uint32_t ar0_enc; // first encrypted reader response
uint32_t nr1_enc; // second encrypted reader challenge
uint32_t ar1_enc; // second encrypted reader response
uint32_t ks2; // keystream used to encrypt reader response
uint32_t ks2_0; // first keystream used to encrypt reader response
uint32_t ks2_1; // second keystream used to encrypt reader response
printf("MIFARE Classic key recovery - based on 32 bits of keystream\n");
printf("Recover key from two 32-bit reader authentication answers only!\n\n");
if (argc < 7) {
printf(" syntax: %s <uid> <nt> <nr_0> <ar_0> <nr_1> <ar_1>\n\n", argv[0]);
printf(" syntax: %s <uid> <nt> <{nr_0}> <{ar}_0> <{nr_1}> <{ar}_0>\n\n", argv[0]);
return 1;
}
@ -36,22 +37,23 @@ int main(int argc, char *argv[]) {
printf(" uid: %08x\n", uid);
printf(" nt: %08x\n", nt);
printf(" {nr_0}: %08x\n", nr0_enc);
printf(" {ar_0}: %08x\n", ar0_enc);
printf(" {ar}_0: %08x\n", ar0_enc);
printf(" {nr_1}: %08x\n", nr1_enc);
printf(" {ar_1}: %08x\n", ar1_enc);
printf(" {ar}_1: %08x\n", ar1_enc);
// Generate lfsr successors of the tag challenge
printf("\nLFSR successors of the tag challenge:\n");
uint32_t p64 = prng_successor(nt, 64);
printf(" nt': %08x\n", p64);
printf(" nt'': %08x\n", prng_successor(p64, 32));
printf("\nLFSR successor of the tag challenge:\n");
uint32_t ar = prng_successor(nt, 64);
printf(" ar: %08x\n", ar);
// Extract the keystream from the messages
printf("\nKeystream used to generate {ar} and {at}:\n");
ks2 = ar0_enc ^ p64;
printf(" ks2: %08x\n", ks2);
printf("\nKeystreams used to generate {ar}_0 and {ar}_1:\n");
ks2_0 = ar0_enc ^ ar;
printf(" ks2_0: %08x\n", ks2_0);
ks2_1 = ar1_enc ^ ar;
printf(" ks2_1: %08x\n", ks2_1);
s = lfsr_recovery32(ar0_enc ^ p64, 0);
s = lfsr_recovery32(ks2_0, 0);
for (t = s; t->odd | t->even; ++t) {
lfsr_rollback_word(t, 0, 0);
@ -60,7 +62,7 @@ int main(int argc, char *argv[]) {
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)) {
if (ks2_1 == crypto1_word(t, 0, 0)) {
printf("\nFound Key: [%012" PRIx64 "]\n\n", key);
break;
}