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hf mf isen: add nt indexes

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This commit is contained in:
Philippe Teuwen 2024-07-31 00:41:50 +02:00
commit fb0b448c4f
4 changed files with 22 additions and 12 deletions
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28
armsrc/mifareutil.c
View file

@ -183,20 +183,22 @@ int mifare_classic_authex_cmd(struct Crypto1State *pcs, uint32_t uid, uint8_t bl
uint32_t nr32 = nr[0] << 24 | nr[1] << 16 | nr[2] << 8 | nr[3];
if (g_dbglevel >= DBG_EXTENDED) {
if (!isNested) {
Dbprintf("auth cmd: %02x %02x | uid: %08x | nr: %08x %s| nt: %08x %s| par: %i%i%i%i %s",
Dbprintf("auth cmd: %02x %02x | uid: %08x | nr: %08x %s| nt: %08x %s %5i| par: %i%i%i%i %s",
cmd, blockNo, uid,
nr32, validate_prng_nonce(nr32) ? "@" : " ",
nt, validate_prng_nonce(nt) ? "@" : " ",
nt, validate_prng_nonce(nt) ? "@idx" : " idx",
validate_prng_nonce(nt) ? nonce16_index(nt >> 16) : -1,
(receivedAnswerPar[0] >> 7) & 1,
(receivedAnswerPar[0] >> 6) & 1,
(receivedAnswerPar[0] >> 5) & 1,
(receivedAnswerPar[0] >> 4) & 1,
validate_parity_nonce(nt, receivedAnswerPar[0], nt) ? "ok " : "bad");
} else {
Dbprintf("auth nested cmd: %02x %02x | uid: %08x | nr: %08x %s| nt: %08x %s| par: %i%i%i%i %s| ntenc: %08x %s| parerr: %i%i%i%i",
Dbprintf("auth nested cmd: %02x %02x | uid: %08x | nr: %08x %s| nt: %08x %s %5i| par: %i%i%i%i %s| ntenc: %08x %s| parerr: %i%i%i%i",
cmd, blockNo, uid,
nr32, validate_prng_nonce(nr32) ? "@" : " ",
nt, validate_prng_nonce(nt) ? "@" : " ",
nt, validate_prng_nonce(nt) ? "@idx" : " idx",
validate_prng_nonce(nt) ? nonce16_index(nt >> 16) : -1,
(receivedAnswerPar[0] >> 7) & 1,
(receivedAnswerPar[0] >> 6) & 1,
(receivedAnswerPar[0] >> 5) & 1,
@ -947,13 +949,9 @@ bool validate_parity_nonce(uint32_t ntenc, uint8_t ntparenc, uint32_t nt) {
(((ntpar >> 1) & 1) == oddparity8((nt>>8) & 0xFF));
}
int nonce_distance(uint32_t from, uint32_t to) {
if (!validate_prng_nonce(from) || !validate_prng_nonce(to))
return -1;
if (from == to)
int nonce16_distance(uint16_t x, uint16_t y) {
if (x == y)
return 0;
uint16_t x = from;
uint16_t y = to;
x = (x & 0xff) << 8 | x >> 8;
y = (y & 0xff) << 8 | y >> 8;
uint16_t i = 1;
@ -965,3 +963,13 @@ int nonce_distance(uint32_t from, uint32_t to) {
// never reached
return -1;
}
int nonce_distance(uint32_t from, uint32_t to) {
if (!validate_prng_nonce(from) || !validate_prng_nonce(to))
return -1;
return nonce16_distance(from >> 16, to >> 16);
}
int nonce16_index(uint16_t nt) {
return nonce16_distance(0x0100, nt) + 1;
}

2
armsrc/mifareutil.h
View file

@ -125,4 +125,6 @@ bool emlCheckValBl(int blockNum);
bool validate_prng_nonce(uint32_t nonce);
bool validate_parity_nonce(uint32_t ntenc, uint8_t ntparenc, uint32_t nt);
int nonce_distance(uint32_t from, uint32_t to);
int nonce16_distance(uint16_t x, uint16_t y);
int nonce16_index(uint16_t nt);
#endif

2
client/src/cmdhflist.c
View file

@ -2068,7 +2068,7 @@ void annotateMifare(char *exp, size_t size, uint8_t *cmd, uint8_t cmdsize,
AuthData.nt = bytes_to_num(cmd, 4);
AuthData.nt_enc_par = 0;
if (validate_prng_nonce(AuthData.nt)) {
snprintf(exp, size, "AUTH: nt (lfsr16 index %i)", nonce_distance(0x0100, AuthData.nt));
snprintf(exp, size, "AUTH: nt (lfsr16 index %i)", nonce_distance(0, AuthData.nt));
} else {
snprintf(exp, size, "AUTH: nt");
}

2
client/src/mifare/mifarehost.c
View file

@ -1450,7 +1450,7 @@ int detect_classic_static_encrypted_nonce_ex(uint8_t block_no, uint8_t key_type,
(ntencpar >> 3) & 1, (ntencpar >> 2) & 1, (ntencpar >> 1) & 1,
ks, nt,
oddparity8((nt>>24) & 0xFF), oddparity8((nt>>16) & 0xFF), oddparity8((nt>>8) & 0xFF), oddparity8(nt & 0xFF),
nonce_distance(0x0100, nt));
nonce_distance(0, nt));
} else {
PrintAndLogEx(INFO, "nTenc " _GREEN_("%08x") " par {" _YELLOW_("%i%i%i%i") "}=" _YELLOW_("%i%i%ix") " | ks " _YELLOW_("%08x") " | nT " _YELLOW_("%08x") " par " _YELLOW_("%i%i%i%i") " | " _RED_("not lfsr16") " (wrong key)",
ntenc,