X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/14d7657703c3396da37f2c0e56c871d2a13bb17f..696e8630782aa1707c23c2ce4b0e8394689835ac:/client/mifarehost.c?ds=sidebyside
diff --git a/client/mifarehost.c b/client/mifarehost.c
index 92ffbd4e..9be04b4d 100644
--- a/client/mifarehost.c
+++ b/client/mifarehost.c
@@ -16,10 +16,11 @@
#include <pthread.h>
#include "crapto1/crapto1.h"
-#include "proxmark3.h"
+#include "comms.h"
#include "usb_cmd.h"
#include "cmdmain.h"
#include "ui.h"
+#include "parity.h"
#include "util.h"
#include "iso14443crc.h"
@@ -73,13 +74,12 @@ static uint32_t intersection(uint64_t *list1, uint64_t *list2)
// Darkside attack (hf mf mifare)
-static uint32_t nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_info, uint64_t ks_info, uint64_t **keys) {
+static uint32_t nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint32_t ar, uint64_t par_info, uint64_t ks_info, uint64_t **keys) {
struct Crypto1State *states;
- uint32_t i, pos, rr; //nr_diff;
+ uint32_t i, pos;
uint8_t bt, ks3x[8], par[8][8];
uint64_t key_recovered;
- static uint64_t *keylist;
- rr = 0;
+ uint64_t *keylist;
// Reset the last three significant bits of the reader nonce
nr &= 0xffffff1f;
@@ -92,7 +92,7 @@ static uint32_t nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_i
}
}
- states = lfsr_common_prefix(nr, rr, ks3x, par, (par_info == 0));
+ states = lfsr_common_prefix(nr, ar, ks3x, par, (par_info == 0));
if (states == NULL) {
*keys = NULL;
@@ -116,7 +116,7 @@ static uint32_t nonce2key(uint32_t uid, uint32_t nt, uint32_t nr, uint64_t par_i
int mfDarkside(uint64_t *key)
{
uint32_t uid = 0;
- uint32_t nt = 0, nr = 0;
+ uint32_t nt = 0, nr = 0, ar = 0;
uint64_t par_list = 0, ks_list = 0;
uint64_t *keylist = NULL, *last_keylist = NULL;
uint32_t keycount = 0;
@@ -159,18 +159,18 @@ int mfDarkside(uint64_t *key)
nt = (uint32_t)bytes_to_num(resp.d.asBytes + 4, 4);
par_list = bytes_to_num(resp.d.asBytes + 8, 8);
ks_list = bytes_to_num(resp.d.asBytes + 16, 8);
- nr = bytes_to_num(resp.d.asBytes + 24, 4);
+ nr = (uint32_t)bytes_to_num(resp.d.asBytes + 24, 4);
+ ar = (uint32_t)bytes_to_num(resp.d.asBytes + 28, 4);
break;
}
}
if (par_list == 0 && c.arg[0] == true) {
PrintAndLog("Parity is all zero. Most likely this card sends NACK on every failed authentication.");
- PrintAndLog("Attack will take a few seconds longer because we need two consecutive successful runs.");
}
c.arg[0] = false;
- keycount = nonce2key(uid, nt, nr, par_list, ks_list, &keylist);
+ keycount = nonce2key(uid, nt, nr, ar, par_list, ks_list, &keylist);
if (keycount == 0) {
PrintAndLog("Key not found (lfsr_common_prefix list is null). Nt=%08x", nt);
@@ -178,12 +178,14 @@ int mfDarkside(uint64_t *key)
continue;
}
- qsort(keylist, keycount, sizeof(*keylist), compare_uint64);
- keycount = intersection(last_keylist, keylist);
- if (keycount == 0) {
- free(last_keylist);
- last_keylist = keylist;
- continue;
+ if (par_list == 0) {
+ qsort(keylist, keycount, sizeof(*keylist), compare_uint64);
+ keycount = intersection(last_keylist, keylist);
+ if (keycount == 0) {
+ free(last_keylist);
+ last_keylist = keylist;
+ continue;
+ }
}
if (keycount > 1) {
@@ -198,10 +200,10 @@ int mfDarkside(uint64_t *key)
for (int i = 0; i < keycount; i += max_keys) {
int size = keycount - i > max_keys ? max_keys : keycount - i;
for (int j = 0; j < size; j++) {
- if (last_keylist == NULL) {
- num_to_bytes(keylist[i*max_keys + j], 6, keyBlock);
+ if (par_list == 0) {
+ num_to_bytes(last_keylist[i*max_keys + j], 6, keyBlock+(j*6));
} else {
- num_to_bytes(last_keylist[i*max_keys + j], 6, keyBlock);
+ num_to_bytes(keylist[i*max_keys + j], 6, keyBlock+(j*6));
}
}
if (!mfCheckKeys(0, 0, false, size, keyBlock, key)) {
@@ -228,17 +230,46 @@ int mfCheckKeys (uint8_t blockNo, uint8_t keyType, bool clear_trace, uint8_t key
*key = -1;
- UsbCommand c = {CMD_MIFARE_CHKKEYS, {((blockNo & 0xff) | ((keyType&0xff)<<8)), clear_trace, keycnt}};
+ UsbCommand c = {CMD_MIFARE_CHKKEYS, {((blockNo & 0xff) | ((keyType & 0xff) << 8)), clear_trace, keycnt}};
memcpy(c.d.asBytes, keyBlock, 6 * keycnt);
SendCommand(&c);
UsbCommand resp;
- if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1;
+ if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1;
if ((resp.arg[0] & 0xff) != 0x01) return 2;
*key = bytes_to_num(resp.d.asBytes, 6);
return 0;
}
+int mfCheckKeysSec(uint8_t sectorCnt, uint8_t keyType, uint8_t timeout14a, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, sector_t * e_sector){
+
+ uint8_t keyPtr = 0;
+
+ if (e_sector == NULL)
+ return -1;
+
+ UsbCommand c = {CMD_MIFARE_CHKKEYS, {((sectorCnt & 0xff) | ((keyType & 0xff) << 8)), (clear_trace | 0x02)|((timeout14a & 0xff) << 8), keycnt}};
+ memcpy(c.d.asBytes, keyBlock, 6 * keycnt);
+ SendCommand(&c);
+
+ UsbCommand resp;
+ if (!WaitForResponseTimeoutW(CMD_ACK, &resp, MAX(3000, 1000 + 13 * sectorCnt * keycnt * (keyType == 2 ? 2 : 1)), false)) return 1; // timeout: 13 ms / fail auth
+ if ((resp.arg[0] & 0xff) != 0x01) return 2;
+
+ bool foundAKey = false;
+ for(int sec = 0; sec < sectorCnt; sec++){
+ for(int keyAB = 0; keyAB < 2; keyAB++){
+ keyPtr = *(resp.d.asBytes + keyAB * 40 + sec);
+ if (keyPtr){
+ e_sector[sec].foundKey[keyAB] = true;
+ e_sector[sec].Key[keyAB] = bytes_to_num(keyBlock + (keyPtr - 1) * 6, 6);
+ foundAKey = true;
+ }
+ }
+ }
+ return foundAKey ? 0 : 3;
+}
+
// Compare 16 Bits out of cryptostate
int Compare16Bits(const void * a, const void * b) {
if ((*(uint64_t*)b & 0x00ff000000ff0000) == (*(uint64_t*)a & 0x00ff000000ff0000)) return 0;
@@ -266,7 +297,13 @@ typedef
// wrapper function for multi-threaded lfsr_recovery32
-void* nested_worker_thread(void *arg)
+void
+#ifdef __has_attribute
+#if __has_attribute(force_align_arg_pointer)
+__attribute__((force_align_arg_pointer))
+#endif
+#endif
+*nested_worker_thread(void *arg)
{
struct Crypto1State *p1;
StateList_t *statelist = arg;
@@ -280,6 +317,7 @@ void* nested_worker_thread(void *arg)
return statelist->head.slhead;
}
+
int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t *key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t *resultKey, bool calibrate)
{
uint16_t i;
@@ -290,7 +328,7 @@ int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t *key, uint8_t trgBlockNo,
struct Crypto1State *p1, *p2, *p3, *p4;
// flush queue
- WaitForResponseTimeout(CMD_ACK, NULL, 100);
+ (void)WaitForResponseTimeout(CMD_ACK,NULL,100);
UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};
memcpy(c.d.asBytes, key, 6);
@@ -396,7 +434,8 @@ int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t *key, uint8_t trgBlockNo,
int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {
UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};
SendCommand(&c);
- UsbCommand resp;
+
+ UsbCommand resp;
if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1;
memcpy(data, resp.d.asBytes, blocksCount * 16);
return 0;
@@ -416,6 +455,7 @@ int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {
UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, 0, blockNo}};
SendCommand(&c);
+
UsbCommand resp;
if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
isOK = resp.arg[0] & 0xff;
@@ -434,8 +474,9 @@ int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uin
UsbCommand c = {CMD_MIFARE_CSETBLOCK, {wantWipe, params & (0xFE | (uid == NULL ? 0:1)), blockNo}};
memcpy(c.d.asBytes, data, 16);
SendCommand(&c);
+
UsbCommand resp;
- if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
+ if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {
isOK = resp.arg[0] & 0xff;
if (uid != NULL)
memcpy(uid, resp.d.asBytes, 4);
@@ -445,25 +486,40 @@ int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uin
PrintAndLog("Command execute timeout");
return 1;
}
+
return 0;
}
-int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, bool wantWipe) {
+int mfCWipe(uint32_t numSectors, bool gen1b, bool wantWipe, bool wantFill) {
+ uint8_t isOK = 0;
+ uint8_t cmdParams = wantWipe + wantFill * 0x02 + gen1b * 0x04;
+ UsbCommand c = {CMD_MIFARE_CWIPE, {numSectors, cmdParams, 0}};
+ SendCommand(&c);
+
+ UsbCommand resp;
+ WaitForResponse(CMD_ACK,&resp);
+ isOK = resp.arg[0] & 0xff;
+
+ return isOK;
+}
+
+int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID) {
uint8_t oldblock0[16] = {0x00};
uint8_t block0[16] = {0x00};
- int old, gen = 0;
+ int gen = 0, res;
gen = mfCIdentify();
+ /* generation 1a magic card by default */
+ uint8_t cmdParams = CSETBLOCK_SINGLE_OPER;
if (gen == 2) {
/* generation 1b magic card */
- old = mfCGetBlock(0, oldblock0, CSETBLOCK_SINGLE_OPER | CSETBLOCK_MAGIC_1B);
- } else {
- /* generation 1a magic card by default */
- old = mfCGetBlock(0, oldblock0, CSETBLOCK_SINGLE_OPER);
+ cmdParams = CSETBLOCK_SINGLE_OPER | CSETBLOCK_MAGIC_1B;
}
+
+ res = mfCGetBlock(0, oldblock0, cmdParams);
- if (old == 0) {
+ if (res == 0) {
memcpy(block0, oldblock0, 16);
PrintAndLog("old block 0: %s", sprint_hex(block0,16));
} else {
@@ -474,25 +530,42 @@ int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, bool w
// UID
memcpy(block0, uid, 4);
// Mifare UID BCC
- block0[4] = block0[0]^block0[1]^block0[2]^block0[3];
+ block0[4] = block0[0] ^ block0[1] ^ block0[2] ^ block0[3];
// mifare classic SAK(byte 5) and ATQA(byte 6 and 7, reversed)
- if (sak!=NULL)
- block0[5]=sak[0];
- if (atqa!=NULL) {
- block0[6]=atqa[1];
- block0[7]=atqa[0];
+ if (sak != NULL)
+ block0[5] = sak[0];
+ if (atqa != NULL) {
+ block0[6] = atqa[1];
+ block0[7] = atqa[0];
}
- PrintAndLog("new block 0: %s", sprint_hex(block0,16));
+ PrintAndLog("new block 0: %s", sprint_hex(block0, 16));
- if (gen == 2) {
- /* generation 1b magic card */
- return mfCSetBlock(0, block0, oldUID, wantWipe, CSETBLOCK_SINGLE_OPER | CSETBLOCK_MAGIC_1B);
- } else {
- /* generation 1a magic card by default */
- return mfCSetBlock(0, block0, oldUID, wantWipe, CSETBLOCK_SINGLE_OPER);
+ res = mfCSetBlock(0, block0, oldUID, false, cmdParams);
+ if (res) {
+ PrintAndLog("Can't set block 0. Error: %d", res);
+ return res;
}
+
+ return 0;
}
+int mfCIdentify() {
+ UsbCommand c = {CMD_MIFARE_CIDENT, {0, 0, 0}};
+ SendCommand(&c);
+ UsbCommand resp;
+ WaitForResponse(CMD_ACK,&resp);
+
+ uint8_t isGeneration = resp.arg[0] & 0xff;
+ switch( isGeneration ){
+ case 1: PrintAndLog("Chinese magic backdoor commands (GEN 1a) detected"); break;
+ case 2: PrintAndLog("Chinese magic backdoor command (GEN 1b) detected"); break;
+ default: PrintAndLog("No chinese magic backdoor command detected"); break;
+ }
+
+ return (int) isGeneration;
+}
+
+
// SNIFFER
// constants
@@ -510,14 +583,19 @@ struct Crypto1State *traceCrypto1 = NULL;
struct Crypto1State *revstate;
uint64_t lfsr;
+uint64_t ui64Key;
uint32_t ks2;
uint32_t ks3;
-uint32_t uid; // serial number
-uint32_t nt; // tag challenge
-uint32_t nr_enc; // encrypted reader challenge
-uint32_t ar_enc; // encrypted reader response
-uint32_t at_enc; // encrypted tag response
+uint32_t uid; // serial number
+uint32_t nt; // tag challenge
+uint32_t nt_enc; // encrypted tag challenge
+uint8_t nt_enc_par; // encrypted tag challenge parity
+uint32_t nr_enc; // encrypted reader challenge
+uint32_t ar_enc; // encrypted reader response
+uint8_t ar_enc_par; // encrypted reader response parity
+uint32_t at_enc; // encrypted tag response
+uint8_t at_enc_par; // encrypted tag response parity
int isTraceCardEmpty(void) {
return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));
@@ -531,7 +609,7 @@ int isBlockEmpty(int blockN) {
}
int isBlockTrailer(int blockN) {
- return ((blockN & 0x03) == 0x03);
+ return ((blockN & 0x03) == 0x03);
}
int saveTraceCard(void) {
@@ -545,7 +623,8 @@ int saveTraceCard(void) {
for (int i = 0; i < 64; i++) { // blocks
for (int j = 0; j < 16; j++) // bytes
fprintf(f, "%02x", *(traceCard + i * 16 + j));
- fprintf(f,"\n");
+ if (i < 63)
+ fprintf(f,"\n");
}
fclose(f);
return 0;
@@ -593,6 +672,7 @@ int loadTraceCard(uint8_t *tuid) {
blockNum++;
}
fclose(f);
+
return 0;
}
@@ -613,6 +693,7 @@ int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFil
uid = bytes_to_num(tuid + 3, 4);
traceState = TRACE_IDLE;
+
return 0;
}
@@ -633,8 +714,36 @@ void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool i
return;
}
+bool NTParityCheck(uint32_t ntx) {
+ if (
+ (oddparity8(ntx >> 8 & 0xff) ^ (ntx & 0x01) ^ ((nt_enc_par >> 5) & 0x01) ^ (nt_enc & 0x01)) ||
+ (oddparity8(ntx >> 16 & 0xff) ^ (ntx >> 8 & 0x01) ^ ((nt_enc_par >> 6) & 0x01) ^ (nt_enc >> 8 & 0x01)) ||
+ (oddparity8(ntx >> 24 & 0xff) ^ (ntx >> 16 & 0x01) ^ ((nt_enc_par >> 7) & 0x01) ^ (nt_enc >> 16 & 0x01))
+ )
+ return false;
+
+ uint32_t ar = prng_successor(ntx, 64);
+ if (
+ (oddparity8(ar >> 8 & 0xff) ^ (ar & 0x01) ^ ((ar_enc_par >> 5) & 0x01) ^ (ar_enc & 0x01)) ||
+ (oddparity8(ar >> 16 & 0xff) ^ (ar >> 8 & 0x01) ^ ((ar_enc_par >> 6) & 0x01) ^ (ar_enc >> 8 & 0x01)) ||
+ (oddparity8(ar >> 24 & 0xff) ^ (ar >> 16 & 0x01) ^ ((ar_enc_par >> 7) & 0x01) ^ (ar_enc >> 16 & 0x01))
+ )
+ return false;
+
+ uint32_t at = prng_successor(ntx, 96);
+ if (
+ (oddparity8(ar & 0xff) ^ (at >> 24 & 0x01) ^ ((ar_enc_par >> 4) & 0x01) ^ (at_enc >> 24 & 0x01)) ||
+ (oddparity8(at >> 8 & 0xff) ^ (at & 0x01) ^ ((at_enc_par >> 5) & 0x01) ^ (at_enc & 0x01)) ||
+ (oddparity8(at >> 16 & 0xff) ^ (at >> 8 & 0x01) ^ ((at_enc_par >> 6) & 0x01) ^ (at_enc >> 8 & 0x01)) ||
+ (oddparity8(at >> 24 & 0xff) ^ (at >> 16 & 0x01) ^ ((at_enc_par >> 7) & 0x01) ^ (at_enc >> 16 & 0x01))
+ )
+ return false;
+
+ return true;
+}
+
-int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {
+int mfTraceDecode(uint8_t *data_src, int len, uint8_t parity, bool wantSaveToEmlFile) {
uint8_t data[64];
if (traceState == TRACE_ERROR) return 1;
@@ -646,7 +755,9 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {
memcpy(data, data_src, len);
if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {
mf_crypto1_decrypt(traceCrypto1, data, len, 0);
- PrintAndLog("dec> %s", sprint_hex(data, len));
+ uint8_t parity[16];
+ oddparitybuf(data, len, parity);
+ PrintAndLog("dec> %s [%s]", sprint_hex(data, len), printBitsPar(parity, len));
AddLogHex(logHexFileName, "dec> ", data, len);
}
@@ -735,7 +846,12 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {
case TRACE_AUTH1:
if (len == 4) {
traceState = TRACE_AUTH2;
- nt = bytes_to_num(data, 4);
+ if (!traceCrypto1) {
+ nt = bytes_to_num(data, 4);
+ } else {
+ nt_enc = bytes_to_num(data, 4);
+ nt_enc_par = parity;
+ }
return 0;
} else {
traceState = TRACE_ERROR;
@@ -749,6 +865,7 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {
nr_enc = bytes_to_num(data, 4);
ar_enc = bytes_to_num(data + 4, 4);
+ ar_enc_par = parity << 4;
return 0;
} else {
traceState = TRACE_ERROR;
@@ -761,19 +878,90 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {
traceState = TRACE_IDLE;
at_enc = bytes_to_num(data, 4);
-
- // decode key here)
- 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, &lfsr);
- printf("key> %x%x\n", (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF));
- AddLogUint64(logHexFileName, "key> ", lfsr);
+ at_enc_par = parity;
+ if (!traceCrypto1) {
+
+ // decode key here)
+ 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, &lfsr);
+ crypto1_destroy(revstate);
+ ui64Key = lfsr;
+ printf("key> probable key:%x%x Prng:%s ks2:%08x ks3:%08x\n",
+ (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF),
+ validate_prng_nonce(nt) ? "WEAK": "HARDEND",
+ ks2,
+ ks3);
+ AddLogUint64(logHexFileName, "key> ", lfsr);
+ } else {
+ if (validate_prng_nonce(nt)) {
+ struct Crypto1State *pcs;
+ pcs = crypto1_create(ui64Key);
+ uint32_t nt1 = crypto1_word(pcs, nt_enc ^ uid, 1) ^ nt_enc;
+ uint32_t ar = prng_successor(nt1, 64);
+ uint32_t at = prng_successor(nt1, 96);
+ printf("key> nested auth uid: %08x nt: %08x nt_parity: %s ar: %08x at: %08x\n", uid, nt1, printBitsPar(&nt_enc_par, 4), ar, at);
+ uint32_t nr1 = crypto1_word(pcs, nr_enc, 1) ^ nr_enc;
+ uint32_t ar1 = crypto1_word(pcs, 0, 0) ^ ar_enc;
+ uint32_t at1 = crypto1_word(pcs, 0, 0) ^ at_enc;
+ crypto1_destroy(pcs);
+ printf("key> the same key test. nr1: %08x ar1: %08x at1: %08x \n", nr1, ar1, at1);
+
+ if (NTParityCheck(nt1))
+ printf("key> the same key test OK. key=%x%x\n", (unsigned int)((ui64Key & 0xFFFFFFFF00000000) >> 32), (unsigned int)(ui64Key & 0xFFFFFFFF));
+ else
+ printf("key> the same key test. check nt parity error.\n");
+
+ uint32_t ntc = prng_successor(nt, 90);
+ uint32_t ntx = 0;
+ int ntcnt = 0;
+ for (int i = 0; i < 16383; i++) {
+ ntc = prng_successor(ntc, 1);
+ if (NTParityCheck(ntc)){
+ if (!ntcnt)
+ ntx = ntc;
+ ntcnt++;
+ }
+ }
+ if (ntcnt)
+ printf("key> nt candidate=%08x nonce distance=%d candidates count=%d\n", ntx, nonce_distance(nt, ntx), ntcnt);
+ else
+ printf("key> don't have any nt candidate( \n");
+
+ nt = ntx;
+ ks2 = ar_enc ^ prng_successor(ntx, 64);
+ ks3 = at_enc ^ prng_successor(ntx, 96);
+
+ // decode key
+ 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, &lfsr);
+ crypto1_destroy(revstate);
+ ui64Key = lfsr;
+ printf("key> probable key:%x%x ks2:%08x ks3:%08x\n",
+ (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF),
+ ks2,
+ ks3);
+ AddLogUint64(logHexFileName, "key> ", lfsr);
+ } else {
+ printf("key> hardnested not implemented!\n");
+
+ crypto1_destroy(traceCrypto1);
+
+ // not implemented
+ traceState = TRACE_ERROR;
+ }
+ }
int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;
if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);
@@ -791,15 +979,6 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {
// set cryptosystem state
traceCrypto1 = lfsr_recovery64(ks2, ks3);
-
-// nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;
-
- /* traceCrypto1 = crypto1_create(lfsr); // key in lfsr
- crypto1_word(traceCrypto1, nt ^ uid, 0);
- crypto1_word(traceCrypto1, ar, 1);
- crypto1_word(traceCrypto1, 0, 0);
- crypto1_word(traceCrypto1, 0, 0);*/
-
return 0;
} else {
traceState = TRACE_ERROR;
@@ -815,6 +994,8 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {
return 0;
}
+// DECODING
+
int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, int len){
/*
uint32_t nt; // tag challenge
@@ -835,48 +1016,72 @@ int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data,
return 0;
}
-int mfCIdentify()
-{
- UsbCommand c = {CMD_READER_ISO_14443a, {ISO14A_CONNECT | ISO14A_NO_DISCONNECT, 0, 0}};
- SendCommand(&c);
- UsbCommand resp;
- WaitForResponse(CMD_ACK,&resp);
-
- iso14a_card_select_t card;
- memcpy(&card, (iso14a_card_select_t *)resp.d.asBytes, sizeof(iso14a_card_select_t));
-
- uint64_t select_status = resp.arg[0]; // 0: couldn't read, 1: OK, with ATS, 2: OK, no ATS, 3: proprietary Anticollision
+/** validate_prng_nonce
+ * Determine if nonce is deterministic. ie: Suspectable to Darkside attack.
+ * returns
+ * true = weak prng
+ * false = hardend prng
+ */
+bool validate_prng_nonce(uint32_t nonce) {
+ uint16_t *dist = 0;
+ uint16_t x, i;
+
+ dist = malloc(2 << 16);
+ if(!dist)
+ return -1;
- if(select_status != 0) {
- uint8_t rats[] = { 0xE0, 0x80 }; // FSDI=8 (FSD=256), CID=0
- c.arg[0] = ISO14A_RAW | ISO14A_APPEND_CRC | ISO14A_NO_DISCONNECT;
- c.arg[1] = 2;
- c.arg[2] = 0;
- memcpy(c.d.asBytes, rats, 2);
- SendCommand(&c);
- WaitForResponse(CMD_ACK,&resp);
+ // init prng table:
+ for (x = i = 1; i; ++i) {
+ dist[(x & 0xff) << 8 | x >> 8] = i;
+ x = x >> 1 | (x ^ x >> 2 ^ x >> 3 ^ x >> 5) << 15;
}
+
+ uint32_t res = (65535 - dist[nonce >> 16] + dist[nonce & 0xffff]) % 65535;
+
+ free(dist);
+ return (res == 16);
+}
- c.cmd = CMD_MIFARE_CIDENT;
- c.arg[0] = 0;
- c.arg[1] = 0;
- c.arg[2] = 0;
+/* Detect Tag Prng,
+* function performs a partial AUTH, where it tries to authenticate against block0, key A, but only collects tag nonce.
+* the tag nonce is check to see if it has a predictable PRNG.
+* @returns
+* TRUE if tag uses WEAK prng (ie Now the NACK bug also needs to be present for Darkside attack)
+* FALSE is tag uses HARDEND prng (ie hardnested attack possible, with known key)
+*/
+int DetectClassicPrng(void){
+
+ UsbCommand resp, respA;
+ uint8_t cmd[] = {0x60, 0x00}; // MIFARE_AUTH_KEYA
+ uint32_t flags = ISO14A_CONNECT | ISO14A_RAW | ISO14A_APPEND_CRC | ISO14A_NO_RATS;
+
+ UsbCommand c = {CMD_READER_ISO_14443a, {flags, sizeof(cmd), 0}};
+ memcpy(c.d.asBytes, cmd, sizeof(cmd));
+
+ clearCommandBuffer();
SendCommand(&c);
- WaitForResponse(CMD_ACK,&resp);
-
- uint8_t isGeneration = resp.arg[0] & 0xff;
- switch( isGeneration ){
- case 1: PrintAndLog("Chinese magic backdoor commands (GEN 1a) detected"); break;
- case 2: PrintAndLog("Chinese magic backdoor command (GEN 1b) detected"); break;
- default: PrintAndLog("No chinese magic backdoor command detected"); break;
+ if (!WaitForResponseTimeout(CMD_ACK, &resp, 2000)) {
+ PrintAndLog("PRNG UID: Reply timeout.");
+ return -1;
+ }
+
+ // if select tag failed.
+ if (resp.arg[0] == 0) {
+ PrintAndLog("PRNG error: selecting tag failed, can't detect prng.");
+ return -1;
+ }
+
+ if (!WaitForResponseTimeout(CMD_ACK, &respA, 5000)) {
+ PrintAndLog("PRNG data: Reply timeout.");
+ return -1;
}
- // disconnect
- c.cmd = CMD_READER_ISO_14443a;
- c.arg[0] = 0;
- c.arg[1] = 0;
- c.arg[2] = 0;
- SendCommand(&c);
+ // check respA
+ if (respA.arg[0] != 4) {
+ PrintAndLog("PRNG data error: Wrong length: %d", respA.arg[0]);
+ return -1;
+ }
- return (int) isGeneration;
+ uint32_t nonce = bytes_to_num(respA.d.asBytes, respA.arg[0]);
+ return validate_prng_nonce(nonce);
}