X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/fe087813f65b2a08ee814ad78d1164ae7eac6db0..1338d245c2ff5930a059d3d1fdea93a535fe6e61:/client/mifarehost.c diff --git a/client/mifarehost.c b/client/mifarehost.c index 3b524758..9be04b4d 100644 --- a/client/mifarehost.c +++ b/client/mifarehost.c @@ -16,10 +16,11 @@ #include #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); @@ -418,7 +456,7 @@ int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) { UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, 0, blockNo}}; SendCommand(&c); - UsbCommand resp; + UsbCommand resp; if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) { isOK = resp.arg[0] & 0xff; memcpy(data, resp.d.asBytes, 16); @@ -437,8 +475,8 @@ int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uin memcpy(c.d.asBytes, data, 16); SendCommand(&c); - UsbCommand resp; - if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) { + UsbCommand resp; + if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) { isOK = resp.arg[0] & 0xff; if (uid != NULL) memcpy(uid, resp.d.asBytes, 4); @@ -448,25 +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 { @@ -477,25 +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 @@ -513,14 +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)); @@ -548,7 +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; @@ -638,8 +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; @@ -651,7 +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); } @@ -740,7 +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; @@ -754,6 +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; @@ -766,19 +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); @@ -796,15 +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; @@ -820,6 +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 @@ -840,49 +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); }