X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/3d057cfb918fb7e296cd27d6ced98008ea967753..fdd9395d1a0f331f9cc74d6cdd6dd71447524e6c:/client/mifarehost.c diff --git a/client/mifarehost.c b/client/mifarehost.c deleted file mode 100644 index 9be04b4d..00000000 --- a/client/mifarehost.c +++ /dev/null @@ -1,1087 +0,0 @@ -// Merlok, 2011, 2012 -// people from mifare@nethemba.com, 2010 -// -// This code is licensed to you under the terms of the GNU GPL, version 2 or, -// at your option, any later version. See the LICENSE.txt file for the text of -// the license. -//----------------------------------------------------------------------------- -// mifare commands -//----------------------------------------------------------------------------- - -#include "mifarehost.h" - -#include -#include -#include -#include - -#include "crapto1/crapto1.h" -#include "comms.h" -#include "usb_cmd.h" -#include "cmdmain.h" -#include "ui.h" -#include "parity.h" -#include "util.h" -#include "iso14443crc.h" - -#include "mifare.h" - -// mifare tracer flags used in mfTraceDecode() -#define TRACE_IDLE 0x00 -#define TRACE_AUTH1 0x01 -#define TRACE_AUTH2 0x02 -#define TRACE_AUTH_OK 0x03 -#define TRACE_READ_DATA 0x04 -#define TRACE_WRITE_OK 0x05 -#define TRACE_WRITE_DATA 0x06 -#define TRACE_ERROR 0xFF - - -static int compare_uint64(const void *a, const void *b) { - // didn't work: (the result is truncated to 32 bits) - //return (*(int64_t*)b - *(int64_t*)a); - - // better: - if (*(uint64_t*)b == *(uint64_t*)a) return 0; - else if (*(uint64_t*)b < *(uint64_t*)a) return 1; - else return -1; -} - - -// create the intersection (common members) of two sorted lists. Lists are terminated by -1. Result will be in list1. Number of elements is returned. -static uint32_t intersection(uint64_t *list1, uint64_t *list2) -{ - if (list1 == NULL || list2 == NULL) { - return 0; - } - uint64_t *p1, *p2, *p3; - p1 = p3 = list1; - p2 = list2; - - while ( *p1 != -1 && *p2 != -1 ) { - if (compare_uint64(p1, p2) == 0) { - *p3++ = *p1++; - p2++; - } - else { - while (compare_uint64(p1, p2) < 0) ++p1; - while (compare_uint64(p1, p2) > 0) ++p2; - } - } - *p3 = -1; - return p3 - list1; -} - - -// Darkside attack (hf mf mifare) -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; - uint8_t bt, ks3x[8], par[8][8]; - uint64_t key_recovered; - uint64_t *keylist; - - // Reset the last three significant bits of the reader nonce - nr &= 0xffffff1f; - - for (pos=0; pos<8; pos++) { - ks3x[7-pos] = (ks_info >> (pos*8)) & 0x0f; - bt = (par_info >> (pos*8)) & 0xff; - for (i=0; i<8; i++) { - par[7-pos][i] = (bt >> i) & 0x01; - } - } - - states = lfsr_common_prefix(nr, ar, ks3x, par, (par_info == 0)); - - if (states == NULL) { - *keys = NULL; - return 0; - } - - keylist = (uint64_t*)states; - - for (i = 0; keylist[i]; i++) { - lfsr_rollback_word(states+i, uid^nt, 0); - crypto1_get_lfsr(states+i, &key_recovered); - keylist[i] = key_recovered; - } - keylist[i] = -1; - - *keys = keylist; - return i; -} - - -int mfDarkside(uint64_t *key) -{ - uint32_t uid = 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; - int16_t isOK = 0; - - UsbCommand c = {CMD_READER_MIFARE, {true, 0, 0}}; - - // message - printf("-------------------------------------------------------------------------\n"); - printf("Executing command. Expected execution time: 25sec on average\n"); - printf("Press button on the proxmark3 device to abort both proxmark3 and client.\n"); - printf("-------------------------------------------------------------------------\n"); - - - while (true) { - clearCommandBuffer(); - SendCommand(&c); - - //flush queue - while (ukbhit()) { - int c = getchar(); (void) c; - } - - // wait cycle - while (true) { - printf("."); - fflush(stdout); - if (ukbhit()) { - return -5; - break; - } - - UsbCommand resp; - if (WaitForResponseTimeout(CMD_ACK, &resp, 1000)) { - isOK = resp.arg[0]; - if (isOK < 0) { - return isOK; - } - uid = (uint32_t)bytes_to_num(resp.d.asBytes + 0, 4); - 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 = (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."); - } - c.arg[0] = false; - - 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); - PrintAndLog("This is expected to happen in 25%% of all cases. Trying again with a different reader nonce..."); - 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) { - PrintAndLog("Found %u possible keys. Trying to authenticate with each of them ...\n", keycount); - } else { - PrintAndLog("Found a possible key. Trying to authenticate...\n"); - } - - *key = -1; - uint8_t keyBlock[USB_CMD_DATA_SIZE]; - int max_keys = USB_CMD_DATA_SIZE/6; - 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 (par_list == 0) { - num_to_bytes(last_keylist[i*max_keys + j], 6, keyBlock+(j*6)); - } else { - num_to_bytes(keylist[i*max_keys + j], 6, keyBlock+(j*6)); - } - } - if (!mfCheckKeys(0, 0, false, size, keyBlock, key)) { - break; - } - } - - if (*key != -1) { - free(last_keylist); - free(keylist); - break; - } else { - PrintAndLog("Authentication failed. Trying again..."); - free(last_keylist); - last_keylist = keylist; - } - } - - return 0; -} - - -int mfCheckKeys (uint8_t blockNo, uint8_t keyType, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){ - - *key = -1; - - 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 ((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; - else if ((*(uint64_t*)b & 0x00ff000000ff0000) > (*(uint64_t*)a & 0x00ff000000ff0000)) return 1; - else return -1; -} - -typedef - struct { - union { - struct Crypto1State *slhead; - uint64_t *keyhead; - } head; - union { - struct Crypto1State *sltail; - uint64_t *keytail; - } tail; - uint32_t len; - uint32_t uid; - uint32_t blockNo; - uint32_t keyType; - uint32_t nt; - uint32_t ks1; - } StateList_t; - - -// wrapper function for multi-threaded lfsr_recovery32 -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; - - statelist->head.slhead = lfsr_recovery32(statelist->ks1, statelist->nt ^ statelist->uid); - for (p1 = statelist->head.slhead; *(uint64_t *)p1 != 0; p1++); - statelist->len = p1 - statelist->head.slhead; - statelist->tail.sltail = --p1; - qsort(statelist->head.slhead, statelist->len, sizeof(uint64_t), Compare16Bits); - - 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; - uint32_t uid; - UsbCommand resp; - - StateList_t statelists[2]; - struct Crypto1State *p1, *p2, *p3, *p4; - - // flush queue - (void)WaitForResponseTimeout(CMD_ACK,NULL,100); - - UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}}; - memcpy(c.d.asBytes, key, 6); - SendCommand(&c); - - if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) { - return -1; - } - - if (resp.arg[0]) { - return resp.arg[0]; // error during nested - } - - memcpy(&uid, resp.d.asBytes, 4); - PrintAndLog("uid:%08x trgbl=%d trgkey=%x", uid, (uint16_t)resp.arg[2] & 0xff, (uint16_t)resp.arg[2] >> 8); - - for (i = 0; i < 2; i++) { - statelists[i].blockNo = resp.arg[2] & 0xff; - statelists[i].keyType = (resp.arg[2] >> 8) & 0xff; - statelists[i].uid = uid; - memcpy(&statelists[i].nt, (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4); - memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4); - } - - // calc keys - - pthread_t thread_id[2]; - - // create and run worker threads - for (i = 0; i < 2; i++) { - pthread_create(thread_id + i, NULL, nested_worker_thread, &statelists[i]); - } - - // wait for threads to terminate: - for (i = 0; i < 2; i++) { - pthread_join(thread_id[i], (void*)&statelists[i].head.slhead); - } - - - // the first 16 Bits of the cryptostate already contain part of our key. - // Create the intersection of the two lists based on these 16 Bits and - // roll back the cryptostate - p1 = p3 = statelists[0].head.slhead; - p2 = p4 = statelists[1].head.slhead; - while (p1 <= statelists[0].tail.sltail && p2 <= statelists[1].tail.sltail) { - if (Compare16Bits(p1, p2) == 0) { - struct Crypto1State savestate, *savep = &savestate; - savestate = *p1; - while(Compare16Bits(p1, savep) == 0 && p1 <= statelists[0].tail.sltail) { - *p3 = *p1; - lfsr_rollback_word(p3, statelists[0].nt ^ statelists[0].uid, 0); - p3++; - p1++; - } - savestate = *p2; - while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].tail.sltail) { - *p4 = *p2; - lfsr_rollback_word(p4, statelists[1].nt ^ statelists[1].uid, 0); - p4++; - p2++; - } - } - else { - while (Compare16Bits(p1, p2) == -1) p1++; - while (Compare16Bits(p1, p2) == 1) p2++; - } - } - *(uint64_t*)p3 = -1; - *(uint64_t*)p4 = -1; - statelists[0].len = p3 - statelists[0].head.slhead; - statelists[1].len = p4 - statelists[1].head.slhead; - statelists[0].tail.sltail=--p3; - statelists[1].tail.sltail=--p4; - - // the statelists now contain possible keys. The key we are searching for must be in the - // intersection of both lists. Create the intersection: - qsort(statelists[0].head.keyhead, statelists[0].len, sizeof(uint64_t), compare_uint64); - qsort(statelists[1].head.keyhead, statelists[1].len, sizeof(uint64_t), compare_uint64); - statelists[0].len = intersection(statelists[0].head.keyhead, statelists[1].head.keyhead); - - memset(resultKey, 0, 6); - // The list may still contain several key candidates. Test each of them with mfCheckKeys - for (i = 0; i < statelists[0].len; i++) { - uint8_t keyBlock[6]; - uint64_t key64; - crypto1_get_lfsr(statelists[0].head.slhead + i, &key64); - num_to_bytes(key64, 6, keyBlock); - key64 = 0; - if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, false, 1, keyBlock, &key64)) { - num_to_bytes(key64, 6, resultKey); - break; - } - } - - free(statelists[0].head.slhead); - free(statelists[1].head.slhead); - - return 0; -} - -// EMULATOR - -int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) { - UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}}; - SendCommand(&c); - - UsbCommand resp; - if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1; - memcpy(data, resp.d.asBytes, blocksCount * 16); - return 0; -} - -int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) { - UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, 0}}; - memcpy(c.d.asBytes, data, blocksCount * 16); - SendCommand(&c); - return 0; -} - -// "MAGIC" CARD - -int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) { - uint8_t isOK = 0; - - UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, 0, blockNo}}; - SendCommand(&c); - - UsbCommand resp; - if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) { - isOK = resp.arg[0] & 0xff; - memcpy(data, resp.d.asBytes, 16); - if (!isOK) return 2; - } else { - PrintAndLog("Command execute timeout"); - return 1; - } - return 0; -} - -int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uint8_t params) { - - uint8_t isOK = 0; - 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)) { - isOK = resp.arg[0] & 0xff; - if (uid != NULL) - memcpy(uid, resp.d.asBytes, 4); - if (!isOK) - return 2; - } else { - PrintAndLog("Command execute timeout"); - return 1; - } - - return 0; -} - -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 gen = 0, res; - - gen = mfCIdentify(); - - /* generation 1a magic card by default */ - uint8_t cmdParams = CSETBLOCK_SINGLE_OPER; - if (gen == 2) { - /* generation 1b magic card */ - cmdParams = CSETBLOCK_SINGLE_OPER | CSETBLOCK_MAGIC_1B; - } - - res = mfCGetBlock(0, oldblock0, cmdParams); - - if (res == 0) { - memcpy(block0, oldblock0, 16); - PrintAndLog("old block 0: %s", sprint_hex(block0,16)); - } else { - PrintAndLog("Couldn't get old data. Will write over the last bytes of Block 0."); - } - - // fill in the new values - // UID - memcpy(block0, uid, 4); - // Mifare UID BCC - 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]; - } - PrintAndLog("new block 0: %s", sprint_hex(block0, 16)); - - 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 -static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00}; - -// variables -char logHexFileName[FILE_PATH_SIZE] = {0x00}; -static uint8_t traceCard[4096] = {0x00}; -static char traceFileName[FILE_PATH_SIZE] = {0x00}; -static int traceState = TRACE_IDLE; -static uint8_t traceCurBlock = 0; -static uint8_t traceCurKey = 0; - -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 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)); -} - -int isBlockEmpty(int blockN) { - for (int i = 0; i < 16; i++) - if (traceCard[blockN * 16 + i] != 0) return 0; - - return 1; -} - -int isBlockTrailer(int blockN) { - return ((blockN & 0x03) == 0x03); -} - -int saveTraceCard(void) { - FILE * f; - - if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0; - - f = fopen(traceFileName, "w+"); - if ( !f ) return 1; - - for (int i = 0; i < 64; i++) { // blocks - for (int j = 0; j < 16; j++) // bytes - fprintf(f, "%02x", *(traceCard + i * 16 + j)); - if (i < 63) - fprintf(f,"\n"); - } - fclose(f); - return 0; -} - -int loadTraceCard(uint8_t *tuid) { - FILE * f; - char buf[64] = {0x00}; - uint8_t buf8[64] = {0x00}; - int i, blockNum; - - if (!isTraceCardEmpty()) - saveTraceCard(); - - memset(traceCard, 0x00, 4096); - memcpy(traceCard, tuid + 3, 4); - - FillFileNameByUID(traceFileName, tuid, ".eml", 7); - - f = fopen(traceFileName, "r"); - if (!f) return 1; - - blockNum = 0; - - while(!feof(f)){ - - memset(buf, 0, sizeof(buf)); - if (fgets(buf, sizeof(buf), f) == NULL) { - PrintAndLog("File reading error."); - fclose(f); - return 2; - } - - if (strlen(buf) < 32){ - if (feof(f)) break; - PrintAndLog("File content error. Block data must include 32 HEX symbols"); - fclose(f); - return 2; - } - for (i = 0; i < 32; i += 2) - sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]); - - memcpy(traceCard + blockNum * 16, buf8, 16); - - blockNum++; - } - fclose(f); - - return 0; -} - -int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) { - - if (traceCrypto1) - crypto1_destroy(traceCrypto1); - - traceCrypto1 = NULL; - - if (wantSaveToEmlFile) - loadTraceCard(tuid); - - traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3]; - traceCard[5] = sak; - memcpy(&traceCard[6], atqa, 2); - traceCurBlock = 0; - uid = bytes_to_num(tuid + 3, 4); - - traceState = TRACE_IDLE; - - return 0; -} - -void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){ - uint8_t bt = 0; - int i; - - if (len != 1) { - for (i = 0; i < len; i++) - data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i]; - } else { - bt = 0; - for (i = 0; i < 4; i++) - bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i; - - data[0] = bt; - } - 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, uint8_t parity, bool wantSaveToEmlFile) { - uint8_t data[64]; - - if (traceState == TRACE_ERROR) return 1; - if (len > 64) { - traceState = TRACE_ERROR; - return 1; - } - - memcpy(data, data_src, len); - if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) { - mf_crypto1_decrypt(traceCrypto1, data, len, 0); - uint8_t parity[16]; - oddparitybuf(data, len, parity); - PrintAndLog("dec> %s [%s]", sprint_hex(data, len), printBitsPar(parity, len)); - AddLogHex(logHexFileName, "dec> ", data, len); - } - - switch (traceState) { - case TRACE_IDLE: - // check packet crc16! - if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) { - PrintAndLog("dec> CRC ERROR!!!"); - AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!"); - traceState = TRACE_ERROR; // do not decrypt the next commands - return 1; - } - - // AUTHENTICATION - if ((len ==4) && ((data[0] == 0x60) || (data[0] == 0x61))) { - traceState = TRACE_AUTH1; - traceCurBlock = data[1]; - traceCurKey = data[0] == 60 ? 1:0; - return 0; - } - - // READ - if ((len ==4) && ((data[0] == 0x30))) { - traceState = TRACE_READ_DATA; - traceCurBlock = data[1]; - return 0; - } - - // WRITE - if ((len ==4) && ((data[0] == 0xA0))) { - traceState = TRACE_WRITE_OK; - traceCurBlock = data[1]; - return 0; - } - - // HALT - if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) { - traceState = TRACE_ERROR; // do not decrypt the next commands - return 0; - } - - return 0; - break; - - case TRACE_READ_DATA: - if (len == 18) { - traceState = TRACE_IDLE; - - if (isBlockTrailer(traceCurBlock)) { - memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4); - } else { - memcpy(traceCard + traceCurBlock * 16, data, 16); - } - if (wantSaveToEmlFile) saveTraceCard(); - return 0; - } else { - traceState = TRACE_ERROR; - return 1; - } - break; - - case TRACE_WRITE_OK: - if ((len == 1) && (data[0] == 0x0a)) { - traceState = TRACE_WRITE_DATA; - - return 0; - } else { - traceState = TRACE_ERROR; - return 1; - } - break; - - case TRACE_WRITE_DATA: - if (len == 18) { - traceState = TRACE_IDLE; - - memcpy(traceCard + traceCurBlock * 16, data, 16); - if (wantSaveToEmlFile) saveTraceCard(); - return 0; - } else { - traceState = TRACE_ERROR; - return 1; - } - break; - - case TRACE_AUTH1: - if (len == 4) { - traceState = TRACE_AUTH2; - 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; - return 1; - } - break; - - case TRACE_AUTH2: - if (len == 8) { - traceState = TRACE_AUTH_OK; - - 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; - return 1; - } - break; - - case TRACE_AUTH_OK: - if (len ==4) { - traceState = TRACE_IDLE; - - at_enc = bytes_to_num(data, 4); - 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); - - if (traceCurKey) { - num_to_bytes(lfsr, 6, traceCard + blockShift + 10); - } else { - num_to_bytes(lfsr, 6, traceCard + blockShift); - } - if (wantSaveToEmlFile) saveTraceCard(); - - if (traceCrypto1) { - crypto1_destroy(traceCrypto1); - } - - // set cryptosystem state - traceCrypto1 = lfsr_recovery64(ks2, ks3); - return 0; - } else { - traceState = TRACE_ERROR; - return 1; - } - break; - - default: - traceState = TRACE_ERROR; - return 1; - } - - 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 - uint32_t ar_enc; // encrypted reader response - uint32_t at_enc; // encrypted tag response - */ - if (traceCrypto1) { - crypto1_destroy(traceCrypto1); - } - ks2 = ar_enc ^ prng_successor(nt, 64); - ks3 = at_enc ^ prng_successor(nt, 96); - traceCrypto1 = lfsr_recovery64(ks2, ks3); - - mf_crypto1_decrypt(traceCrypto1, data, len, 0); - - PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) ); - crypto1_destroy(traceCrypto1); - return 0; -} - -/** 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; - - // 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); -} - -/* 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); - 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; - } - - // check respA - if (respA.arg[0] != 4) { - PrintAndLog("PRNG data error: Wrong length: %d", respA.arg[0]); - return -1; - } - - uint32_t nonce = bytes_to_num(respA.d.asBytes, respA.arg[0]); - return validate_prng_nonce(nonce); -}