X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/e0c635d19c58423d88ae698788a31c865e5554ab..6799b193741ead38211998950b10fb03fbf69d90:/client/mifarehost.c?ds=sidebyside diff --git a/client/mifarehost.c b/client/mifarehost.c index fc29e10e..e6ad6016 100644 --- a/client/mifarehost.c +++ b/client/mifarehost.c @@ -11,190 +11,202 @@ #include #include #include +#include #include "mifarehost.h" +#include "proxmark3.h" -// MIFARE +#define llx PRIx64 +// MIFARE int compar_int(const void * a, const void * b) { - return (*(uint64_t*)b - *(uint64_t*)a); + // didn't work: (the result is truncated to 32 bits) + //return (*(uint64_t*)b - *(uint64_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; } -// Compare countKeys structure -int compar_special_int(const void * a, const void * b) { - return (((countKeys *)b)->count - ((countKeys *)a)->count); +// 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; } -countKeys * uniqsort(uint64_t * possibleKeys, uint32_t size) { - int i, j = 0; - int count = 0; - countKeys *our_counts; - - qsort(possibleKeys, size, sizeof (uint64_t), compar_int); - - our_counts = calloc(size, sizeof(countKeys)); - if (our_counts == NULL) { - PrintAndLog("Memory allocation error for our_counts"); - return NULL; - } +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* 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); - for (i = 0; i < size; i++) { - if (possibleKeys[i+1] == possibleKeys[i]) { - count++; - } else { - our_counts[j].key = possibleKeys[i]; - our_counts[j].count = count; - j++; - count=0; - } - } - qsort(our_counts, j, sizeof(countKeys), compar_special_int); - return (our_counts); + return statelist->head.slhead; } -int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t * resultKeys) +int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t * resultKey, bool calibrate) { - int i, m, len; - uint8_t isEOF; + uint16_t i; uint32_t uid; - fnVector * vector = NULL; - countKeys *ck; - int lenVector = 0; - UsbCommand * resp = NULL; - - memset(resultKeys, 0x00, 16 * 6); + UsbCommand resp; + StateList_t statelists[2]; + struct Crypto1State *p1, *p2, *p3, *p4; + // flush queue - while (WaitForResponseTimeout(CMD_ACK, 500) != NULL) ; + WaitForResponseTimeout(CMD_ACK,NULL,100); - UsbCommand c = {CMD_MIFARE_NESTED, {blockNo, keyType, trgBlockNo + trgKeyType * 0x100}}; + UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}}; memcpy(c.d.asBytes, key, 6); - SendCommand(&c); - - PrintAndLog("\n"); - - // wait cycle - while (true) { - printf("."); - if (ukbhit()) { - getchar(); - printf("\naborted via keyboard!\n"); - break; - } - - resp = WaitForResponseTimeout(CMD_ACK, 1500); - - if (resp != NULL) { - isEOF = resp->arg[0] & 0xff; - - if (isEOF) break; - - len = resp->arg[1] & 0xff; - if (len == 0) continue; - - memcpy(&uid, resp->d.asBytes, 4); - PrintAndLog("uid:%08x len=%d trgbl=%d trgkey=%x", uid, len, resp->arg[2] & 0xff, (resp->arg[2] >> 8) & 0xff); - vector = (fnVector *) realloc((void *)vector, (lenVector + len) * sizeof(fnVector) + 200); - if (vector == NULL) { - PrintAndLog("Memory allocation error for fnVector. len: %d bytes: %d", lenVector + len, (lenVector + len) * sizeof(fnVector)); - break; - } - - for (i = 0; i < len; i++) { - vector[lenVector + i].blockNo = resp->arg[2] & 0xff; - vector[lenVector + i].keyType = (resp->arg[2] >> 8) & 0xff; - vector[lenVector + i].uid = uid; + SendCommand(&c); - memcpy(&vector[lenVector + i].nt, (void *)(resp->d.asBytes + 8 + i * 8 + 0), 4); - memcpy(&vector[lenVector + i].ks1, (void *)(resp->d.asBytes + 8 + i * 8 + 4), 4); - } + if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) { + return -1; + } - lenVector += len; - } + if (resp.arg[0]) { + return resp.arg[0]; // error during nested } - - if (!lenVector) { - PrintAndLog("Got 0 keys from proxmark."); - return 1; + + 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); } - printf("------------------------------------------------------------------\n"); // calc keys - struct Crypto1State* revstate = NULL; - struct Crypto1State* revstate_start = NULL; - uint64_t lfsr; - int kcount = 0; - pKeys *pk; - - if ((pk = (void *) malloc(sizeof(pKeys))) == NULL) return 1; - memset(pk, 0x00, sizeof(pKeys)); - - for (m = 0; m < lenVector; m++) { - // And finally recover the first 32 bits of the key - revstate = lfsr_recovery32(vector[m].ks1, vector[m].nt ^ vector[m].uid); - if (revstate_start == NULL) revstate_start = revstate; - while ((revstate->odd != 0x0) || (revstate->even != 0x0)) { - lfsr_rollback_word(revstate, vector[m].nt ^ vector[m].uid, 0); - crypto1_get_lfsr(revstate, &lfsr); - - // Allocate a new space for keys - if (((kcount % MEM_CHUNK) == 0) || (kcount >= pk->size)) { - pk->size += MEM_CHUNK; -//fprintf(stdout, "New chunk by %d, sizeof %d\n", kcount, pk->size * sizeof(uint64_t)); - pk->possibleKeys = (uint64_t *) realloc((void *)pk->possibleKeys, pk->size * sizeof(uint64_t)); - if (pk->possibleKeys == NULL) { - PrintAndLog("Memory allocation error for pk->possibleKeys"); - return 1; - } - } - pk->possibleKeys[kcount] = lfsr; - kcount++; - revstate++; - } - free(revstate_start); - revstate_start = NULL; - + 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]); } - // Truncate - if (kcount != 0) { - pk->size = --kcount; - if ((pk->possibleKeys = (uint64_t *) realloc((void *)pk->possibleKeys, pk->size * sizeof(uint64_t))) == NULL) { - PrintAndLog("Memory allocation error for pk->possibleKeys"); - return 1; - } + // wait for threads to terminate: + for (i = 0; i < 2; i++) { + pthread_join(thread_id[i], (void*)&statelists[i].head.slhead); } - PrintAndLog("Total keys count:%d", kcount); - ck = uniqsort(pk->possibleKeys, pk->size); - // fill key array - for (i = 0; i < 16 ; i++) { - num_to_bytes(ck[i].key, 6, (uint8_t*)(resultKeys + i * 6)); + // 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++; + } } - - // finalize - free(pk->possibleKeys); - free(pk); - free(ck); - free(vector); - + p3->even = 0; p3->odd = 0; + p4->even = 0; p4->odd = 0; + 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), compar_int); + qsort(statelists[1].head.keyhead, statelists[1].len, sizeof(uint64_t), compar_int); + + uint64_t *p5, *p6, *p7; + p5 = p7 = statelists[0].head.keyhead; + p6 = statelists[1].head.keyhead; + while (p5 <= statelists[0].tail.keytail && p6 <= statelists[1].tail.keytail) { + if (compar_int(p5, p6) == 0) { + *p7++ = *p5++; + p6++; + } + else { + while (compar_int(p5, p6) == -1) p5++; + while (compar_int(p5, p6) == 1) p6++; + } + } + statelists[0].len = p7 - statelists[0].head.keyhead; + statelists[0].tail.keytail=--p7; + + 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; } -int mfCheckKeys (uint8_t blockNo, uint8_t keyType, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){ +int mfCheckKeys (uint8_t blockNo, uint8_t keyType, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){ + *key = 0; - UsbCommand c = {CMD_MIFARE_CHKKEYS, {blockNo, keyType, 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 = WaitForResponseTimeout(CMD_ACK, 3000); - - if (resp == NULL) return 1; - if ((resp->arg[0] & 0xff) != 0x01) return 2; - *key = bytes_to_num(resp->d.asBytes, 6); + + clearCommandBuffer(); + 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; } @@ -202,51 +214,78 @@ int mfCheckKeys (uint8_t blockNo, uint8_t keyType, uint8_t keycnt, uint8_t * key int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) { UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}}; - - SendCommand(&c); - - UsbCommand * resp = WaitForResponseTimeout(CMD_ACK, 1500); - - if (resp == NULL) return 1; - memcpy(data, resp->d.asBytes, blocksCount * 16); + clearCommandBuffer(); + 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); + return mfEmlSetMem_xt(data, blockNum, blocksCount, 16); +} + +int mfEmlSetMem_xt(uint8_t *data, int blockNum, int blocksCount, int blockBtWidth) { + UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, blockBtWidth}}; + memcpy(c.d.asBytes, data, blocksCount * blockBtWidth); + + clearCommandBuffer(); SendCommand(&c); return 0; } // "MAGIC" CARD -int mfCSetUID(uint8_t *uid, uint8_t *oldUID, int wantWipe) { +int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, uint8_t wipecard) { + + uint8_t params = MAGIC_SINGLE; uint8_t block0[16]; - memset(block0, 0, 16); + memset(block0, 0x00, sizeof(block0)); + + + int old = mfCGetBlock(0, block0, params); + if (old == 0) { + PrintAndLog("old block 0: %s", sprint_hex(block0, sizeof(block0))); + } 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); - block0[4] = block0[0]^block0[1]^block0[2]^block0[3]; // Mifare UID BCC - // mifare classic SAK(byte 5) and ATQA(byte 6 and 7) - block0[5] = 0x88; - block0[6] = 0x04; - block0[7] = 0x00; + // 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)); + + if ( wipecard ) params |= MAGIC_WIPE; + if ( oldUID == NULL) params |= MAGIC_UID; - return mfCSetBlock(0, block0, oldUID, wantWipe, CSETBLOCK_SINGLE_OPER); + return mfCSetBlock(0, block0, oldUID, params); } -int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, int wantWipe, uint8_t params) { - uint8_t isOK = 0; +int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, uint8_t params) { - UsbCommand c = {CMD_MIFARE_EML_CSETBLOCK, {wantWipe, params & (0xFE | (uid == NULL ? 0:1)), blockNo}}; + uint8_t isOK = 0; + UsbCommand c = {CMD_MIFARE_CSETBLOCK, {params, blockNo, 0}}; memcpy(c.d.asBytes, data, 16); + clearCommandBuffer(); SendCommand(&c); - - UsbCommand * resp = WaitForResponseTimeout(CMD_ACK, 1500); - - if (resp != NULL) { - isOK = resp->arg[0] & 0xff; - if (uid != NULL) memcpy(uid, resp->d.asBytes, 4); - if (!isOK) return 2; + 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; @@ -256,15 +295,13 @@ int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, int wantWipe, uint int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) { uint8_t isOK = 0; - - UsbCommand c = {CMD_MIFARE_EML_CGETBLOCK, {params, 0, blockNo}}; + UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, blockNo, 0}}; + clearCommandBuffer(); SendCommand(&c); - - UsbCommand * resp = WaitForResponseTimeout(CMD_ACK, 1500); - - if (resp != NULL) { - isOK = resp->arg[0] & 0xff; - memcpy(data, resp->d.asBytes, 16); + 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"); @@ -279,25 +316,26 @@ int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) { static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00}; // variables -char logHexFileName[200] = {0x00}; +char logHexFileName[FILE_PATH_SIZE] = {0x00}; static uint8_t traceCard[4096] = {0x00}; -static char traceFileName[20]; +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; -uint32_t ks2; -uint32_t ks3; +struct Crypto1State *revstate = NULL; + +uint64_t key = 0; +uint32_t ks2 = 0; +uint32_t ks3 = 0; -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 = 0; // serial number +uint32_t nt =0; // tag challenge +uint32_t nr_enc =0; // encrypted reader challenge +uint32_t ar_enc =0; // encrypted reader response +uint32_t at_enc =0; // encrypted tag response int isTraceCardEmpty(void) { return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0)); @@ -316,26 +354,36 @@ int isBlockTrailer(int blockN) { int loadTraceCard(uint8_t *tuid) { FILE * f; - char buf[64]; - uint8_t buf8[64]; + char buf[64] = {0x00}; + uint8_t buf8[64] = {0x00}; int i, blockNum; - if (!isTraceCardEmpty()) saveTraceCard(); + 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)); - fgets(buf, sizeof(buf), f); + 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) @@ -356,22 +404,27 @@ int saveTraceCard(void) { 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)); fprintf(f,"\n"); } fclose(f); - return 0; } int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) { - if (traceCrypto1) crypto1_destroy(traceCrypto1); + if (traceCrypto1) + crypto1_destroy(traceCrypto1); + traceCrypto1 = NULL; - if (wantSaveToEmlFile) loadTraceCard(tuid); + if (wantSaveToEmlFile) + loadTraceCard(tuid); + traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3]; traceCard[5] = sak; memcpy(&traceCard[6], atqa, 2); @@ -419,10 +472,16 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) { switch (traceState) { case TRACE_IDLE: - // TODO: check packet crc16! + // 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))) { + if ((len == 4) && ((data[0] == 0x60) || (data[0] == 0x61))) { traceState = TRACE_AUTH1; traceCurBlock = data[1]; traceCurKey = data[0] == 60 ? 1:0; @@ -470,7 +529,7 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) { break; case TRACE_WRITE_OK: - if ((len == 1) && (data[0] = 0x0a)) { + if ((len == 1) && (data[0] == 0x0a)) { traceState = TRACE_WRITE_DATA; return 0; @@ -496,7 +555,6 @@ 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); return 0; } else { @@ -525,34 +583,25 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) { at_enc = bytes_to_num(data, 4); // decode key here) - if (!traceCrypto1) { - 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); - }else{ - 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); + 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, &key); + printf("Key: %012"llx"\n",key); + AddLogUint64(logHexFileName, "key: ", key); 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); + num_to_bytes(key, 6, traceCard + blockShift + 10); } else { - num_to_bytes(lfsr, 6, traceCard + blockShift); + num_to_bytes(key, 6, traceCard + blockShift); } if (wantSaveToEmlFile) saveTraceCard(); @@ -565,7 +614,7 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) { // nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt; - /* traceCrypto1 = crypto1_create(lfsr); // key in lfsr + /* traceCrypto1 = crypto1_create(key); // key in lfsr crypto1_word(traceCrypto1, nt ^ uid, 0); crypto1_word(traceCrypto1, ar, 1); crypto1_word(traceCrypto1, 0, 0); @@ -585,3 +634,29 @@ int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) { return 0; } + +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 nr_enc; // encrypted reader challenge + uint32_t ar_enc; // encrypted reader response + uint32_t at_enc; // encrypted tag response + */ + + struct Crypto1State *pcs = NULL; + + ks2 = ar_enc ^ prng_successor(nt, 64); + ks3 = at_enc ^ prng_successor(nt, 96); + + PrintAndLog("Decrypting data with:"); + PrintAndLog(" nt: %08x",nt); + PrintAndLog(" ar_enc: %08x",ar_enc); + PrintAndLog(" at_enc: %08x",at_enc); + PrintAndLog("\nEncrypted data: [%s]", sprint_hex(data,len) ); + + pcs = lfsr_recovery64(ks2, ks3); + mf_crypto1_decrypt(pcs, data, len, FALSE); + PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) ); + crypto1_destroy(pcs); + return 0; +}