mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-09-21 15:56:21 +08:00
208 lines
6.7 KiB
C
208 lines
6.7 KiB
C
//-----------------------------------------------------------------------------
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// Copyright (C) Proxmark3 contributors. See AUTHORS.md for details.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// See LICENSE.txt for the text of the license.
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//-----------------------------------------------------------------------------
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// This simple mode encode, then emulate a Nedap identificator until button pressed
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// lots of code from client side, cmdlfnedap, util, etc.
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//-----------------------------------------------------------------------------
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#include "standalone.h" // standalone definitions
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#include "proxmark3_arm.h"
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#include "appmain.h"
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#include "fpgaloader.h"
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#include "lfops.h"
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#include "util.h"
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#include "dbprint.h"
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#include "string.h"
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#include "BigBuf.h"
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#include "crc16.h"
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#define MODULE_LONG_NAME "LF Nedap simple simulator"
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typedef struct _NEDAP_TAG {
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uint8_t subType;
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uint16_t customerCode;
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uint32_t id;
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uint8_t bIsLong;
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} NEDAP_TAG, *PNEDAP_TAG;
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const NEDAP_TAG Tag = {.subType = 0x5, .customerCode = 0x123, .id = 42424, .bIsLong = 1};
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static int NedapPrepareBigBuffer(const NEDAP_TAG *pTag);
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static void biphaseSimBitInverted(uint8_t c, int *n, uint8_t *phase);
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static void NedapGen(uint8_t subType, uint16_t customerCode, uint32_t id, bool isLong, uint8_t *data);
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static uint8_t isEven_64_63(const uint8_t *data);
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static inline uint32_t bitcount32(uint32_t a);
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static void bytes_to_bytebits(const void *src, const size_t srclen, void *dest);
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void ModInfo(void) {
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DbpString(" " MODULE_LONG_NAME);
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}
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void RunMod(void) {
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int n;
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StandAloneMode();
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Dbprintf("[=] " MODULE_LONG_NAME " -- started");
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FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
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Dbprintf("[=] NEDAP (%s) - ID: " _GREEN_("%05u") " subtype: " _GREEN_("%1u") " customer code: " _GREEN_("%u / 0x%03X"), Tag.bIsLong ? "128b" : "64b", Tag.id, Tag.subType, Tag.customerCode, Tag.customerCode);
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n = NedapPrepareBigBuffer(&Tag);
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do {
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WDT_HIT();
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if (data_available())
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break;
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SimulateTagLowFrequency(n, 0, true);
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} while (BUTTON_HELD(1000) == BUTTON_NO_CLICK);
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Dbprintf("[=] " MODULE_LONG_NAME " -- exiting");
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LEDsoff();
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}
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static int NedapPrepareBigBuffer(const NEDAP_TAG *pTag) {
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int ret = 0;
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uint8_t data[16], bitStream[sizeof(data) * 8], phase = 0;
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uint16_t i, size = pTag->bIsLong ? sizeof(data) : (sizeof(data) / 2);
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NedapGen(pTag->subType, pTag->customerCode, pTag->id, pTag->bIsLong, data);
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bytes_to_bytebits(data, size, bitStream);
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size <<= 3;
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for (i = 0; i < size; i++) {
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biphaseSimBitInverted(!bitStream[i], &ret, &phase);
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}
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if (phase == 1) { //run a second set inverted to keep phase in check
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for (i = 0; i < size; i++) {
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biphaseSimBitInverted(!bitStream[i], &ret, &phase);
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}
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}
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return ret;
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}
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static void biphaseSimBitInverted(uint8_t c, int *n, uint8_t *phase) {
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uint8_t *dest = BigBuf_get_addr();
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if (c) {
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memset(dest + (*n), c ^ 1 ^ *phase, 32);
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memset(dest + (*n) + 32, c ^ *phase, 32);
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} else {
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memset(dest + (*n), c ^ *phase, 64);
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*phase ^= 1;
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}
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*n += 64;
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}
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#define FIXED_71 0x71
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#define FIXED_40 0x40
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#define UNKNOWN_A 0x00
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#define UNKNOWN_B 0x00
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static const uint8_t translateTable[10] = {8, 2, 1, 12, 4, 5, 10, 13, 0, 9};
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static void NedapGen(uint8_t subType, uint16_t customerCode, uint32_t id, bool isLong, uint8_t *data) { // 8 or 16
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uint8_t buffer[7];
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uint8_t r1 = (uint8_t)(id / 10000);
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uint8_t r2 = (uint8_t)((id % 10000) / 1000);
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uint8_t r3 = (uint8_t)((id % 1000) / 100);
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uint8_t r4 = (uint8_t)((id % 100) / 10);
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uint8_t r5 = (uint8_t)(id % 10);
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// first part
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uint8_t idxC1 = r1;
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uint8_t idxC2 = (idxC1 + 1 + r2) % 10;
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uint8_t idxC3 = (idxC2 + 1 + r3) % 10;
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uint8_t idxC4 = (idxC3 + 1 + r4) % 10;
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uint8_t idxC5 = (idxC4 + 1 + r5) % 10;
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buffer[0] = 0xc0 | (subType & 0x0F);
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buffer[1] = (customerCode & 0x0FF0) >> 4;
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buffer[2] = ((customerCode & 0x000F) << 4) | translateTable[idxC1];
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buffer[3] = (translateTable[idxC2] << 4) | translateTable[idxC3];
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buffer[4] = (translateTable[idxC4] << 4) | translateTable[idxC5];
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// checksum
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init_table(CRC_XMODEM);
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uint16_t checksum = crc16_xmodem(buffer, 5);
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buffer[6] = ((checksum & 0x000F) << 4) | (buffer[4] & 0x0F);
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buffer[5] = (checksum & 0x00F0) | ((buffer[4] & 0xF0) >> 4);
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buffer[4] = ((checksum & 0x0F00) >> 4) | (buffer[3] & 0x0F);
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buffer[3] = ((checksum & 0xF000) >> 8) | ((buffer[3] & 0xF0) >> 4);
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// carry calc
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uint8_t carry = 0;
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for (uint8_t i = 0; i < sizeof(buffer); i++) {
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uint8_t tmp = buffer[sizeof(buffer) - 1 - i];
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data[7 - i] = ((tmp & 0x7F) << 1) | carry;
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carry = (tmp & 0x80) >> 7;
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}
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data[0] = 0xFE | carry;
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data[7] |= isEven_64_63(data);
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// second part
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if (isLong) {
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uint8_t id0 = r1;
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uint8_t id1 = (r2 << 4) | r3;
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uint8_t id2 = (r4 << 4) | r5;
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data[8] = (id2 >> 1);
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data[9] = ((id2 & 0x01) << 7) | (id1 >> 2);
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data[10] = ((id1 & 0x03) << 6) | (id0 >> 3);
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data[11] = ((id0 & 0x07) << 5) | (FIXED_71 >> 4);
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data[12] = ((FIXED_71 & 0x0F) << 4) | (FIXED_40 >> 5);
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data[13] = ((FIXED_40 & 0x1F) << 3) | (UNKNOWN_A >> 6);
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data[14] = ((UNKNOWN_A & 0x3F) << 2) | (UNKNOWN_B >> 7);
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data[15] = ((UNKNOWN_B & 0x7F) << 1);
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data[15] |= isEven_64_63(data + 8);
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}
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}
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static uint8_t isEven_64_63(const uint8_t *data) { // 8
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uint32_t tmp[2];
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memcpy(tmp, data, 8);
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return (bitcount32(tmp[0]) + (bitcount32(tmp[1] & 0xfeffffff))) & 1;
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}
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static void bytes_to_bytebits(const void *src, const size_t srclen, void *dest) {
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uint8_t *s = (uint8_t *)src, *d = (uint8_t *)dest;
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size_t i = srclen * 8, j = srclen;
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while (j--) {
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uint8_t b = s[j];
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d[--i] = (b >> 0) & 1;
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d[--i] = (b >> 1) & 1;
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d[--i] = (b >> 2) & 1;
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d[--i] = (b >> 3) & 1;
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d[--i] = (b >> 4) & 1;
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d[--i] = (b >> 5) & 1;
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d[--i] = (b >> 6) & 1;
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d[--i] = (b >> 7) & 1;
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}
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}
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static inline uint32_t bitcount32(uint32_t a) {
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#if defined __GNUC__
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return __builtin_popcountl(a);
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#else
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a = a - ((a >> 1) & 0x55555555);
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a = (a & 0x33333333) + ((a >> 2) & 0x33333333);
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return (((a + (a >> 4)) & 0x0f0f0f0f) * 0x01010101) >> 24;
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#endif
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}
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