mirror of
https://github.com/Proxmark/proxmark3.git
synced 2024-09-21 15:26:35 +08:00
6a1f2d82bb
- buffers were too small to handle 256 byte frames - parity bits were only handled for up to 32 byte frames - trace format was inefficient - removed parity calculation from decoders in iclass.c (parity not used on air anyway)
175 lines
4.4 KiB
C
175 lines
4.4 KiB
C
//-----------------------------------------------------------------------------
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// Merlok - 2012
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// Routines to support mifare classic sniffer.
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//-----------------------------------------------------------------------------
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#include "mifaresniff.h"
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#include "apps.h"
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static int sniffState = SNF_INIT;
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static uint8_t sniffUIDType;
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static uint8_t sniffUID[8];
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static uint8_t sniffATQA[2];
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static uint8_t sniffSAK;
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static uint8_t sniffBuf[16];
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static uint32_t timerData = 0;
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bool MfSniffInit(void){
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memset(sniffUID, 0x00, 8);
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memset(sniffATQA, 0x00, 2);
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sniffSAK = 0;
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sniffUIDType = SNF_UID_4;
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return FALSE;
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}
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bool MfSniffEnd(void){
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LED_B_ON();
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cmd_send(CMD_ACK,0,0,0,0,0);
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LED_B_OFF();
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return FALSE;
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}
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bool RAMFUNC MfSniffLogic(const uint8_t *data, uint16_t len, uint8_t *parity, uint16_t bitCnt, bool reader) {
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if (reader && (len == 1) && (bitCnt == 7)) { // reset on 7-Bit commands from reader
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sniffState = SNF_INIT;
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}
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switch (sniffState) {
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case SNF_INIT:{
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if ((len == 1) && (reader) && (bitCnt == 7) ) { // REQA or WUPA from reader
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sniffUIDType = SNF_UID_4;
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memset(sniffUID, 0x00, 8);
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memset(sniffATQA, 0x00, 2);
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sniffSAK = 0;
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sniffState = SNF_WUPREQ;
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}
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break;
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}
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case SNF_WUPREQ:{
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if ((!reader) && (len == 2)) { // ATQA from tag
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memcpy(sniffATQA, data, 2);
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sniffState = SNF_ATQA;
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}
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break;
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}
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case SNF_ATQA:{
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if ((reader) && (len == 2) && (data[0] == 0x93) && (data[1] == 0x20)) { // Select ALL from reader
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sniffState = SNF_ANTICOL1;
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}
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break;
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}
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case SNF_ANTICOL1:{
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if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) { // UID from tag (CL1)
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memcpy(sniffUID + 3, data, 4);
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sniffState = SNF_UID1;
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}
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break;
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}
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case SNF_UID1:{
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if ((reader) && (len == 9) && (data[0] == 0x93) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) { // Select 4 Byte UID from reader
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sniffState = SNF_SAK;
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}
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break;
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}
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case SNF_SAK:{
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if ((!reader) && (len == 3) && (CheckCrc14443(CRC_14443_A, data, 3))) { // SAK from card?
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sniffSAK = data[0];
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if (sniffUID[3] == 0x88) { // CL2 UID part to be expected
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sniffState = SNF_ANTICOL2;
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} else { // select completed
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sniffState = SNF_CARD_IDLE;
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}
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}
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break;
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}
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case SNF_ANTICOL2:{
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if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) { // CL2 UID
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memcpy(sniffUID, sniffUID+4, 3);
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memcpy(sniffUID+3, data, 4);
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sniffUIDType = SNF_UID_7;
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sniffState = SNF_UID2;
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}
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break;
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}
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case SNF_UID2:{
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if ((reader) && (len == 9) && (data[0] == 0x95) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) { // Select 2nd part of 7 Byte UID
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sniffState = SNF_SAK;
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}
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break;
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}
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case SNF_CARD_IDLE:{ // trace the card select sequence
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sniffBuf[0] = 0xFF;
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sniffBuf[1] = 0xFF;
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memcpy(sniffBuf + 2, sniffUID, 7);
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memcpy(sniffBuf + 9, sniffATQA, 2);
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sniffBuf[11] = sniffSAK;
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sniffBuf[12] = 0xFF;
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sniffBuf[13] = 0xFF;
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LogTrace(sniffBuf, 14, 0, 0, NULL, TRUE);
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} // intentionally no break;
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case SNF_CARD_CMD:{
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LogTrace(data, len, 0, 0, NULL, TRUE);
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sniffState = SNF_CARD_RESP;
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timerData = GetTickCount();
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break;
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}
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case SNF_CARD_RESP:{
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LogTrace(data, len, 0, 0, NULL, FALSE);
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sniffState = SNF_CARD_CMD;
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timerData = GetTickCount();
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break;
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}
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default:
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sniffState = SNF_INIT;
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break;
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}
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return FALSE;
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}
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bool RAMFUNC MfSniffSend(uint16_t maxTimeoutMs) {
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if (traceLen && (GetTickCount() > timerData + maxTimeoutMs)) {
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return intMfSniffSend();
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}
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return FALSE;
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}
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// internal sending function. not a RAMFUNC.
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bool intMfSniffSend() {
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int pckSize = 0;
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int pckLen = traceLen;
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int pckNum = 0;
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FpgaDisableSscDma();
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while (pckLen > 0) {
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pckSize = MIN(USB_CMD_DATA_SIZE, pckLen);
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LED_B_ON();
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cmd_send(CMD_ACK, 1, pckSize, pckNum, trace + traceLen - pckLen, pckSize);
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LED_B_OFF();
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pckLen -= pckSize;
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pckNum++;
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}
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LED_B_ON();
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cmd_send(CMD_ACK,2,0,0,0,0);
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LED_B_OFF();
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iso14a_clear_trace();
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return TRUE;
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}
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