mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-09-20 23:36:31 +08:00
94 lines
3.4 KiB
C
94 lines
3.4 KiB
C
//-----------------------------------------------------------------------------
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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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// Low frequency Stanley/PAC tag commands
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// NRZ, RF/32, 128 bits long (unknown cs)
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//-----------------------------------------------------------------------------
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#include "cmdlfpac.h"
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static int CmdHelp(const char *Cmd);
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//see NRZDemod for what args are accepted
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static int CmdPacDemod(const char *Cmd) {
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//NRZ
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if (!NRZrawDemod(Cmd, false)) {
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PrintAndLogEx(DEBUG, "DEBUG: Error - PAC: NRZ Demod failed");
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return 0;
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}
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size_t size = DemodBufferLen;
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int ans = detectPac(DemodBuffer, &size);
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if (ans < 0) {
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if (ans == -1)
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PrintAndLogEx(DEBUG, "DEBUG: Error - PAC: too few bits found");
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else if (ans == -2)
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PrintAndLogEx(DEBUG, "DEBUG: Error - PAC: preamble not found");
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else if (ans == -3)
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PrintAndLogEx(DEBUG, "DEBUG: Error - PAC: Size not correct: %d", size);
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else
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PrintAndLogEx(DEBUG, "DEBUG: Error - PAC: ans: %d", ans);
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return 0;
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}
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setDemodBuff(DemodBuffer, 128, ans);
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setClockGrid(g_DemodClock, g_DemodStartIdx + (ans * g_DemodClock));
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//got a good demod
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uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
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uint32_t raw2 = bytebits_to_byte(DemodBuffer + 32, 32);
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uint32_t raw3 = bytebits_to_byte(DemodBuffer + 64, 32);
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uint32_t raw4 = bytebits_to_byte(DemodBuffer + 96, 32);
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// preamble then appears to have marker bits of "10" CS?
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// 11111111001000000 10 01001100 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 00001101 10 10001100 10 100000001
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// unknown checksum 9 bits at the end
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PrintAndLogEx(NORMAL, "PAC/Stanley Tag Found -- Raw: %08X%08X%08X%08X", raw1, raw2, raw3, raw4);
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PrintAndLogEx(NORMAL, "\nHow the Raw ID is translated by the reader is unknown");
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return 1;
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}
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static int CmdPacRead(const char *Cmd) {
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lf_read(true, 4096 * 2 + 20);
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return CmdPacDemod(Cmd);
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}
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static command_t CommandTable[] = {
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{"help", CmdHelp, AlwaysAvailable, "This help"},
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{"demod", CmdPacDemod, AlwaysAvailable, "Demodulate an PAC tag from the GraphBuffer"},
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{"read", CmdPacRead, IfPm3Lf, "Attempt to read and extract tag data from the antenna"},
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{NULL, NULL, NULL, NULL}
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};
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static int CmdHelp(const char *Cmd) {
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(void)Cmd; // Cmd is not used so far
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CmdsHelp(CommandTable);
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return 0;
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}
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int CmdLFPac(const char *Cmd) {
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clearCommandBuffer();
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return CmdsParse(CommandTable, Cmd);
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}
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// by marshmellow
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// find PAC preamble in already demoded data
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int detectPac(uint8_t *dest, size_t *size) {
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if (*size < 128) return -1; //make sure buffer has data
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size_t startIdx = 0;
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uint8_t preamble[] = {1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0};
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if (!preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx))
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return -2; //preamble not found
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if (*size != 128) return -3; //wrong demoded size
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//return start position
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return (int)startIdx;
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}
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int demodPac(void) {
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return CmdPacDemod("");
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}
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