//-----------------------------------------------------------------------------
// Authored by Craig Young <cyoung@tripwire.com> based on cmdlfhid.c structure
//
// cmdlfhid.c is Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
//
// 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.
//-----------------------------------------------------------------------------
// Low frequency AWID26 commands
//-----------------------------------------------------------------------------

#include <stdio.h>      // sscanf
#include "proxmark3.h"  // Definitions, USB controls, etc
#include "ui.h"         // PrintAndLog
#include "cmdparser.h"  // CmdsParse, CmdsHelp
#include "cmdlfawid.h"  // AWID function declarations
#include "lfdemod.h"    // parityTest
#include "cmdmain.h"
static int CmdHelp(const char *Cmd);

int usage_lf_awid_fskdemod(void) {
  PrintAndLog("Enables AWID26 compatible reader mode printing details of scanned AWID26 tags.");
  PrintAndLog("By default, values are printed and logged until the button is pressed or another USB command is issued.");
  PrintAndLog("If the ['1'] option is provided, reader mode is exited after reading a single AWID26 card.");
  PrintAndLog("");
  PrintAndLog("Usage:  lf awid fskdemod ['1']");
  PrintAndLog("Options :");
  PrintAndLog("  1 : (optional) stop after reading a single card");
  PrintAndLog("");
  PrintAndLog("   sample : lf awid fskdemod");
  PrintAndLog("          : lf awid fskdemod 1");
  return 0;
}

int usage_lf_awid_sim(void) {
  PrintAndLog("Enables simulation of AWID26 card with specified facility-code and card number.");
  PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
  PrintAndLog("Per AWID26 format, the facility-code is 8-bit and the card number is 16-bit.  Larger values are truncated.");
  PrintAndLog("");
  PrintAndLog("Usage:  lf awid sim <Facility-Code> <Card-Number>");
  PrintAndLog("Options :");
  PrintAndLog("  <Facility-Code> :  8-bit value AWID facility code");
  PrintAndLog("  <Card Number>   : 16-bit value AWID card number");
  PrintAndLog("");
  PrintAndLog("sample   : lf awid sim 224 1337");
  return 0;
}

int usage_lf_awid_clone(void) {
  PrintAndLog("Enables cloning of AWID26 card with specified facility-code and card number onto T55x7.");
  PrintAndLog("The T55x7 must be on the antenna when issuing this command.  T55x7 blocks are calculated and printed in the process.");
  PrintAndLog("Per AWID26 format, the facility-code is 8-bit and the card number is 16-bit.  Larger values are truncated.");
  PrintAndLog("");
  PrintAndLog("Usage:  lf awid clone <Facility-Code> <Card-Number>");
  PrintAndLog("Options :");
  PrintAndLog("  <Facility-Code> :  8-bit value AWID facility code");
  PrintAndLog("  <Card Number>   : 16-bit value AWID card number");
  PrintAndLog("");
  PrintAndLog("sample  : lf awid clone 224 1337");
  return 0;
}

int CmdAWIDDemodFSK(const char *Cmd) {
  int findone = 0;
  if (Cmd[0] == 'h' || Cmd[0] == 'H') return usage_lf_awid_fskdemod();
  
  if (Cmd[0] == '1') findone = 1;
  
  UsbCommand c = {CMD_AWID_DEMOD_FSK, {findone, 0, 0}};
  clearCommandBuffer();
  SendCommand(&c);
  return 0;   
}

int getAWIDBits(unsigned int fc, unsigned int cn, uint8_t *AWIDBits)
{
	//int i;
	uint32_t fcode = (fc & 0x000000FF);
	uint32_t cnum = (cn & 0x0000FFFF);
	uint32_t uBits = 0;
  
	if (fcode != fc)
		PrintAndLog("NOTE: Facility code truncated for AWID26 format (8-bit facility code)");
	if (cnum!=cn)
		PrintAndLog("NOTE: Card number was truncated for AWID26 format (16-bit card number)");

	uint8_t pre[] = {0x01, 0x1D, 0x80, 0x00,0x00,0x00,0x00, 0x11, 0x11, 0x11, 0x11, 0x11};
	memcpy(AWIDBits, pre , sizeof(pre));
	
	// AWIDBits[0] = 0x01; // 6-bit Preamble with 2 parity bits
	// AWIDBits[1] = 0x1D; // First byte from card format (26-bit) plus parity bits
	// AWIDBits[2] = 0x80; // Set the next two bits as 0b10 to finish card format

	// for (i = 7; i<12; i++)
		// AWIDBits[i]=0x11;
	
	uBits = (fcode<<4) + (cnum>>12);
	
	if (!parityTest(uBits,12,0)) AWIDBits[2] |= (1<<5); // If not already even parity, set bit to make even
	
	uBits = AWIDBits[2]>>5;
	
	if (!parityTest(uBits, 3, 1)) AWIDBits[2] |= (1<<4);
	
	uBits = fcode>>5; // first 3 bits of facility-code
	AWIDBits[2] += (uBits<<1);
	
	if (!parityTest(uBits, 3, 1)) AWIDBits[2]++; // Set parity bit to make odd parity
	
	uBits = (fcode & 0x1C)>>2;
	AWIDBits[3] = 0;
	
	if (!parityTest(uBits,3,1)) AWIDBits[3] |= (1<<4);
	
	AWIDBits[3] += (uBits<<5);
	uBits = ((fcode & 0x3)<<1) + ((cnum & 0x8000)>>15); // Grab/shift 2 LSBs from facility code and add shifted MSB from cardnum
	
	if (!parityTest(uBits,3,1))	AWIDBits[3]++; // Set LSB for parity
	
	AWIDBits[3]+= (uBits<<1);
	uBits = (cnum & 0x7000)>>12;
	AWIDBits[4] = uBits<<5;
	
	if (!parityTest(uBits,3,1))	AWIDBits[4] |= (1<<4);
	
	uBits = (cnum & 0x0E00)>>9;
	AWIDBits[4] += (uBits<<1);
	
	if (!parityTest(uBits,3,1))	AWIDBits[4]++; // Set LSB for parity
	
	uBits = (cnum & 0x1C0)>>6; // Next bits from card number
	AWIDBits[5]=(uBits<<5);
	
	if (!parityTest(uBits,3,1))	AWIDBits[5] |= (1<<4); // Set odd parity bit as needed
	
	uBits = (cnum & 0x38)>>3;
	AWIDBits[5]+= (uBits<<1);
	
	if (!parityTest(uBits,3,1))	AWIDBits[5]++; // Set odd parity bit as needed
	
	uBits = (cnum & 0x7); // Last three bits from card number!
	AWIDBits[6] = (uBits<<5);
	
	if (!parityTest(uBits,3,1))	AWIDBits[6] |= (1<<4);
	
	uBits = (cnum & 0x0FFF);
	
	if (!parityTest(uBits,12,1))
		AWIDBits[6] |= (1<<3);
	else
		AWIDBits[6]++;
	
	return 1;
}

int CmdAWIDSim(const char *Cmd)
{
	uint32_t fcode = 0, cnum = 0, fc=0, cn=0, i=0;
	uint8_t bits[12];
	uint8_t *bs=bits;

	uint64_t arg1 = (10<<8) + 8; // fcHigh = 10, fcLow = 8
	uint64_t arg2 = 50; // clk RF/50 invert=0
  
	if (sscanf(Cmd, "%u %u", &fc, &cn ) != 2) return usage_lf_awid_sim();

	fcode = (fc & 0x000000FF);
	cnum = (cn & 0x0000FFFF);
	
	if (fc!=fcode) PrintAndLog("Facility-Code (%u) truncated to 8-bits: %u", fc, fcode);
	if (cn!=cnum)  PrintAndLog("Card number (%u) truncated to 16-bits: %u", cn, cnum);
	
	PrintAndLog("Emulating AWID26 -- FC: %u; CN: %u\n", fcode, cnum);
	PrintAndLog("Press pm3-button to abort simulation or run another command");
	
	if (!getAWIDBits(fc, cn, bs)) {
		PrintAndLog("Error with tag bitstream generation.");
		return 1;
	}
	// AWID uses: fcHigh: 10, fcLow: 8, clk: 50, invert: 0
	PrintAndLog("Running 'lf simfsk c 50 H 10 L 8 d %s'", sprint_hex(bs, sizeof(bs)));
  
	// arg1 --- fcHigh<<8 + fcLow
	// arg2 --- Inversion and clk setting
	// 96   --- Bitstream length: 96-bits == 12 bytes
	UsbCommand c = {CMD_FSK_SIM_TAG, {arg1, arg2, 96}};  

	for (i=0; i < 96; i++)
		c.d.asBytes[i] = (bs[i/8] & (1<<(7-(i%8)))) ? 1 : 0;

	clearCommandBuffer();
	SendCommand(&c);
	return 0;
}

int CmdAWIDClone(const char *Cmd)
{
	uint32_t blocks[4] = {0x00107060, 0, 0, 0x11111111};
	uint32_t fc=0, cn=0, i=0;
	uint8_t bits[12];
	uint8_t *bs=bits;
	
	if (sscanf(Cmd, "%u %u", &fc, &cn ) != 2) return usage_lf_awid_clone();

	if ((fc & 0xFF) != fc) {
		fc &= 0xFF;
		PrintAndLog("Facility-Code Truncated to 8-bits (AWID26): %u", fc);
	}

	if ((cn & 0xFFFF) != cn) {
		cn &= 0xFFFF;
		PrintAndLog("Card Number Truncated to 16-bits (AWID26): %u", cn);
	}
	
	if ( !getAWIDBits(fc, cn, bs)) {
		PrintAndLog("Error with tag bitstream generation.");
		return 1;
	}	

	PrintAndLog("Preparing to clone AWID26 to T55x7 with FC: %u, CN: %u ", fc, cn);
	PrintAndLog("Raw: %s", sprint_hex(bs, sizeof(bs)));

	blocks[1] = (bs[0]<<24) + (bs[1]<<16) + (bs[2]<<8) + (bs[3]);
	blocks[2] = (bs[4]<<24) + (bs[5]<<16) + (bs[6]<<8) + (bs[7]);
	
	PrintAndLog("Blk | Data ");
	PrintAndLog("----+------------");
	PrintAndLog(" 00 | 0x%08x", blocks[0]);
	PrintAndLog(" 01 | 0x%08x", blocks[1]);
	PrintAndLog(" 02 | 0x%08x", blocks[2]);
	PrintAndLog(" 03 | 0x%08x", blocks[3]);	
	
	UsbCommand resp;
	UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};

	for (i=0; i<4; i++) {
		c.arg[0] = blocks[i];
		c.arg[1] = i;
		clearCommandBuffer();
		SendCommand(&c);
		if (!WaitForResponseTimeout(CMD_ACK, &resp, 1000)){
			PrintAndLog("Error occurred, device did not respond during write operation.");
			return -1;
		}
	}
	return 0;
}

static command_t CommandTable[] = 
{
	{"help",      CmdHelp,         1, "This help"},
	{"fskdemod",  CmdAWIDDemodFSK, 0, "['1'] Realtime AWID FSK demodulator (option '1' for one tag only)"},
	{"sim",       CmdAWIDSim,      0, "<Facility-Code> <Card Number> -- AWID tag simulator"},
	{"clone",     CmdAWIDClone,    0, "<Facility-Code> <Card Number> -- Clone AWID to T55x7 (tag must be in range of antenna)"},
	{NULL, NULL, 0, NULL}
};

int CmdLFAWID(const char *Cmd)
{
	CmdsParse(CommandTable, Cmd);
	return 0;
}

int CmdHelp(const char *Cmd)
{
	CmdsHelp(CommandTable);
	return 0;
}