//-----------------------------------------------------------------------------
// Ultralight Code (c) 2013,2014 Midnitesnake & Andy Davies of Pentura
//
// 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.
//-----------------------------------------------------------------------------
// High frequency MIFARE ULTRALIGHT (C) commands
//-----------------------------------------------------------------------------
#include "loclass/des.h"
#include "cmdhfmfu.h"
#include "cmdhfmf.h"
#include "cmdhf14a.h"
#include "mifare.h"

#define MAX_ULTRA_BLOCKS   0x0f
#define MAX_ULTRAC_BLOCKS  0x2f
//#define MAX_ULTRAC_BLOCKS  0x2c

static int CmdHelp(const char *Cmd);

int CmdHF14AMfUInfo(const char *Cmd){

	uint8_t datatemp[7] = {0x00};
	uint8_t isOK  = 0;
	uint8_t data[16] = {0x00};

	UsbCommand c = {CMD_MIFAREU_READCARD, {0, 4}};
	SendCommand(&c);
	UsbCommand resp;

	if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {
		isOK  = resp.arg[0] & 0xff;
		memcpy(data, resp.d.asBytes, sizeof(data));

		if (!isOK) {
			PrintAndLog("Error reading from tag");
			return -1;
		}
	} else {
		PrintAndLog("Command execute timed out");
		return -1;
	}

	PrintAndLog("\n-- Tag Information ---------");
	PrintAndLog("-------------------------------------------------------------");
	
	UsbCommand cmd = {CMD_READER_ISO_14443a, {ISO14A_CONNECT | ISO14A_RAW | ISO14A_APPEND_CRC , 1, 0}};
	cmd.d.asBytes[0] = 0x60;
	SendCommand(&cmd);
	WaitForResponse(CMD_ACK, &resp);
	
	if ( resp.arg[0] ) {
		if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {

			uint8_t version[8] = {0,0,0,0,0,0,0,0};
			memcpy(&version, resp.d.asBytes, sizeof(version));
			uint8_t len  = resp.arg[0] & 0xff;
			switch (len) {
			// todo, identify "Magic UL-C tags".  // they usually have a static nonce response to 0x1A command.
			// UL-EV1, size, check version[6] == 0x0b (smaller)  0x0b * 4 == 48
				case 0x0A:PrintAndLog("        TYPE : NXP MIFARE Ultralight EV1 %d bytes", (version[6] == 0xB) ? 48 : 128);	break;				
				case 0x01:PrintAndLog("        TYPE : NXP MIFARE Ultralight C");break;
				case 0x00:PrintAndLog("        TYPE : NXP MIFARE Ultralight");break;
			}
		}
	}
	// TODO:
	// Answers to 0x1A == UL-C
	// NONCE seems to be fixed for my Magic UL-C.  How to detect a Magic UL?
	// maybe read Block0, change 1 byte, write back, and see if it failes or not.  If magic,  revert changes made?
	
	// UID
	memcpy( datatemp, data, 3);
	memcpy( datatemp+3, data+4, 4);
	
	PrintAndLog("MANUFACTURER : %s", getTagInfo(datatemp[0]));
	PrintAndLog("         UID : %s ", sprint_hex(datatemp, 7));
	// BBC
	// CT (cascade tag byte) 0x88 xor SN0 xor SN1 xor SN2 
	int crc0 = 0x88 ^ data[0] ^ data[1] ^data[2];
	if ( data[3] == crc0 )
		PrintAndLog("        BCC0 : %02x - Ok", data[3]);
	else
		PrintAndLog("        BCC0 : %02x - crc should be %02x", data[3], crc0);
		
	int crc1 = data[4] ^ data[5] ^ data[6] ^data[7];
	if ( data[8] == crc1 )
		PrintAndLog("        BCC1 : %02x - Ok", data[8]);
	else
		PrintAndLog("        BCC1 : %02x - crc should be %02x", data[8], crc1 );
	
	PrintAndLog("    Internal : %s ", sprint_hex(data + 9, 1));
	
	memcpy(datatemp, data+10, 2);
	PrintAndLog("        Lock : %s - %s", sprint_hex(datatemp, 2),printBits( 2, &datatemp) );
	PrintAndLog("  OneTimePad : %s ", sprint_hex(data + 3*4, 4));
	PrintAndLog("");
	return 0;
}

//
//  Mifare Ultralight Write Single Block
//
int CmdHF14AMfUWrBl(const char *Cmd){
	uint8_t blockNo    = -1;
	bool chinese_card  = FALSE;
	uint8_t bldata[16] = {0x00};
	UsbCommand resp;

	char cmdp = param_getchar(Cmd, 0);
	if (strlen(Cmd) < 3 || cmdp == 'h' || cmdp == 'H') {
		PrintAndLog("Usage:  hf mfu wrbl <block number> <block data (8 hex symbols)> [w]");
		PrintAndLog("       [block number]");
		PrintAndLog("       [block data] - (8 hex symbols)");
		PrintAndLog("       [w] - Chinese magic ultralight tag");
		PrintAndLog("");
		PrintAndLog("        sample: hf mfu wrbl 0 01020304");
		PrintAndLog("");		
		return 0;
	}       
	
	blockNo = param_get8(Cmd, 0);

	if (blockNo > MAX_ULTRA_BLOCKS){
		PrintAndLog("Error: Maximum number of blocks is 15 for Ultralight Cards!");
		return 1;
	}
	
	if (param_gethex(Cmd, 1, bldata, 8)) {
		PrintAndLog("Block data must include 8 HEX symbols");
		return 1;
	}
	
	if (strchr(Cmd,'w') != 0  || strchr(Cmd,'W') != 0 ) {
		chinese_card = TRUE; 
	}
	
	if ( blockNo <= 3) {
		if (!chinese_card){
			PrintAndLog("Access Denied");
		} else {
			PrintAndLog("--specialblock no:%02x", blockNo);
			PrintAndLog("--data: %s", sprint_hex(bldata, 4));
			UsbCommand d = {CMD_MIFAREU_WRITEBL, {blockNo}};
			memcpy(d.d.asBytes,bldata, 4);
			SendCommand(&d);
			if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
				uint8_t isOK  = resp.arg[0] & 0xff;
				PrintAndLog("isOk:%02x", isOK);
			} else {
				PrintAndLog("Command execute timeout");
			}  
		}
	} else {
		PrintAndLog("--block no:%02x", blockNo);
		PrintAndLog("--data: %s", sprint_hex(bldata, 4));        	
		UsbCommand e = {CMD_MIFAREU_WRITEBL, {blockNo}};
		memcpy(e.d.asBytes,bldata, 4);
		SendCommand(&e);
		if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
			uint8_t isOK  = resp.arg[0] & 0xff;
			PrintAndLog("isOk:%02x", isOK);
		} else {
			PrintAndLog("Command execute timeout");
		}
	}
	return 0;
}

//
//  Mifare Ultralight Read Single Block
//
int CmdHF14AMfURdBl(const char *Cmd){

  	UsbCommand resp;
	uint8_t blockNo = -1;	
	char cmdp = param_getchar(Cmd, 0);
	
	if (strlen(Cmd) < 1 || cmdp == 'h' || cmdp == 'H') {	
		PrintAndLog("Usage:  hf mfu rdbl <block number>");
		PrintAndLog("        sample: hfu mfu rdbl 0");
		return 0;
	}       
		
	blockNo = param_get8(Cmd, 0);

	if (blockNo > MAX_ULTRA_BLOCKS){
	   PrintAndLog("Error: Maximum number of blocks is 15 for Ultralight");
	   return 1;
	}

	UsbCommand c = {CMD_MIFAREU_READBL, {blockNo}};
	SendCommand(&c);


	if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
		uint8_t isOK = resp.arg[0] & 0xff;
		if (isOK) {
			uint8_t *data = resp.d.asBytes;
			PrintAndLog("Block: %0d (0x%02X) [ %s]", (int)blockNo, blockNo, sprint_hex(data, 4));
		}
		else {
			PrintAndLog("Failed reading block: (%02x)", isOK);
		}
	} else {
		PrintAndLog("Command execute time-out");
	}
	
	return 0;
}

//
//  Mifare Ultralight / Ultralight-C;  Read and Dump Card Contents
//
int CmdHF14AMfUDump(const char *Cmd){

	FILE *fout;
	char filename[FILE_PATH_SIZE] = {0x00};
	char * fnameptr = filename;
	
	uint8_t *lockbytes_t = NULL;
	uint8_t lockbytes[2] = {0x00};
	
	uint8_t *lockbytes_t2 = NULL;
	uint8_t lockbytes2[2] = {0x00};

	bool bit[16]  = {0x00};
	bool bit2[16] = {0x00};
	
	int i;
	uint8_t BlockNo      = 0;
	int Pages            = 16;

	bool tmplockbit		 = false;
	uint8_t isOK         = 0;
	uint8_t *data       = NULL;

	char cmdp = param_getchar(Cmd, 0);
	
	if (cmdp == 'h' || cmdp == 'H') {
		PrintAndLog("Reads all pages from Mifare Ultralight or Ultralight-C tag.");
		PrintAndLog("It saves binary dump into the file `filename.bin` or `cardUID.bin`");		
		PrintAndLog("Usage:  hf mfu dump <c> <filename w/o .bin>");
		PrintAndLog("     <c>  optional cardtype c == Ultralight-C, Defaults to Ultralight");
		PrintAndLog("     sample: hf mfu dump");
		PrintAndLog("           : hf mfu dump myfile");
		PrintAndLog("           : hf mfu dump c myfile");
		return 0;
	}

	// UL or UL-C?
	Pages = (cmdp == 'c' || cmdp == 'C') ? 44 : 16;
	
	PrintAndLog("Dumping Ultralight%s Card Data...", (Pages ==16)?"":"-C");
		
	UsbCommand c = {CMD_MIFAREU_READCARD, {BlockNo,Pages}};
	SendCommand(&c);
	UsbCommand resp;

	if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
		isOK  = resp.arg[0] & 0xff;
		if (!isOK) {                
			PrintAndLog("Command error");
			return 0;
		}
		data  = resp.d.asBytes;
	} else {
		PrintAndLog("Command execute time-out");
		return 0;
	}
		
	// Load lock bytes.
	int j = 0;
	
	lockbytes_t = data + 8;
	lockbytes[0] = lockbytes_t[2];
	lockbytes[1] = lockbytes_t[3];
	for(j = 0; j < 16; j++){
		bit[j] = lockbytes[j/8] & ( 1 <<(7-j%8));
	}		
	
	// Load bottom lockbytes if available
	if ( Pages == 44 ) {
		
		lockbytes_t2 = data + (40*4);
		lockbytes2[0] = lockbytes_t2[2];
		lockbytes2[1] = lockbytes_t2[3];
		for (j = 0; j < 16; j++) {
			bit2[j] = lockbytes2[j/8] & ( 1 <<(7-j%8));
		}
	}

	for (i = 0; i < Pages; ++i) {
		
		if ( i < 3 ) {
			PrintAndLog("Block %02x:%s ", i,sprint_hex(data + i * 4, 4));
			continue;
		}

		switch(i){
			case 3: tmplockbit = bit[4]; break;
			case 4:	tmplockbit = bit[3]; break;
			case 5:	tmplockbit = bit[2]; break;
			case 6:	tmplockbit = bit[1]; break;
			case 7:	tmplockbit = bit[0]; break;
			case 8:	tmplockbit = bit[15]; break;
			case 9: tmplockbit = bit[14]; break;
			case 10: tmplockbit = bit[13]; break;
			case 11: tmplockbit = bit[12]; break;
			case 12: tmplockbit = bit[11]; break;
			case 13: tmplockbit = bit[10]; break;
			case 14: tmplockbit = bit[9]; break;
			case 15: tmplockbit = bit[8]; break;
			case 16:
			case 17:
			case 18:
			case 19: tmplockbit = bit2[6]; break;
			case 20:
			case 21:
			case 22:
			case 23: tmplockbit = bit2[5]; break; 
			case 24:
			case 25:
			case 26:
			case 27: tmplockbit = bit2[4]; break; 		    
			case 28:
			case 29:
			case 30:
			case 31: tmplockbit = bit2[2]; break;
			case 32:
			case 33:
			case 34:
			case 35: tmplockbit = bit2[1]; break; 
			case 36:
			case 37:
			case 38:
			case 39: tmplockbit = bit2[0]; break; 
			case 40: tmplockbit = bit2[12]; break;
			case 41: tmplockbit = bit2[11]; break;
			case 42: tmplockbit = bit2[10]; break; //auth0
			case 43: tmplockbit = bit2[9]; break;  //auth1
			default: break;
		}
		PrintAndLog("Block %02x:%s [%d]", i,sprint_hex(data + i * 4, 4),tmplockbit);
	}  
	
	int len = 0;
	if ( Pages == 16 )
		len = param_getstr(Cmd,0,filename);
	else
		len = param_getstr(Cmd,1,filename);

	if (len > FILE_PATH_SIZE-5) len = FILE_PATH_SIZE-5;

	// user supplied filename?
	if (len < 1) {
	
		// UID = data 0-1-2 4-5-6-7  (skips a beat)
		sprintf(fnameptr,"%02X%02X%02X%02X%02X%02X%02X.bin",
			data[0],data[1], data[2], data[4],data[5],data[6], data[7]);

	} else {
		sprintf(fnameptr + len," .bin");
	}


	if ((fout = fopen(filename,"wb")) == NULL) { 
		PrintAndLog("Could not create file name %s", filename);
		return 1;	
	}
	fwrite( data, 1, Pages*4, fout );
	fclose(fout);
	
	PrintAndLog("Dumped %d pages, wrote %d bytes to %s", Pages, Pages*4, filename);
	return 0;
}

// Needed to Authenticate to Ultralight C tags
void rol (uint8_t *data, const size_t len){
	uint8_t first = data[0];
	for (size_t i = 0; i < len-1; i++) {
		data[i] = data[i+1];
	}
	data[len-1] = first;
}

//-------------------------------------------------------------------------------
// Ultralight C Methods
//-------------------------------------------------------------------------------

//
// Ultralight C Authentication Demo {currently uses hard-coded key}
//
int CmdHF14AMfucAuth(const char *Cmd){

	uint8_t default_keys[7][16] = {
		{ 0x42,0x52,0x45,0x41,0x4b,0x4d,0x45,0x49,0x46,0x59,0x4f,0x55,0x43,0x41,0x4e,0x21 },// 3des std key
		{ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },// all zeroes
		{ 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f },// 0x00-0x0F
		{ 0x49,0x45,0x4D,0x4B,0x41,0x45,0x52,0x42,0x21,0x4E,0x41,0x43,0x55,0x4F,0x59,0x46 },// NFC-key
		{ 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01 },// all ones
		{ 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF },// all FF
		{ 0x00,0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88,0x99,0xAA,0xBB,0xCC,0xDD,0xEE,0xFF }	// 11 22 33
	};

	char cmdp = param_getchar(Cmd, 0);
	
	uint8_t keyNo = 0;
	bool errors = false;
	//Change key to user defined one
	if (cmdp == 'k' || cmdp == 'K'){
		keyNo = param_get8(Cmd, 1);
		if(keyNo > 6) errors = true;
	}

	if (cmdp == 'h' || cmdp == 'H') {
		errors = true;
	}

	if (errors) {
		PrintAndLog("Usage:  hf mfu cauth k <key number>");
		PrintAndLog("      0 (default): 3DES standard key");
		PrintAndLog("      1 : all 0x00 key");
		PrintAndLog("      2 : 0x00-0x0F key");
		PrintAndLog("      3 : nfc key");
		PrintAndLog("      4 : all 0x01 key");
		PrintAndLog("      5 : all 0xff key");
		PrintAndLog("      6 : 0x00-0xFF key");		
		PrintAndLog("\n      sample : hf mfu cauth k");
		PrintAndLog("               : hf mfu cauth k 3");
		return 0;
	} 

	uint8_t random_a[8]     = { 1,1,1,1,1,1,1,1 };
	//uint8_t enc_random_a[8] = { 0 };
	uint8_t random_b[8]     = { 0 };
	uint8_t enc_random_b[8] = { 0 };
	uint8_t random_a_and_b[16] = { 0 };
	des3_context ctx        = { 0 };
	uint8_t *key = default_keys[keyNo];
	uint8_t blockNo = 0;
	uint32_t cuid = 0;

	//Auth1
	UsbCommand c = {CMD_MIFAREUC_AUTH1, {blockNo}};
	SendCommand(&c);
	UsbCommand resp;
	if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
		uint8_t isOK  = resp.arg[0] & 0xff;
		cuid  = resp.arg[1];
		uint8_t * data= resp.d.asBytes;

		if (isOK){
			memcpy(enc_random_b,data+1,8);
		} else {
			PrintAndLog("Auth failed");
			return 2;
		}		
	} else {
		PrintAndLog("Command execute timeout");
		return 1;
	}
	uint8_t iv[8]           = { 0 };

	PrintAndLog("     RndA  :%s",sprint_hex(random_a, 8));
	PrintAndLog("     enc(RndB):%s",sprint_hex(enc_random_b, 8));

	des3_set2key_dec(&ctx, key);

	des3_crypt_cbc(&ctx      // des3_context *ctx
		, DES_DECRYPT        // int mode
		, sizeof(random_b)   // size_t length
		, iv                 // unsigned char iv[8]
		, enc_random_b       // const unsigned char *input
		, random_b           // unsigned char *output
		);

	PrintAndLog("     RndB:%s",sprint_hex(random_b, 8));

	rol(random_b,8);
	memcpy(random_a_and_b  ,random_a,8);
	memcpy(random_a_and_b+8,random_b,8);
	
	PrintAndLog("     A+B:%s",sprint_hex(random_a_and_b, 16));

	des3_set2key_enc(&ctx, key);

	des3_crypt_cbc(&ctx          // des3_context *ctx
		, DES_ENCRYPT            // int mode
		, sizeof(random_a_and_b)   // size_t length
		, enc_random_b           // unsigned char iv[8]
		, random_a_and_b         // const unsigned char *input
		, random_a_and_b         // unsigned char *output
		);

	PrintAndLog("enc(A+B):%s",sprint_hex(random_a_and_b, 16));

	//Auth2
	UsbCommand d = {CMD_MIFAREUC_AUTH2, {cuid}};
	memcpy(d.d.asBytes,random_a_and_b, 16);
	SendCommand(&d);

	UsbCommand respb;
	if (WaitForResponseTimeout(CMD_ACK,&respb,1500)) {
		uint8_t  isOK  = respb.arg[0] & 0xff;
		uint8_t * data2= respb.d.asBytes;

		if (isOK){
			PrintAndLog("enc(RndA'):%s", sprint_hex(data2+1, 8));
			
			uint8_t foo[8] = { 0 };
			uint8_t bar[8] = { 0 };
			memcpy(foo, data2+1, 8);
			des3_set2key_dec(&ctx, key);

			des3_crypt_cbc(&ctx    // des3_context *ctx
				, DES_DECRYPT      // int mode
				, 8      // size_t length
				, enc_random_b     // unsigned char iv[8]
				, foo           // const unsigned char *input
				, bar   // unsigned char *output
			);

			PrintAndLog("--> : %s  : <-- Should be equal to our RndA",sprint_hex(bar, 8));

			
		} else {
			return 2;
		}
		
	} else {
		PrintAndLog("Command execute timeout");
		return 1;
	} 
	return 0;
}
/**
A test function to validate that the polarssl-function works the same 
was as the openssl-implementation. 
Commented out, since it requires openssl 

int CmdTestDES(const char * cmd)
{
	uint8_t key[16] = {0x00};	
	
	memcpy(key,key3_3des_data,16);  
	DES_cblock RndA, RndB;

	PrintAndLog("----------OpenSSL DES implementation----------");
	{
		uint8_t e_RndB[8] = {0x00};
		unsigned char RndARndB[16] = {0x00};

		DES_cblock iv = { 0 };
		DES_key_schedule ks1,ks2;
		DES_cblock key1,key2;

		memcpy(key,key3_3des_data,16);  
		memcpy(key1,key,8);
		memcpy(key2,key+8,8);


		DES_set_key((DES_cblock *)key1,&ks1);
		DES_set_key((DES_cblock *)key2,&ks2);

		DES_random_key(&RndA);
		PrintAndLog("     RndA:%s",sprint_hex(RndA, 8));
		PrintAndLog("     e_RndB:%s",sprint_hex(e_RndB, 8));
		//void DES_ede2_cbc_encrypt(const unsigned char *input,
		//    unsigned char *output, long length, DES_key_schedule *ks1,
		//    DES_key_schedule *ks2, DES_cblock *ivec, int enc);
		DES_ede2_cbc_encrypt(e_RndB,RndB,sizeof(e_RndB),&ks1,&ks2,&iv,0);

		PrintAndLog("     RndB:%s",sprint_hex(RndB, 8));
		rol(RndB,8);
		memcpy(RndARndB,RndA,8);
		memcpy(RndARndB+8,RndB,8);
		PrintAndLog("     RA+B:%s",sprint_hex(RndARndB, 16));
		DES_ede2_cbc_encrypt(RndARndB,RndARndB,sizeof(RndARndB),&ks1,&ks2,&e_RndB,1);
		PrintAndLog("enc(RA+B):%s",sprint_hex(RndARndB, 16));

	}
	PrintAndLog("----------PolarSSL implementation----------");
	{
		uint8_t random_a[8]     = { 0 };
		uint8_t enc_random_a[8] = { 0 };
		uint8_t random_b[8]     = { 0 };
		uint8_t enc_random_b[8] = { 0 };
		uint8_t random_a_and_b[16] = { 0 };
		des3_context ctx        = { 0 };

		memcpy(random_a, RndA,8);

		uint8_t output[8]       = { 0 };
		uint8_t iv[8]           = { 0 };

		PrintAndLog("     RndA  :%s",sprint_hex(random_a, 8));
		PrintAndLog("     e_RndB:%s",sprint_hex(enc_random_b, 8));

		des3_set2key_dec(&ctx, key);

		des3_crypt_cbc(&ctx      // des3_context *ctx
			, DES_DECRYPT        // int mode
			, sizeof(random_b)   // size_t length
			, iv                 // unsigned char iv[8]
			, enc_random_b       // const unsigned char *input
			, random_b           // unsigned char *output
			);

		PrintAndLog("     RndB:%s",sprint_hex(random_b, 8));

		rol(random_b,8);
		memcpy(random_a_and_b  ,random_a,8);
		memcpy(random_a_and_b+8,random_b,8);
		
		PrintAndLog("     RA+B:%s",sprint_hex(random_a_and_b, 16));

		des3_set2key_enc(&ctx, key);

		des3_crypt_cbc(&ctx          // des3_context *ctx
			, DES_ENCRYPT            // int mode
			, sizeof(random_a_and_b)   // size_t length
			, enc_random_b           // unsigned char iv[8]
			, random_a_and_b         // const unsigned char *input
			, random_a_and_b         // unsigned char *output
			);

		PrintAndLog("enc(RA+B):%s",sprint_hex(random_a_and_b, 16));
	}
	return 0;	
}
**/
//
// Ultralight C Read Single Block
//
int CmdHF14AMfUCRdBl(const char *Cmd)
{
	UsbCommand resp;
	bool hasPwd = FALSE;
	uint8_t blockNo = -1;
	unsigned char key[16];
	char cmdp = param_getchar(Cmd, 0);
	
	if (strlen(Cmd) < 1 || cmdp == 'h' || cmdp == 'H') {
		PrintAndLog("Usage:  hf mfu crdbl  <block number> <password>");
		PrintAndLog("");
		PrintAndLog("sample: hf mfu crdbl 0");
		PrintAndLog("        hf mfu crdbl 0 112233445566778899AABBCCDDEEFF");
		return 0;
	}       
		
	blockNo = param_get8(Cmd, 0);
	if (blockNo < 0) {
		PrintAndLog("Wrong block number");
		return 1;
	}
	
	if (blockNo > MAX_ULTRAC_BLOCKS ){
		PrintAndLog("Error: Maximum number of blocks is 47 for Ultralight-C");
		return 1;
	} 
	
	// key
	if ( strlen(Cmd) > 3){
		if (param_gethex(Cmd, 1, key, 32)) {
			PrintAndLog("Key must include %d HEX symbols", 32);
			return 1;
		} else {
			hasPwd = TRUE;
		}	
	}	

	//Read Block
	UsbCommand c = {CMD_MIFAREU_READBL, {blockNo}};
	if ( hasPwd ) {
		c.arg[1] = 1;
		memcpy(c.d.asBytes,key,16);
	}
	SendCommand(&c);

	if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
		uint8_t isOK = resp.arg[0] & 0xff;
		if (isOK) {
			uint8_t *data = resp.d.asBytes;
			PrintAndLog("Block: %0d (0x%02X) [ %s]", (int)blockNo, blockNo, sprint_hex(data, 4));
		}
		else {
			PrintAndLog("Failed reading block: (%02x)", isOK);
		}
	} else {
		PrintAndLog("Command execute time-out");
	}
	return 0;
}

//
//  Mifare Ultralight C Write Single Block
//
int CmdHF14AMfUCWrBl(const char *Cmd){
	
	uint8_t blockNo = -1;
	bool chinese_card = FALSE;
	uint8_t bldata[16] = {0x00};
	UsbCommand resp;

	char cmdp = param_getchar(Cmd, 0);
	
	if (strlen(Cmd) < 3 || cmdp == 'h' || cmdp == 'H') {	
		PrintAndLog("Usage:  hf mfu cwrbl <block number> <block data (8 hex symbols)> [w]");
		PrintAndLog("       [block number]");
		PrintAndLog("       [block data] - (8 hex symbols)");
		PrintAndLog("       [w] - Chinese magic ultralight tag");
		PrintAndLog("");
		PrintAndLog("        sample: hf mfu cwrbl 0 01020304");
		PrintAndLog("");
		return 0;
	}
	
	blockNo = param_get8(Cmd, 0);
	if (blockNo > MAX_ULTRAC_BLOCKS ){
		PrintAndLog("Error: Maximum number of blocks is 47 for Ultralight-C Cards!");
		return 1;
	}
	
	if (param_gethex(Cmd, 1, bldata, 8)) {
		PrintAndLog("Block data must include 8 HEX symbols");
		return 1;
	}
	
	if (strchr(Cmd,'w') != 0  || strchr(Cmd,'W') != 0 ) {
		chinese_card = TRUE; 
	}
	
	if ( blockNo <= 3 ) {
		if (!chinese_card){
			 PrintAndLog("Access Denied");  
		} else {
			PrintAndLog("--Special block no: 0x%02x", blockNo);
			PrintAndLog("--Data: %s", sprint_hex(bldata, 4));
			UsbCommand d = {CMD_MIFAREU_WRITEBL, {blockNo}};
			memcpy(d.d.asBytes,bldata, 4);
			SendCommand(&d);
			if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
				uint8_t isOK  = resp.arg[0] & 0xff;
				PrintAndLog("isOk:%02x", isOK);
			} else {
				PrintAndLog("Command execute timeout");
			}  
		}	
	} else {
			PrintAndLog("--Block no : 0x%02x", blockNo);
			PrintAndLog("--Data: %s", sprint_hex(bldata, 4));        	
			UsbCommand e = {CMD_MIFAREU_WRITEBL, {blockNo}};
			memcpy(e.d.asBytes,bldata, 4);
			SendCommand(&e);
			if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
				uint8_t isOK  = resp.arg[0] & 0xff;
				PrintAndLog("isOk : %02x", isOK);
			} else {
				PrintAndLog("Command execute timeout");
			}
	}
	return 0;
}

// 
// Mifare Ultralight C - Set password
//
int CmdHF14AMfucSetPwd(const char *Cmd){

	uint8_t pwd[16] = {0x00};
	
	char cmdp = param_getchar(Cmd, 0);
	
	if (strlen(Cmd) == 0  || cmdp == 'h' || cmdp == 'H') {	
		PrintAndLog("Usage:  hf mfu setpwd <password (32 hex symbols)>");
		PrintAndLog("       [password] - (32 hex symbols)");
		PrintAndLog("");
		PrintAndLog("sample: hf mfu setpwd 000102030405060708090a0b0c0d0e0f");
		PrintAndLog("");
		return 0;
	}
	
	if (param_gethex(Cmd, 0, pwd, 32)) {
		PrintAndLog("Password must include 32 HEX symbols");
		return 1;
	}
	
	UsbCommand c = {CMD_MIFAREUC_SETPWD};	
	memcpy( c.d.asBytes, pwd, 16);
	SendCommand(&c);

	UsbCommand resp;
	
	if (WaitForResponseTimeout(CMD_ACK,&resp,1500) ) {
		if ( (resp.arg[0] & 0xff) == 1)
			PrintAndLog("Ultralight-C new password: %s", sprint_hex(pwd,16));
		else{
			PrintAndLog("Failed writing at block %d", resp.arg[1] & 0xff);
			return 1;
		}
	}
	else {
		PrintAndLog("command execution time out");
		return 1;
	}
	
	return 0;
}

//
// Mifare Ultraligh - Set UID
//
int CmdHF14AMfucSetUid(const char *Cmd){

	UsbCommand c;
	UsbCommand resp;
	uint8_t uid[7] = {0x00};
	char cmdp = param_getchar(Cmd, 0);
	
	if (strlen(Cmd) == 0  || cmdp == 'h' || cmdp == 'H') {	
		PrintAndLog("Usage:  hf mfu setuid <uid (14 hex symbols)>");
		PrintAndLog("       [uid] - (14 hex symbols)");
		PrintAndLog("\nThis only works for Magic Ultralight tags.");
		PrintAndLog("");
		PrintAndLog("sample: hf mfu setuid 11223344556677");
		PrintAndLog("");
		return 0;
	}
	
	if (param_gethex(Cmd, 0, uid, 14)) {
		PrintAndLog("UID must include 14 HEX symbols");
		return 1;
	}

	// read block2. 
	c.cmd = CMD_MIFAREU_READBL;
	c.arg[0] = 2;
	SendCommand(&c);
	if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
		PrintAndLog("Command execute timeout");
		return 2;
	}
	
	// save old block2.
	uint8_t oldblock2[4] = {0x00};
	memcpy(resp.d.asBytes, oldblock2, 4);
	
	// block 0.
	c.cmd = CMD_MIFAREU_WRITEBL;
	c.arg[0] = 0;
	c.d.asBytes[0] = uid[0];
	c.d.asBytes[1] = uid[1];
	c.d.asBytes[2] = uid[2];
	c.d.asBytes[3] =  0x88 ^ uid[0] ^ uid[1] ^ uid[2];
	SendCommand(&c);
	if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
		PrintAndLog("Command execute timeout");
		return 3;
	}
	
	// block 1.
	c.arg[0] = 1;
	c.d.asBytes[0] = uid[3];
	c.d.asBytes[1] = uid[4];
	c.d.asBytes[2] = uid[5];
	c.d.asBytes[3] = uid[6];
	SendCommand(&c);
	if (!WaitForResponseTimeout(CMD_ACK,&resp,1500) ) {
		PrintAndLog("Command execute timeout");
		return 4;
	}

	// block 2.
	c.arg[0] = 2;
	c.d.asBytes[0] = uid[3] ^ uid[4] ^ uid[5] ^ uid[6];
	c.d.asBytes[1] = oldblock2[1];
	c.d.asBytes[2] = oldblock2[2];
	c.d.asBytes[3] = oldblock2[3];
	SendCommand(&c);
	if (!WaitForResponseTimeout(CMD_ACK,&resp,1500) ) {
		PrintAndLog("Command execute timeout");
		return 5;
	}
	
	return 0;
}

int CmdHF14AMfuGenDiverseKeys(const char *Cmd){
	
	uint8_t iv[8] = { 0x00 };
	uint8_t block = 0x07;
	
	// UL-EV1
	//04 57 b6 e2 05 3f 80 UID
	//4a f8 4b 19   PWD
	uint8_t uid[] = { 0xF4,0xEA, 0x54, 0x8E };
	uint8_t mifarekeyA[] = { 0xA0,0xA1,0xA2,0xA3,0xA4,0xA5 };
	uint8_t mifarekeyB[] = { 0xB0,0xB1,0xB2,0xB3,0xB4,0xB5 };
	uint8_t dkeyA[8] = { 0x00 };
	uint8_t dkeyB[8] = { 0x00 };
	
	uint8_t masterkey[] = { 0x00,0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88,0x99,0xaa,0xbb,0xcc,0xdd,0xee,0xff };
	
	uint8_t mix[8] = { 0x00 };
	uint8_t divkey[8] = { 0x00 };
	
	memcpy(mix, mifarekeyA, 4);
	
	mix[4] = mifarekeyA[4] ^ uid[0];
	mix[5] = mifarekeyA[5] ^ uid[1];
	mix[6] = block ^ uid[2];
	mix[7] = uid[3];
	
	des3_context ctx = { 0x00 };
	des3_set2key_enc(&ctx, masterkey);

	des3_crypt_cbc(&ctx  // des3_context
		, DES_ENCRYPT    // int mode
		, sizeof(mix)    // length
		, iv             // iv[8]
		, mix            // input
		, divkey         // output
		);

	PrintAndLog("3DES version");
	PrintAndLog("Masterkey    :\t %s", sprint_hex(masterkey,sizeof(masterkey)));
	PrintAndLog("UID          :\t %s", sprint_hex(uid, sizeof(uid)));
	PrintAndLog("Sector       :\t %0d", block);
	PrintAndLog("Mifare key   :\t %s", sprint_hex(mifarekeyA, sizeof(mifarekeyA)));
	PrintAndLog("Message      :\t %s", sprint_hex(mix, sizeof(mix)));
	PrintAndLog("Diversified key: %s", sprint_hex(divkey+1, 6));
		
	PrintAndLog("\n DES version");
	
	for (int i=0; i < sizeof(mifarekeyA); ++i){
		dkeyA[i] = (mifarekeyA[i] << 1) & 0xff;
		dkeyA[6] |=  ((mifarekeyA[i] >> 7) & 1) << (i+1);
	}
	
	for (int i=0; i < sizeof(mifarekeyB); ++i){
		dkeyB[1] |=  ((mifarekeyB[i] >> 7) & 1) << (i+1);
		dkeyB[2+i] = (mifarekeyB[i] << 1) & 0xff;
	}
	
	uint8_t zeros[8] = {0x00};
	uint8_t newpwd[8] = {0x00};
	uint8_t dmkey[24] = {0x00};
	memcpy(dmkey, dkeyA, 8);
	memcpy(dmkey+8, dkeyB, 8);
	memcpy(dmkey+16, dkeyA, 8);
	memset(iv, 0x00, 8);
	
	des3_set3key_enc(&ctx, dmkey);

	des3_crypt_cbc(&ctx  // des3_context
		, DES_ENCRYPT    // int mode
		, sizeof(newpwd) // length
		, iv             // iv[8]
		, zeros         // input
		, newpwd         // output
		);
	
	PrintAndLog("Mifare dkeyA :\t %s", sprint_hex(dkeyA, sizeof(dkeyA)));
	PrintAndLog("Mifare dkeyB :\t %s", sprint_hex(dkeyB, sizeof(dkeyB)));
	PrintAndLog("Mifare ABA   :\t %s", sprint_hex(dmkey, sizeof(dmkey)));
	PrintAndLog("Mifare Pwd   :\t %s", sprint_hex(newpwd, sizeof(newpwd)));
	
	return 0;
}

// static uint8_t * diversify_key(uint8_t * key){
	
 // for(int i=0; i<16; i++){
   // if(i<=6) key[i]^=cuid[i];
   // if(i>6) key[i]^=cuid[i%7];
 // }
 // return key;
// }

// static void GenerateUIDe( uint8_t *uid, uint8_t len){
	// for (int i=0; i<len; ++i){
			
	// }
	// return;
// }

//------------------------------------
// Menu Stuff
//------------------------------------
static command_t CommandTable[] =
{
	{"help",	CmdHelp,			1,"This help"},
	{"dbg",		CmdHF14AMfDbg,		0,"Set default debug mode"},
	{"info",	CmdHF14AMfUInfo,	0,"Taginfo"},
	{"dump",	CmdHF14AMfUDump,	0,"Dump MIFARE Ultralight / Ultralight-C tag to binary file"},
	{"rdbl",	CmdHF14AMfURdBl,	0,"Read block  - MIFARE Ultralight"},
	{"wrbl",	CmdHF14AMfUWrBl,	0,"Write block - MIFARE Ultralight"},    
	{"crdbl",	CmdHF14AMfUCRdBl,	0,"Read block  - MIFARE Ultralight C"},
	{"cwrbl",	CmdHF14AMfUCWrBl,	0,"Write block - MIFARE Ultralight C"},
	{"cauth",	CmdHF14AMfucAuth,	0,"Ultralight C Authentication"},
	//{"testdes", CmdTestDES ,        1, "Test DES"},
	{"setpwd", CmdHF14AMfucSetPwd , 1, "Set 3des password [Ultralight-C only]"},
	{"setuid", CmdHF14AMfucSetUid , 1, "Set UID"},
	{"gen", CmdHF14AMfuGenDiverseKeys , 1, "Generate 3des mifare diversified keys"},
	{NULL, NULL, 0, NULL}
};

int CmdHFMFUltra(const char *Cmd){
	WaitForResponseTimeout(CMD_ACK,NULL,100);
	CmdsParse(CommandTable, Cmd);
	return 0;
}

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