X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/20f9a2a1d54952ed15066c93490f0e8fb0d43b67..refs/pull/8/head:/armsrc/mifareutil.c

diff --git a/armsrc/mifareutil.c b/armsrc/mifareutil.c
index ede1cbc9..b847043b 100644
--- a/armsrc/mifareutil.c
+++ b/armsrc/mifareutil.c
@@ -1,12 +1,12 @@
 //-----------------------------------------------------------------------------
-// Merlok, May 2011
-// Many authors, that makes it possible
+// Merlok, May 2011, 2012
+// Many authors, whom made it possible
 //
 // 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.
 //-----------------------------------------------------------------------------
-// code for work with mifare cards.
+// Work with mifare cards.
 //-----------------------------------------------------------------------------
 
 #include "proxmark3.h"
@@ -19,13 +19,98 @@
 #include "crapto1.h"
 #include "mifareutil.h"
 
+int MF_DBGLEVEL = MF_DBG_ALL;
+
+// memory management
 uint8_t* mifare_get_bigbufptr(void) {
-	return (((uint8_t *)BigBuf) + 3560);	// was 3560 - tied to other size changes
+	return (((uint8_t *)BigBuf) + MIFARE_BUFF_OFFSET);	// was 3560 - tied to other size changes
+}
+uint8_t* eml_get_bigbufptr_sendbuf(void) {
+	return (((uint8_t *)BigBuf) + RECV_CMD_OFFSET);	
+}
+uint8_t* eml_get_bigbufptr_recbuf(void) {
+	return (((uint8_t *)BigBuf) + MIFARE_BUFF_OFFSET);
+}
+uint8_t* eml_get_bigbufptr_cardmem(void) {
+	return (((uint8_t *)BigBuf) + CARD_MEMORY);
+}
+
+// crypto1 helpers
+void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len){
+	uint8_t	bt = 0;
+	int i;
+	
+	if (len != 1) {
+		for (i = 0; i < len; i++)
+			data[i] = crypto1_byte(pcs, 0x00, 0) ^ data[i];
+	} else {
+		bt = 0;
+		for (i = 0; i < 4; i++)
+			bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data[0], i)) << i;
+				
+		data[0] = bt;
+	}
+	return;
+}
+
+void mf_crypto1_encrypt(struct Crypto1State *pcs, uint8_t *data, int len, uint32_t *par) {
+	uint8_t bt = 0;
+	int i;
+	uint32_t mltpl = 1 << (len - 1); // for len=18 it=0x20000
+	*par = 0;
+	for (i = 0; i < len; i++) {
+		bt = data[i];
+		data[i] = crypto1_byte(pcs, 0x00, 0) ^ data[i];
+		*par = (*par >> 1) | ( ((filter(pcs->odd) ^ oddparity(bt)) & 0x01) * mltpl );
+	}	
+	return;
 }
 
-int mifare_sendcmd_short(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t* answer)
+uint8_t mf_crypto1_encrypt4bit(struct Crypto1State *pcs, uint8_t data) {
+	uint8_t bt = 0;
+	int i;
+
+	for (i = 0; i < 4; i++)
+		bt |= (crypto1_bit(pcs, 0, 0) ^ BIT(data, i)) << i;
+		
+	return bt;
+}
+
+// send commands
+int mifare_sendcmd_short(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t* answer, uint32_t *timing)
 {
-	uint8_t dcmd[4], ecmd[4];
+	return mifare_sendcmd_shortex(pcs, crypted, cmd, data, answer, NULL, timing);
+}
+
+int mifare_sendcmd_short_special(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t* data, uint8_t* answer, uint8_t *timing)
+{
+        uint8_t dcmd[8];//, ecmd[4];
+        //uint32_t par=0;
+
+        dcmd[0] = cmd;
+        dcmd[1] = data[0];
+	dcmd[2] = data[1];
+	dcmd[3] = data[2];
+	dcmd[4] = data[3];
+	dcmd[5] = data[4];
+	AppendCrc14443a(dcmd, 6);
+	//Dbprintf("Data command: %02x", dcmd[0]);
+	//Dbprintf("Data R: %02x %02x %02x %02x %02x %02x %02x", dcmd[1],dcmd[2],dcmd[3],dcmd[4],dcmd[5],dcmd[6],dcmd[7]);
+
+        //memcpy(ecmd, dcmd, sizeof(dcmd));
+	ReaderTransmit(dcmd, sizeof(dcmd), NULL);
+	int len = ReaderReceive(answer);
+	if(!len)
+	{
+                if (MF_DBGLEVEL >= 1)   Dbprintf("Authentication failed. Card timeout.");
+                return 2;
+        }
+	return len;
+}
+
+int mifare_sendcmd_shortex(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd, uint8_t data, uint8_t* answer, uint32_t * parptr, uint32_t *timing)
+{
+	uint8_t dcmd[4], ecmd[4];
 	uint32_t pos, par, res;
 
 	dcmd[0] = cmd;
@@ -42,15 +127,17 @@ int mifare_sendcmd_short(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd,
 			par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(dcmd[pos])) & 0x01) * 0x08 );
 		}	
 
-		ReaderTransmitPar(ecmd, sizeof(ecmd), par);
+		ReaderTransmitPar(ecmd, sizeof(ecmd), par, timing);
 
 	} else {
-		ReaderTransmit(dcmd, sizeof(dcmd));
+		ReaderTransmit(dcmd, sizeof(dcmd), timing);
 	}
 
-	int len = ReaderReceive(answer);
+	int len = ReaderReceivePar(answer, &par);
+	
+	if (parptr) *parptr = par;
 
-	if (crypted) {
+	if (crypted == CRYPT_ALL) {
 		if (len == 1) {
 			res = 0;
 			for (pos = 0; pos < 4; pos++)
@@ -69,23 +156,29 @@ int mifare_sendcmd_short(struct Crypto1State *pcs, uint8_t crypted, uint8_t cmd,
 	return len;
 }
 
+// mifare commands
 int mifare_classic_auth(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t keyType, uint64_t ui64Key, uint64_t isNested) 
+{
+	return mifare_classic_authex(pcs, uid, blockNo, keyType, ui64Key, isNested, NULL, NULL);
+}
+
+int mifare_classic_authex(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t keyType, uint64_t ui64Key, uint64_t isNested, uint32_t * ntptr, uint32_t *timing) 
 {
 	// variables
-  int len;	
+	int len;	
 	uint32_t pos;
 	uint8_t tmp4[4];
-  byte_t par = 0;
-  byte_t ar[4];
+	byte_t par = 0;
+	byte_t ar[4];
 	uint32_t nt, ntpp; // Supplied tag nonce
 	
 	uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
-  uint8_t* receivedAnswer = mifare_get_bigbufptr();
+	uint8_t* receivedAnswer = mifare_get_bigbufptr();
 
-  // Transmit MIFARE_CLASSIC_AUTH
-	len = mifare_sendcmd_short(pcs, isNested, 0x60 + (keyType & 0x01), blockNo, receivedAnswer);
-//	Dbprintf("rand nonce len: %x", len);  
-  if (len != 4) return 1;
+	// Transmit MIFARE_CLASSIC_AUTH
+	len = mifare_sendcmd_short(pcs, isNested, 0x60 + (keyType & 0x01), blockNo, receivedAnswer, timing);
+	if (MF_DBGLEVEL >= 4)	Dbprintf("rand nonce len: %x", len);  
+	if (len != 4) return 1;
 	
 	ar[0] = 0x55;
 	ar[1] = 0x41;
@@ -94,50 +187,65 @@ int mifare_classic_auth(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo,
 	
 	// Save the tag nonce (nt)
 	nt = bytes_to_num(receivedAnswer, 4);
-	Dbprintf("uid: %x nt: %x", uid, nt);  
 
 	//  ----------------------------- crypto1 create
-  // Init cipher with key
+	if (isNested)
+		crypto1_destroy(pcs);
+
+	// Init cipher with key
 	crypto1_create(pcs, ui64Key);
 
-  // Load (plain) uid^nt into the cipher
-	crypto1_word(pcs, nt ^ uid, 0);
+	if (isNested == AUTH_NESTED) {
+		// decrypt nt with help of new key 
+		nt = crypto1_word(pcs, nt ^ uid, 1) ^ nt;
+	} else {
+		// Load (plain) uid^nt into the cipher
+		crypto1_word(pcs, nt ^ uid, 0);
+	}
+
+	// some statistic
+	if (!ntptr && (MF_DBGLEVEL >= 3))
+		Dbprintf("auth uid: %08x nt: %08x", uid, nt);  
+	
+	// save Nt
+	if (ntptr)
+		*ntptr = nt;
 
 	par = 0;
-  // Generate (encrypted) nr+parity by loading it into the cipher (Nr)
-  for (pos = 0; pos < 4; pos++)
-  {
-    mf_nr_ar[pos] = crypto1_byte(pcs, ar[pos], 0) ^ ar[pos];
+	// Generate (encrypted) nr+parity by loading it into the cipher (Nr)
+	for (pos = 0; pos < 4; pos++)
+	{
+		mf_nr_ar[pos] = crypto1_byte(pcs, ar[pos], 0) ^ ar[pos];
 		par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(ar[pos])) & 0x01) * 0x80 );
-  }	
+	}	
 		
-  // Skip 32 bits in pseudo random generator
-  nt = prng_successor(nt,32);
+	// Skip 32 bits in pseudo random generator
+	nt = prng_successor(nt,32);
 
 	//  ar+parity
-  for (pos = 4; pos < 8; pos++)
-  {
+	for (pos = 4; pos < 8; pos++)
+	{
 		nt = prng_successor(nt,8);
-    mf_nr_ar[pos] = crypto1_byte(pcs,0x00,0) ^ (nt & 0xff);
+		mf_nr_ar[pos] = crypto1_byte(pcs,0x00,0) ^ (nt & 0xff);
 		par = (par >> 1)| ( ((filter(pcs->odd) ^ oddparity(nt & 0xff)) & 0x01) * 0x80 );
-  }	
+	}	
 		
-  // Transmit reader nonce and reader answer
-  ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par);
+	// Transmit reader nonce and reader answer
+	ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par, NULL);
 
-  // Receive 4 bit answer
+	// Receive 4 bit answer
 	len = ReaderReceive(receivedAnswer);
-  if (!len)
-  {
-    Dbprintf("Authentication failed. Card timeout.");
+	if (!len)
+	{
+		if (MF_DBGLEVEL >= 1)	Dbprintf("Authentication failed. Card timeout.");
 		return 2;
-  }
+	}
 	
-  memcpy(tmp4, receivedAnswer, 4);
+	memcpy(tmp4, receivedAnswer, 4);
 	ntpp = prng_successor(nt, 32) ^ crypto1_word(pcs, 0,0);
 	
 	if (ntpp != bytes_to_num(tmp4, 4)) {
-    Dbprintf("Authentication failed. Error card response.");
+		if (MF_DBGLEVEL >= 1)	Dbprintf("Authentication failed. Error card response.");
 		return 3;
 	}
 
@@ -147,49 +255,80 @@ int mifare_classic_auth(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo,
 int mifare_classic_readblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData) 
 {
 	// variables
-  int len;	
+	int len;	
 	uint8_t	bt[2];
 	
-  uint8_t* receivedAnswer = mifare_get_bigbufptr();
+	uint8_t* receivedAnswer = mifare_get_bigbufptr();
 	
-  // command MIFARE_CLASSIC_READBLOCK
-	len = mifare_sendcmd_short(pcs, 1, 0x30, blockNo, receivedAnswer);
+	// command MIFARE_CLASSIC_READBLOCK
+	len = mifare_sendcmd_short(pcs, 1, 0x30, blockNo, receivedAnswer, NULL);
 	if (len == 1) {
-		Dbprintf("Cmd Error: %02x", receivedAnswer[0]);  
+		if (MF_DBGLEVEL >= 1)	Dbprintf("Cmd Error: %02x", receivedAnswer[0]);  
 		return 1;
 	}
 	if (len != 18) {
-		Dbprintf("Cmd Error: card timeout. len: %x", len);  
+		if (MF_DBGLEVEL >= 1)	Dbprintf("Cmd Error: card timeout. len: %x", len);  
 		return 2;
 	}
 
 	memcpy(bt, receivedAnswer + 16, 2);
-  AppendCrc14443a(receivedAnswer, 16);
+	AppendCrc14443a(receivedAnswer, 16);
 	if (bt[0] != receivedAnswer[16] || bt[1] != receivedAnswer[17]) {
-		Dbprintf("Cmd CRC response error.");  
+		if (MF_DBGLEVEL >= 1)	Dbprintf("Cmd CRC response error.");  
 		return 3;
 	}
 	
 	memcpy(blockData, receivedAnswer, 16);
-	return 0;
-}
-
-int mifare_classic_writeblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData) 
-{
-	// variables
-  int len, i;	
+	return 0;
+}
+
+int mifare_ultra_readblock(uint32_t uid, uint8_t blockNo, uint8_t *blockData)
+{
+	// variables
+	int len;
+	uint8_t	bt[2];
+	
+	uint8_t* receivedAnswer = mifare_get_bigbufptr();
+	
+	// command MIFARE_CLASSIC_READBLOCK
+	len = mifare_sendcmd_short(NULL, 1, 0x30, blockNo, receivedAnswer,NULL);
+	if (len == 1) {
+		if (MF_DBGLEVEL >= 1)	Dbprintf("Cmd Error: %02x", receivedAnswer[0]);
+		return 1;
+	}
+	if (len != 18) {
+		if (MF_DBGLEVEL >= 1)	Dbprintf("Cmd Error: card timeout. len: %x", len);
+		return 2;
+	}
+    
+	memcpy(bt, receivedAnswer + 16, 2);
+	AppendCrc14443a(receivedAnswer, 16);
+	if (bt[0] != receivedAnswer[16] || bt[1] != receivedAnswer[17]) {
+		if (MF_DBGLEVEL >= 1)	Dbprintf("Cmd CRC response error.");
+		return 3;
+	}
+	
+	memcpy(blockData, receivedAnswer, 14);
+	return 0;
+}
+
+
+int mifare_classic_writeblock(struct Crypto1State *pcs, uint32_t uid, uint8_t blockNo, uint8_t *blockData) 
+{
+	// variables
+	int len, i;	
 	uint32_t pos;
-  uint32_t par = 0;
-  byte_t res;
+	uint32_t par = 0;
+	byte_t res;
 	
 	uint8_t d_block[18], d_block_enc[18];
-  uint8_t* receivedAnswer = mifare_get_bigbufptr();
+	uint8_t* receivedAnswer = mifare_get_bigbufptr();
 	
-  // command MIFARE_CLASSIC_WRITEBLOCK
-	len = mifare_sendcmd_short(pcs, 1, 0xA0, blockNo, receivedAnswer);
+	// command MIFARE_CLASSIC_WRITEBLOCK
+	len = mifare_sendcmd_short(pcs, 1, 0xA0, blockNo, receivedAnswer, NULL);
 
 	if ((len != 1) || (receivedAnswer[0] != 0x0A)) {   //  0x0a - ACK
-		Dbprintf("Cmd Error: %02x", receivedAnswer[0]);  
+		if (MF_DBGLEVEL >= 1)	Dbprintf("Cmd Error: %02x", receivedAnswer[0]);  
 		return 1;
 	}
 	
@@ -198,15 +337,15 @@ int mifare_classic_writeblock(struct Crypto1State *pcs, uint32_t uid, uint8_t bl
 	
 	// crypto
 	par = 0;
-  for (pos = 0; pos < 18; pos++)
-  {
-    d_block_enc[pos] = crypto1_byte(pcs, 0x00, 0) ^ d_block[pos];
+	for (pos = 0; pos < 18; pos++)
+	{
+		d_block_enc[pos] = crypto1_byte(pcs, 0x00, 0) ^ d_block[pos];
 		par = (par >> 1) | ( ((filter(pcs->odd) ^ oddparity(d_block[pos])) & 0x01) * 0x20000 );
-  }	
+	}	
 
-  ReaderTransmitPar(d_block_enc, sizeof(d_block_enc), par);
+	ReaderTransmitPar(d_block_enc, sizeof(d_block_enc), par, NULL);
 
-  // Receive the response
+	// Receive the response
 	len = ReaderReceive(receivedAnswer);	
 
 	res = 0;
@@ -214,26 +353,194 @@ int mifare_classic_writeblock(struct Crypto1State *pcs, uint32_t uid, uint8_t bl
 		res |= (crypto1_bit(pcs, 0, 0) ^ BIT(receivedAnswer[0], i)) << i;
 
 	if ((len != 1) || (res != 0x0A)) {
-		Dbprintf("Cmd send data2 Error: %02x", res);  
+		if (MF_DBGLEVEL >= 1)	Dbprintf("Cmd send data2 Error: %02x", res);  
 		return 2;
 	}
 	
-	return 0;
+	return 0;
+}
+
+int mifare_ultra_writeblock(uint32_t uid, uint8_t blockNo, uint8_t *blockData) 
+{
+        // variables
+        int len;     
+        uint32_t par = 0;
+        
+        uint8_t d_block[18];
+        uint8_t* receivedAnswer = mifare_get_bigbufptr();
+        
+        // command MIFARE_CLASSIC_WRITEBLOCK
+        len = mifare_sendcmd_short(NULL, 1, 0xA0, blockNo, receivedAnswer,NULL);
+
+        if ((len != 1) || (receivedAnswer[0] != 0x0A)) {   //  0x0a - ACK
+                if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Addr Error: %02x", receivedAnswer[0]);  
+                return 1;
+        }
+
+	memset(d_block,'\0',18);
+	memcpy(d_block, blockData, 16);
+        AppendCrc14443a(d_block, 16);
+
+	ReaderTransmitPar(d_block, sizeof(d_block), par, NULL);
+
+        // Receive the response
+        len = ReaderReceive(receivedAnswer);    
+
+	if ((len != 1) || (receivedAnswer[0] != 0x0A)) {   //  0x0a - ACK
+                if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Data Error: %02x %d", receivedAnswer[0],len);
+                return 2;
+        }        
+
+        return 0;
+} 
+
+int mifare_ultra_special_writeblock(uint32_t uid, uint8_t blockNo, uint8_t *blockData)
+{
+        // variables
+        int len;
+        //uint32_t par = 0;
+
+        uint8_t d_block[8];
+        uint8_t* receivedAnswer = mifare_get_bigbufptr();
+
+        // command MIFARE_CLASSIC_WRITEBLOCK
+	memset(d_block,'\0',8);
+	d_block[0]= blockNo;
+	memcpy(d_block+1,blockData,4);
+	AppendCrc14443a(d_block, 6);
+
+	//i know the data send here is correct
+        len = mifare_sendcmd_short_special(NULL, 1, 0xA2, d_block, receivedAnswer,NULL);
+
+        if (receivedAnswer[0] != 0x0A) {   //  0x0a - ACK
+                if (MF_DBGLEVEL >= 1)   Dbprintf("Cmd Send Error: %02x %d", receivedAnswer[0],len);
+                return 1;
+        }
+        return 0;
+}
+
+int mifare_classic_halt(struct Crypto1State *pcs, uint32_t uid) 
+{
+	// variables
+	int len;	
+	
+	// Mifare HALT
+	uint8_t* receivedAnswer = mifare_get_bigbufptr();
+
+	len = mifare_sendcmd_short(pcs, pcs == NULL ? 0:1, 0x50, 0x00, receivedAnswer, NULL);
+	if (len != 0) {
+		if (MF_DBGLEVEL >= 1)	Dbprintf("halt error. response len: %x", len);  
+		return 1;
+	}
+
+	return 0;
+}
+
+int mifare_ultra_halt(uint32_t uid)
+{
+	// variables
+	int len;
+	
+	// Mifare HALT
+	uint8_t* receivedAnswer = mifare_get_bigbufptr();
+    
+	len = mifare_sendcmd_short(NULL, 1, 0x50, 0x00, receivedAnswer, NULL);
+	if (len != 0) {
+		if (MF_DBGLEVEL >= 1)	Dbprintf("halt error. response len: %x", len);
+		return 1;
+	}
+    
+	return 0;
+}
+
+// work with emulator memory
+void emlSetMem(uint8_t *data, int blockNum, int blocksCount) {
+	uint8_t* emCARD = eml_get_bigbufptr_cardmem();
+	
+	memcpy(emCARD + blockNum * 16, data, blocksCount * 16);
 }
 
-int mifare_classic_halt(struct Crypto1State *pcs, uint32_t uid) 
-{
-	// variables
-  int len;	
+void emlGetMem(uint8_t *data, int blockNum, int blocksCount) {
+	uint8_t* emCARD = eml_get_bigbufptr_cardmem();
 	
-	// Mifare HALT
-  uint8_t* receivedAnswer = mifare_get_bigbufptr();
+	memcpy(data, emCARD + blockNum * 16, blocksCount * 16);
+}
+
+void emlGetMemBt(uint8_t *data, int bytePtr, int byteCount) {
+	uint8_t* emCARD = eml_get_bigbufptr_cardmem();
+	
+	memcpy(data, emCARD + bytePtr, byteCount);
+}
+
+int emlCheckValBl(int blockNum) {
+	uint8_t* emCARD = eml_get_bigbufptr_cardmem();
+	uint8_t* data = emCARD + blockNum * 16;
 
-	len = mifare_sendcmd_short(pcs, 1, 0x50, 0x00, receivedAnswer);
-  if (len != 0) {
-		Dbprintf("halt error. response len: %x", len);  
+	if ((data[0] != (data[4] ^ 0xff)) || (data[0] != data[8]) ||
+			(data[1] != (data[5] ^ 0xff)) || (data[1] != data[9]) ||
+			(data[2] != (data[6] ^ 0xff)) || (data[2] != data[10]) ||
+			(data[3] != (data[7] ^ 0xff)) || (data[3] != data[11]) ||
+			(data[12] != (data[13] ^ 0xff)) || (data[12] != data[14]) ||
+			(data[12] != (data[15] ^ 0xff))
+		 ) 
+		return 1;
+	return 0;
+}
+
+int emlGetValBl(uint32_t *blReg, uint8_t *blBlock, int blockNum) {
+	uint8_t* emCARD = eml_get_bigbufptr_cardmem();
+	uint8_t* data = emCARD + blockNum * 16;
+	
+	if (emlCheckValBl(blockNum)) {
 		return 1;
 	}
+	
+	memcpy(blReg, data, 4);
+	*blBlock = data[12];
+	
+	return 0;
+}
 
+int emlSetValBl(uint32_t blReg, uint8_t blBlock, int blockNum) {
+	uint8_t* emCARD = eml_get_bigbufptr_cardmem();
+	uint8_t* data = emCARD + blockNum * 16;
+	
+	memcpy(data + 0, &blReg, 4);
+	memcpy(data + 8, &blReg, 4);
+	blReg = blReg ^ 0xffffffff;
+	memcpy(data + 4, &blReg, 4);
+	
+	data[12] = blBlock;
+	data[13] = blBlock ^ 0xff;
+	data[14] = blBlock;
+	data[15] = blBlock ^ 0xff;
+	
 	return 0;
 }
+
+uint64_t emlGetKey(int sectorNum, int keyType) {
+	uint8_t key[6];
+	uint8_t* emCARD = eml_get_bigbufptr_cardmem();
+	
+	memcpy(key, emCARD + 3 * 16 + sectorNum * 4 * 16 + keyType * 10, 6);
+	return bytes_to_num(key, 6);
+}
+
+void emlClearMem(void) {
+	int b;
+	
+	const uint8_t trailer[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x07, 0x80, 0x69, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+	const uint8_t uid[]   =   {0xe6, 0x84, 0x87, 0xf3, 0x16, 0x88, 0x04, 0x00, 0x46, 0x8e, 0x45, 0x55, 0x4d, 0x70, 0x41, 0x04};
+	uint8_t* emCARD = eml_get_bigbufptr_cardmem();
+	
+	memset(emCARD, 0, CARD_MEMORY_LEN);
+	
+	// fill sectors trailer data
+	for(b = 3; b < 256; b<127?(b+=4):(b+=16)) {
+		emlSetMem((uint8_t *)trailer, b , 1);
+	}	
+
+	// uid
+	emlSetMem((uint8_t *)uid, 0, 1);
+	return;
+}