X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/7781a65656e334a44ded56f6378a167a30afa2e5..8e726f6c37dcfe0513bc2c1e911a27ddeb7fd01e:/client/cmdhficlass.c

diff --git a/client/cmdhficlass.c b/client/cmdhficlass.c
index dd0a8e2f..31f7ba97 100644
--- a/client/cmdhficlass.c
+++ b/client/cmdhficlass.c
@@ -29,16 +29,17 @@
 #include "loclass/ikeys.h"
 #include "loclass/elite_crack.h"
 #include "loclass/fileutils.h"
+#include "protocols.h"
 
 static int CmdHelp(const char *Cmd);
 
 int xorbits_8(uint8_t val)
 {
-    uint8_t res = val ^ (val >> 1); //1st pass
-    res = res ^ (res >> 1); 		// 2nd pass
-    res = res ^ (res >> 2); 		// 3rd pass
-    res = res ^ (res >> 4); 			// 4th pass
-    return res & 1;
+	uint8_t res = val ^ (val >> 1); //1st pass
+	res = res ^ (res >> 1); 		// 2nd pass
+	res = res ^ (res >> 2); 		// 3rd pass
+	res = res ^ (res >> 4); 			// 4th pass
+	return res & 1;
 }
 
 int CmdHFiClassList(const char *Cmd)
@@ -49,77 +50,73 @@ int CmdHFiClassList(const char *Cmd)
 
 int CmdHFiClassSnoop(const char *Cmd)
 {
-  UsbCommand c = {CMD_SNOOP_ICLASS};
-  SendCommand(&c);
-  return 0;
+	UsbCommand c = {CMD_SNOOP_ICLASS};
+	SendCommand(&c);
+	return 0;
 }
-#define NUM_CSNS 15
-int CmdHFiClassSim(const char *Cmd)
+int usage_hf_iclass_sim()
 {
-  uint8_t simType = 0;
-  uint8_t CSN[8] = {0, 0, 0, 0, 0, 0, 0, 0};
-
-  if (strlen(Cmd)<1) {
-	PrintAndLog("Usage:  hf iclass sim [0 <CSN>] | x");
+	PrintAndLog("Usage:  hf iclass sim <option> [CSN]");
 	PrintAndLog("        options");
 	PrintAndLog("                0 <CSN> simulate the given CSN");
 	PrintAndLog("                1       simulate default CSN");
-	PrintAndLog("                2       iterate CSNs, gather MACs");
-	PrintAndLog("        sample: hf iclass sim 0 031FEC8AF7FF12E0");
-	PrintAndLog("        sample: hf iclass sim 2");
+	PrintAndLog("                2       Reader-attack, gather reader responses to extract elite key");
+	PrintAndLog("                3       Full simulation using emulator memory (see 'hf iclass eload')");
+	PrintAndLog("        example: hf iclass sim 0 031FEC8AF7FF12E0");
+	PrintAndLog("        example: hf iclass sim 2");
+	PrintAndLog("        example: hf iclass eload 'tagdump.bin'");
+	PrintAndLog("                 hf iclass sim 3");
 	return 0;
-  }	
-
-  simType = param_get8(Cmd, 0);
-
-  if(simType == 0)
-  {
-	  if (param_gethex(Cmd, 1, CSN, 16)) {
-		  PrintAndLog("A CSN should consist of 16 HEX symbols");
-		  return 1;
-	  }
-	  PrintAndLog("--simtype:%02x csn:%s", simType, sprint_hex(CSN, 8));
-
-  }
-  if(simType > 2)
-  {
-	  PrintAndLog("Undefined simptype %d", simType);
-	  return 1;
-  }
-  uint8_t numberOfCSNs=0;
+}
+
+#define NUM_CSNS 15
+int CmdHFiClassSim(const char *Cmd)
+{
+	uint8_t simType = 0;
+	uint8_t CSN[8] = {0, 0, 0, 0, 0, 0, 0, 0};
+
+	if (strlen(Cmd)<1) {
+		return usage_hf_iclass_sim();
+	}
+	simType = param_get8ex(Cmd, 0, 0, 10);
+
+	if(simType == 0)
+	{
+		if (param_gethex(Cmd, 1, CSN, 16)) {
+			PrintAndLog("A CSN should consist of 16 HEX symbols");
+			return usage_hf_iclass_sim();
+		}
+
+		PrintAndLog("--simtype:%02x csn:%s", simType, sprint_hex(CSN, 8));
+	}
+	if(simType > 3)
+	{
+		PrintAndLog("Undefined simptype %d", simType);
+		return usage_hf_iclass_sim();
+	}
 
+	uint8_t numberOfCSNs=0;
 	if(simType == 2)
 	{
 		UsbCommand c = {CMD_SIMULATE_TAG_ICLASS, {simType,NUM_CSNS}};
 		UsbCommand resp = {0};
 
-		/*uint8_t csns[8 * NUM_CSNS] = {
-			 0x00,0x0B,0x0F,0xFF,0xF7,0xFF,0x12,0xE0 ,
-			 0x00,0x13,0x94,0x7e,0x76,0xff,0x12,0xe0 ,
-			 0x2a,0x99,0xac,0x79,0xec,0xff,0x12,0xe0 ,
-			 0x17,0x12,0x01,0xfd,0xf7,0xff,0x12,0xe0 ,
-			 0xcd,0x56,0x01,0x7c,0x6f,0xff,0x12,0xe0 ,
-			 0x4b,0x5e,0x0b,0x72,0xef,0xff,0x12,0xe0 ,
-			 0x00,0x73,0xd8,0x75,0x58,0xff,0x12,0xe0 ,
-			 0x0c,0x90,0x32,0xf3,0x5d,0xff,0x12,0xe0 };
-*/
-      
-       uint8_t csns[8*NUM_CSNS] = {
-        0x00, 0x0B, 0x0F, 0xFF, 0xF7, 0xFF, 0x12, 0xE0,
-        0x00, 0x04, 0x0E, 0x08, 0xF7, 0xFF, 0x12, 0xE0,
-        0x00, 0x09, 0x0D, 0x05, 0xF7, 0xFF, 0x12, 0xE0,
-        0x00, 0x0A, 0x0C, 0x06, 0xF7, 0xFF, 0x12, 0xE0,
-        0x00, 0x0F, 0x0B, 0x03, 0xF7, 0xFF, 0x12, 0xE0,
-        0x00, 0x08, 0x0A, 0x0C, 0xF7, 0xFF, 0x12, 0xE0,
-        0x00, 0x0D, 0x09, 0x09, 0xF7, 0xFF, 0x12, 0xE0,
-        0x00, 0x0E, 0x08, 0x0A, 0xF7, 0xFF, 0x12, 0xE0,
-        0x00, 0x03, 0x07, 0x17, 0xF7, 0xFF, 0x12, 0xE0,
-        0x00, 0x3C, 0x06, 0xE0, 0xF7, 0xFF, 0x12, 0xE0,
-        0x00, 0x01, 0x05, 0x1D, 0xF7, 0xFF, 0x12, 0xE0,
-        0x00, 0x02, 0x04, 0x1E, 0xF7, 0xFF, 0x12, 0xE0,
-        0x00, 0x07, 0x03, 0x1B, 0xF7, 0xFF, 0x12, 0xE0,
-        0x00, 0x00, 0x02, 0x24, 0xF7, 0xFF, 0x12, 0xE0,
-        0x00, 0x05, 0x01, 0x21, 0xF7, 0xFF, 0x12, 0xE0 };
+		uint8_t csns[8*NUM_CSNS] = {
+			0x00, 0x0B, 0x0F, 0xFF, 0xF7, 0xFF, 0x12, 0xE0,
+			0x00, 0x04, 0x0E, 0x08, 0xF7, 0xFF, 0x12, 0xE0,
+			0x00, 0x09, 0x0D, 0x05, 0xF7, 0xFF, 0x12, 0xE0,
+			0x00, 0x0A, 0x0C, 0x06, 0xF7, 0xFF, 0x12, 0xE0,
+			0x00, 0x0F, 0x0B, 0x03, 0xF7, 0xFF, 0x12, 0xE0,
+			0x00, 0x08, 0x0A, 0x0C, 0xF7, 0xFF, 0x12, 0xE0,
+			0x00, 0x0D, 0x09, 0x09, 0xF7, 0xFF, 0x12, 0xE0,
+			0x00, 0x0E, 0x08, 0x0A, 0xF7, 0xFF, 0x12, 0xE0,
+			0x00, 0x03, 0x07, 0x17, 0xF7, 0xFF, 0x12, 0xE0,
+			0x00, 0x3C, 0x06, 0xE0, 0xF7, 0xFF, 0x12, 0xE0,
+			0x00, 0x01, 0x05, 0x1D, 0xF7, 0xFF, 0x12, 0xE0,
+			0x00, 0x02, 0x04, 0x1E, 0xF7, 0xFF, 0x12, 0xE0,
+			0x00, 0x07, 0x03, 0x1B, 0xF7, 0xFF, 0x12, 0xE0,
+			0x00, 0x00, 0x02, 0x24, 0xF7, 0xFF, 0x12, 0xE0,
+			0x00, 0x05, 0x01, 0x21, 0xF7, 0xFF, 0x12, 0xE0 };
 
 		memcpy(c.d.asBytes, csns, 8*NUM_CSNS);
 
@@ -164,124 +161,124 @@ int CmdHFiClassSim(const char *Cmd)
 		SendCommand(&c);
 	}
 
-  return 0;
+	return 0;
 }
 
 int CmdHFiClassReader(const char *Cmd)
 {
-  UsbCommand c = {CMD_READER_ICLASS, {0}};
-  SendCommand(&c);
-    UsbCommand resp;
-  while(!ukbhit()){
-      if (WaitForResponseTimeout(CMD_ACK,&resp,4500)) {
-            uint8_t isOK    = resp.arg[0] & 0xff;
-            uint8_t * data  = resp.d.asBytes;
-
-            PrintAndLog("isOk:%02x", isOK);
-            if( isOK == 0){
-                //Aborted
-                PrintAndLog("Quitting...");
-                return 0;
-            }
-            if(isOK > 0)
-            {
-                PrintAndLog("CSN: %s",sprint_hex(data,8));
-            }
-            if(isOK >= 1)
-            {
-                PrintAndLog("CC: %s",sprint_hex(data+8,8));
-            }else{
-                PrintAndLog("No CC obtained");
-            }
-        } else {
-            PrintAndLog("Command execute timeout");
-        }
-    }
-
-  return 0;
+	UsbCommand c = {CMD_READER_ICLASS, {0}};
+	SendCommand(&c);
+	UsbCommand resp;
+	while(!ukbhit()){
+		if (WaitForResponseTimeout(CMD_ACK,&resp,4500)) {
+			uint8_t isOK    = resp.arg[0] & 0xff;
+			uint8_t * data  = resp.d.asBytes;
+
+			PrintAndLog("isOk:%02x", isOK);
+			if( isOK == 0){
+				//Aborted
+				PrintAndLog("Quitting...");
+				return 0;
+			}
+			if(isOK > 0)
+			{
+				PrintAndLog("CSN: %s",sprint_hex(data,8));
+			}
+			if(isOK >= 1)
+			{
+				PrintAndLog("CC: %s",sprint_hex(data+8,8));
+			}else{
+				PrintAndLog("No CC obtained");
+			}
+		} else {
+			PrintAndLog("Command execute timeout");
+		}
+	}
+
+	return 0;
 }
 
 int CmdHFiClassReader_Replay(const char *Cmd)
 {
-  uint8_t readerType = 0;
-  uint8_t MAC[4]={0x00, 0x00, 0x00, 0x00};
+	uint8_t readerType = 0;
+	uint8_t MAC[4]={0x00, 0x00, 0x00, 0x00};
 
-  if (strlen(Cmd)<1) {
-    PrintAndLog("Usage:  hf iclass replay <MAC>");
-    PrintAndLog("        sample: hf iclass replay 00112233");
-    return 0;
-  }
+	if (strlen(Cmd)<1) {
+		PrintAndLog("Usage:  hf iclass replay <MAC>");
+		PrintAndLog("        sample: hf iclass replay 00112233");
+		return 0;
+	}
 
-  if (param_gethex(Cmd, 0, MAC, 8)) {
-    PrintAndLog("MAC must include 8 HEX symbols");
-    return 1;
-  }
+	if (param_gethex(Cmd, 0, MAC, 8)) {
+		PrintAndLog("MAC must include 8 HEX symbols");
+		return 1;
+	}
 
-  UsbCommand c = {CMD_READER_ICLASS_REPLAY, {readerType}};
-  memcpy(c.d.asBytes, MAC, 4);
-  SendCommand(&c);
+	UsbCommand c = {CMD_READER_ICLASS_REPLAY, {readerType}};
+	memcpy(c.d.asBytes, MAC, 4);
+	SendCommand(&c);
 
-  return 0;
+	return 0;
 }
 
 int CmdHFiClassReader_Dump(const char *Cmd)
 {
-  uint8_t readerType = 0;
-  uint8_t MAC[4]={0x00,0x00,0x00,0x00};
-  uint8_t KEY[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
-  uint8_t CSN[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
-  uint8_t CCNR[12]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
-  //uint8_t CC_temp[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
-  uint8_t div_key[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
-  uint8_t keytable[128] = {0};
-  int elite = 0;
-  uint8_t *used_key;
-  int i;
-  if (strlen(Cmd)<1) 
-  {
-    PrintAndLog("Usage:  hf iclass dump <Key> [e]");
-    PrintAndLog("        Key    - A 16 byte master key");
-    PrintAndLog("        e      - If 'e' is specified, the key is interpreted as the 16 byte");
-    PrintAndLog("                 Custom Key (KCus), which can be obtained via reader-attack");
-    PrintAndLog("                 See 'hf iclass sim 2'. This key should be on iclass-format");
-    PrintAndLog("        sample: hf iclass dump 0011223344556677");
-
-
-    return 0;
-  }
-
-  if (param_gethex(Cmd, 0, KEY, 16)) 
-  {
-    PrintAndLog("KEY must include 16 HEX symbols");
-    return 1;
-  }
-
-  if (param_getchar(Cmd, 1) == 'e')
-  {
-    PrintAndLog("Elite switch on");
-    elite = 1;
-
-    //calc h2
-    hash2(KEY, keytable);
-    printarr_human_readable("keytable", keytable, 128);
-
-  }
-
-  UsbCommand resp;
-  uint8_t key_sel[8] = {0};
-  uint8_t key_sel_p[8] = { 0 };
-
-  UsbCommand c = {CMD_READER_ICLASS, {0}};
-  c.arg[0] = FLAG_ICLASS_READER_ONLY_ONCE| FLAG_ICLASS_READER_GET_CC;
-  SendCommand(&c);
-  
-
-
-  if (!WaitForResponseTimeout(CMD_ACK,&resp,4500))
-  {
-	  PrintAndLog("Command execute timeout");
-	  return 0;
-  }
+	uint8_t readerType = 0;
+	uint8_t MAC[4]={0x00,0x00,0x00,0x00};
+	uint8_t KEY[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
+	uint8_t CSN[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
+	uint8_t CCNR[12]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
+	//uint8_t CC_temp[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
+	uint8_t div_key[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
+	uint8_t keytable[128] = {0};
+	int elite = 0;
+	uint8_t *used_key;
+	int i;
+	if (strlen(Cmd)<1)
+	{
+		PrintAndLog("Usage:  hf iclass dump <Key> [e]");
+		PrintAndLog("        Key    - A 16 byte master key");
+		PrintAndLog("        e      - If 'e' is specified, the key is interpreted as the 16 byte");
+		PrintAndLog("                 Custom Key (KCus), which can be obtained via reader-attack");
+		PrintAndLog("                 See 'hf iclass sim 2'. This key should be on iclass-format");
+		PrintAndLog("        sample: hf iclass dump 0011223344556677");
+
+
+		return 0;
+	}
+
+	if (param_gethex(Cmd, 0, KEY, 16))
+	{
+		PrintAndLog("KEY must include 16 HEX symbols");
+		return 1;
+	}
+
+	if (param_getchar(Cmd, 1) == 'e')
+	{
+		PrintAndLog("Elite switch on");
+		elite = 1;
+
+		//calc h2
+		hash2(KEY, keytable);
+		printarr_human_readable("keytable", keytable, 128);
+
+	}
+
+	UsbCommand resp;
+	uint8_t key_sel[8] = {0};
+	uint8_t key_sel_p[8] = { 0 };
+
+	UsbCommand c = {CMD_READER_ICLASS, {0}};
+	c.arg[0] = FLAG_ICLASS_READER_ONLY_ONCE| FLAG_ICLASS_READER_GET_CC;
+	SendCommand(&c);
+
+
+
+	if (!WaitForResponseTimeout(CMD_ACK,&resp,4500))
+	{
+		PrintAndLog("Command execute timeout");
+		return 0;
+	}
 
 	uint8_t isOK    = resp.arg[0] & 0xff;
 	uint8_t * data  = resp.d.asBytes;
@@ -325,7 +322,7 @@ int CmdHFiClassReader_Dump(const char *Cmd)
 	PrintAndLog("Hash0, a.k.a diversified key, that is computed using Ksel and stored in the card (Block 3):");
 	printvar("Div key", div_key, 8);
 	printvar("CC_NR:",CCNR,12);
-	doMAC(CCNR,12,div_key, MAC);
+	doMAC(CCNR,div_key, MAC);
 	printvar("MAC", MAC, 4);
 
 	uint8_t iclass_data[32000] = {0};
@@ -366,7 +363,9 @@ int CmdHFiClassReader_Dump(const char *Cmd)
 					//create a preferred filename
 					snprintf(filename, 100,"iclass_tagdump-%02x%02x%02x%02x%02x%02x%02x%02x",
 							 CSN[0],CSN[1],CSN[2],CSN[3],
-							 CSN[4],CSN[5],CSN[6],CSN[7]);
+							CSN[4],CSN[5],CSN[6],CSN[7]);
+					//Place the div_key in block 3
+					memcpy(iclass_data+(3*8), div_key, 8);
 					saveFile(filename,"bin",iclass_data, iclass_datalen );
 				}
 				//Aaaand we're finished
@@ -376,7 +375,7 @@ int CmdHFiClassReader_Dump(const char *Cmd)
 	}
 
 
-  return 0;
+	return 0;
 }
 
 int hf_iclass_eload_usage()
@@ -422,9 +421,12 @@ int CmdHFiClassELoad(const char *Cmd)
 	fseek(f, 0, SEEK_SET);
 
 	uint8_t *dump = malloc(fsize);
+
+
 	size_t bytes_read = fread(dump, 1, fsize, f);
 	fclose(f);
 
+	printIclassDumpInfo(dump);
 	//Validate
 
 	if (bytes_read < fsize)
@@ -450,83 +452,180 @@ int CmdHFiClassELoad(const char *Cmd)
 	return 0;
 }
 
+int usage_hf_iclass_decrypt()
+{
+	PrintAndLog("Usage: hf iclass decrypt f <tagdump> o ");
+	PrintAndLog("");
+	PrintAndLog("OBS! In order to use this function, the file 'iclass_decryptionkey.bin' must reside");
+	PrintAndLog("in the working directory. The file should be 16 bytes binary data");
+	PrintAndLog("");
+	PrintAndLog("example: hf iclass decrypt f tagdump_12312342343.bin");
+	PrintAndLog("");
+	PrintAndLog("OBS! This is pretty stupid implementation, it tries to decrypt every block after block 6. ");
+	PrintAndLog("Correct behaviour would be to decrypt only the application areas where the key is valid,");
+	PrintAndLog("which is defined by the configuration block.");
+	return 1;
+}
+
+int readKeyfile(const char *filename, size_t len, uint8_t* buffer)
+{
+	FILE *f = fopen(filename, "rb");
+	if(!f) {
+		PrintAndLog("Failed to read from file '%s'", filename);
+		return 1;
+	}
+	fseek(f, 0, SEEK_END);
+	long fsize = ftell(f);
+	fseek(f, 0, SEEK_SET);
+	size_t bytes_read = fread(buffer, 1, len, f);
+	fclose(f);
+	if(fsize != len)
+	{
+		PrintAndLog("Warning, file size is %d, expected %d", fsize, len);
+		return 1;
+	}
+	if(bytes_read != len)
+	{
+		PrintAndLog("Warning, could only read %d bytes, expected %d" ,bytes_read, len);
+		return 1;
+	}
+	return 0;
+}
+
+int CmdHFiClassDecrypt(const char *Cmd)
+{
+	uint8_t key[16] = { 0 };
+	if(readKeyfile("iclass_decryptionkey.bin", 16, key))
+	{
+		usage_hf_iclass_decrypt();
+		return 1;
+	}
+	PrintAndLog("Decryption file found... ");
+	char opt = param_getchar(Cmd, 0);
+	if (strlen(Cmd)<1 || opt == 'h')
+		return usage_hf_iclass_decrypt();
+
+	//Open the tagdump-file
+	FILE *f;
+	char filename[FILE_PATH_SIZE];
+	if(opt == 'f' && param_getstr(Cmd, 1, filename) > 0)
+	{
+		f = fopen(filename, "rb");
+	}else{
+		return usage_hf_iclass_decrypt();
+	}
+
+	fseek(f, 0, SEEK_END);
+	long fsize = ftell(f);
+	fseek(f, 0, SEEK_SET);
+	uint8_t enc_dump[8] = {0};
+	uint8_t *decrypted = malloc(fsize);
+	des3_context ctx = { DES_DECRYPT ,{ 0 } };
+	des3_set2key_dec( &ctx, key);
+	size_t bytes_read = fread(enc_dump, 1, 8, f);
+
+	//Use the first block (CSN) for filename
+	char outfilename[FILE_PATH_SIZE] = { 0 };
+	snprintf(outfilename,FILE_PATH_SIZE,"iclass_tagdump-%02x%02x%02x%02x%02x%02x%02x%02x-decrypted",
+			 enc_dump[0],enc_dump[1],enc_dump[2],enc_dump[3],
+			 enc_dump[4],enc_dump[5],enc_dump[6],enc_dump[7]);
+
+	size_t blocknum =0;
+	while(bytes_read == 8)
+	{
+		if(blocknum < 7)
+		{
+			memcpy(decrypted+(blocknum*8), enc_dump, 8);
+		}else{
+			des3_crypt_ecb(&ctx, enc_dump,decrypted +(blocknum*8) );
+		}
+		printvar("decrypted block", decrypted +(blocknum*8), 8);
+		bytes_read = fread(enc_dump, 1, 8, f);
+		blocknum++;
+	}
+	fclose(f);
+
+	saveFile(outfilename,"bin", decrypted, blocknum*8);
+
+	return 0;
+}
 
 int CmdHFiClass_iso14443A_write(const char *Cmd)
 {
-  uint8_t readerType = 0;
-  uint8_t MAC[4]={0x00,0x00,0x00,0x00};
-  uint8_t KEY[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
-  uint8_t CSN[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
-  uint8_t CCNR[12]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
-  uint8_t div_key[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
-
-  uint8_t blockNo=0;
-  uint8_t bldata[8]={0};
-
-  if (strlen(Cmd)<3) 
-  {
-    PrintAndLog("Usage:  hf iclass write <Key> <Block> <Data>");
-    PrintAndLog("        sample: hf iclass write 0011223344556677 10 AAAAAAAAAAAAAAAA");
-    return 0;
-  }
-
-  if (param_gethex(Cmd, 0, KEY, 16)) 
-  {
-    PrintAndLog("KEY must include 16 HEX symbols");
-    return 1;
-  }
-  
-  blockNo = param_get8(Cmd, 1);
-  if (blockNo>32)
-  {
-        PrintAndLog("Error: Maximum number of blocks is 32 for iClass 2K Cards!");
-        return 1;
-  }
-  if (param_gethex(Cmd, 2, bldata, 8)) 
-  {
-        PrintAndLog("Block data must include 8 HEX symbols");
-        return 1;
-  }
-  
-  UsbCommand c = {CMD_ICLASS_ISO14443A_WRITE, {0}};
-  SendCommand(&c);
-  UsbCommand resp;
-
-  if (WaitForResponseTimeout(CMD_ACK,&resp,4500)) {
-    uint8_t isOK    = resp.arg[0] & 0xff;
-    uint8_t * data  = resp.d.asBytes;
-    
-    memcpy(CSN,data,8);
-    memcpy(CCNR,data+8,8);
-    PrintAndLog("DEBUG: %s",sprint_hex(CSN,8));
-	PrintAndLog("DEBUG: %s",sprint_hex(CCNR,8));
-	PrintAndLog("isOk:%02x", isOK);
-  } else {
-	PrintAndLog("Command execute timeout");
-  }
-
-  diversifyKey(CSN,KEY, div_key);
-
-  PrintAndLog("Div Key: %s",sprint_hex(div_key,8));
-  doMAC(CCNR, 12,div_key, MAC);
-
-  UsbCommand c2 = {CMD_ICLASS_ISO14443A_WRITE, {readerType,blockNo}};
-  memcpy(c2.d.asBytes, bldata, 8);
-  memcpy(c2.d.asBytes+8, MAC, 4);
-  SendCommand(&c2);
-
-  if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
-    uint8_t isOK    = resp.arg[0] & 0xff;
-    uint8_t * data  = resp.d.asBytes;
-
-    if (isOK)
-      PrintAndLog("isOk:%02x data:%s", isOK, sprint_hex(data, 4));
-    else
-      PrintAndLog("isOk:%02x", isOK);
-  } else {
-      PrintAndLog("Command execute timeout");
-  }
-  return 0;
+	uint8_t readerType = 0;
+	uint8_t MAC[4]={0x00,0x00,0x00,0x00};
+	uint8_t KEY[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
+	uint8_t CSN[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
+	uint8_t CCNR[12]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
+	uint8_t div_key[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
+
+	uint8_t blockNo=0;
+	uint8_t bldata[8]={0};
+
+	if (strlen(Cmd)<3)
+	{
+		PrintAndLog("Usage:  hf iclass write <Key> <Block> <Data>");
+		PrintAndLog("        sample: hf iclass write 0011223344556677 10 AAAAAAAAAAAAAAAA");
+		return 0;
+	}
+
+	if (param_gethex(Cmd, 0, KEY, 16))
+	{
+		PrintAndLog("KEY must include 16 HEX symbols");
+		return 1;
+	}
+
+	blockNo = param_get8(Cmd, 1);
+	if (blockNo>32)
+	{
+		PrintAndLog("Error: Maximum number of blocks is 32 for iClass 2K Cards!");
+		return 1;
+	}
+	if (param_gethex(Cmd, 2, bldata, 8))
+	{
+		PrintAndLog("Block data must include 8 HEX symbols");
+		return 1;
+	}
+
+	UsbCommand c = {CMD_ICLASS_ISO14443A_WRITE, {0}};
+	SendCommand(&c);
+	UsbCommand resp;
+
+	if (WaitForResponseTimeout(CMD_ACK,&resp,4500)) {
+		uint8_t isOK    = resp.arg[0] & 0xff;
+		uint8_t * data  = resp.d.asBytes;
+
+		memcpy(CSN,data,8);
+		memcpy(CCNR,data+8,8);
+		PrintAndLog("DEBUG: %s",sprint_hex(CSN,8));
+		PrintAndLog("DEBUG: %s",sprint_hex(CCNR,8));
+		PrintAndLog("isOk:%02x", isOK);
+	} else {
+		PrintAndLog("Command execute timeout");
+	}
+
+	diversifyKey(CSN,KEY, div_key);
+
+	PrintAndLog("Div Key: %s",sprint_hex(div_key,8));
+	doMAC(CCNR, div_key, MAC);
+
+	UsbCommand c2 = {CMD_ICLASS_ISO14443A_WRITE, {readerType,blockNo}};
+	memcpy(c2.d.asBytes, bldata, 8);
+	memcpy(c2.d.asBytes+8, MAC, 4);
+	SendCommand(&c2);
+
+	if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
+		uint8_t isOK    = resp.arg[0] & 0xff;
+		uint8_t * data  = resp.d.asBytes;
+
+		if (isOK)
+			PrintAndLog("isOk:%02x data:%s", isOK, sprint_hex(data, 4));
+		else
+			PrintAndLog("isOk:%02x", isOK);
+	} else {
+		PrintAndLog("Command execute timeout");
+	}
+	return 0;
 }
 int CmdHFiClass_loclass(const char *Cmd)
 {
@@ -550,13 +649,13 @@ int CmdHFiClass_loclass(const char *Cmd)
 	char fileName[255] = {0};
 	if(opt == 'f')
 	{
-			if(param_getstr(Cmd, 1, fileName) > 0)
-			{
-				return bruteforceFileNoKeys(fileName);
-			}else
-			{
-				PrintAndLog("You must specify a filename");
-			}
+		if(param_getstr(Cmd, 1, fileName) > 0)
+		{
+			return bruteforceFileNoKeys(fileName);
+		}else
+		{
+			PrintAndLog("You must specify a filename");
+		}
 	}
 	else if(opt == 't')
 	{
@@ -583,20 +682,21 @@ static command_t CommandTable[] =
 	{"reader",CmdHFiClassReader,	0,	"Read an iClass tag"},
 	{"replay",CmdHFiClassReader_Replay,	0,	"Read an iClass tag via Reply Attack"},
 	{"dump",	CmdHFiClassReader_Dump,	0,		"Authenticate and Dump iClass tag"},
-	{"write",	CmdHFiClass_iso14443A_write,	0,	"Authenticate and Write iClass block"},
+//	{"write",	CmdHFiClass_iso14443A_write,	0,	"Authenticate and Write iClass block"},
 	{"loclass",	CmdHFiClass_loclass,	1,	"Use loclass to perform bruteforce of reader attack dump"},
 	{"eload",   CmdHFiClassELoad,    0,     "[experimental] Load data into iclass emulator memory"},
+	{"decrypt", CmdHFiClassDecrypt,  1,     "Decrypt tagdump" },
 	{NULL, NULL, 0, NULL}
 };
 
 int CmdHFiClass(const char *Cmd)
 {
-  CmdsParse(CommandTable, Cmd);
-  return 0;
+	CmdsParse(CommandTable, Cmd);
+	return 0;
 }
 
 int CmdHelp(const char *Cmd)
 {
-  CmdsHelp(CommandTable);
-  return 0;
+	CmdsHelp(CommandTable);
+	return 0;
 }