X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/f4217d58b68ef3e7828892d8401ea1eb3da4696d..5ebdce44c014ae29d688367508d0a6f6e6ebc673:/client/cmdhfmfu.c?ds=sidebyside

diff --git a/client/cmdhfmfu.c b/client/cmdhfmfu.c
index a631b6b1..25a073d3 100644
--- a/client/cmdhfmfu.c
+++ b/client/cmdhfmfu.c
@@ -276,7 +276,20 @@ static int ulev1_readSignature( uint8_t *response, uint16_t responseLength ){
 	return len;
 }
 
-//make sure field is off before calling this function
+
+// Fudan check checks for which error is given for a command with incorrect crc
+// NXP UL chip responds with 01, fudan 00.
+// other possible checks:
+//  send a0 + crc 
+//  UL responds with 00, fudan doesn't respond
+//  or
+//  send a200 + crc
+//  UL doesn't respond, fudan responds with 00
+//  or
+//  send 300000 + crc (read with extra byte(s))
+//  UL responds with read of page 0, fudan doesn't respond.
+//
+// make sure field is off before calling this function
 static int ul_fudan_check( void ){
 	iso14a_card_select_t card;
 	if ( !ul_select(&card) ) 
@@ -895,10 +908,6 @@ int CmdHF14AMfUWrBl(const char *Cmd){
 	uint8_t authenticationkey[16] = {0x00};
 	uint8_t *authKeyPtr = authenticationkey;
 
-	// starting with getting tagtype
-	TagTypeUL_t tagtype = GetHF14AMfU_Type();
-	if (tagtype == UL_ERROR) return -1;
-
 	while(param_getchar(Cmd, cmdp) != 0x00)
 	{
 		switch(param_getchar(Cmd, cmdp))
@@ -930,21 +939,10 @@ int CmdHF14AMfUWrBl(const char *Cmd){
 			case 'b':
 			case 'B':
 				blockNo = param_get8(Cmd, cmdp+1);
-				
-				uint8_t maxblockno = 0;
-				for (uint8_t idx = 0; idx < MAX_UL_TYPES; idx++){
-					if (tagtype & UL_TYPES_ARRAY[idx])
-						maxblockno = UL_MEMORY_ARRAY[idx];
-				}
-		
 				if (blockNo < 0) {
 					PrintAndLog("Wrong block number");
 					errors = true;
 				}
-				if (blockNo > maxblockno){
-					PrintAndLog("block number too large. Max block is %u/0x%02X \n", maxblockno,maxblockno);
-					errors = true;
-				}
 				cmdp += 2;
 				break;
 			case 'l':
@@ -971,6 +969,19 @@ int CmdHF14AMfUWrBl(const char *Cmd){
 	}
 
 	if ( blockNo == -1 ) return usage_hf_mfu_wrbl();
+	// starting with getting tagtype
+	TagTypeUL_t tagtype = GetHF14AMfU_Type();
+	if (tagtype == UL_ERROR) return -1;
+
+	uint8_t maxblockno = 0;
+	for (uint8_t idx = 0; idx < MAX_UL_TYPES; idx++){
+		if (tagtype & UL_TYPES_ARRAY[idx])
+			maxblockno = UL_MEMORY_ARRAY[idx];
+	}
+	if (blockNo > maxblockno){
+		PrintAndLog("block number too large. Max block is %u/0x%02X \n", maxblockno,maxblockno);
+		return usage_hf_mfu_wrbl();
+	}
 
 	// Swap endianness 
 	if (swapEndian && hasAuthKey) authKeyPtr = SwapEndian64(authenticationkey, 16, 8);
@@ -1022,10 +1033,6 @@ int CmdHF14AMfURdBl(const char *Cmd){
 	uint8_t authenticationkey[16] = {0x00};
 	uint8_t *authKeyPtr = authenticationkey;
 
-	// starting with getting tagtype
-	TagTypeUL_t tagtype = GetHF14AMfU_Type();
-	if (tagtype == UL_ERROR) return -1;
-
 	while(param_getchar(Cmd, cmdp) != 0x00)
 	{
 		switch(param_getchar(Cmd, cmdp))
@@ -1057,21 +1064,10 @@ int CmdHF14AMfURdBl(const char *Cmd){
 			case 'b':
 			case 'B':
 				blockNo = param_get8(Cmd, cmdp+1);
-
-				uint8_t maxblockno = 0;
-				for (uint8_t idx = 0; idx < MAX_UL_TYPES; idx++){
-					if (tagtype & UL_TYPES_ARRAY[idx])
-						maxblockno = UL_MEMORY_ARRAY[idx];
-				}
-
 				if (blockNo < 0) {
 					PrintAndLog("Wrong block number");
 					errors = true;
 				}
-				if (blockNo > maxblockno){
-					PrintAndLog("block number to large. Max block is %u/0x%02X \n", maxblockno,maxblockno);
-					errors = true;
-				}
 				cmdp += 2;
 				break;
 			case 'l':
@@ -1089,6 +1085,19 @@ int CmdHF14AMfURdBl(const char *Cmd){
 	}
 
 	if ( blockNo == -1 ) return usage_hf_mfu_rdbl();
+	// start with getting tagtype
+	TagTypeUL_t tagtype = GetHF14AMfU_Type();
+	if (tagtype == UL_ERROR) return -1;
+
+	uint8_t maxblockno = 0;
+	for (uint8_t idx = 0; idx < MAX_UL_TYPES; idx++){
+		if (tagtype & UL_TYPES_ARRAY[idx])
+			maxblockno = UL_MEMORY_ARRAY[idx];
+	}
+	if (blockNo > maxblockno){
+		PrintAndLog("block number to large. Max block is %u/0x%02X \n", maxblockno,maxblockno);
+		return usage_hf_mfu_rdbl();
+	}
 
 	// Swap endianness 
 	if (swapEndian && hasAuthKey) authKeyPtr = SwapEndian64(authenticationkey, 16, 8);