Example for Ntag216 authentication

examples/Ntag216_AUTH

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+//This example show how you can get Authenticated by the NTAG213,215,216 by default the tags are unprotected in order to protect them we need to write 4 different values:
+// Using mfrc522.MIFARE_Ultralight_Write(PageNum, Data, #Databytes)) 
+//1.- we need to write the 32bit passWord to page 0xE5 !for ntag 213 and 215 page is different refer to nxp documentation!
+//2.- Now Write the 16 bits pACK to the page 0xE6 use the 2 high bytes like this: pACKH + pACKL + 00 + 00 after an authentication the tag will return this secret bytes
+//3.- Now we need to write the first page we want to protect this is a 1 byte data in page 0xE3 we need to write 00 + 00 + 00 + firstPage  all pages after this one are write protected
+// Now WRITE protection is ACTIVATED so we need to get authenticated in order to write the last data
+//4.- Finally we need to write an access record in order to READ protect the card this step is optional only if you want to read protect also write 80 + 00 + 00 + 00 to 0xE4
+//After completeing all these steps you will nee to authentiate first in order to read or write ant page after the first page you selected to protect 
+//To disengage proection just write the page (0xE3) to 00 + 00 + 00 + FF that going to remove all protection
+//Made by GARGANTUA from RoboCreators.com & paradoxalabs.com
+
+#include <SPI.h>
+#include <MFRC522.h>
+
+#define RST_PIN    9   // 
+#define SS_PIN    10    //
+
+MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance
+
+void setup() {
+  Serial.begin(9600);   // Initialize serial communications with the PC
+  while (!Serial);    // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
+  SPI.begin();      // Init SPI bus
+  mfrc522.PCD_Init();   // Init MFRC522
+  Serial.println(F("Scan PICC to see UID, type, and data blocks..."));
+}
+
+void loop() {
+  // Look for new cards
+  if ( ! mfrc522.PICC_IsNewCardPresent()) {
+    return;
+  }
+
+  // Select one of the cards
+  if ( ! mfrc522.PICC_ReadCardSerial()) {
+    return;
+  }
+
+
+byte PSWBuff[]={0xFF,0xFF,0xFF,0xFF}; //32 bit PassWord default FFFFFFFF
+byte pACK[]={0,0}; //16 bit PassWord ACK returned by the NFCtag
+
+Serial.print("Auth: ");
+Serial.println(mfrc522.PCD_NTAG216_AUTH(&PSWBuff[0],pACK)); //Request Authentification if return STATUS_OK we are good
+
+//Print PassWordACK
+Serial.print(pACK[0],HEX);
+Serial.println(pACK[1],HEX);
+
+byte WBuff[] = {0x00,0x00,0x00,0x04};
+byte RBuff[18];
+
+//Serial.print("CHG BLK: ");
+//Serial.println(mfrc522.MIFARE_Ultralight_Write(0xE3, WBuff, 4));  //How to write to a page 
+    
+mfrc522.PICC_DumpMifareUltralightToSerial(); //This is a modifier dunp just cghange the for cicle to < 232 instead of < 16 in order to see all the pages on NTAG216
+
+delay(3000);
+}