Android Open Source - android-nfc-reader Mifare Classic Reader

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License

The source code is released under:

MIT License

Java Source Code

package net.mklbravo.lib.nfcreader.readers;
/* ww  w  .ja  va2 s. c  o m*/
import android.nfc.Tag;
import android.nfc.tech.MifareClassic;
import net.mklbravo.lib.nfcreader.tags.MifareClassicTag;
import net.mklbravo.lib.nfcreader.utils.Converter;

import java.io.IOException;
import java.util.ArrayList;

public class MifareClassicReader extends AbstractReader {
  private final int MIFARE_SECTOR_COUNT = 16;
  private ArrayList<String> passwords = new ArrayList<String>();
  private MifareClassicTag mifareTag;
  private int sectorsToRead = 16;

  public MifareClassicReader(Tag pAndroidTag) {
    super(pAndroidTag);
    initializeReader();
  }

  public MifareClassicReader(Tag pAndroidTag, int pSectorsToRead){
    super(pAndroidTag);
    initializeReader();
  }

  private void initializeReader(){
    mifareTag = new MifareClassicTag(tagId);
    setDefaultPasswords();
  }

  private void setDefaultPasswords(){
    setReadPassword("A0A1A2A3A4A5");
  }

  public MifareClassicTag getMifareClassicTag(){
    return mifareTag;
  }

  @Override
  public void setReadPassword(String pPassword) {
    passwords.add(0,pPassword);
  }

  @Override
  public void readTag() {
    try {
      MifareClassic androidMifare = MifareClassic.get(androidTag);
      androidMifare.connect();

      for (int sectorIndex = 0; sectorIndex < MIFARE_SECTOR_COUNT; sectorIndex++) {
        readSector(androidMifare,sectorIndex);
      }
    } catch (IOException e) {
      //TODO
    }
  }

  private void readSector(MifareClassic tag,int sectorIndex) throws IOException{
    if (authenticateSector(tag,sectorIndex)) {
      int blockCount = tag.getBlockCountInSector(sectorIndex);
      int firstBlockIndex = tag.sectorToBlock(sectorIndex);

      for (int blockIndex = 0; blockIndex < blockCount; blockIndex++) {
        byte[] data = tag.readBlock(firstBlockIndex + blockIndex);
        mifareTag.addData(sectorIndex,blockIndex,data);
      }
    }
  }

  private boolean authenticateSector(MifareClassic tag,int sectorIndex) throws IOException{
    if(passwords.isEmpty())return false;
    boolean authOk = false;
    for(String psw: passwords ){
      byte[] bytePsw = Converter.hexStringToByteArray(psw);
      authOk = tag.authenticateSectorWithKeyA(sectorIndex,bytePsw);
      if(authOk) break;
    }
    return authOk;
  }
}

Java Source Code List

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