ReceiptInfoFragment.java

package com.rava.voting.ui;

import java.math.BigInteger;
import java.nio.charset.Charset;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.rau.evoting.ElGamal.BigIntegerTypeAdapter;
import com.rau.evoting.ElGamal.ChaumPedersen;
import com.rau.evoting.ElGamal.CryptoUtil;
import com.rau.evoting.ElGamal.GlobalParameters;
import com.rava.voting.R;

public class ReceiptInfoFragment extends Fragment {

	public static final String TAG = "ReceiptInfoFragment";

	// public static final String KEY_A = "KEY_A";
	// public static final String KEY_B = "KEY_B";
	// public static final String KEY_MESSAGE = "KEY_MESSAGE";

	private TextView mTextViewP;
	private TextView mTextViewG;
	private TextView mTextViewY;
	private TextView mTextViewA;
	private TextView mTextViewB;
	private TextView mTextViewMessage;
	private TextView mTextViewMessageBigInt;
	private TextView mTextViewY1;
	private TextView mTextViewY2;
	private TextView mTextViewA1;
	private TextView mTextViewA2;
	private TextView mTextViewC;
	private TextView mTextViewS;
	private TextView mTextViewRes1;
	private TextView mTextViewRes2;
	private TextView mTextViewNote;
	private TextView mTextViewNextNote;
	private TextView mtextViewWrongQrcode;
	private Button mButtonNext;
	private TableRow mTableRowA;
	private TableRow mTableRowB;
	private TableRow mTableRowMessage;
	private TableRow mTableRowMessageBigInt;
	private TableRow mTableRowA1;
	private TableRow mTableRowA2;
	private TableRow mTableRowC;
	private TableRow mTableRowS;
	private TableRow mTableRowRes1;
	private TableRow mTableRowRes2;
	private TableLayout mTableLayoutReceiptInfo;
	
	
	
	private int clicks = 0;

	private BigInteger p;
	private BigInteger g;
	private BigInteger y;
	// private BigInteger r = new BigInteger("43245626364");
	private BigInteger a;
	private BigInteger b;
	private BigInteger y1;
	private BigInteger y2;
	private BigInteger a1;
	private BigInteger a2;
	//private BigInteger k;
	private BigInteger c;
	private BigInteger s;
	private BigInteger res1;
	private BigInteger res2;

	private ChaumPedersen mChaumPedersen;

	public static ReceiptInfoFragment newInstance(String content) {
		ReceiptInfoFragment fragment = new ReceiptInfoFragment();
		Bundle args = new Bundle();
		args.putString("content", content);
		fragment.setArguments(args);
		return fragment;
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		View root = inflater.inflate(R.layout.fragment_receipt_info, container,
				false);
		mTextViewP = (TextView) root.findViewById(R.id.textview_p);
		mTextViewG = (TextView) root.findViewById(R.id.textview_g);
		mTextViewY = (TextView) root.findViewById(R.id.textview_y);
		mTextViewA = (TextView) root.findViewById(R.id.textview_a);
		mTextViewB = (TextView) root.findViewById(R.id.textview_b);
		mTextViewMessage = (TextView) root.findViewById(R.id.textview_message);
		mTextViewMessageBigInt = (TextView) root
				.findViewById(R.id.textview_message_bigint);
		mTextViewY1 = (TextView) root.findViewById(R.id.textview_y1);
		mTextViewY2 = (TextView) root.findViewById(R.id.textview_y2);
		mTextViewA1 = (TextView) root.findViewById(R.id.textview_a1);
		mTextViewA2 = (TextView) root.findViewById(R.id.textview_a2);
		mTextViewC = (TextView) root.findViewById(R.id.textview_c);
		mTextViewS = (TextView) root.findViewById(R.id.textview_s);
		mTextViewRes1 = (TextView) root.findViewById(R.id.textview_res1);
		mTextViewRes2 = (TextView) root.findViewById(R.id.textview_res2);
		mTextViewNote = (TextView) root.findViewById(R.id.textview_note);
		mTextViewNextNote = (TextView) root
				.findViewById(R.id.textview_next_note);
		mtextViewWrongQrcode = (TextView) root.findViewById(R.id.textview_wrong_qrcode);
		mButtonNext = (Button) root.findViewById(R.id.button_next);
		mButtonNext.setOnClickListener(new NextClick());
		mTableRowA = (TableRow) root.findViewById(R.id.tablerow_a);
		mTableRowB = (TableRow) root.findViewById(R.id.tablerow_b);
		mTableRowMessage = (TableRow) root.findViewById(R.id.tablerow_message);
		mTableRowMessageBigInt = (TableRow) root
				.findViewById(R.id.tablerow_message_bigint);
		mTableRowA1 = (TableRow) root.findViewById(R.id.tablerow_a1);
		mTableRowA2 = (TableRow) root.findViewById(R.id.tablerow_a2);
		mTableRowC = (TableRow) root.findViewById(R.id.tablerow_c);
		mTableRowS = (TableRow) root.findViewById(R.id.tablerow_s);
		mTableRowRes1 = (TableRow) root.findViewById(R.id.tablerow_result1);
		mTableRowRes2 = (TableRow) root.findViewById(R.id.tablerow_result2);
		mTableLayoutReceiptInfo = (TableLayout) root.findViewById(R.id.tablelayout_receipt_info);
		return root;
	}

	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		super.onActivityCreated(savedInstanceState);

		Bundle args = getArguments();
		String content = args.getString("content");

		Gson gson = new GsonBuilder().registerTypeAdapter(BigInteger.class,
				new BigIntegerTypeAdapter()).create();
		try {
			mChaumPedersen = gson.fromJson(content, ChaumPedersen.class);
			calculate();
		} catch (Exception ex) {
			mTableLayoutReceiptInfo.setVisibility(View.GONE);
			mTextViewNextNote.setVisibility(View.GONE);
			mtextViewWrongQrcode.setVisibility(View.VISIBLE);
		}

	}

	private void calculate() {

		a = mChaumPedersen.getA();
		b = mChaumPedersen.getB();
		String message = mChaumPedersen.getMessage();

		p = GlobalParameters.getParams().getP();// mChaumPedersen.getP();
		g = GlobalParameters.getParams().getG(); // mChaumPedersen.getG();
		y = mChaumPedersen.getY();

		Charset charset = Charset.forName("ISO-8859-1");
		byte[] bytes = message.getBytes(charset);
		BigInteger messageBigint =  CryptoUtil.stringToBigInteger(message);// new BigInteger(bytes);
		y1 = a;
		y2 = b.divide(messageBigint).mod(p);

		mTextViewP.setText(p.toString());
		mTextViewG.setText(g.toString());
		mTextViewY.setText(y.toString());
		mTextViewA.setText(a.toString());
		mTextViewB.setText(b.toString());
		mTextViewMessage.setText(message);
		mTextViewMessageBigInt.setText(messageBigint.toString());
		mTextViewY1.setText(y1.toString());
		mTextViewY2.setText(y2.toString());
		
		
		
		// change to random
		// k = new BigInteger("1231365");
		a1 = mChaumPedersen.getA1();// g.modPow(k, p);
		a2 = mChaumPedersen.getA2(); // y.modPow(k, p);

		mTextViewA1.setText(a1.toString());
		mTextViewA2.setText(a2.toString());

		mTextViewNote.setText(getResources().getString(R.string.note2));
		mTextViewNextNote
				.setText(getResources().getString(R.string.next_note2));

		String temp = a1.toString().concat(a2.toString());
		long t2 = temp.hashCode();
		c = BigInteger.valueOf(t2).mod(p);
		// c = new BigInteger("111");
		mTextViewC.setText(c.toString());

		mTextViewNextNote
				.setText(getResources().getString(R.string.next_note3));

		mTableRowS.setVisibility(View.VISIBLE);

		// BigInteger temp2 = c.multiply(r).mod(p);
		s = mChaumPedersen.getS(); // k.subtract(temp2).mod(p);

		mTextViewS.setText(s.toString());

		mTextViewNextNote
				.setText(getResources().getString(R.string.next_note4));
		mTextViewNote.setVisibility(View.GONE);
		res1 = g.modPow(s, p).multiply(y1.modPow(c, p)).mod(p);
		res2 = y.modPow(s, p).multiply(y2.modPow(c, p)).mod(p);

		mTextViewRes1.setText(res1.toString());
		mTextViewRes2.setText(res2.toString());

		if (a1.equals(res1) && a2.equals(res2)) {
			mTextViewNextNote.setText(getResources().getString(
					R.string.next_note5));
		} else {
			mTextViewNextNote.setText(getResources().getString(
					R.string.next_error));
			mTextViewNextNote.setTextColor(getResources().getColor(
					android.R.color.holo_red_dark));
		}

	}

	private class NextClick implements OnClickListener {

		@Override
		public void onClick(View v) {
			clicks++;

			switch (clicks) {
			case 1:
				mTableRowA.setVisibility(View.GONE);
				mTableRowB.setVisibility(View.GONE);
				mTableRowMessage.setVisibility(View.GONE);
				mTableRowMessageBigInt.setVisibility(View.GONE);
				mTableRowA1.setVisibility(View.VISIBLE);
				mTableRowA2.setVisibility(View.VISIBLE);

				// change to random
				// k = new BigInteger("1231365");
				a1 = mChaumPedersen.getA1();// g.modPow(k, p);
				a2 = mChaumPedersen.getA2(); // y.modPow(k, p);

				mTextViewA1.setText(a1.toString());
				mTextViewA2.setText(a2.toString());

				mTextViewNote.setText(getResources().getString(R.string.note2));
				mTextViewNextNote.setText(getResources().getString(
						R.string.next_note2));

				break;

			case 2:
				mTableRowC.setVisibility(View.VISIBLE);
				String temp = a1.toString().concat(a2.toString());
				long t2 = temp.hashCode();
				// String hash = CryptoUtil.getSHA256hash(temp);
				c = BigInteger.valueOf(t2).mod(p);
				// c = new BigInteger(hash);
				// c = new BigInteger("111");
				mTextViewC.setText(c.toString());

				mTextViewNote.setVisibility(View.GONE);
				mTextViewNextNote.setText(getResources().getString(
						R.string.next_note3));

				break;

			case 3:
				mTableRowS.setVisibility(View.VISIBLE);

				// BigInteger temp2 = c.multiply(r).mod(p);
				s = mChaumPedersen.getS(); // k.subtract(temp2).mod(p);

				mTextViewS.setText(s.toString());

				// mTextViewNote.setVisibility(View.GONE);
				mTextViewNextNote.setText(getResources().getString(
						R.string.next_note4));

				break;
			case 4:
				mButtonNext.setVisibility(View.GONE);
				mTableRowRes1.setVisibility(View.VISIBLE);
				mTableRowRes2.setVisibility(View.VISIBLE);

				res1 = g.modPow(s, p).multiply(y1.modPow(c, p)).mod(p);
				res2 = y.modPow(s, p).multiply(y2.modPow(c, p)).mod(p);

				mTextViewRes1.setText(res1.toString());
				mTextViewRes2.setText(res2.toString());

				if (a1.equals(res1) && a2.equals(res2)) {
					mTextViewNextNote.setText(getResources().getString(
							R.string.next_note5));
				} else {
					mTextViewNextNote.setText(getResources().getString(
							R.string.next_error));
					mTextViewNextNote.setTextColor(getResources().getColor(
							android.R.color.holo_red_dark));
				}

				break;

			}

		}

	}

}