Android Open Source - Easy_File_Encrypt Easy File Encrypt

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License

The source code is released under:

Copyright (c) 2011, 2012, Hunter Davis All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are m...

Java Source Code

package com.hunterdavis.easyfileencrypt;
/*ww  w. j a  v a  2s.c o  m*/
import java.io.File;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.spec.AlgorithmParameterSpec;
import java.util.Vector;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.google.ads.AdRequest;
import com.google.ads.AdView;

public class EasyFileEncrypt extends Activity {

  private static final AlgorithmParameterSpec AES_Key_Size = null;

  int SELECT_FILE = 122;

  String filePath = "";
  String password = "";
  int SELECT_MULTI_FILE = 223;
  
  static long fileSizeInBytes = 0;
  private Context magicContext;
  public Vector magicNamesVector;
    public Boolean lastEncrypt = false;
  

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    lastEncrypt = false;
    magicNamesVector = new Vector();

    // Create an anonymous implementation of OnClickListener
    OnClickListener loadButtonListner = new OnClickListener() {
      public void onClick(View v) {
        // do something when the button is clicked

        // in onCreate or any event where your want the user to
        Intent intent = new Intent(v.getContext(), FileDialog.class);
        intent.putExtra(FileDialog.START_PATH, "/sdcard");
        startActivityForResult(intent, SELECT_FILE);

      }
    };

    // Create an anonymous implementation of OnClickListener
    OnClickListener saveButtonListner = new OnClickListener() {
      public void onClick(View v) {
        // do something when the button is clicked
        AlertDialog.Builder alert = new AlertDialog.Builder(
            v.getContext());

        alert.setTitle("Password");
        alert.setMessage("Please Enter A Password to Encrypt File");

        // Set an EditText view to get user input
        final EditText input = new EditText(v.getContext());
        alert.setView(input);

        alert.setPositiveButton("Ok",
            new DialogInterface.OnClickListener() {
              public void onClick(DialogInterface dialog,
                  int whichButton) {
                String tempName = input.getText().toString();

                if (tempName.length() > 0) {
                  password = tempName;
                  scrambleFile(false);
                } else {
                  Toast.makeText(getBaseContext(),
                      "Invalid Password!",
                      Toast.LENGTH_LONG).show();
                }
              }

            });

        alert.setNegativeButton("Cancel",
            new DialogInterface.OnClickListener() {
              public void onClick(DialogInterface dialog,
                  int whichButton) {
                // Canceled.
              }
            });

        alert.show();

      }
    };

    // Create an anonymous implementation of OnClickListener
    OnClickListener decryptButtonListener = new OnClickListener() {
      public void onClick(View v) {
        magicNamesVector.clear();
        // do something when the button is clicked
        AlertDialog.Builder alert = new AlertDialog.Builder(
            v.getContext());

        alert.setTitle("Password");
        alert.setMessage("Please Enter A Password to Decrypt File");

        // Set an EditText view to get user input
        final EditText input = new EditText(v.getContext());
        alert.setView(input);

        alert.setPositiveButton("Ok",
            new DialogInterface.OnClickListener() {
              public void onClick(DialogInterface dialog,
                  int whichButton) {
                String tempName = input.getText().toString();

                if (tempName.length() > 0) {
                  password = tempName;
                  scrambleFile(true);
                } else {
                  Toast.makeText(getBaseContext(),
                      "Invalid Password!",
                      Toast.LENGTH_LONG).show();
                }
              }

            });

        alert.setNegativeButton("Cancel",
            new DialogInterface.OnClickListener() {
              public void onClick(DialogInterface dialog,
                  int whichButton) {
                // Canceled.
              }
            });

        alert.show();

      }
    };
    
    
    // Create an anonymous implementation of OnClickListener
    OnClickListener multiEncryptButtonListner = new OnClickListener() {
      public void onClick(View v) {
        magicNamesVector.clear();
        lastEncrypt = true;
        magicNamesVector.clear();
        magicContext = v.getContext();
        // in onCreate or any event where your want the user to
        Intent intent = new Intent(v.getContext(), FileDialog.class);
        intent.putExtra(FileDialog.START_PATH, "/sdcard");
        startActivityForResult(intent, SELECT_MULTI_FILE);
      }
    };
    
    // Create an anonymous implementation of OnClickListener
    OnClickListener multiDecryptButtonListner = new OnClickListener() {
      public void onClick(View v) {
        magicNamesVector.clear();
        lastEncrypt = false;
        magicNamesVector.clear();
        magicContext = v.getContext();
        // in onCreate or any event where your want the user to
        Intent intent = new Intent(v.getContext(), FileDialog.class);
        intent.putExtra(FileDialog.START_PATH, "/sdcard");
        startActivityForResult(intent, SELECT_MULTI_FILE);
      }
    };

    Button meButton = (Button) findViewById(R.id.multiencryptbutton);
    meButton.setOnClickListener(multiEncryptButtonListner);

    Button mdButton = (Button) findViewById(R.id.multidecryptbutton);
    mdButton.setOnClickListener(multiDecryptButtonListner);


    Button loadButton = (Button) findViewById(R.id.loadButton);
    loadButton.setOnClickListener(loadButtonListner);

    Button saveButton = (Button) findViewById(R.id.encryptbutton);
    saveButton.setOnClickListener(saveButtonListner);

    Button decryptButton = (Button) findViewById(R.id.decryptbutton);
    decryptButton.setOnClickListener(decryptButtonListener);

    // Look up the AdView as a resource and load a request.
    AdView adView = (AdView) this.findViewById(R.id.adView);
    adView.loadAd(new AdRequest());

  }
  

  public void scrambleFile(Boolean descramble) {

    // get a handle to the name
    // read in .old file
    // write out file
    // delete .old file?

    // rename file to .old
    String fileString = filePath;
    File oldfile = new File(fileString);
    File newfile = new File(fileString + ".old");
    oldfile.renameTo(newfile);


    // now try to open the first output file

    
    if (descramble == true) {

      SimpleCrypto crypto = new SimpleCrypto();
      try {
        Boolean madeit = crypto.decryptFile(newfile,oldfile,password);
      } catch (InvalidKeyException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
      newfile.delete();
      Toast.makeText(getBaseContext(), "Decrypted " + fileString,
          Toast.LENGTH_SHORT).show();
    } else {
      SimpleCrypto crypto  = new SimpleCrypto();
      try {
        Boolean madeit = crypto.encryptFile(newfile,oldfile,password);
      } catch (InvalidKeyException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }

      newfile.delete();
      Toast.makeText(getBaseContext(), "Encrypted " + fileString,
          Toast.LENGTH_SHORT).show();
    }

  }

  public String getFileName() {
    int slashloc = filePath.lastIndexOf("/");
    if (slashloc < 0) {
      return filePath;
    } else {
      return filePath.substring(slashloc + 1);
    }
  }

  public void onActivityResult(final int requestCode, int resultCode,
      final Intent data) {
    if (resultCode == RESULT_OK) {
      if (requestCode == SELECT_FILE) {
        filePath = data.getStringExtra(FileDialog.RESULT_PATH);
        // set the filename txt
        changeFileNameText(filePath);
        Button enabButton = (Button) findViewById(R.id.encryptbutton);
        enabButton.setEnabled(true);
        enabButton = (Button) findViewById(R.id.decryptbutton);
        enabButton.setEnabled(true);
      }
      else if(requestCode == SELECT_MULTI_FILE) {
        filePath = data.getStringExtra(FileDialog.RESULT_PATH);
        askForAnother(filePath);
      }
    } else if (resultCode == RESULT_CANCELED) {
    }
  }
  
  public void askForAnother(String newPath) {
    magicNamesVector.add(newPath);

    AlertDialog.Builder alert = new AlertDialog.Builder(magicContext);
    alert.setTitle("Add Another?");
    alert.setMessage("You Just Added " + newPath + ", which makes "
        + magicNamesVector.size() + " items, add another?");

    // Set an EditText view to get user input
    // final EditText input = new EditText(context);
    // input.setInputType(InputType.TYPE_CLASS_NUMBER);
    // input.setText("1");
    // alert.setView(input);

    alert.setPositiveButton("YES", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int whichButton) {
        Intent intent = new Intent(magicContext, FileDialog.class);
        intent.putExtra(FileDialog.START_PATH, "/sdcard");
        startActivityForResult(intent, SELECT_MULTI_FILE);
      }

    });

    alert.setNegativeButton("NO", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int whichButton) {
        dialog.dismiss();
        askToJoin();
      }
    });

    alert.show();

  }
  
  public void askToJoin() {

    AlertDialog.Builder alert = new AlertDialog.Builder(magicContext);
    String choiseString = "";
    if(lastEncrypt == true) {
      choiseString = "Encrypt";
    }
    else {
      choiseString = "Decrypt";
    }
    
    alert.setTitle(choiseString +" Files?");
    alert.setMessage(choiseString + " The Following Files?");

    // Set an EditText view to get user input
    final EditText input = new EditText(magicContext);
    input.setEnabled(false);
    input.setLines(10);
    input.setVerticalScrollBarEnabled(true);

    String alertBoxString = "";

    for (int i = 0; i < magicNamesVector.size(); i++) {
      try {
        alertBoxString += magicNamesVector.get(i) + "\n";
      } catch (Exception e) {

      }
    }
    input.setText(alertBoxString);
    alert.setView(input);

    alert.setPositiveButton("YES", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int whichButton) {

        magicJoin();
        dialog.dismiss();
      }

    });

    alert.setNegativeButton("NO", new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int whichButton) {
        dialog.dismiss();
        magicNamesVector.clear();
      }
    });

    alert.show();

  }


  public void changeFileNameText(String newFileName) {
    TextView t = (TextView) findViewById(R.id.fileText);
    t.setText(newFileName);
  }
  
  public void magicJoin() {
    // do something when the button is clicked
    AlertDialog.Builder alert = new AlertDialog.Builder(
        magicContext);

    alert.setTitle("Password");
    alert.setMessage("Please Enter A Password For Files");

    // Set an EditText view to get user input
    final EditText input = new EditText(magicContext);
    alert.setView(input);

    alert.setPositiveButton("Ok",
        new DialogInterface.OnClickListener() {
          public void onClick(DialogInterface dialog,
              int whichButton) {
            String tempName = input.getText().toString();

            if (tempName.length() > 0) {
              password = tempName;
              magicJoinStageTwo();
            } else {
              Toast.makeText(getBaseContext(),
                  "Invalid Password!",
                  Toast.LENGTH_LONG).show();
            }
          }

        });

    alert.setNegativeButton("Cancel",
        new DialogInterface.OnClickListener() {
          public void onClick(DialogInterface dialog,
              int whichButton) {
            // Canceled.
            magicNamesVector.clear();
          }
        });

    alert.show();
  }
  
  public void magicJoinStageTwo() {
    for(int i = 0;i < magicNamesVector.size();i++) {
      try {
        filePath = (String) magicNamesVector.get(i);
      } catch (Exception e) {
        return;
      }
      if(lastEncrypt == true) {
        scrambleFile(false);
      }
      else {
        scrambleFile(true);
      }
    }
  }

}

Java Source Code List

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