Android Open Source - Kryptomate Krypto Activity

• Back to App/text  ↑

From Project

Back to project page Kryptomate.

License

The source code is released under:

Copyright (c) 2013, Sebastian J. Mielke All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are ...

Java Source Code

/*******************************************************************************
Copyright (c) 2013, Sebastian J. Mielke/*from   ww w . ja va2s .c  o  m*/
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this
    list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation
    and/or other materials provided with the distribution.
  * The names of its contributors may not be used to endorse or promote products
    derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*******************************************************************************/

package de.sjmmusic.kryptomate;

import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.text.Editable;
import android.text.InputFilter;
import android.text.InputType;
import android.text.Spanned;
import android.text.TextWatcher;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.*;

public class KryptoActivity extends Activity implements InputFilter, TextWatcher {

  ToggleButton tgMethod, tgMode;
  SeekBar sbShift;
  EditText edInput, edOutput, edKey;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    tgMode = (ToggleButton) findViewById(R.id.tgMode);
    tgMethod = (ToggleButton) findViewById(R.id.tgMethod);
    sbShift = (SeekBar) findViewById(R.id.sbShift);
    edInput = (EditText) findViewById(R.id.edInput);
    edOutput = (EditText) findViewById(R.id.edOutput);
    edKey = (EditText) findViewById(R.id.edKey);
    
    sbShift.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
        @Override
        public void onProgressChanged(SeekBar seekBar, int progress,
            boolean fromUser) {
          refreshResult();
        }
        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {}
        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {}
      });

    tgMethod.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
      @Override
      public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        edKey.setVisibility(isChecked ? View.VISIBLE : View.GONE);
        sbShift.setVisibility(isChecked ? View.GONE : View.VISIBLE);
        refreshResult();
      }
    });

    tgMode.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
      @Override
      public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        refreshResult();
      }
    });

    OnClickListener aboutClick = new OnClickListener(){
      @Override
      public void onClick(View v) {
        AlertDialog dialog = new AlertDialog.Builder(KryptoActivity.this)
          .setTitle(getString("about_title"))
          .setPositiveButton("OK", null)
          .setCancelable(true)
          .setMessage(getString("about_message"))
          .show();
        ((TextView) dialog.findViewById(android.R.id.message)).setTextSize(14);
      }
    };

    ((TextView) findViewById(R.id.lbWelcome)).setOnClickListener(aboutClick);
    ((TextView) findViewById(R.id.lbAbout)).setOnClickListener(aboutClick);

    edInput.addTextChangedListener(this);
    edKey.addTextChangedListener(this);
    edKey.setFilters(new InputFilter[]{this});
    tgMethod.setChecked(true);
    tgMethod.toggle();
    tgMode.toggle();
  }

  @Override
  public CharSequence filter(CharSequence source, int start,
      int end, Spanned dest, int dstart, int dend) {
    for (int i = start; i < end; i++) {
      if (!Character.isLetter(source.charAt(i)))
        return "";
      else if (Character.isLowerCase(source.charAt(i)))
        return "" + Character.toUpperCase(source.charAt(i));
    }
    return null;
  }

  @Override
  public void onTextChanged(CharSequence s, int start, int before, int count) {
    refreshResult();
  }
  
  @Override
  public void beforeTextChanged(CharSequence s, int start, int count,
      int after) {}
  
  @Override
  public void afterTextChanged(Editable s) {}
  
  public void refreshResult() {
    if(!tgMethod.isChecked()) //Caesar
    {
      tgMode.setTextOn("Encrypt (" + String.valueOf(sbShift.getProgress()) + ")");
      tgMode.setTextOff("Decrypt (" + String.valueOf(sbShift.getProgress()) + ")");
      tgMode.setText((tgMode.isChecked() ? "Encrypt (" : "Decrypt(")
          + String.valueOf(sbShift.getProgress()) + ")");
      edOutput.setText(caesar(edInput.getText().toString(),
          sbShift.getProgress() * (tgMode.isChecked() ? 1 : -1)));
    } else { //Vigenere
      tgMode.setTextOn("Encrypt");
      tgMode.setTextOff("Decrypt");
      tgMode.setText(tgMode.isChecked() ? "Encrypt" : "Decrypt");
      edOutput.setText(vigenere(edInput.getText().toString(),
          edKey.getText().toString(), (tgMode.isChecked() ? 1 : -1)));
    }
  }
  
  public static String caesar(String input, int shift) {
    String output = "";
    int a;
    for (int i = 0; i < input.length(); i++){
      a = input.charAt(i);
      if(a < 65 || a > 122 || (a > 90 && a < 97)) //Non-Alphabetical
        output += (char) a;
      else if (a >= 65 && a <= 90) { //Uppercase
        a += shift;
        if (a < 65) a += 26;
        if (a > 90) a -= 26;
        output += (char) a;
      }
      else { //Lowercase
        a += shift;
        if (a < 97) a += 26;
        if (a > 122) a -= 26;
        output += (char) a;
      }
    }
    return output;
  }

  public static String vigenere (String input, String key, int crypt) {
    if (key.length() == 0) return "";
    String output = "";
    int a, k;
    for (int i = 0; i < input.length(); i++){
      a = input.charAt(i);
      k = crypt * (key.charAt(i % key.length()) - 65);
      if(a < 65 || a > 122 || (a > 90 && a < 97)) //Non-Alphabetical
        output += (char) a;
      else if (a >= 65 && a <= 90) { //Uppercase
        a += k;
        if (a < 65) a += 26;
        if (a > 90) a -= 26;
        output += (char) a;
      }
      else { //Lowercase
        a += k;
        if (a < 97) a += 26;
        if (a > 122) a -= 26;
        output += (char) a;
      }
    }
    return output;
  }

  public String getString(String name)
  {
    try {
      return getResources().getString(
          getResources().getIdentifier(
              name, "string", "de.sjmmusic.kryptomate"));
    } catch (Exception e) {
      return e.getMessage();
    }
  }

}

Java Source Code List

• Back to App/text  ↑