Android Open Source - SimpleDataEncryptor Data Encryptor

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * /*from w  w  w .j a  v a  2  s  . c  o  m*/
 * this class is meant to encrypt and decrypt user info before storing it
 * into shared prefrences.
 * Singleton approach is followed to design this class
 * 
 */

package my.rajiv.dataencryptor;

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import android.util.Base64;

public class DataEncryptor {

  private KeyGenerator mKeyGenerator;
  private SecretKey mSecretKey;

  private String mSecretString;

  Cipher desCipher;

  private DataEncryptor(String secretKey) {
    try {
      mKeyGenerator = KeyGenerator.getInstance("DES");
      mSecretString = secretKey;
      mSecretKey = new SecretKeySpec(mSecretString.getBytes("UTF8"),
          "DES");

      desCipher = Cipher.getInstance("DES/ECB/PKCS5Padding");

    } catch (NoSuchAlgorithmException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (NoSuchPaddingException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }

    // Create the cipher
  }

  public String getEncryptedData(String text) {
    if (text != null) {
      byte[] textEncrypted = null;

      try {
        desCipher.init(Cipher.ENCRYPT_MODE, mSecretKey);
        textEncrypted = Base64.encode(
            desCipher.doFinal(text.getBytes("UTF-8")),
            Base64.DEFAULT);
        return new String(textEncrypted);
      } catch (InvalidKeyException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (IllegalBlockSizeException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (BadPaddingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (UnsupportedEncodingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }
    return null;
  }

  public String getDecryptedData(String text) {
    if (text != null) {
      byte[] textDecrypted = null;
      try {
        desCipher.init(Cipher.DECRYPT_MODE, mSecretKey);
        textDecrypted = desCipher.doFinal(Base64.decode(
            text.getBytes("UTF-8"), Base64.DEFAULT));// text.getBytes("UTF-8"));
        return new String(textDecrypted);
      } catch (InvalidKeyException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (IllegalBlockSizeException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (BadPaddingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (UnsupportedEncodingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
    }
    return null;
  }

  private static DataEncryptor mDataEncryptor = null;

  public static DataEncryptor getDataEncryptor(String secretKey) {

    if (mDataEncryptor == null) {
      mDataEncryptor = new DataEncryptor(secretKey);
    }
    return mDataEncryptor;

  }

}

Java Source Code List

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