(Android™) PBES2 Password-Based Encryption (PBE)

Demonstrates how to implement password-based encryption according to the PKCS #5 v2.0: Password-Based Cryptography Standard (published by RSA Laboratories). This example uses PBES2, which ise based on the PBKDF2 function and an underlying block cipher such as RC2, DES, etc.

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// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkCrypt2 crypt = new CkCrypt2();

    // Set properties for PBES2 encryption:

    crypt.put_CryptAlgorithm("pbes2");
    crypt.put_PbesPassword("mySecretPassword");

    // Set the underlying PBE algorithm (and key length):
    crypt.put_PbesAlgorithm("rc2");
    crypt.put_KeyLength(128);
    // Only required for the RC2 algorithm:
    crypt.put_Rc2EffectiveKeyLength(128);

    // By definition, the block encryption algorithm (RC2 or whichever
    // was selected) will run in CBC mode.  Therefore, we need
    // an IV.  The IV is equal in length to the block size of the
    // algorithm.  RC2 has a block size of 8 bytes (regardless of
    // key length), so set the IV to some value that is 8 bytes 
    // in length:
    crypt.SetEncodedIV("0000000000000000","hex");

    // Give it some salt:
    crypt.SetEncodedSalt("0102030405060708","hex");

    // A higher iteration count makes the algorithm more
    // computationally expensive and therefore exhaustive
    // searches (for breaking the encryption) is more difficult:
    crypt.put_IterationCount(1024);

    // A hash algorithm needs to be set for PBES2:
    crypt.put_HashAlgorithm("sha1");

    // Indicate that the encrypted bytes should be returned
    // as a hex string:
    crypt.put_EncodingMode("hex");

    String plainText = "To be encrypted.";

    String encryptedText = crypt.encryptStringENC(plainText);

    Log.i(TAG, encryptedText);

    // Now decrypt:
    String decryptedText = crypt.decryptStringENC(encryptedText);

    Log.i(TAG, decryptedText);

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}