Android™

PBKDF2 Key Derivation

Demonstrates AES secret key derivation from a password using PBDKF2. Android™

// 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();

    String password = "correcthorsebatterystaple";

    //  Derive from the utf-8 byte representation of the password.
    String charset = "utf-8";

    String hashAlg = "sha256";

    crypt.put_EncodingMode("hex");
    String saltHex = crypt.genRandomBytesENC(16);

    int iterationCount = 310000;

    //  Derive a 256-bit key from the password.
    int outputBitLen = 256;

    //  The derived key is returned as a hex or base64 encoded string.
    //  (Note: The salt argument must be a string that also uses
    //  the same encoding.)
    String enc = "hex";

    String hexKey = crypt.pbkdf2(password,charset,hashAlg,saltHex,iterationCount,outputBitLen,enc);

    Log.i(TAG, hexKey);

    //  Sample output:
    //  597734C894FF89CFD3B93D925462C24E97724BCB118F6FC919007F5ABC27E768

  }

  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."
  }
}