Android™

PBKDF1 - Derive Key from Password

See more Encryption Examples

Demonstrates how to derive a symmetric encryption key from a password using PBKDF1. This example matches the results found at this URL: http://www.di-mgt.com.au/cryptoKDFs.html#examplespbkdf

It also matches the output produced by the .NET Framework using this C# code:

            byte[] salt = new byte[] { 0x78, 0x57, 0x8E, 0x5A, 0x5D, 0x63, 0xCB, 0x06 };
            PasswordDeriveBytes cdk = new PasswordDeriveBytes("password", salt);

            cdk.IterationCount = 1000;
            cdk.HashName = "SHA1";

            // generate a 16-byte key
            byte[] key = cdk.GetBytes(16);

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 hexKey;
    // http://www.di-mgt.com.au/cryptoKDFs.html#examplespbkdf

    String pw = "password";
    String pwCharset = "ansi";
    // Hash algorithms may be: sha1, md2, md5, etc.
    String hashAlg = "sha1";
    // The salt should be 8 bytes:
    String saltHex = "78578E5A5D63CB06";
    int iterationCount = 1000;
    // Derive a 128-bit key from the password.
    int outputBitLen = 128;

    // 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";

    hexKey = crypt.pbkdf1(pw,pwCharset,hashAlg,saltHex,iterationCount,outputBitLen,enc);

    Log.i(TAG, hexKey);

    // The output should have this value:
    // DC19847E05C64D2FAF10EBFB4A3D2A2

  }

  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."
  }
}