Android™

ARC4 PRNG (Pseudo Random Number Generator)

See more Encryption Examples

Uses the ARC4 stream encryption algorithm as a pseudo random number generator. 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 requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkCrypt2 crypt = new CkCrypt2();

    // Set the encryption algorithm to ARC4:	
    crypt.put_CryptAlgorithm("arc4");

    // We want the encrypted output to be a hex-encoded string.
    crypt.put_EncodingMode("hex");

    String key = "000102030405060708090A0B0C0D0E0F";
    String data = "12345678";

    // Key length is 128 bits in this example.
    crypt.put_KeyLength(128);
    crypt.SetEncodedKey(key,"hex");

    // Generate 16 "random" 8-byte blocks, encoded as hex strings.
    // This example will generate the identical output each time
    // it is run.
    String cipherHex;
    int i;
    for (i = 0; i <= 15; i++) {
        cipherHex = crypt.encryptStringENC(data);
        Log.i(TAG, data);
        Log.i(TAG, cipherHex);
        data = cipherHex;
        }


  }

  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."
  }
}