(Android™) Example: Crypt2.GenRandomBytesENC method

Shows how to use the GenRandomBytesENC method to generate a specified number of random bytes and return them as a binary encoded string, such as in base64 or hex format.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// 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);

    CkCrypt2 crypt = new CkCrypt2();

    // Example of a some of the binary encodings supported by Chilkat.

    // Internally uses the Fortuna cryptographically secure random number generation algorithm
    // auto-seeded from a secure source of entropy that depends on the OS.

    crypt.put_EncodingMode("hex");
    String s = crypt.genRandomBytesENC(8);
    Log.i(TAG, "Uppercase Hex: " + s);

    crypt.put_EncodingMode("hex_lower");
    s = crypt.genRandomBytesENC(8);
    Log.i(TAG, "Lowercase Hex: " + s);

    crypt.put_EncodingMode("base64");
    s = crypt.genRandomBytesENC(8);
    Log.i(TAG, "Base64: " + s);

    crypt.put_EncodingMode("base64url");
    s = crypt.genRandomBytesENC(8);
    Log.i(TAG, "Base64Url: " + s);

    crypt.put_EncodingMode("base58");
    s = crypt.genRandomBytesENC(8);
    Log.i(TAG, "Base58: " + s);

    crypt.put_EncodingMode("base32");
    s = crypt.genRandomBytesENC(8);
    Log.i(TAG, "Base32: " + s);

    crypt.put_EncodingMode("decList");
    s = crypt.genRandomBytesENC(8);
    Log.i(TAG, "Decimal List: " + s);

    // Sample Output:

    // Uppercase Hex: 1BA0E87915C3B429
    // Lowercase Hex: 1e1638a1c7996c58
    // Base64: 1lV0I/su5lg=
    // Base64Url: Zq7DU0nukLk
    // Base58: foUVWUjAT6e
    // Base32: LHV5RV4HRCLW2===
    // Decimal List: 168,55,214,82,93,154,191,164

  }

  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."
  }
}