(Android™) Encrypt / Decrypt Secure Strings

Demonstrates how to use the EncryptSecureENC and DecryptSecureENC methods to encrypt/decrypt secure strings. These methods were added in Chilkat v9.5.0.71 (released January 2018).

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);

    //  This example requires the Chilkat Crypt API to have been previously unlocked.
    //  See Unlock Chilkat Crypt for sample code.

    //  Load the secure string with some text.
    CkSecureString secStr1 = new CkSecureString();
    boolean success = secStr1.LoadFile("qa_data/txt/helloWorld.txt","utf-8");
    if (success != true) {
        Log.i(TAG, "Failed to load helloWorld.txt");
        return;
        }

    CkCrypt2 crypt = new CkCrypt2();

    crypt.put_CryptAlgorithm("aes");
    crypt.put_CipherMode("cbc");
    crypt.put_KeyLength(128);
    crypt.SetEncodedKey("000102030405060708090A0B0C0D0E0F","hex");
    crypt.SetEncodedIV("000102030405060708090A0B0C0D0E0F","hex");
    crypt.put_EncodingMode("base64");

    //  Return the base64 encoded encrypted contents of secStr1.
    String encryptedStr = crypt.encryptSecureENC(secStr1);
    Log.i(TAG, "Encrypted string: " + encryptedStr);

    //  Output:
    //  Encrypted string: qiq+IFhcjTkEIkZyf31V/g==

    //  Decrypt to secStr2:
    CkSecureString secStr2 = new CkSecureString();
    crypt.DecryptSecureENC(encryptedStr,secStr2);

    //  Access the contents of secStr2
    Log.i(TAG, "Decrypted string: " + secStr2.access());

    //  Output:
    //  Decrypted string: Hello World!

  }

  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."
  }
}