(Android™) 56-bit DES Encryption, ECB, CBC modes

Demonstrates the older 56-bit DES encryption in ECB and CBC modes.

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 assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkCrypt2 crypt = new CkCrypt2();

    // Specify DES for the encryption algorithm:
    crypt.put_CryptAlgorithm("des");

    // CipherMode may be "ecb" or "cbc"
    crypt.put_CipherMode("cbc");

    // Keylength is 64 bits (56 bits + 8 parity bits)
    crypt.put_KeyLength(64);

    // The padding scheme determines the contents of the bytes
    // that are added to pad the result to a multiple of the
    // encryption algorithm's block size.  DES has a block
    // size of 8 bytes, so encrypted output is always
    // a multiple of 8.
    crypt.put_PaddingScheme(0);

    // EncodingMode specifies the encoding of the output for
    // encryption, and the input for decryption.
    // It may be "hex", "url", "base64", or "quoted-printable".
    crypt.put_EncodingMode("hex");

    // An initialization vector is required if using CBC or CFB modes.
    // ECB mode does not use an IV.
    // The length of the IV is equal to the algorithm's block size.
    // It is NOT equal to the length of the key.
    String ivHex = "0001020304050607";
    crypt.SetEncodedIV(ivHex,"hex");

    // The secret key must equal the size of the key.  For 
    // DES, the key must be 8 bytes (i.e. 64-bits).
    String keyHex = "0001020304050607";
    crypt.SetEncodedKey(keyHex,"hex");

    // Encrypt a string...
    // The input string is 44 ANSI characters (i.e. 44 bytes), so
    // the output should be 48 bytes (a multiple of 8).
    // Because the output is a hex string, it should
    // be 96 characters long (2 chars per byte).
    String encStr = crypt.encryptStringENC("The quick brown fox jumps over the lazy dog.");
    Log.i(TAG, encStr);

    // Now decrypt:
    String decStr = crypt.decryptStringENC(encStr);
    Log.i(TAG, decStr);

  }

  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."
  }
}