Android™

2-Key Triple DES (112 bits)

See more Encryption Examples

Demonstrates 2-Key Triple DES encryption (112-bit 3DES encryption). 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();

    // Specify 3DES for the encryption algorithm:
    crypt.put_CryptAlgorithm("3des");

    crypt.put_CipherMode("ecb");

    // For 2-Key Triple-DES, use a key length of 128
    // (Given that each byte's msb is a parity bit, the strength is really 112 bits).
    crypt.put_KeyLength(128);

    // Pad with zeros
    crypt.put_PaddingScheme(3);

    // 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");

    // Let's create a secret key by using the MD5 hash of a password.
    // The Digest-MD5 algorithm produces a 16-byte hash (i.e. 128 bits)
    crypt.put_HashAlgorithm("md5");
    String keyHex = crypt.hashStringENC("secretPassword");

    // Set the encryption key:
    crypt.SetEncodedKey(keyHex,"hex");

    // Encrypt
    String encStr = crypt.encryptStringENC("The quick brown fox jumped 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."
  }
}