(Android™) Encrypting or Hashing Hex or Base64 Encoded Binary Data

This example demonstrates how to encrypt binary input data that is in an encoded string form, such as "hex" or "base64". The goal is to do the following:

1. Decode the input to get the binary data to be hashed or encrypted.
2. Hash or encrypt.
3. Encode the result and return as a hex or base64 encoded string.

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

    CkCrypt2 crypt = new CkCrypt2();

    String sHexBinary = "9D4203A3FF07791A1CD7FB0075D179E14E8B9DBEBFDE24F6D04613B8397B328E";

    // The input is hex-encoded binary data, so set the Charset property = "hex"
    // The Charset can also be "base64".
    crypt.put_Charset("hex");
    // The output will be encoded to hex also.
    crypt.put_EncodingMode("hex");

    crypt.put_HashAlgorithm("ripemd160");
    String hash = crypt.hashStringENC(sHexBinary);
    Log.i(TAG, "RIPEMD160: " + hash);

    // Important: This example requires Chilkat v9.5.0.49 or greater to work correctly.

    // The same can be accomplished w/ encryption:	
    crypt.put_CryptAlgorithm("aes");
    crypt.put_CipherMode("cbc");
    crypt.put_KeyLength(256);
    crypt.put_PaddingScheme(0);

    crypt.put_Charset("hex");
    crypt.put_EncodingMode("hex");

    String ivHex = "000102030405060708090A0B0C0D0E0F";
    crypt.SetEncodedIV(ivHex,"hex");

    String keyHex = "000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F";
    crypt.SetEncodedKey(keyHex,"hex");

    String encStr = crypt.encryptStringENC(sHexBinary);
    Log.i(TAG, encStr);

    // Important: This example requires Chilkat v9.5.0.49 or greater to work correctly.
    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."
  }
}