(Android™) IKOF Generation Code for Montenegro Fiscalization Service

Demonstrates computing the IKOF MD5 summary value as described in section 4.3 of this document: https://poreskauprava.gov.me/ResourceManager/FileDownload.aspx?rId=416042&rType=2

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.

    String concatenatedParams = "12345678|2019-06-12T17:05:43+02:00|9952|bb123bb1231|cc123cc1231|ss123ss123|199.01";

    // Get the private key from a pfx file.
    CkPfx pfx = new CkPfx();
    boolean success = pfx.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123");
    if (success != true) {
        Log.i(TAG, pfx.lastErrorText());
        return;
        }

    CkPrivateKey privKey = pfx.GetPrivateKey(0);
    if (pfx.get_LastMethodSuccess() == false) {
        Log.i(TAG, pfx.lastErrorText());
        return;
        }

    // Create IIC signature according to RSASSA-PKCS-v1_5 using SHA256
    CkRsa rsa = new CkRsa();
    success = rsa.ImportPrivateKeyObj(privKey);
    if (success == false) {
        Log.i(TAG, rsa.lastErrorText());
        return;
        }

    // PKCS-v1_5 is used by default.
    rsa.put_EncodingMode("hex");
    rsa.put_Charset("utf-8");
    String hexSig = rsa.signStringENC(concatenatedParams,"sha256");

    Log.i(TAG, "Signature value result is: " + hexSig);

    // Compute the MD5 hash of the bytes.
    CkCrypt2 crypt = new CkCrypt2();
    crypt.put_EncodingMode("hex");
    crypt.put_HashAlgorithm("md5");
    CkBinData bd = new CkBinData();
    bd.AppendEncoded(hexSig,"hex");
    String md5_summary = crypt.hashBdENC(bd);

    Log.i(TAG, "MD5 summary value is: " + md5_summary);


  }

  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."
  }
}