(Android™) Get ETK Public Key (api-acpt.ehealth.fgov.be)

See more Belgian eHealth Platform Examples

The following URL returns JSON, which contains a PKCS7 signed data:

https://api-acpt.ehealth.fgov.be/etee/v1/etks?identifier=12345678901&type=SSIN

This example extracts the signed data, validates it, and then extracts the public key from the certificate (obtained from signed content in the PKCS7)

Note: The URL above uses "12345678901" which is not valid. You should replace it with a valid number.

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.

    CkHttp http = new CkHttp();

    String jsonStr = http.quickGetStr("https://api-acpt.ehealth.fgov.be/etee/v1/etks?identifier=12345678901&type=SSIN");
    if (http.get_LastMethodSuccess() == false) {
        Log.i(TAG, http.lastErrorText());
        return;
        }

    Log.i(TAG, jsonStr);

    // The JSON contains something like this:

    // [
    //     {
    //         "key": {
    //             "applicationIdentifier": "",
    //             "ssin": "12345678901"
    //         },
    //         "value": "MIAGCSq....AAAAAAAA=="
    //     }
    // ]

    // Note: The above is a JSON array (not a JSON object)
    // It should be loaded into a Chilkat JSON array.
    CkJsonArray jarr = new CkJsonArray();
    boolean success = jarr.Load(jsonStr);
    if (success == false) {
        Log.i(TAG, "Failed to load JSON.");
        return;
        }

    CkJsonObject json = jarr.ObjectAt(0);
    CkBinData bdPkcs7 = new CkBinData();
    bdPkcs7.AppendEncoded(json.stringOf("value"),"base64");

    // Let's verify the PKCS7, and then examine the signing cert,
    // and get the signing cert's public key.
    CkCrypt2 crypt = new CkCrypt2();

    // Validate the signedData PKCS7, and replace the contents of bdPkcs7 with the extracted signed content.
    success = crypt.OpaqueVerifyBd(bdPkcs7);
    if (success == false) {
        Log.i(TAG, crypt.lastErrorText());
        return;
        }

    // The signed content is the DER of a certificate.
    // In other words, bdPkcs7 now contains a certificate.
    CkCert cert = new CkCert();
    success = cert.LoadFromBd(bdPkcs7);
    if (success == false) {
        Log.i(TAG, cert.lastErrorText());
        return;
        }

    // Show some certificate information:
    Log.i(TAG, "Subject: " + cert.subjectDN());
    Log.i(TAG, "Serial: " + cert.serialNumber());
    Log.i(TAG, "Issuer: " + cert.issuerDN());

    // Let's get the cert's public key...
    CkPublicKey pubKey = cert.ExportPublicKey();
    if (cert.get_LastMethodSuccess() == false) {
        Log.i(TAG, cert.lastErrorText());
        return;
        }

    // OK, you now have the public key and can do whatever is needed..
    Log.i(TAG, pubKey.keyType());
    Log.i(TAG, String.valueOf(pubKey.get_KeySize()));


  }

  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."
  }
}