Android™

Everyware API RSA Encrypt JSON

See more RSA Examples

Demonstrates how to RSA encrypt JSON using everyware.com's RSA public key. 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);

    boolean success = false;

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

    // First build the JSON to be encrypted.
    CkJsonObject json = new CkJsonObject();
    json.UpdateString("provider_key","USER GUID HERE");
    json.UpdateString("menu_item","payment");
    CkDateTime dt = new CkDateTime();
    dt.SetFromCurrentSystemTime();
    json.UpdateString("date_time",dt.getAsUnixTimeStr(false));

    // This build JSON like the following:

    // {
    //     "provider_key": "USER GUID HERE",
    //     "menu_item": "payment",
    //     "date_time": "1588163411"
    // }

    // When we sign, we'll want to sign the most compact JSON possible
    json.put_EmitCompact(true);

    // Everyware's RSA public key is at:  https://docs.everyware.com/docs/everyware-public-rsa-key
    CkStringBuilder sb = new CkStringBuilder();
    boolean bCrlf = true;
    sb.AppendLine("-----BEGIN PUBLIC KEY-----",bCrlf);
    sb.AppendLine("MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAxNbflxUSWQ3XJ1N9dAoh",bCrlf);
    sb.AppendLine("k+uaiFsg3wkPi9LGS/mH8DtHBgZxKyz+oQBDtnDd9FDEo0ql7MMgCMsTAv27W5vk",bCrlf);
    sb.AppendLine("Pu0rm6zhcTeYquWEuVCS7VtVsyTATr0Z9WhqNeZlIRurovJAXl2jRDX6QeY5dayC",bCrlf);
    sb.AppendLine("ubwyG4lBWE4fCakGY6zlh+oaElK0rvblqjYoEg3dn4KPRCYGof8OFxLptHThD4cE",bCrlf);
    sb.AppendLine("T30j+utVafhO0HRyJ4iR3Pigb4GXdWBtJEEEWddZJizMkjFQkyUAoYLOT8EJ2TW3",bCrlf);
    sb.AppendLine("Tz8SvAuHBUEFcPWTSTMAG/bSp5wrYBTXaeEhx+wrYa60OruHuzgmhzKyQVuYlCNJ",bCrlf);
    sb.AppendLine("HdbnassuIRjjSNo25o4AdSlWwpGfBZjAiyEInR+KGpHdhKTxSekJxiwiXUS0UfSG",bCrlf);
    sb.AppendLine("prOpd5PzWaAR7DvjLsdmR9XffxvJCVxC735gLK7hDJKjCajDPHVDr8FSL8xMlrq0",bCrlf);
    sb.AppendLine("nKxtsHeRl1yzoGrRr12+9MiQnHtpqROTNXcXdwe3v+Vh8V5k8v8oIrcgh1+/N7Bd",bCrlf);
    sb.AppendLine("NiRsy1gFHBdu/he/KcDRT/9/acQFMPLQueGfZxUvU5As6pEONjtKX2MUg2fMF6Rc",bCrlf);
    sb.AppendLine("sQVVrLzg0g7EcuHGfuPeKfD/716MvS8NU7rX+2soijCSQv/e18PJPMVDlcMXjnup",bCrlf);
    sb.AppendLine("PPx1tStemesavFlj1okhS6UCAwEAAQ==",bCrlf);
    sb.AppendLine("-----END PUBLIC KEY-----",bCrlf);

    CkPublicKey pubkey = new CkPublicKey();
    success = pubkey.LoadFromString(sb.getAsString());
    if (success == false) {
        Log.i(TAG, pubkey.lastErrorText());
        return;
        }

    CkRsa rsa = new CkRsa();
    success = rsa.UsePublicKey(pubkey);
    if (success == false) {
        Log.i(TAG, rsa.lastErrorText());
        return;
        }

    // We probably need a base64Url encoded encrypted key.
    // Using straight-up base64 would potenially include chars that are not URL safe (i.e. have special meanings in URLs)
    rsa.put_EncodingMode("base64url");

    String encryptedJson = rsa.encryptStringENC(json.emit(),false);

    // Build the URL
    // Such as:  https://portal.everyware.com/Account/LoginMenu?data={Base64Url_encrypted_JSON}
    CkStringBuilder sbUrl = new CkStringBuilder();
    sbUrl.Append("https://portal.everyware.com/Account/LoginMenu?data=");
    sbUrl.Append(encryptedJson);

    Log.i(TAG, sbUrl.getAsString());

  }

  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."
  }
}