(Android™) Load RSA Private Key from JWK Format (JSON Web Key)

Demonstrates how to load an RSA private key from JWK (JSON Web Key) format.

Note: This example requires Chilkat v9.5.0.66 or later.

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);

    // Note: This example requires Chilkat v9.5.0.66 or later.
    boolean success;

    // First build a JWK sample to load..
    CkJsonObject json = new CkJsonObject();
    json.UpdateString("kty","RSA");
    json.UpdateString("n","33TqqLR3eeUmDtHS89qF3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA04DDnEFGAf-kDQiNSe2ZtqC7bnIc8-KSG_qOGQIVaay4Ucr6ovDkykO5Hxn7OU7sJp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwFwnxCsU5-UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUEf0YN3_Q0auBkdbDR_ES2PbgKTJdkjc_rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1WSw");
    json.UpdateString("e","AQAB");
    json.UpdateString("d","DjU54mYvHpICXHjc5-JiFqiH8NkUgOG8LL4kwt3DeBp9bP0-5hSJH8vmzwJkeGG9L79EWG4b_bfxgYdeNX7cFFagmWPRFrlxbd64VRYFawZHRJt-2cbzMVI6DL8EK4bu5Ux5qTiV44Jw19hoD9nDzCTfPzSTSGrKD3iLPdnREYaIGDVxcjBv3Tx6rrv3Z2lhHHKhEHb0RRjATcjAVKV9NZhMajJ4l9pqJ3A4IQrCBl95ux6Xm1oXP0i6aR78cjchsCpcMXdP3WMsvHgTlsZT0RZLFHrvkiNHlPiil4G2_eHkwvT__CrcbO6SmI_zCtMmypuHJqcr-Xb7GPJoa64WoQ");
    json.UpdateString("p","8K33pX90XX6PZGiv26wZm7tfvqlqWFT03nUMvOAytqdxhO2HysiPn4W58OaJd1tY4372Qpiv6enmUeI4MidCie-s-d0_B6A0xfhU5EeeaDN0xDOOl8yN-kaaVj9b4HDR3c91OAwKpDJQIeJVZtxoijxl-SRx3u7Vs_7meeSpOfE");
    json.UpdateString("q","7a5KnUs1pTo72A-JquJvIz4Eu794Yh3ftTk_Et-83aE_FVc6Nk-EhfnwYSNpVmM6UKdrAoy5gsCvZPxrq-eR9pEwU8M5UOlki03vWY_nqDBpJSIqwPvGHUB16zvggsPQUyQBfnN3N8XlDi12n88ltvWwEhn1LQOwMUALEfka9_s");
    json.UpdateString("dp","DB9nGuHplY_7Xv5a5UCs5YgxkWPtJFfbIZ1Zr-XHCCY09JIWReOGQG226OhjwixKtOK_OqmAKtMKM9OmKviJRHNbDhbTxumN3u7cL8dftjXpSryiEQlPmWyW94MneI2WNIrvh4wruQuDt8EztgOiDFxwcnUgey8iend7WmZnE7E");
    json.UpdateString("dq","O-bSTUQ4N_UuQezgkF3TDrnBraO67leDGwRbfiE_U0ghQvqh5DA0QSPVzlWDZc9KUitvj8vxsR9o1PW9GS0an17GJEYuetLnkShKK3NWOhBBX6d1yP9rVdH6JhgIJEy_g0Suz7TAFiFc8i7JF8u4QJ05C8bZAMhOLotqftQeVOM");
    json.UpdateString("qi","InfGmkb2jNkPGuNiZ-mU0-ZrOgLza_fLL9ErZ35jUPhGFzdGxJNobklvsNoTd-E2GAU41YkJh24bncMLvJVYxHHA5iF7FBWx1SvpEyKVhhnIcuXGD7N5PbNZzEdmr9C6I7cPVkWO-sUV7zfFukexIcANmsd_oBBGKRoYzP5Tti4");

    // The JSON contains the following:
    // { 
    //   "kty": "RSA",
    //   "n": "33TqqLR3eeUmDtHS89qF3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA04DDnEFGAf-kDQiNSe2ZtqC7bnIc8-KSG_qOGQIVaay4Ucr6ovDkykO5Hxn7OU7sJp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwFwnxCsU5-UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUEf0YN3_Q0auBkdbDR_ES2PbgKTJdkjc_rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1WSw",
    //   "e": "AQAB",
    //   "d": "DjU54mYvHpICXHjc5-JiFqiH8NkUgOG8LL4kwt3DeBp9bP0-5hSJH8vmzwJkeGG9L79EWG4b_bfxgYdeNX7cFFagmWPRFrlxbd64VRYFawZHRJt-2cbzMVI6DL8EK4bu5Ux5qTiV44Jw19hoD9nDzCTfPzSTSGrKD3iLPdnREYaIGDVxcjBv3Tx6rrv3Z2lhHHKhEHb0RRjATcjAVKV9NZhMajJ4l9pqJ3A4IQrCBl95ux6Xm1oXP0i6aR78cjchsCpcMXdP3WMsvHgTlsZT0RZLFHrvkiNHlPiil4G2_eHkwvT__CrcbO6SmI_zCtMmypuHJqcr-Xb7GPJoa64WoQ",
    //   "p": "8K33pX90XX6PZGiv26wZm7tfvqlqWFT03nUMvOAytqdxhO2HysiPn4W58OaJd1tY4372Qpiv6enmUeI4MidCie-s-d0_B6A0xfhU5EeeaDN0xDOOl8yN-kaaVj9b4HDR3c91OAwKpDJQIeJVZtxoijxl-SRx3u7Vs_7meeSpOfE",
    //   "q": "7a5KnUs1pTo72A-JquJvIz4Eu794Yh3ftTk_Et-83aE_FVc6Nk-EhfnwYSNpVmM6UKdrAoy5gsCvZPxrq-eR9pEwU8M5UOlki03vWY_nqDBpJSIqwPvGHUB16zvggsPQUyQBfnN3N8XlDi12n88ltvWwEhn1LQOwMUALEfka9_s",
    //   "dp": "DB9nGuHplY_7Xv5a5UCs5YgxkWPtJFfbIZ1Zr-XHCCY09JIWReOGQG226OhjwixKtOK_OqmAKtMKM9OmKviJRHNbDhbTxumN3u7cL8dftjXpSryiEQlPmWyW94MneI2WNIrvh4wruQuDt8EztgOiDFxwcnUgey8iend7WmZnE7E",
    //   "dq": "O-bSTUQ4N_UuQezgkF3TDrnBraO67leDGwRbfiE_U0ghQvqh5DA0QSPVzlWDZc9KUitvj8vxsR9o1PW9GS0an17GJEYuetLnkShKK3NWOhBBX6d1yP9rVdH6JhgIJEy_g0Suz7TAFiFc8i7JF8u4QJ05C8bZAMhOLotqftQeVOM",
    //   "qi": "InfGmkb2jNkPGuNiZ-mU0-ZrOgLza_fLL9ErZ35jUPhGFzdGxJNobklvsNoTd-E2GAU41YkJh24bncMLvJVYxHHA5iF7FBWx1SvpEyKVhhnIcuXGD7N5PbNZzEdmr9C6I7cPVkWO-sUV7zfFukexIcANmsd_oBBGKRoYzP5Tti4"
    // } 

    // Note: The JSON can contain other members, such as "use", "kid", or anything else.  These will be ignored.
    json.put_EmitCompact(false);

    // Show the JWK string to be loaded:
    String jwkStr = json.emit();

    CkPrivateKey privKey = new CkPrivateKey();
    success = privKey.LoadJwk(jwkStr);
    if (success != true) {
        Log.i(TAG, privKey.lastErrorText());
        return;
        }

    // OK.. the JWK is loaded.  It can be used in whatever way desired...

    // The key can be retrieved in any other format, such as XML or PEM..
    Log.i(TAG, privKey.getXml());

    // XML output:
    // <RSAKeyValue>
    // 	<Modulus>33TqqLR3eeUmDtHS89qF3p4MP7Wfqt2Zjj3lZjLjjCGDvwr9cJNlNDiuKboODgUiT4ZdPWbOiMAfDcDzlOxA04DDnEFGAf+kDQiNSe2ZtqC7bnIc8+KSG/qOGQIVaay4Ucr6ovDkykO5Hxn7OU7sJp9TP9H0JH8zMQA6YzijYH9LsupTerrY3U6zyihVEDXXOv08vBHk50BMFJbE9iwFwnxCsU5+UZUZYw87Uu0n4LPFS9BT8tUIvAfnRXIEWCha3KbFWmdZQZlyrFw0buUEf0YN3/Q0auBkdbDR/ES2PbgKTJdkjc/rEeM0TxvOUf7HuUNOhrtAVEN1D5uuxE1WSw==</Modulus>
    // 	<Exponent>AQAB</Exponent>
    // 	<D>DjU54mYvHpICXHjc5+JiFqiH8NkUgOG8LL4kwt3DeBp9bP0+5hSJH8vmzwJkeGG9L79EWG4b/bfxgYdeNX7cFFagmWPRFrlxbd64VRYFawZHRJt+2cbzMVI6DL8EK4bu5Ux5qTiV44Jw19hoD9nDzCTfPzSTSGrKD3iLPdnREYaIGDVxcjBv3Tx6rrv3Z2lhHHKhEHb0RRjATcjAVKV9NZhMajJ4l9pqJ3A4IQrCBl95ux6Xm1oXP0i6aR78cjchsCpcMXdP3WMsvHgTlsZT0RZLFHrvkiNHlPiil4G2/eHkwvT//CrcbO6SmI/zCtMmypuHJqcr+Xb7GPJoa64WoQ==</D>
    // 	<P>8K33pX90XX6PZGiv26wZm7tfvqlqWFT03nUMvOAytqdxhO2HysiPn4W58OaJd1tY4372Qpiv6enmUeI4MidCie+s+d0/B6A0xfhU5EeeaDN0xDOOl8yN+kaaVj9b4HDR3c91OAwKpDJQIeJVZtxoijxl+SRx3u7Vs/7meeSpOfE=</P>
    // 	<Q>7a5KnUs1pTo72A+JquJvIz4Eu794Yh3ftTk/Et+83aE/FVc6Nk+EhfnwYSNpVmM6UKdrAoy5gsCvZPxrq+eR9pEwU8M5UOlki03vWY/nqDBpJSIqwPvGHUB16zvggsPQUyQBfnN3N8XlDi12n88ltvWwEhn1LQOwMUALEfka9/s=</Q>
    // 	<DP>DB9nGuHplY/7Xv5a5UCs5YgxkWPtJFfbIZ1Zr+XHCCY09JIWReOGQG226OhjwixKtOK/OqmAKtMKM9OmKviJRHNbDhbTxumN3u7cL8dftjXpSryiEQlPmWyW94MneI2WNIrvh4wruQuDt8EztgOiDFxwcnUgey8iend7WmZnE7E=</DP>
    // 	<DQ>O+bSTUQ4N/UuQezgkF3TDrnBraO67leDGwRbfiE/U0ghQvqh5DA0QSPVzlWDZc9KUitvj8vxsR9o1PW9GS0an17GJEYuetLnkShKK3NWOhBBX6d1yP9rVdH6JhgIJEy/g0Suz7TAFiFc8i7JF8u4QJ05C8bZAMhOLotqftQeVOM=</DQ>
    // 	<InverseQ>InfGmkb2jNkPGuNiZ+mU0+ZrOgLza/fLL9ErZ35jUPhGFzdGxJNobklvsNoTd+E2GAU41YkJh24bncMLvJVYxHHA5iF7FBWx1SvpEyKVhhnIcuXGD7N5PbNZzEdmr9C6I7cPVkWO+sUV7zfFukexIcANmsd/oBBGKRoYzP5Tti4=</InverseQ>
    // </RSAKeyValue>

    Log.i(TAG, privKey.getPkcs8EncryptedPem("secret"));

    // PEM output

    // -----BEGIN ENCRYPTED PRIVATE KEY-----
    // MIIFDjBABgkqhkiG9w0BBQ0wMzAbBgkqhkiG9w0BBQwwDgQIRp9eD6gS5x4CAggA
    // MBQGCCqGSIb3DQMHBAgMYSDcTKD+UASCBMgAtoYFncjSiep51R2qhK0j5RLsPdCD
    // tb3GiwJJycYkMMpbOCVIBNtDMDRrAuTQmdDjFAgKkfktT0p1fLd0RHAv4JKWrDeE
    // OsV1BS1pJgI6ulEJVs7nwV9y6JkzuqIiguVM1ukYm8uwjVwKBQtOg9jZjE7uLqSs
    // X508rEI3BNxKeD5VMpIDzh+nil5pG3AC74/yAJFJop5J+dcoYgTIVwwcWsieKpCD
    // wgTmXQ53tYGtudC4HM3Wtp2PHdg6jDVZFeXkjbcJFKsmalw9wCDOUvE64onUqyhf
    // z/8Thu2g3Bs4rYXflEbIbsxqYit7wM5nLAvqByKdOUdmOLLsj0PlnN+ZA9+JRmnI
    // bOHUg+XxvreRdphXeNeUF16ro22c9TMyjSXiEP6RvrEcyoi0UnVeeCKjO90q10n3
    // TQdIFMkY1gwgUuBo+OUtZPTkbrFA33e9NiHc/OiHVETDHYO/WEceu2ef6mSjcw+C
    // Q6WMR6EH24eXUfoI4xaNexGaR7w2EkU1UfGqs6f+c4siZMPExm41H2Xc/MBOpmES
    // iQxoinajiiw4DOQ08Cs/hVAm4/dH9XhCnBIig+PZpmeOZGoeyK2D57czLaTPBHdH
    // Jr7sZ/pe9vk84DAeQw0nxRbatxBqw2Zq0r6kjmwljRKNlJXGuPlfw0ooOH8F4c+E
    // e8XwrPKsOe14u4plP5H0u5N+JVBJGJdGQOuFGKU7Flw0hgEdwdyxHv5dDmPyhtyR
    // Ty1YjYyGQZxWLxw4Q2qJwpikL6o8ylXegSr20aeHFDvtCY63UFLxvZ4pDnCxOIR8
    // xXJJy179t6BbCPQao4c5U/PRsahgUn/XjKL0lXFUyWoX6Rehr8Zmr+RZFaVhG4WO
    // ZodH2CzYNv6co7bfLKLa9u1NHPfTVTVxZTYKw/tuPGscVVhXptPDCjHqOvCtX+pS
    // +oshZ1SwM/0MgDmJfyJ0rDkkjBDsv5x5iJV9jmx/DAlGhOR7Is9xgjx5XEXD8oug
    // fVQI2ZpZqQ1EAPCGKfQl7XUMwN4S0cmYf/xS5afNMyABJGj0wUdF3YlHxkz+wkeE
    // poQ/1EVQLCTVcJBrbbpkJAgUFFwOm6o8behxgVr3yHuO6zuFi5rXVqnztm9JYMRj
    // H3ACb14wRR2ctyZovPvZpODywH1K7kfIdRn9UE/o21HfnhtdUJEFPTS16mjGsJpx
    // E5aSCXVrvrb/JqHpSvNRpKlHWV9nxuONzqBX3QKa5X/31opPI7qEBYND0oHuH/cB
    // BYlstKCUhb4hmg4M6qwA7qC5aLJVoz8toWA4cv0JhhVqnR1jcsyq+r4zusdiEJ2I
    // kW5F9u0zNLa8xHByz3Qr6wTMBu3NY3w9NFwIXXq2lkrxDlvHFjMImdXFzb/G1fbc
    // 7BDIOwPrEffb0yEsgHxJVHE3NPZJOrbLquS7M8IFjhoky6QxesaU/QLjyMMKphrQ
    // EdmBRwKsYHS9BdX4YawtCRjJd3n+z2guF+dIHDvIZVgL1Ednu7G654gVl+MJVIHo
    // Wc7pGOc3PRaAEPRF9O0Smwwr+x1qRedoCVhLc3idWPAW+dOTpZUbTSB21D/Q8vdr
    // QJ0fNbTa4AGLLoMOp0rZI1ji6ghcMqz5FqyhDqawSV7je6Z/EE0DRwzRZ1mRwykF
    // Qe0=
    // -----END ENCRYPTED PRIVATE KEY-----

  }

  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."
  }
}