(Java) Load JWK into PublicKey Object

Demonstrates how to load a Java Web Key (JWK) into a Chilkat public key object.

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

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    //  Imagine we have this JWK:

    //  {
    //  "kty":"RSA",
    //  "kid":"bilbo.baggins@hobbiton.example",
    //  "use":"sig",
    //  "n":"26381066103266289976070039679240841999340706859156341823971393693544846472963839705790075117105560154606562987481050889935247188300178764426769543782451174831475924241862817098997865881169498995546309260357488285676768114714548754913374731868063116787903918383610614912211576698081222844057810710088656983077876282582286966085572172471849443305250452393766960762340311496052418952315081937000716222751229644449475751932222180738210988190709824209639002026650048655399108647971010890335494074025258268035713167380057822555485524738518699437692145859633592396626258745090144803752145540471688039673495588314804430463791",
    //  "e":"65537"
    //  }
    // 

    CkStringBuilder sbJwk = new CkStringBuilder();
    boolean success = sbJwk.LoadFile("qa_data/jwk/simple_jwk_rsa.json","utf-8");
    if (success != true) {
        System.out.println("Failed to load simple JWK file.");
        return;
        }

    //  Loading it into a Chilkat public key object is easy:
    CkPublicKey pubkey = new CkPublicKey();
    success = pubkey.LoadFromString(sbJwk.getAsString());
    if (success != true) {
        System.out.println(pubkey.lastErrorText());
        return;
        }

    System.out.println("Simple JWK loaded into public key object.");

    //  ----------------------------------------------------------------------------------------------------------
    //  Demonstrate how to load a JWK that is contained within JSON into a public key object.

    //  {
    //    "alg":"RS256",
    //    "jwk":  {
    //            "kty":"RSA",
    //            "kid":"bilbo.baggins@hobbiton.example",
    //            "use":"sig",
    //            "n":"26381066103266289976070039679240841999340706859156341823971393693544846472963839705790075117105560154606562987481050889935247188300178764426769543782451174831475924241862817098997865881169498995546309260357488285676768114714548754913374731868063116787903918383610614912211576698081222844057810710088656983077876282582286966085572172471849443305250452393766960762340311496052418952315081937000716222751229644449475751932222180738210988190709824209639002026650048655399108647971010890335494074025258268035713167380057822555485524738518699437692145859633592396626258745090144803752145540471688039673495588314804430463791",
    //            "e":"65537"
    //            }
    //  }

    CkStringBuilder sbJwk2 = new CkStringBuilder();
    success = sbJwk2.LoadFile("qa_data/jwk/contained_jwk_rsa.json","utf-8");
    if (success != true) {
        System.out.println("Failed to load JWK file.");
        return;
        }

    //  Get the "jwk" part of the JSON..
    CkJsonObject json = new CkJsonObject();
    json.Load(sbJwk2.getAsString());

    CkJsonObject jsonJwk = json.ObjectOf("jwk");
    if (json.get_LastMethodSuccess() != true) {
        System.out.println("No jwk member exists.");
        return;
        }

    CkPublicKey pubkey2 = new CkPublicKey();
    success = pubkey2.LoadFromString(jsonJwk.emit());
    if (success != true) {
        System.out.println(pubkey2.lastErrorText());
        return;
        }

    System.out.println("Contained JWK loaded into public key object.");
  }
}