(Swift 3,4,5...) 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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func chilkatTest() {
    // Imagine we have this JWK:

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

    let sbJwk = CkoStringBuilder()!
    var success: Bool = sbJwk.loadFile("qa_data/jwk/simple_jwk_rsa.json", charset: "utf-8")
    if success != true {
        print("Failed to load simple JWK file.")
        return
    }

    // Loading it into a Chilkat public key object is easy:
    let pubkey = CkoPublicKey()!
    success = pubkey.load(from: sbJwk.getAsString())
    if success != true {
        print("\(pubkey.lastErrorText!)")
        return
    }

    print("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"
    //           }
    // }

    let sbJwk2 = CkoStringBuilder()!
    success = sbJwk2.loadFile("qa_data/jwk/contained_jwk_rsa.json", charset: "utf-8")
    if success != true {
        print("Failed to load JWK file.")
        return
    }

    // Get the "jwk" part of the JSON..
    let json = CkoJsonObject()!
    json.load(sbJwk2.getAsString())

    var jsonJwk: CkoJsonObject? = json.object(of: "jwk")
    if json.lastMethodSuccess != true {
        print("No jwk member exists.")
        return
    }

    let pubkey2 = CkoPublicKey()!
    success = pubkey2.load(from: jsonJwk!.emit())
    if success != true {
        print("\(pubkey2.lastErrorText!)")
        return
    }

    print("Contained JWK loaded into public key object.")

    jsonJwk = nil

}