(Objective-C) 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 <CkoStringBuilder.h>
#import <CkoPublicKey.h>
#import <CkoJsonObject.h>

// Imagine we have this JWK:

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

CkoStringBuilder *sbJwk = [[CkoStringBuilder alloc] init];
BOOL success = [sbJwk LoadFile: @"qa_data/jwk/simple_jwk_rsa.json" charset: @"utf-8"];
if (success != YES) {
    NSLog(@"%@",@"Failed to load simple JWK file.");
    return;
}

// Loading it into a Chilkat public key object is easy:
CkoPublicKey *pubkey = [[CkoPublicKey alloc] init];
success = [pubkey LoadFromString: [sbJwk GetAsString]];
if (success != YES) {
    NSLog(@"%@",pubkey.LastErrorText);
    return;
}

NSLog(@"%@",@"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"
//           }
// }

CkoStringBuilder *sbJwk2 = [[CkoStringBuilder alloc] init];
success = [sbJwk2 LoadFile: @"qa_data/jwk/contained_jwk_rsa.json" charset: @"utf-8"];
if (success != YES) {
    NSLog(@"%@",@"Failed to load JWK file.");
    return;
}

// Get the "jwk" part of the JSON..
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json Load: [sbJwk2 GetAsString]];

CkoJsonObject *jsonJwk = [json ObjectOf: @"jwk"];
if (json.LastMethodSuccess != YES) {
    NSLog(@"%@",@"No jwk member exists.");
    return;
}

CkoPublicKey *pubkey2 = [[CkoPublicKey alloc] init];
success = [pubkey2 LoadFromString: [jsonJwk Emit]];
if (success != YES) {
    NSLog(@"%@",pubkey2.LastErrorText);
    return;
}

NSLog(@"%@",@"Contained JWK loaded into public key object.");