(MFC) 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.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkStringBuilder.h>
#include <CkPublicKey.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    CkString strOut;

    //  Imagine we have this JWK:

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

    CkStringBuilder sbJwk;
    bool success = sbJwk.LoadFile("qa_data/jwk/simple_jwk_rsa.json","utf-8");
    if (success != true) {
        strOut.append("Failed to load simple JWK file.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    //  Loading it into a Chilkat public key object is easy:
    CkPublicKey pubkey;
    success = pubkey.LoadFromString(sbJwk.getAsString());
    if (success != true) {
        strOut.append(pubkey.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("Simple JWK loaded into public key object.");
    strOut.append("\r\n");

    //  ----------------------------------------------------------------------------------------------------------
    //  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;
    success = sbJwk2.LoadFile("qa_data/jwk/contained_jwk_rsa.json","utf-8");
    if (success != true) {
        strOut.append("Failed to load JWK file.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

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

    CkJsonObject *jsonJwk = json.ObjectOf("jwk");
    if (json.get_LastMethodSuccess() != true) {
        strOut.append("No jwk member exists.");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkPublicKey pubkey2;
    success = pubkey2.LoadFromString(jsonJwk->emit());
    if (success != true) {
        strOut.append(pubkey2.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("Contained JWK loaded into public key object.");
    strOut.append("\r\n");

    delete jsonJwk;


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }