(JavaScript) Create JWS using the Flattened JSON Serialization Format

Creates a JSON Web Signature (JWS) containing 1 signature and output using the flattened JSON serialization format.

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

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

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

// The JWS to be created will contain one signature using an ECDSA key.

var sbEccJwk = new CkStringBuilder();
sbEccJwk.Append("{\"kty\":\"EC\",");
sbEccJwk.Append("\"crv\":\"P-256\",");
sbEccJwk.Append("\"x\":\"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU\",");
sbEccJwk.Append("\"y\":\"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0\",");
sbEccJwk.Append("\"d\":\"jpsQnnGQmL-YBIffH1136cspYG6-0iY7X1fCE9-E9LI\"");
sbEccJwk.Append("}");

var eccKey = new CkPrivateKey();
// Note: This example loads the ECDSA key from JWK format.  Any format can be loaded
// into the private key object. (See the online reference documentation..)
success = eccKey.LoadJwk(sbEccJwk.GetAsString());
if (success !== true) {
    console.log(eccKey.LastErrorText);
    return;
}

// ---------------------------------------------------
// Prepare both a protected and unprotected header.

var jwsProtHdr = new CkJsonObject();
jwsProtHdr.AppendString("alg","ES256");

var jwsUnprotHdr = new CkJsonObject();
jwsUnprotHdr.AppendString("kid","myEcKey");

// ---------------------------------------------------
var jws = new CkJws();

jws.SetProtectedHeader(0,jwsProtHdr);
jws.SetUnprotectedHeader(0,jwsUnprotHdr);

jws.SetPrivateKey(0,eccKey);

var bIncludeBom = false;
var payloadStr = "In our village, folks say God crumbles up the old moon into stars.";
jws.SetPayload(payloadStr,"utf-8",bIncludeBom);

// ---------------------------------------------------
// Create the JWS.
// Indicate we prefer the non-compact, flattened serialization.
jws.PreferCompact = false;
jws.PreferFlattened = true;

var jwsStr = jws.CreateJws();
if (jws.LastMethodSuccess !== true) {
    console.log(jws.LastErrorText);
    return;
}

// The jwsStr is contains the flattened JSON in the smallest possible size, which is a single line.
// To get in human-readable format, load into a Chilkat JSON object and emit..
var json = new CkJsonObject();
json.Load(jwsStr);
json.EmitCompact = false;
console.log(json.Emit());

// Sample output:

// { 
//   "payload": "SW4gb3VyIHZpbGxhZ2UsIGZvbGtzIHNheSBHb2QgY3J1bWJsZXMgdXAgdGhlIG9sZCBtb29uIGludG8gc3RhcnMu",
//   "protected": "eyJhbGciOiJFUzI1NiJ9",
//   "header": { 
//     "kid": "myEcKey"
//   },
//   "signature": "b7V2UpDPytr-kMnM_YjiQ3E0J2ucOI9LYA7mt57vccrK1rb84j9areqgQcJwOA00aWGoz4hf6sMTBfobdcJEGg"
// }