(.NET Core C#) 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.

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// 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.

Chilkat.StringBuilder sbEccJwk = new Chilkat.StringBuilder();
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("}");

Chilkat.PrivateKey eccKey = new Chilkat.PrivateKey();
// 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..)
bool success = eccKey.LoadJwk(sbEccJwk.GetAsString());
if (success != true) {
    Debug.WriteLine(eccKey.LastErrorText);
    return;
}

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

Chilkat.JsonObject jwsProtHdr = new Chilkat.JsonObject();
jwsProtHdr.AppendString("alg","ES256");

Chilkat.JsonObject jwsUnprotHdr = new Chilkat.JsonObject();
jwsUnprotHdr.AppendString("kid","myEcKey");

// ---------------------------------------------------
Chilkat.Jws jws = new Chilkat.Jws();

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

jws.SetPrivateKey(0,eccKey);

bool bIncludeBom = false;
string 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;

string jwsStr = jws.CreateJws();
if (jws.LastMethodSuccess != true) {
    Debug.WriteLine(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..
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.Load(jwsStr);
json.EmitCompact = false;
Debug.WriteLine(json.Emit());

// Sample output:

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