(C#) Create JWT using a Brainpool EC Key

See more JSON Web Token (JWT) Examples

• BP160R1
• BP192R1
• BP224R1
• BP256R1
• BP320R1
• BP384R1
• BP512R1

This example also demonstrates how to include time constraints:

• nbf: Not Before Time
• exp: Expiration Time
• iat: Issue At Time

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

// Demonstrates how to create a JWT using a brainpool EC private key.

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

Chilkat.PrivateKey privKey = new Chilkat.PrivateKey();

// Load a brainpool EC key.
bool success = privKey.LoadPemFile("c:/qa_data/pem/ec_brainpool_privKey.pem");
if (success != true) {
    Debug.WriteLine(privKey.LastErrorText);
    return;
}

// You can examine the curve name of the key you just loaded by getting the private in XML format:
// <ECCKeyValue curve="CURVE_NAME">...</ECCKeyValue>
Debug.WriteLine(privKey.GetXml());

Chilkat.Jwt jwt = new Chilkat.Jwt();

// Build the JOSE header
Chilkat.JsonObject jose = new Chilkat.JsonObject();
// Use the brainpool curve name matching the private key you just loaded.
// Use "BP256R1", or "BP384R1", etc.   
success = jose.AppendString("alg","BP256R1");
success = jose.AppendString("typ","JWT");

// Now build the JWT claims (also known as the payload)
Chilkat.JsonObject claims = new Chilkat.JsonObject();
success = claims.AppendString("iss","http://example.org");
success = claims.AppendString("sub","John");
success = claims.AppendString("aud","http://example.com");

// Set the timestamp of when the JWT was created to now.
int curDateTime = jwt.GenNumericDate(0);
success = claims.AddIntAt(-1,"iat",curDateTime);

// Set the "not process before" timestamp to now.
success = claims.AddIntAt(-1,"nbf",curDateTime);

// Set the timestamp defining an expiration time (end time) for the token
// to be now + 1 hour (3600 seconds)
success = claims.AddIntAt(-1,"exp",curDateTime + 3600);

// Produce the smallest possible JWT:
jwt.AutoCompact = true;

// Create the JWT token.  This is where the ECC signature is created.
string token = jwt.CreateJwtPk(jose.Emit(),claims.Emit(),privKey);

Debug.WriteLine(token);