Swift

Create JWT using a Brainpool EC Key

See more JSON Web Token (JWT) Examples

Demonstrates how to create a JWT using an EC private key. This is for JOSE headers having an "alg" member with any of the following values:

• 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

Swift

func chilkatTest() {
    var success: Bool = false

    // 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.

    let privKey = CkoPrivateKey()!

    // Load a brainpool EC key.
    success = privKey.loadPemFile(path: "c:/qa_data/pem/ec_brainpool_privKey.pem")
    if success != true {
        print("\(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>
    print("\(privKey.getXml()!)")

    let jwt = CkoJwt()!

    // Build the JOSE header
    let jose = CkoJsonObject()!
    // Use the brainpool curve name matching the private key you just loaded.
    // Use "BP256R1", or "BP384R1", etc.   
    success = jose.appendString(name: "alg", value: "BP256R1")
    success = jose.appendString(name: "typ", value: "JWT")

    // Now build the JWT claims (also known as the payload)
    let claims = CkoJsonObject()!
    success = claims.appendString(name: "iss", value: "http://example.org")
    success = claims.appendString(name: "sub", value: "John")
    success = claims.appendString(name: "aud", value: "http://example.com")

    // Set the timestamp of when the JWT was created to now.
    var curDateTime: Int = jwt.genNumericDate(numSecOffset: 0).intValue
    success = claims.addInt(at: -1, name: "iat", value: curDateTime)

    // Set the "not process before" timestamp to now.
    success = claims.addInt(at: -1, name: "nbf", value: curDateTime)

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

    // Produce the smallest possible JWT:
    jwt.autoCompact = true

    // Create the JWT token.  This is where the ECC signature is created.
    var token: String? = jwt.createPk(header: jose.emit(), payload: claims.emit(), key: privKey)

    print("\(token!)")

}