(Swift 3,4,5...) Create JWT Using HS256, HS384, or HS512

Demonstrates how to create a JWT using HS256, HS384, or HS512. (HS256 is JWT's acronym for HMAC-SHA256.) When HMAC is used, the secret is a shared secret (i.e. password) that both client and server know beforehand.

This example also demonstrates how to include time constraints:

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

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // Demonstrates how to create an HMAC JWT using a shared secret (password).

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

    let jwt = CkoJwt()!

    // Build the JOSE header
    let jose = CkoJsonObject()!
    // Use HS256.  Pass the string "HS384" or "HS512" to use a different algorithm.
    var success: Bool = jose.append("alg", value: "HS256")
    success = jose.append("typ", value: "JWT")

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

    // Set the timestamp of when the JWT was created to now.
    var curDateTime: Int = jwt.genNumericDate(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

    var strJwt: String? = jwt.createJwt(jose.emit(), payload: claims.emit(), password: "secret")

    print("\(strJwt!)")

}