(Swift 2) Create JWT Using Ed25519 Private Key (EdDSA)

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Demonstrates how to create a JWT using an Ed25519 private key. If the private key is Ed25519, which is an EdDSA algorithm, the JOSE header's "alg" member should be set to "EdDSA".

Note: This example requires Chilkat v9.5.0.95 or greater.

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

    // Demonstrates how to create a JWT using an Ed25519 private key.

    let privKey = CkoPrivateKey()

    // Load an Ed25519 (EdDSA) private key from a PEM file.
    var success: Bool = privKey.LoadPemFile("qa_data/eddsa/ed25519.pem")
    if success != true {
        print("\(privKey.LastErrorText)")
        return
    }

    let jwt = CkoJwt()

    // Build the JOSE header
    let jose = CkoJsonObject()

    // -----------------------------------------------------------------
    // Note: This example requires Chilkat v9.5.0.95 or greater.
    // -----------------------------------------------------------------
    success = jose.AppendString("alg", value: "EdDSA")
    success = jose.AppendString("typ", value: "JWT")

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

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

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

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

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

    // Create the JWT token.
    var token: String? = jwt.CreateJwtPk(jose.Emit(), payload: claims.Emit(), key: privKey)

    print("\(token!)")

    // Example output:
    // eyJhbGciOiJFZERTQSIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNjg3OTcwNjgyLCJuYmYiOjE2ODc5NzA2ODIsImV4cCI6MTY4Nzk3NDI4Mn0.eyfrDJfuWJSJVJPfAUYb_p_c-LF_YULHGRaZx82MLLjMLCCFEEGckp8icuayf5bLW9ah20LzYYt0JgOBIB0RDg

}