Load and Validate a JWS from a String

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.LoadJws, which loads a JWS from its compact serialization string. The example then supplies the MAC key and validates the signature.

func chilkatTest() {
    var success: Bool = false

    let jws = CkoJws()!

    //  Load the JWS compact serialization.
    var jwsCompact: String? = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>"
    success = jws.load(jwsStr: jwsCompact)
    if success == false {
        print("\(jws.lastErrorText!)")
        return
    }

    //  Provide the HMAC key for signer 0, then validate the signature.  Validate returns 1 when the
    //  signature is cryptographically valid, 0 when it is not, or a negative value on error.
    var base64Key: String? = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
    success = jws.setMacKey(index: 0, key: base64Key, encoding: "base64")
    if success == false {
        print("\(jws.lastErrorText!)")
        return
    }

    var v: Int = jws.validate(index: 0).intValue
    if v < 0 {
        print("\(jws.lastErrorText!)")
        return
    }

    if v != 1 {
        print("The signature is not valid.")
        return
    }

    print("The signature is valid.")

}