Sign a JWS with a Private Key

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetPrivateKey, which sets the private key used to create a signature. The example uses RS256 (RSASSA-PKCS1-v1_5 with SHA-256).

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

func chilkatTest() {
    var success: Bool = false

    let jws = CkoJws()!

    //  Protected header specifying RSASSA-PKCS1-v1_5 with SHA-256 (RS256).
    let header = CkoJsonObject()!
    header.updateString(jsonPath: "alg", value: "RS256")
    success = jws.setProtectedHeader(index: 0, json: header)
    if success == false {
        print("\(jws.lastErrorText!)")
        return
    }

    var bIncludeBom: Bool = false
    success = jws.setPayload(payload: "This is the content to sign.", charset: "utf-8", includeBom: bIncludeBom)
    if success == false {
        print("\(jws.lastErrorText!)")
        return
    }

    //  The file path is relative to the application's current working directory.  An absolute path
    //  may also be used.  Supply the path appropriate to your own environment.
    //  Load the signer's private key and set it for signature 0.
    let privKey = CkoPrivateKey()!
    success = privKey.loadPemFile(path: "qa_data/signer_privkey.pem")
    if success == false {
        print("\(privKey.lastErrorText!)")
        return
    }

    success = jws.setPrivateKey(index: 0, privKey: privKey)
    if success == false {
        print("\(jws.lastErrorText!)")
        return
    }

    var jwsCompact: String? = jws.create()
    if jws.lastMethodSuccess == false {
        print("\(jws.lastErrorText!)")
        return
    }

    print("\(jwsCompact!)")

}