Sign Message Example

This example shows how to create a signed message, attach a signer and then serialize the message to a buffer.

public static void SignAMessage(string ContentToSign) throws CoseException {
    //  Create the signed message
    SignMessage msg = new SignMessage();
    //  Add the content to the message
    msg.SetContent(ContentToSign);
    //  Create the signer for the message
    Signer signer = new Signer();
    signer.setKey(signingKey);
    signer.addAttribute(HeaderKeys.Algorithm, AlgorithmID.AsCBOR(), Attribute.ProtectedAttributes);

    msg.addSigner(signer);

    //  Force the message to be signed
    msg.sign();

    //  Now serialize out the message
    return msg.EncodeToBytes();
}

See Also: Validate Signed Message Example