How to add multiple signers?

[wellbranding]

Hello, how can I solve the following issue: I need multiple signers to sign a document. Each signer has a different certificate. I use that certificate to pass it to the instance of the class DataToSign with method withSigningCertificate(). However, how can I add multiple signing certificates?

Or should I use a new container for the same document and sign the same document with only a single certificate?

I am thinking about the following flow:

Get a signature from every signer, like this:

1. Serialize the container

2. //Finalize the signature Signature signature = dataToSign.finalize(signatureValue);

3.Then deserialize container and attach that signature.

4. After that serialize the container again, until all recipients have signed the document, yes?

The only question remains: is it alright to serialize a container, with attached signature? I did not see it in the sample, perhaps it is not possible?

[naare]

Take a look at the description here: https://github.com/open-eid/digidoc4j/wiki/Examples-of-using-it#saving-container-and-datatosign-objects-during-signature-creation

This explains how to do signing in multiple steps.

You need new DataToSign object for each signer and it must be stored for finalization as described in above example.