phpcmstimestamper

This PHP project allows to append an RFC 3161 timestamp to an existing CMS signature.

See too https://blobfish.pe/blog/add-rfc-3161-timestamp-to-existing-pkcs-7cms-signature-in-php/.

Basic usage

Download this Git repository and execute the working sample demo.php:

<?php
$originalCmsAsPem = "-----BEGIN CMS-----
MIIFiAYJKoZIhvcNAQcCoIIFeTCCBXUCAQExDTALBglghkgBZQMEAgEwHQYJKoZI
...
1lUaWopfF7uZf5LXZt2Ru5UPr+51ULJRcEeUTA==
-----END CMS-----";
$updatedCms = CmsTimestamper::addTimestampToCms($originalCmsAsPem, "http://tsa.starfieldtech.com");

TODOS

• Check the ASN.1 library PHPASN1 (https://github.com/FGrosse/PHPASN1) and check if it would be a good idea to migrate to it instead of keep using phpseclib.