PGP encryption to multiple keys

  • Resolved parthsisay

    (@parthsisay)


    6 years, 3 months ago

    I’m trying to encrypt to multiple recipients, each with their own PGP public key.

    I can generate an array of OpenPGP_Message objects with
    $recip_keys = applyfilters(‘openpgp_key’, $public_keys)

    When I try to encrypt using the multiple keys
    ‘ apply_filters(‘openpgp_encrypt’, $recip_keys) ‘

    the message is not encrypted properly.

    It does encrypt if I specify the key– i.e. $recip_keys[0] , but doesn’t seem to accept multiple keys.

    Please tell me what I’m doing wrong. Thank you for your time.

Viewing 4 replies - 1 through 4 (of 4 total)
  • Thread Starter parthsisay

    (@parthsisay)

    6 years, 3 months ago

    I was unclear in my previous message.

    $keys= array();

    foreach ($users as $id){
    $wpuser = get_user_by( ‘ID’, $id );
    $key = $wp_user->pgp_public_key;
    array_push($keys, apply_filters(‘openpgp_key’, $wpuser->pgp_public_key));
    }

    so now I have an array $keys of a couple public pgp keys in binary.

    I want to make a post that each of those users can decrypt.

    The ‘encrypt’ method in class WP_OpenPGP says that it will accept an array of keys, but when I invoke it using applyfilters(‘openpgp_encrypt’,$message,$keys),
    it doesn’t work. It will work if instead of $keys, I specify one of the keys, $keys[0] for example. But it won’t encrypt over more than one key.

    Thank you 🙂

    Plugin Author Meitar

    (@meitar)

    6 years, 3 months ago

    It’s been long enough that I expected your code to work, but when I took a closer look at the plugin what I see is that your code is not expected to work because what you have is an array of OpenPGP_Message objects, each containing a single key, rather than an array of (presumably) OpenPGP_PublicKeyPacket objects (“simple key packets”). See this comment on the OpenPGP-PHP project’s issue number 41.

    However, I don’t think there are currently enough filters implemented in this plugin to do what you want. You can freely use the lower-level OpenPGP-PHP library that this plugin includes, but I’m afraid at the moment this should probably be considered a bug in the filter function’s documentation and/or submitted as a feature enhancement to the plugin’s issue tracker.

    If you have the time to patch the plugin, that would be welcome, too.

    Thread Starter parthsisay

    (@parthsisay)

    6 years, 3 months ago

    Thank you for your quick response.

    I also thought that it may be due to a problem with the objects in the array. I made arrays of OpenPGP_PublicKeyPackets, which didn’t work either. And then I tried just passing in arrays of binary-key strings, which also didn’t work.

    I’ve looked through the lower-level library, and finally posted here because I thought I must be overlooking something.

    Thank you for your time– if I figure out a good solution I’ll let you know.

    Plugin Author Meitar

    (@meitar)

    6 years, 3 months ago

    I made arrays of OpenPGP_PublicKeyPackets, which didn’t work either.

    If that fails, it may be a legitimate bug. Or maybe those are the incorrect objects to use for the lower-level library? I’m not sure.

    Thank you for your time– if I figure out a good solution I’ll let you know.

    Thanks, please do!

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘PGP encryption to multiple keys’ is closed to new replies.