Fatal error when Email Subscribers plugin attempts to send email to a user with their S/MIME certificate

[fabacab]

Via https://wordpress.org/support/topic/accept-also-smime-keys/page/2/#post-9174319:

I have tested the “Email Subscribers & Newsletters” and is giving me a error when sending “Newsletters”.

Fatal error: Uncaught exception ‘Error’ with message ‘Length must be greater than 0’ in /www/blog/wp-includes/random_compat/random_bytes_dev_urandom.php:93 Stack trace: #0 /www/blog/wp-content/plugins/wp-pgp-encrypted-emails/includes/class-wp-smime.php(139): random_bytes(0) #1 [internal function]: WP_SMIME::encrypt(‘<strong style=”…’, ‘From: “Admin” <…’, Resource id #297) #2 /www/blog/wp-includes/class-wp-hook.php(298): call_user_func_array(Array, Array) #3 /www/blog/wp-includes/plugin.php(203): WP_Hook->apply_filters(‘<strong style=”…’, Array) #4 /www/blog/wp-content/plugins/wp-pgp-encrypted-emails/wp-pgp-encrypted-emails.php(1340): apply_filters(‘smime_encrypt’, ‘<strong style=”…’, ‘From: “Admin” <…’, Resource id #297) #5 /www/blog/wp-content/plugins/ in /www/blog/wp-includes/random_compat/random_bytes_dev_urandom.php on line 93

The e-mail to the webmaster e-mail is send encrypted, the e-mail to the user without S/MIME key is send properly, the e-mail send to the user with S/MIME key set up is not sent.

The same happens when publishing a normal article of the wordpress… and I really mean, I do a normal article on wordpress, but when I publish it to the web site I received the error bellow:

Fatal error: Uncaught exception ‘Error’ with message ‘Length must be greater than 0’ in /www/blog/wp-includes/random_compat/random_bytes_dev_urandom.php:93 Stack trace: #0 /www/blog/wp-content/plugins/wp-pgp-encrypted-emails/includes/class-wp-smime.php(139): random_bytes(0) #1 [internal function]: WP_SMIME::encrypt(‘Hello Carina,<b…’, ‘From: “Admin” <…’, Resource id #295) #2 /www/blog/wp-includes/class-wp-hook.php(298): call_user_func_array(Array, Array) #3 /www/blog/wp-includes/plugin.php(203): WP_Hook->apply_filters(‘Hello Carina,<b…’, Array) #4 /www/blog/wp-content/plugins/wp-pgp-encrypted-emails/wp-pgp-encrypted-emails.php(1340): apply_filters(‘smime_encrypt’, ‘Hello Carina,<b…’, ‘From: “Admin” <…’, Resource id #295) #5 /www/blog/wp-content/plugins/ in /www/blog/wp-includes/random_compat/random_bytes_dev_urandom.php on line 93

“Hello Carina” is probably referring in this case of the user with S/MIME set up on its account.
The other e-mails are sent correctly (encrypted to the admin e-mail, and to the none set up S/MIME user).

And yes the article is published correctly on the web site.

This happens if “Email Subscribers & Newsletters” is active… without it the e-mail notifications can’t be send of course. Disabling the “WP PGP Encrypted Emails” makes it work properly without errors.

[fabacab]

I cannot confirm this behavior. Awaiting feedback from the reporter.

[fabacab]

No feedback from the reporter, so this issue is considered resolved.