This extension should be placed in a directory called "SecureMail" in the
Bugzilla extensions/ directory. After installing it, remove the file
"disabled" (if present) and then run checksetup.pl.

Instructions for user key formats:

S/MIME Keys must be in PEM format - i.e. Base64-encoded text, with BEGIN CERTIFICATE
PGP keys must be ASCII-armoured - i.e. text, with BEGIN PGP PUBLIC KEY.