pickRandomItems(N, @list)

Returns a list of N unique items picked at random from the input list.

gpg_is_v21()

Detects the version of the gpg binary in the $PATH. Returns true iff. it is 2.1 or newer.

gpgPublicKeys()

Returns the list of key fingerprints found in the public keyring.

Args:
- $gnupg_options: reference to a hash passed to ->hash_init

gpgRecvKeys( $keyids, $gnupg_options )

Imports the keys with the given key IDs from a keyserver.

Args:
- $keyids: reference to an array of key IDs
- $gnupg_options: reference to a hash passed to ->hash_init

checkGpgHasDefinedKeyserver

Throws an exception if no keyserver is defined in GnuPG configuration.

When using GnuPG 2.x, a keyserver can be defined either in dirmngr's configuration or in good old gpg.conf, so we check both.

averageLapseTime

Argument: number of public keys in the keyring. Returns the desirable average lapse time (in seconds) between two key fetches.