Manipulate the Linux kernel keyring. More information: https://manned.org/keyctl.
keyctl list target_keyring
keyctl list @us
keyctl add type_keyring key_name key_value target_keyring
stdin
:echo -n key_value | keyctl padd type_keyring key_name target_keyring
keyctl timeout key_name timeout_in_seconds
keyctl read key_name
keyctl pipe key_name
keyctl revoke key_name