root/security/keys/

[..]
  1. compat.c
  2. internal.h
  3. key.c
  4. keyctl.c
  5. keyring.c
  6. permission.c
  7. proc.c
  8. process_keys.c
  9. request_key.c
  10. request_key_auth.c
  11. sysctl.c
  12. user_defined.c
[..]