agent: Ignore passphrase constraints for a generated passphrase.
* agent/agent.h (PINENTRY_STATUS_PASSWORD_GENERATED): New. (MAX_GENPIN_TRIES): Remove. * agent/call-pinentry.c (struct entry_parm_s): (struct inq_cb_parm_s): Add genpinhash and genpinhas_valid. (is_generated_pin): New. (inq_cb): Suppress constraints checking for a generated passphrase. No more need for several tries to generate the passphrase. (do_getpin): Store a generated passphrase/pin in the status field. (agent_askpin): Suppress constraints checking for a generated passphrase. (agent_get_passphrase): Ditto. * agent/command.c (cmd_get_passphrase): Ditto.
A generated passphrase has enough entropy so that all kind of extra
checks would only reduce the actual available entropy. We thus detect
if a passphrase has been generated (and not changed) and skip all
passphrase constraints checking.