psa_get_and_lock_key_slot_in_memory() function

Get the description in memory of a key given its identifier and lock it. The descriptions of volatile keys and loaded persistent keys are stored in key slots. This function returns a pointer to the key slot containing the description of a key given its identifier. The function searches the key slots containing the description of the key with \p key identifier. The function does only read accesses to the key slots. The function does not load any persistent key thus does not access any storage. For volatile key identifiers, only one key slot is queried as a volatile key with identifier key_id can only be stored in slot of index ( key_id - #PSA_KEY_ID_VOLATILE_MIN ). On success, the function locks the key slot. It is the responsibility of the caller to unlock the key slot when it does not access it anymore. If multi-threading is enabled, the caller must hold the global key slot mutex.