[PATCH 04/12] lib: Key str_hash/strcase_hash with a random seed to prevent HashDoS

[PATCH 04/12] lib: Key str_hash/strcase_hash with a random seed to prevent HashDoS

hash_init() fills a process-wide uint64_t hash_iv via random_fill()
at lib_init() time (after random_init()). str_hash() and strcase_hash()
pass hash_iv as the xxh64 seed so an attacker cannot predict bucket
placement and manufacture collision chains.

Gbp-Pq: Name 0004-lib-Key-str_hash-strcase_hash-with-a-random-seed-to-.patch