DES_set_key (= set_key = DES_key_sched = key_sched) calls DES_set_key_checked if global variable DES_check_key is set, DES_set_key_unchecked otherwise.
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DES_set_key (= set_key = DES_key_sched = key_sched) calls DES_set_key_checked if global variable DES_check_key is set, DES_set_key_unchecked otherwise.