--- crypt(salt)

    self  salt Ź沽줿ʸ֤ޤ
    salt ˤϱѿɥå(.)å(/)鹽롢
    2 ХȰʾʸꤷޤ

    salt ˤϡʲͤˤʤ٤ʸ֤٤Ǥ
      salt = [rand(64),rand(64)].pack("C*").tr("\x00-\x3f","A-Za-z0-9./")
      passwd.crypt(salt)

    Ź沽줿ʸ󤫤Ź沽ʸ (self) 뤳Ȥ
    ̤((*񤷤*))Ȥ졢self ΤäƤԤΤߤƱŹ沽
    줿ʸǤޤΤȤ self ΤäƤ뤫
    ɤǧڤ˻ȤȤޤ

    㤨 UNIX ѥɤǧڤϰʲΤ褦ˤƹԤޤ
    ( Etc.getpwnam ǰŹ沽ʸ뤳ȤꤷƤޤ)

       require 'etc'

       user = "foo"
       passwd = "bar"

       ent = Etc.getpwnam(user)
       p passwd.crypt(ent.passwd) == ent.passwd

    ((**)):

    * crypt ν crypt(3) [manual page] μ˰¸Ƥޤ
      äơcrypt ǽƤξܺ٤ salt ͿˤĤƤϡ
      ѴĶ crypt(3) [manual page] 򸫤ƳǧƤ

    * crypt η̤ѴĶۤʤѤ礬ޤ
      crypt η̤򡢰ۤʤѴĶ̤ƻѤˤ
      Ʋ

    * ŵŪ DES Ѥ crypt(3) [manual page] ξ硢
      self κǽ 8 Хȡsalt κǽ 2 ХȤѤޤ

