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「数字6桁パスワードのハッシュ値の総当たり、PHPなら約0.25秒で終わるよ(http://z.tokumaru.org/2014/02/6php025.html )」で、PHPに比べてClojureがやたら遅いという話だったので、Clojureのコードをいろいろいじってみた。
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(ns six-length.core | |
(:require [clojure.core.reducers :as r] | |
[clojure.string :as s]) | |
(:import [java.security MessageDigest] | |
[javax.xml.bind DatatypeConverter])) | |
(set! *warn-on-reflection* true) | |
(def hexdigest | |
(let [digester (MessageDigest/getInstance "MD5")] | |
(fn [^String s] | |
(doto digester | |
(.reset) | |
(.update (.getBytes s))) | |
(DatatypeConverter/printHexBinary (.digest digester))))) | |
(defn find-password [salt pw] | |
(let [pw (s/upper-case pw)] | |
(->> (range 0 1000000) | |
(map #(let [s (str "000000" %), len (count s)] | |
(subs s (- len 6) len))) | |
(map (fn [_] [_ (hexdigest (str salt "$" _))])) | |
(filter #(= pw (second %)))))) |
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