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joelittlejohn/base62-id.clj

Last active December 26, 2015 21:39
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Create base62 ids with 64-bit entropy in Clojure
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base62-id.clj
(let [digits (into [] (map char (concat (range 48 58) (range 65 91) (range 97 123)))) ;; 0-9,A-Z,a-z
base (biginteger (count digits))
entropy 64]
(defn id []
(loop [id10 (BigInteger. entropy (java.security.SecureRandom.))
id62 ""]
(if (and (<= id10 (BigInteger/ZERO)) (seq id62))
id62
(let [[d r] (.divideAndRemainder id10 base)]
(recur d (str id62 (digits (.intValue r)))))))))
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