I want to get sha1 of a string

[action]

do like this:

(ns clojurewerkz.support.hashing

  (:require [clojurewerkz.support.internal :as i])

  (:import [com.google.common.hash Hashing HashFunction HashCode]))

but:

FileNotFoundException Could not locate clojurewerkz/support__init.class or cloju

rewerkz/support.clj on classpath:   clojure.lang.RT.load (RT.java:443)

how to set the dependencies, or other solution？

Think you

[JPH]

I've had good experiences with https://github.com/xsc/pandect.

You can also use Java interop like this:
https://gist.github.com/prasincs/827272

JPH

[Zach Oakes]

You can use java.security.MessageDigest. For example:

(defn create-hash

  [data-barray]

  (.digest (java.security.MessageDigest/getInstance "SHA1") data-barray))

It takes and returns a byte array, but converting from/to a string is fairly straight-forward:

(->> "Hello, World!"

     .getBytes

     create-hash

     java.math.BigInteger.

     (format "%x")

     println)

[Ben Smith-Mannschott]

(-> "Hello, World!" .getBytes create-hash ...)

Will get you the hash of the string encoded to bytes using *some random encoding*. (Whatever the platform you're currently running on defaults to.)

You should explicitly choose an encoding and stick to it. I'd suggest UTF-8 since that can encode all the code points that might show up in a Java String.

(-> "Hello, World!" (.getBytes "UTF-8") create-hash java.math.BigInteger.)

// Ben

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[action]

ok，think you！

在 2014年3月2日星期日UTC+8上午12时28分25秒，JPH写道：

[xavi]

I found that the hexadecimal returned by Zach's solution sometimes has a "-" prefix (for example, for the "hello" string). I guess because BigInteger(byte[]) (http://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html#BigInteger-byte:A-) interprets the byte array as a two's-complement binary number, so it may be negative (http://en.wikipedia.org/wiki/Two's_complement).

To always get a SHA1 without the dash/minus prefix, BigInteger(int signum, byte[] magnitude) (http://docs.oracle.com/javase/8/docs/api/java/math/BigInteger.html#BigInteger-int-byte:A-) can be used, like this:

  (->> (.getBytes "hello" "UTF-8")

       (.digest (java.security.MessageDigest/getInstance "SHA1"))

       (java.math.BigInteger. 1)

       (format "%x"))

[Daniel]

+1 for Pandect. It's an excellent library which leverages bouncy castle and has had tons of top notch work put into it. Fast, well documented, and super easy to use.