Computing the MD5 hash of a string in scala [duplicate]

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Generate MD5 hash in Java

Hi,

I want to compute the MD5 hash of a string in my scala code. Is there any scala or java library i can use to do this quickly, apart from the regular java.security.MessageDigest way ?

Please Help Thanks

Why cant you use java.security.MessageDigest? Just wrap it in a public static function to make less clutter in Scala? — Karl-Bjørnar Øie
– Karl-Bjørnar Øie, Commented May 13, 2011 at 13:43
net.liftweb.util.Helpers.md5(str) – of course it only makes sense when you’re already using liftweb somewhere… — Debilski
– Debilski, Commented May 13, 2011 at 14:03
@Goran Jovic Of course it does. Why should it implement that function again? — Debilski
– Debilski, Commented May 13, 2011 at 14:16

Debilski · Accepted Answer · 2011-05-13 14:21:29Z

80

You may be reinventing a very tiny wheel here, but just write a function to do what you want: take a string, use MessageDigest, and return whatever (hex string, byte array) you need.

import java.security.MessageDigest def md5(s: String) = { MessageDigest.getInstance("MD5").digest(s.getBytes) } md5("Hello")

P.S. I don't write Scala, but this works and it's left as an exercise to the reader to turn it into anything other than an Array[Byte]

edited May 13, 2011 at 14:21

Debilski

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answered May 13, 2011 at 13:47

John Cromartie

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12 Comments

John Cromartie Over a year ago

@Debilski the bytes in the digest are nonsense as characters themselves when used to create a string. Someone usually wants to format them as hex digits... I know in Clojure this would be like (apply str (map #(format "%02x" %) bytes))

Alois Cochard Over a year ago

@Debilksi I don't think the first map(0xFF & _) is necessary, simply .map("%02X".format(_)).mkString

Guy Sopher Over a year ago

Here's some gists to create md5 strings in all languages: gist.github.com/amscotti/2467512

Priyank Desai Over a year ago

I came here looking for this:

def md5Hash(text: String) : String = java.security.MessageDigest.getInstance("MD5").digest(text.getBytes()).map(0xFF & _).map { "%02x".format(_) }.foldLeft(""){_ + _}

AjitChahal Over a year ago

Here is complete extension method, can be used as "testString".hash

import java.security.MessageDigest object StringExtensions { implicit class RichString(val str: String) extends AnyVal { def hash: String = MessageDigest.getInstance("MD5").digest(str.getBytes).map("%02X".format(_)).mkString + "-" + str } }

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