Base 64 encoding with Scala or Java

Question

I have tried :

val md = java.security.MessageDigest.getInstance("SHA-1")
val result = new sun.misc.BASE64Encoder().encode(md.digest("user:pass".getBytes))

RESULT:

md: java.security.MessageDigest = SHA-1 Message Digest from SUN, <initialized>
result: String = smGaoVKd/cQkjm7b88GyorAUz20=

I also tried :

import java.net.URLEncoder
val result = URLEncoder.encode(user + ":" + pass, "UTF-8")

RESULT:

result: String = user%3Apass

Based on http://www.base64encode.org/ The value I am wanting for result should be "dXNlcjpwYXNz"

What is the site doing differently from these encodings? Also, how might I mimic the site in Java/Scala?

Note, the specific application is for a header using Basic Authentication.

if you want to make your own i have some example, i made Base64 for scala https://github.com/Try-Parser/Base64-encryption — HuntsMan
– HuntsMan, Commented Oct 26, 2016 at 5:42

Vladimir Matveev · Accepted Answer · 2014-08-19 05:59:03Z

98

Since Java 8 there are handy utility classes directly in the standard library: Base64.Decoder and Base64.Encoder. There are also some static factory methods to construct instances of these classes which perform Base64 encoding/decoding for various flavors of Base64 in Base64 class.

This is how to use the encoder:

import java.util.Base64
import java.nio.charset.StandardCharsets

Base64.getEncoder.encodeToString("user:pass".getBytes(StandardCharsets.UTF_8))

answered Aug 19, 2014 at 5:59

Vladimir Matveev

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1 Comment

Coder Guy Over a year ago

What's a suitable Java 7 alternative?

Louis Wasserman · Accepted Answer · 2013-08-14 20:03:36Z

18

To get "user:pass" to "dXNlcjpwYXNz", you should be base64-encoding the UTF-8 encoded string, but not hashing.

Using the third-party Guava library, I can run

System.out.println(BaseEncoding.base64()
    .encode("user:pass".getBytes(Charsets.UTF_8)));

and I get out

dXNlcjpwYXNz

as requested. The other Base64 encoders should work similarly.

edited Aug 14, 2013 at 20:03

answered Aug 14, 2013 at 19:57

Louis Wasserman

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2 Comments

Louis Wasserman Over a year ago

(Also, your second version with URLEncoder doesn't appear to actually do any hashing...or Base64 encoding...)

Erick Stone Over a year ago

Thank you! That was perfect. As for the second example, it was just to help rule out some of the answers that have been thrown at other similar questions.

Epicurist · Accepted Answer · 2014-11-12 13:45:31Z

12

Scala was asked:

import java.nio.charset.StandardCharsets

val (password, expected) = ("user:pass".getBytes(StandardCharsets.UTF_8), "dXNlcjpwYXNz")

assume(java.util.Base64.getEncoder.encodeToString(password)==expected)

answered Nov 12, 2014 at 13:45

Epicurist

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Comments

dcastro · Accepted Answer · 2015-10-03 20:33:28Z

7

If you're using scalaj (I was), you can simply do this:

import scalaj.http.Base64

Base64.encodeString(str)

Or

import scalaj.http.HttpConstants._

base64(str)

answered Oct 3, 2015 at 20:33

dcastro

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