CODEWITHSUNDEEP
javasha-3
gye
gye

Reputation: 1434

Calculating SHA 3 Hash in Java

I have been using CryptoJS (i.e. CryptoJS.algo.SHA3.creat()) library to SHA-3 hash on the front end. (see http://crypto-js.googlecode.com/svn/tags/3.1.2/build/rollups/sha3.js)

I was wondering if there are any Java library equivalence? But so far I haven't found any. There are not so many Java SHA-3 examples either.

sun.security.Provider has SHA-3, but it's not visible under Eclipse. Also, I am not sure whether this sun's SHA-3 is same as the CryptoJS's SHA-3.

Could anyone please provide some examples?

Upvotes: 30

Views: 39404

Answers (3)

Christopher Schultz
Christopher Schultz

Reputation: 20862

A new answer to an old question, in case others are searching like I was.

In Java 11 and later, there are 4 SHA-3 hashes available from the standard "Sun" security provider. Just ask for them by name with no other special configuration or code:

MessageDigest md = MessageDigest.getInstance("SHA3-256");

The other three available are SHA3-224, SHA3-384 and SHA3-512.

Official documentation of the supported MessageDigest algorithm names is available.

Upvotes: 2

Guillaume Husta
Guillaume Husta

Reputation: 4385

Thanks to @jdv for his answer. I'm adding more information to have a quick start and an example.

First, add the BouncyCastle maven dependency, or get it on Maven Central :

    <dependency>
        <groupId>org.bouncycastle</groupId>
        <artifactId>bcpkix-jdk15on</artifactId>
        <version>1.56</version>
    </dependency>

Then we can test it :

import org.bouncycastle.jcajce.provider.digest.SHA3;
import org.bouncycastle.util.encoders.Hex;
import org.junit.Test;

@Test
public void testSha3() throws Exception {
    String input = "Hello world !";
    SHA3.DigestSHA3 digestSHA3 = new SHA3.Digest512();
    byte[] digest = digestSHA3.digest(input.getBytes());

    System.out.println("SHA3-512 = " + Hex.toHexString(digest));
}

You'll get this result (512 bits or 64 bytes in hexadecimal) :

SHA3-512 = e9a4fd120d684537d57f314d51213ce5acef8ff6974e2b7599674ef0f0a3cf111f0d26ed602db946739da448210fb76a7621d7a8f07728372b10a975f36d8e37

You can compare it with this result : https://duckduckgo.com/?q=sha3+%22Hello+world+!%22&ia=answer

Upvotes: 27

user1531971
user1531971

Reputation:

The common Java reference implementation for crypto and crypto support is probably BouncyCastle. It can be a big library to bring in, which is why we often reach into sun.security (rightly or wrongly.)

Anyway, BouncyCastle seems to offer org.bouncycastle.jcajce.provider.digest.SHA3.DigestSHA3

Upvotes: 32

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