SHA-3 code examples

SHA3-256 of the string "hello world" in every common language. Every snippet should print 644bcc7e564373040999aac89e7622f3ca71fba1d972fd94a31c3bfbf24e3938.

Python

import hashlib

print(hashlib.sha3_256(b"hello world").hexdigest())
print(hashlib.shake_256(b"hello world").hexdigest(32))  # SHAKE256, 32-byte output

Node.js

import { createHash } from "node:crypto";

console.log(createHash("sha3-256").update("hello world").digest("hex"));

JavaScript in the browser

The Web Crypto API does not include SHA-3, so use a library such as js-sha3 (the one this site uses):

import { sha3_256, keccak256 } from "js-sha3";

sha3_256("hello world");   // NIST SHA3-256
keccak256("hello world");  // Ethereum Keccak-256

Go

package main

import (
    "crypto/sha3" // Go 1.24+; older versions: golang.org/x/crypto/sha3
    "fmt"
)

func main() {
    fmt.Printf("%x", sha3.Sum256([]byte("hello world")))
}

Rust

// Cargo.toml: sha3 = "0.10", hex = "0.4"
use sha3::{Digest, Sha3_256};

fn main() {
    let hash = Sha3_256::digest(b"hello world");
    println!("{}", hex::encode(hash));
}

Java

import java.security.MessageDigest;
import java.util.HexFormat;

byte[] h = MessageDigest.getInstance("SHA3-256")
        .digest("hello world".getBytes(java.nio.charset.StandardCharsets.UTF_8));
System.out.println(HexFormat.of().formatHex(h)); // Java 17+

PHP

<?php
echo hash('sha3-256', 'hello world');

C# (.NET 8+)

using System.Security.Cryptography;
using System.Text;

if (SHA3_256.IsSupported)
{
    byte[] h = SHA3_256.HashData(Encoding.UTF8.GetBytes("hello world"));
    Console.WriteLine(Convert.ToHexString(h).ToLowerInvariant());
}

OpenSSL command line

printf "hello world" | openssl dgst -sha3-256
openssl dgst -sha3-512 myfile.bin

Need Ethereum-compatible hashes instead? See SHA-3 vs Keccak-256.