HMAC / SHA256 in different languagues

index.js

const crypto = require('crypto');

function encode(data, key) {
  return crypto
    .createHmac('sha256', key)
    .update(data)
    .digest('base64');
}

console.log(encode('{"foo":"bar"}', 's3cret'));

index.php

<?php

function encode($data, $key) {
  $hashed = hash_hmac('sha256', $data, $key, true);
  $encoded = base64_encode($hashed);
  return $encoded;
}

print(encode('{"foo":"bar"}', 's3cret'));

Main.java

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

class Main {
  public static String encode(String data, String key) throws InvalidKeyException, NoSuchAlgorithmException, UnsupportedEncodingException {
    Mac sha256 = Mac.getInstance("HmacSHA256");
    SecretKeySpec spec = new SecretKeySpec(key.getBytes("UTF-8"), "HmacSHA256");
    sha256.init(spec);
    byte[] hashed = sha256.doFinal(data.getBytes("UTF-8"));
    String encoded = Base64.getEncoder().encodeToString(hashed);

    return encoded;
}
  
  public static void main(String args[]) { 
    try {
      System.out.println(encode("{\"foo\":\"bar\"}", "s3cret")); 
    } catch (Exception e) {
      System.err.println(e.getMessage());
    }
  }
}

Program.cs

using System;
using System.Security.Cryptography;

class Program {
  static String encode(String data, String key) {
    var utf8 = System.Text.Encoding.UTF8;
    var sha256 = new HMACSHA256(utf8.GetBytes(key));
    var hashed = sha256.ComputeHash(utf8.GetBytes(data));
    var encoded = System.Convert.ToBase64String(hashed);

    return encoded;
  }

  static void Main(string[] args) {
    Console.WriteLine(encode("{\"foo\":\"bar\"}", "s3cret"));
  }
}