SHA-256 Hash algorithms to test portability across platforms

sha256_test.js

var crypto = require("crypto");
var sha256 = crypto.createHash("sha256");

var pwd = "hcptest";
var salt = "7T0m4rKV5KXEaAL2PmtI8Rs9ehdM9csPOnQVgHe3U9A=";
var text2hash = pwd + salt;
var expected = "lDu2dH6lytKxG3MzCRWAjdXha03/WckYcc08nh0ZPBQ=";
sha256.update(text2hash, "utf8"); //utf8 here
var result = sha256.digest("base64");
console.log('Result:' + result);
console.log('Excpected:' + expected);

sha256_test.php

<?php
  $pwd = "hcptest";
  $salt = "7T0m4rKV5KXEaAL2PmtI8Rs9ehdM9csPOnQVgHe3U9A=";
  $expected = "lDu2dH6lytKxG3MzCRWAjdXha03/WckYcc08nh0ZPBQ=";
  $token = hash("sha256", $pwd.$salt, true);
  echo "\nText to hash: " . $text2hash;
  echo "\nYour token is:  " . $token;
  echo "\nBase 64 string is: " . base64_encode($token);
  echo "\nExpected: " . $expected;
?>

SHA256Test.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Security.Cryptography;
using System.Text;

public class SHA256Test
{
    public static void Main(string[] args)
    {
        Console.WriteLine("Result: " + HashPassword("hcptest", "7T0m4rKV5KXEaAL2PmtI8Rs9ehdM9csPOnQVgHe3U9A="));
        Console.WriteLine("Expected: lDu2dH6lytKxG3MzCRWAjdXha03/WckYcc08nh0ZPBQ=");
    }

    public static bool CheckPassword(string password, string salt, string hash)
    {
        return HashPassword(password, salt) == hash;
    }

    public static string HashPassword(string password, string salt)
    {
        string combined = password + salt;
        return HashString(combined);
    }

    public static string CreateSalt(int size)
    {
        RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
        byte[] buff = new byte[size];
        rng.GetBytes(buff);
        return Convert.ToBase64String(buff);
    }

    private static string HashString(string toHash)
    {
        using (SHA256 sha = SHA256.Create())
        {
            byte[] dataToHash = Encoding.UTF8.GetBytes(toHash);
            byte[] hashed = sha.ComputeHash(dataToHash);
            return Convert.ToBase64String(hashed);
        }
    }
}