CODEWITHSUNDEEP
c#php
itika agrawal
itika agrawal

Reputation: 29

c# HMACSHA256 encription to HMACSHA256 in php

I am trying to generating the hash in PHP but not getting the same output as I get from c# in my code so which encryption algorithm(or what should I change in my code) should I use. the code that I am using in PHP and c#-

php code

<?php

$date = gmdate("Y-m-d H:i:s\Z");
$ServiceAPIKey = "abc";
    $ServiceAPIPassword = "def";
    $serviceId = "1234";

        $message = $serviceId.$date;

$signature = $ServiceAPIKey.":".base64_encode(hash_hmac('sha256', $message, $ServiceAPIPassword,true));
echo $signature;
?>

c# code

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


public class Program
{
    public static void Main()
    {
        var dateString = DateTime.UtcNow.ToString("u");
var serviceId = "1234";
string ServiceAPIKey = "abc";
string ServiceAPIPassword = "def";
var signature = "";

        var signature = CalculateSignature(ServiceAPIKey, ServiceAPIPassword, message);
        Console.WriteLine(signature );
    }

    public static string CalculateSignature(string ServiceAPIKey, string ServiceAPIPassword, string message)
    {
        string hashString =string.Empty;

        using (var hmac = new HMACSHA256(Encoding.UTF8.GetBytes(ServiceAPIPassword)))
        {
            var hash = hmac.ComputeHash(Encoding.UTF8.GetBytes(message));
            hashString = Convert.ToBase64String(hash);
        }

        hashString = ServiceAPIKey + ":" + hashString;
        return hashString;
    }
}

I expect this - abc:DWe/a/aZrapRALbgZLJzx6m1ndaM7RP1hRxCFyBlZo0= o/p that I am getting from mine php code. php o/p that I am getting is abc:14w9U25MPeZ8Wg4lavtrG+IN/UyTe68wEV/Z1fkLLhc=

Upvotes: 2

Views: 75

Answers (1)

Rasa Mohamed
Rasa Mohamed

Reputation: 892

You have to make same date on both c# and PHP. if you are using this $date = gmdate("Y-m-d H:i:s\Z"); in $message = $serviceId.$date; then this H:i:s will vary on both while executing. Use same date only on both the language then try with following code in php

<?php
$date = gmdate("Y-m-d"); // 2019-05-15 use the same in C#
$ServiceAPIKey = "abc";
$ServiceAPIPassword = "def";
$serviceId = "1234";

$message = $serviceId.$date;

//$message = strtolower($message); //Not needed
$signature = hash_hmac("sha256", utf8_encode($message), utf8_encode($ServiceAPIPassword), false);
// Convert hexadecimal string to binary and then to base64
$signature = hex2bin($signature);
$signature = base64_encode($signature);

echo $ServiceAPIKey.":".$signature . "<br>\n";
?>

Upvotes: 1

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