PHP SHA-256 not the same as this c# code?

Question

Got a problem - maybe... It seems that this piece of PHP:

$mydigestb = hash("sha256",$digeststring);

does not generate the same result as this C# code:

private string GenerateDigest(long currentTime)
{
    SHA256Managed hashString = new SHA256Managed();
    StringBuilder hex = new StringBuilder();
    byte[] hashValue = hashString.ComputeHash(Encoding.UTF8.GetBytes(String.Format("{0}{1}", currentTime, txtApiKey.Text)));
    foreach (byte x in hashValue)
    {
        hex.AppendFormat("{0:x2}", x);
    }
    return hex.ToString();
}

The input values are the same, but it appears that what comes out is different.

They are the same here for me. Show exact values for which you are testing it. Maybe character encoding differences? — Mormegil
– Mormegil, Commented Feb 21, 2014 at 22:29

Abhinav · Accepted Answer · 2014-02-21 22:44:52Z

1

It is the same for me:

PHP code: http://codepad.org/gcGC5Omp

<?php
$mydigestb = hash("sha256" , "abhinav" );
echo $mydigestb;
?>

C# code: https://ideone.com/jrz05O

using System;

public class Test
{
    public static void Main()
    {
        System.Security.Cryptography.SHA256Managed hm = new System.Security.Cryptography.SHA256Managed();
        byte[] hashValue = hm.ComputeHash(System.Text.Encoding.ASCII.GetBytes("abhinav"));
        Console.WriteLine(System.BitConverter.ToString(hashValue).Replace("-", "").ToLower());
    }
}

Are you using the same sample data?

answered Feb 21, 2014 at 22:44

Abhinav

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1 Comment

Fortytwo Over a year ago

You saved me. I was converting back to string incorrectly, and your snippet showed me the way. Thanks.

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