CODEWITHSUNDEEP
c#phpvb.net
jon xz
jon xz

Reputation: 31

Convert PHP HMAC SHA256 to C#

I need to convert the following PHP code in C#:

$hash = hash_hmac('SHA256',"ent",'key',true);
echo rtrim(strtr(base64_encode($hash), '+/', '-_'), '=');

I use the following C# code:(FROM HERE)

private static string hmacSHA256(String data, String key)
{
    using (HMACSHA256 hmac = new HMACSHA256(Encoding.ASCII.GetBytes(key))) {
        byte[] a2 = hmac.ComputeHash(Encoding.ASCII.GetBytes(data));
        string a3 = Convert.ToBase64String(a2).ToString.Replace("+", "-").Replace("/", "_").Replace("=", "");
        return a3;
    }
}

But the results are not the same.

PHP results : Xt0hGF_wcArzx4urxfbHUpOp2eEXvtGTDekGtQw5JTo

c# results : FnM4gpRRlapTZcO5iAIlEXEqU5iFT1hYcmQ1rY7ZINE

Upvotes: 3

Views: 1561

Answers (1)

Visual Vincent
Visual Vincent

Reputation: 18320

I just tested both your codes and they work fine. I passed abcdefgh and secretkey as parameters and they give the same result.

It would've been good if you checked your actual input before asking.

C# code (fiddle):

Console.WriteLine(hmacSHA256("abcdefgh", "secretkey"));

Outputs:

d2AI63oXm2Q5VDCCjLvBrwKr-gT6vZcizD6BCq1rRjc

PHP code (make the fiddle yourself):

<?php
    $hash = hash_hmac('SHA256',"abcdefgh",'secretkey',true);
    echo rtrim(strtr(base64_encode($hash), '+/', '-_'), '=');
?>

Outputs:

d2AI63oXm2Q5VDCCjLvBrwKr-gT6vZcizD6BCq1rRjc


Your issue resides elsewhere.

Upvotes: 2

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