Getting issue when convert c# code to PHP as below

Question

I am running this code:

var timeStamp = DateTime.UtcNow;
var sharedSecret = "xx";
var saltedString = timeStamp.ToString("2021-01-07T16:42:33.619667Z") + sharedSecret;

//Encoding saltedString using Unicode little-endian byte order
byte[] encodedSaltedString = Encoding.Unicode.GetBytes(saltedString);

//Hashing Algorithm used is SHA512
HashAlgorithm hash = new SHA512Managed();

//Compute Hash of encodedSaltedString
byte[] hashedEncodedString = hash.ComputeHash(encodedSaltedString);

//Convert hashed array to base64-encoded string
string signature = Convert.ToBase64String(hashedEncodedString);

I am then getting this result in C#: "gQhjrLnY6fo44EeaaWaUBE1PY/8oEIRsUcK3AMSCVUCYMM4vRfxvQEEggXaHTF0GQbw4w2HbWArX1k6NnkzJFg=="

I converted to this code as below, but I am getting an issue. Can I get some help on this?

$timestamp = "2021-01-07T16:42:33.619667Z";
$sharedSecret = 'xx';
$saltedString = $timestamp.$sharedSecret;

$utf=mb_convert_encoding($saltedString, "UTF-16LE");

$signature = base64_encode(hash('sha512', $utf));

IN PHP I am getting this result: ODEwODYzYWNiOWQ4ZTlmYTM4ZTA0NzlhNjk2Njk0MDQ0ZDRmNjNmZjI4MTA4NDZjNTFjMmI3MDBjNDgyNTU0MDk4MzBjZTJmNDVmYzZmNDA0MTIwODE3Njg3NGM1ZDA2NDFiYzM4YzM2MWRiNTgwYWQ3ZDY0ZThkOWU0Y2M5MTY=

But both should be same. The c# one is correct, I want the same in the php code as well.

What exactly does "and its not working" mean? Empty page? Wrong result? Any errors? — user8034901
– user8034901, Commented Jan 7, 2021 at 17:26
Tested, I am getting what looks like a SHA hash -- I don't see an issue? What is your expected result, and what result are you getting instead? — Zak
– Zak, Commented Jan 7, 2021 at 17:29
Also note that PHP's hash function returns lower-case hexits by default, whereas C#'s is returning bytes, which is responsible for the length difference. Use hash('sha512', $utf, true) to get the same length output. I found that by glancing at the PHP manual for hash, which is something you should always do — canton7
– canton7, Commented Jan 7, 2021 at 17:41

canton7 · Accepted Answer · 2021-01-08 09:07:37Z

1

From the PHP docs for hash:

hash ( string $algo , string $data , bool $binary = false ) : string|false
binary
When set to true, outputs raw binary data. false outputs lowercase hexits.

You're not passing a value for $binary, so it's returning a string of hexadecimal characters.

The C# HashAlgorithm.ComputeHash method on the other hand binary data.

Since you're base64-encoding the result, you're presumably expecting the hash function to return binary data. You therefore need to pass true as the value for $binary:

$signature = base64_encode(hash('sha512', $utf, true));

answered Jan 8, 2021 at 9:07

canton7

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