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@ 2018-10-31T12:08:32Z

<?php

define('SECRET', 'private-key');

$payload = [
    "id" => 1,
    "username" => "test@example.com",
    "created_at" => "2018-10-11 13:30:29",
    "updated_at" => "2018-10-17 11:17:14"
];

echo verifySignature(SECRET, 'https://example.com/webhook', $payload, 1517949000);

function verifySignature(string $secret, string $webhookUrl, array $payload, int $timestamp): string
{
    $jsonPayload = json_encode($payload);

    $stringToSign  = "NORDWL-HMAC-SHA256\n";
    $stringToSign .= sprintf("Timestamp %d\n", $timestamp);
    $stringToSign .= hash('sha256', $jsonPayload);

    $timestampKey = hash_hmac('sha256', $timestamp, 'NORDWL' . $secret, true);
    $signingKey = hash_hmac('sha256', $webhookUrl, $timestampKey, true);

    return hash_hmac('sha256', $stringToSign, $signingKey);
}

Output for git.master_jit, git.master, rfc.property-hooks: 61994df60c552042e781c3c1acf5100d553647c668c1ef230bf8be585b8cff0c

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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