XHubSignature256.php
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XHubSignature256.php
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	<?php

	namespace Keruald\GitHub;

	class XHubSignature256 extends XHubSignature {

	const string DEFAULT_ALGO = "sha256";

	/**
	* Initializes a new instance of the XHubSignature256 class
	*
	* @param string $secret the secret token
	* @param string $algo the hash algorithm [facultative]
	*/
	public function __construct ($secret, $algo = self::DEFAULT_ALGO) {
	parent::__construct($secret, $algo);
	}

	///
	/// Static helper methods
	///

	/**
	* Computes a signature for the specified secret and payload
	*
	* @param string $secret the secret token to secure messages
	* @param string $payload the payload
	* @param string $algo the hash algorithm [facultative]
	*
	* @return string the payload signature
	*/
	public static function hashPayload(
	$secret,
	$payload,
	$algo = self::DEFAULT_ALGO,
	) {
	$instance = new static($secret, $algo);
	$instance->payload = $payload;

	return $instance->compute();
	}

	/**
	* Validates a payload against specified secret
	*
	* @param string $secret the secret token to secure messages
	* @param string $payload the payload
	* @param string $signature the signature delivered with the payload
	* @param string $algo the hash algorithm [facultative]
	*
	* @return bool true if the signature is correct; otherwise, false.
	*/
	public static function validatePayload (
	$secret,
	$payload,
	$signature,
	$algo = self::DEFAULT_ALGO,
	) {
	$instance = new static($secret, $algo);
	$instance->payload = $payload;
	$instance->signature = $signature;

	return $instance->validate();
	}

	}