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File: application/modules/extensions/aws/Aws/PhpHash.php

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File: application/modules/extensions/aws/Aws/PhpHash.php
Role: Application script
Content type: text/plain
Description: Initial
Class: Pretty PHP S3 Files Manager
Web based interface to manage files in Amazon S3
Author: By
Last change:
Date: 3 years ago
Size: 1,824 bytes
 

 

Contents

Class file image Download
<?php
namespace Aws;

/**
 * Incremental hashing using PHP's hash functions.
 */
class PhpHash implements HashInterface
{
   
/** @var resource */
   
private $context;

   
/** @var string */
   
private $algo;

   
/** @var array */
   
private $options;

   
/** @var string */
   
private $hash;

   
/**
     * @param string $algo Hashing algorithm. One of PHP's hash_algos()
     * return values (e.g. md5, sha1, etc...).
     * @param array $options Associative array of hashing options:
     * - key: Secret key used with the hashing algorithm.
     * - base64: Set to true to base64 encode the value when complete.
     */
   
public function __construct($algo, array $options = [])
    {
       
$this->algo = $algo;
       
$this->options = $options;
    }

    public function
update($data)
    {
        if (
$this->hash !== null) {
           
$this->reset();
        }

       
hash_update($this->getContext(), $data);
    }

    public function
complete()
    {
        if (
$this->hash) {
            return
$this->hash;
        }

       
$this->hash = hash_final($this->getContext(), true);

        if (isset(
$this->options['base64']) && $this->options['base64']) {
           
$this->hash = base64_encode($this->hash);
        }

        return
$this->hash;
    }

    public function
reset()
    {
       
$this->context = $this->hash = null;
    }

   
/**
     * Get a hash context or create one if needed
     *
     * @return resource
     */
   
private function getContext()
    {
        if (!
$this->context) {
           
$key = isset($this->options['key']) ? $this->options['key'] : null;
           
$this->context = hash_init(
               
$this->algo,
               
$key ? HASH_HMAC : 0,
               
$key
           
);
        }

        return
$this->context;
    }
}