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<?php
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namespace Aws;
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/**
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 * Incremental hashing using PHP's hash functions.
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 */
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class PhpHash implements HashInterface
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{
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    /** @var resource|\HashContext */
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    private $context;
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    /** @var string */
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    private $algo;
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    /** @var array */
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    private $options;
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    /** @var string */
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    private $hash;
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    /**
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     * @param string $algo Hashing algorithm. One of PHP's hash_algos()
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     *     return values (e.g. md5, sha1, etc...).
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     * @param array  $options Associative array of hashing options:
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     *     - key: Secret key used with the hashing algorithm.
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     *     - base64: Set to true to base64 encode the value when complete.
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     */
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    public function __construct($algo, array $options = [])
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    {
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        $this->algo = $algo;
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        $this->options = $options;
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    }
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    public function update($data)
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    {
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        if ($this->hash !== null) {
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            $this->reset();
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        }
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        hash_update($this->getContext(), $data);
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    }
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    public function complete()
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    {
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        if ($this->hash) {
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            return $this->hash;
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        }
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        $this->hash = hash_final($this->getContext(), true);
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        if (isset($this->options['base64']) && $this->options['base64']) {
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            $this->hash = base64_encode($this->hash);
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        }
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        return $this->hash;
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    }
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    public function reset()
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    {
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        $this->context = $this->hash = null;
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    }
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    /**
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     * Get a hash context or create one if needed
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     *
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     * @return resource|\HashContext
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     */
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    private function getContext()
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    {
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        if (!$this->context) {
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            $key = isset($this->options['key']) ? $this->options['key'] : '';
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            $this->context = hash_init(
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                $this->algo,
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                $key ? HASH_HMAC : 0,
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                $key
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            );
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        }
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        return $this->context;
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    }
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}