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26 lines
768 B
PHP
26 lines
768 B
PHP
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<?php
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/**
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* Symfony polyfill for php < 5.5
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*
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* @author Sebastiaan Stok <s.stok@rollerscapes.net>
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* @link https://github.com/symfony/polyfill-php55/blob/master/Php55.php
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*/
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function hash_pbkdf2($algorithm, $password, $salt, $iterations, $length = 0, $rawOutput = false)
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{
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// Number of blocks needed to create the derived key
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$blocks = ceil($length / strlen(hash($algorithm, null, true)));
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$digest = '';
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for ($i = 1; $i <= $blocks; ++$i) {
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$ib = $block = hash_hmac($algorithm, $salt.pack('N', $i), $password, true);
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// Iterations
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for ($j = 1; $j < $iterations; ++$j) {
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$ib ^= ($block = hash_hmac($algorithm, $block, $password, true));
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}
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$digest .= $ib;
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}
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if (!$rawOutput) {
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$digest = bin2hex($digest);
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}
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return substr($digest, 0, $length);
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}
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