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/**
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/**
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 * Ed25519
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 * Ed25519
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 *
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 *
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 * PHP version 5 and 7
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 * PHP version 5 and 7
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 *
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 *
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 * @category  Crypt
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 * @package   EC
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 * @author    Jim Wigginton <terrafrost@php.net>
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 * @author    Jim Wigginton <terrafrost@php.net>
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 * @copyright 2017 Jim Wigginton
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 * @copyright 2017 Jim Wigginton
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 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
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 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
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 */
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 */
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     * Implements steps 1-3 at https://tools.ietf.org/html/rfc8032#section-5.1.5
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     * Implements steps 1-3 at https://tools.ietf.org/html/rfc8032#section-5.1.5
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     *
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     *
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     * Used by the various key handlers
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     * Used by the various key handlers
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     *
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     *
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     * @param string $str
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     * @param string $str
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     * @return \phpseclib3\Math\PrimeField\Integer
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     * @return array
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     */
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     */
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    public function extractSecret($str)
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    public function extractSecret($str)
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    {
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    {
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        if (strlen($str) != 32) {
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        if (strlen($str) != 32) {
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            throw new \LengthException('Private Key should be 32-bytes long');
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            throw new \LengthException('Private Key should be 32-bytes long');
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        $h[0] = ($h[0] & chr(0x3F)) | chr(0x40);
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        $h[0] = ($h[0] & chr(0x3F)) | chr(0x40);
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        // 3.  Interpret the buffer as the little-endian integer, forming a
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        // 3.  Interpret the buffer as the little-endian integer, forming a
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        //     secret scalar s.
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        //     secret scalar s.
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        $dA = new BigInteger($h, 256);
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        $dA = new BigInteger($h, 256);
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        return [
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            'dA' => $dA,
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        $dA->secret = $str;
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            'secret' => $str
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        return $dA;
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        ];
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    }
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    }
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    /**
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    /**
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     * Encode a point as a string
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     * Encode a point as a string
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     *
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     *
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     *
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     *
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     * @return \phpseclib3\Math\PrimeField\Integer
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     * @return \phpseclib3\Math\PrimeField\Integer
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     */
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     */
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    public function createRandomMultiplier()
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    public function createRandomMultiplier()
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    {
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    {
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        return $this->extractSecret(Random::string(32));
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        return $this->extractSecret(Random::string(32))['dA'];
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    }
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    }
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    /**
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    /**
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     * Converts an affine point to an extended homogeneous coordinate
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     * Converts an affine point to an extended homogeneous coordinate
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     *
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     *