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827 daniel-mar 1 
<?php
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/**
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 * Raw DSA Key Handler
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 *
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 * PHP version 5
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 *
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 * Reads and creates arrays as DSA keys
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 *
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 * @author    Jim Wigginton <terrafrost@php.net>
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 * @copyright 2015 Jim Wigginton
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 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
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 * @link      http://phpseclib.sourceforge.net
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 */
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namespace phpseclib3\Crypt\DSA\Formats\Keys;
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use phpseclib3\Math\BigInteger;
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/**
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 * Raw DSA Key Handler
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 *
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 * @author  Jim Wigginton <terrafrost@php.net>
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 */
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abstract class Raw
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{
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    /**
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     * Break a public or private key down into its constituent components
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     *
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     * @param array $key
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     * @param string $password optional
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     * @return array
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     */
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    public static function load($key, $password = '')
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    {
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        if (!is_array($key)) {
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            throw new \UnexpectedValueException('Key should be a array - not a ' . gettype($key));
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        }
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        switch (true) {
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            case !isset($key['p']) || !isset($key['q']) || !isset($key['g']):
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            case !$key['p'] instanceof BigInteger:
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            case !$key['q'] instanceof BigInteger:
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            case !$key['g'] instanceof BigInteger:
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            case !isset($key['x']) && !isset($key['y']):
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            case isset($key['x']) && !$key['x'] instanceof BigInteger:
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            case isset($key['y']) && !$key['y'] instanceof BigInteger:
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                throw new \UnexpectedValueException('Key appears to be malformed');
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        }
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        $options = ['p' => 1, 'q' => 1, 'g' => 1, 'x' => 1, 'y' => 1];
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        return array_intersect_key($key, $options);
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    }
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    /**
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     * Convert a private key to the appropriate format.
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     *
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     * @param \phpseclib3\Math\BigInteger $p
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     * @param \phpseclib3\Math\BigInteger $q
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     * @param \phpseclib3\Math\BigInteger $g
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     * @param \phpseclib3\Math\BigInteger $y
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     * @param \phpseclib3\Math\BigInteger $x
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     * @param string $password optional
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     * @return string
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     */
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    public static function savePrivateKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y, BigInteger $x, $password = '')
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    {
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        return compact('p', 'q', 'g', 'y', 'x');
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    }
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    /**
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     * Convert a public key to the appropriate format
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     *
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     * @param \phpseclib3\Math\BigInteger $p
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     * @param \phpseclib3\Math\BigInteger $q
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     * @param \phpseclib3\Math\BigInteger $g
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     * @param \phpseclib3\Math\BigInteger $y
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     * @return string
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     */
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    public static function savePublicKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y)
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    {
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        return compact('p', 'q', 'g', 'y');
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    }
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}