/home/kueuepay/public_html/vendor/phpseclib/phpseclib/phpseclib/Crypt/DH.php
<?php

/**
 * Pure-PHP (EC)DH implementation
 *
 * PHP version 5
 *
 * Here's an example of how to compute a shared secret with this library:
 * <code>
 * <?php
 * include 'vendor/autoload.php';
 *
 * $ourPrivate = \phpseclib3\Crypt\DH::createKey();
 * $secret = DH::computeSecret($ourPrivate, $theirPublic);
 *
 * ?>
 * </code>
 *
 * @author    Jim Wigginton <terrafrost@php.net>
 * @copyright 2016 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://phpseclib.sourceforge.net
 */

namespace phpseclib3\Crypt;

use phpseclib3\Crypt\Common\AsymmetricKey;
use phpseclib3\Crypt\DH\Parameters;
use phpseclib3\Crypt\DH\PrivateKey;
use phpseclib3\Crypt\DH\PublicKey;
use phpseclib3\Exception\NoKeyLoadedException;
use phpseclib3\Exception\UnsupportedOperationException;
use phpseclib3\Math\BigInteger;

/**
 * Pure-PHP (EC)DH implementation
 *
 * @author  Jim Wigginton <terrafrost@php.net>
 */
abstract class DH extends AsymmetricKey
{
    /**
     * Algorithm Name
     *
     * @var string
     */
    const ALGORITHM = 'DH';

    /**
     * DH prime
     *
     * @var \phpseclib3\Math\BigInteger
     */
    protected $prime;

    /**
     * DH Base
     *
     * Prime divisor of p-1
     *
     * @var \phpseclib3\Math\BigInteger
     */
    protected $base;

    /**
     * Public Key
     *
     * @var \phpseclib3\Math\BigInteger
     */
    protected $publicKey;

    /**
     * Create DH parameters
     *
     * This method is a bit polymorphic. It can take any of the following:
     *  - two BigInteger's (prime and base)
     *  - an integer representing the size of the prime in bits (the base is assumed to be 2)
     *  - a string (eg. diffie-hellman-group14-sha1)
     *
     * @return Parameters
     */
    public static function createParameters(...$args)
    {
        $class = new \ReflectionClass(static::class);
        if ($class->isFinal()) {
            throw new \RuntimeException('createParameters() should not be called from final classes (' . static::class . ')');
        }

        $params = new Parameters();
        if (count($args) == 2 && $args[0] instanceof BigInteger && $args[1] instanceof BigInteger) {
            //if (!$args[0]->isPrime()) {
            //    throw new \InvalidArgumentException('The first parameter should be a prime number');
            //}
            $params->prime = $args[0];
            $params->base = $args[1];
            return $params;
        } elseif (count($args) == 1 && is_numeric($args[0])) {
            $params->prime = BigInteger::randomPrime($args[0]);
            $params->base = new BigInteger(2);
            return $params;
        } elseif (count($args) != 1 || !is_string($args[0])) {
            throw new \InvalidArgumentException('Valid parameters are either: two BigInteger\'s (prime and base), a single integer (the length of the prime; base is assumed to be 2) or a string');
        }
        switch ($args[0]) {
            // see http://tools.ietf.org/html/rfc2409#section-6.2 and
            // http://tools.ietf.org/html/rfc2412, appendex E
            case 'diffie-hellman-group1-sha1':
                $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
                         '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
                         '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
                         'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF';
                break;
            // see http://tools.ietf.org/html/rfc3526#section-3
            case 'diffie-hellman-group14-sha1': // 2048-bit MODP Group
            case 'diffie-hellman-group14-sha256':
                $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
                         '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
                         '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
                         'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' .
                         '98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' .
                         '9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
                         'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' .
                         '3995497CEA956AE515D2261898FA051015728E5A8AACAA68FFFFFFFFFFFFFFFF';
                break;
            // see https://tools.ietf.org/html/rfc3526#section-4
            case 'diffie-hellman-group15-sha512': // 3072-bit MODP Group
                $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
                         '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
                         '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
                         'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' .
                         '98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' .
                         '9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
                         'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' .
                         '3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D04507A33' .
                         'A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7' .
                         'ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6BF12FFA06D98A0864' .
                         'D87602733EC86A64521F2B18177B200CBBE117577A615D6C770988C0BAD946E2' .
                         '08E24FA074E5AB3143DB5BFCE0FD108E4B82D120A93AD2CAFFFFFFFFFFFFFFFF';
                break;
            // see https://tools.ietf.org/html/rfc3526#section-5
            case 'diffie-hellman-group16-sha512': // 4096-bit MODP Group
                $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
                         '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
                         '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
                         'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' .
                         '98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' .
                         '9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
                         'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' .
                         '3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D04507A33' .
                         'A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7' .
                         'ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6BF12FFA06D98A0864' .
                         'D87602733EC86A64521F2B18177B200CBBE117577A615D6C770988C0BAD946E2' .
                         '08E24FA074E5AB3143DB5BFCE0FD108E4B82D120A92108011A723C12A787E6D7' .
                         '88719A10BDBA5B2699C327186AF4E23C1A946834B6150BDA2583E9CA2AD44CE8' .
                         'DBBBC2DB04DE8EF92E8EFC141FBECAA6287C59474E6BC05D99B2964FA090C3A2' .
                         '233BA186515BE7ED1F612970CEE2D7AFB81BDD762170481CD0069127D5B05AA9' .
                         '93B4EA988D8FDDC186FFB7DC90A6C08F4DF435C934063199FFFFFFFFFFFFFFFF';
                break;
            // see https://tools.ietf.org/html/rfc3526#section-6
            case 'diffie-hellman-group17-sha512': // 6144-bit MODP Group
                $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
                         '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
                         '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
                         'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' .
                         '98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' .
                         '9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
                         'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' .
                         '3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D04507A33' .
                         'A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7' .
                         'ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6BF12FFA06D98A0864' .
                         'D87602733EC86A64521F2B18177B200CBBE117577A615D6C770988C0BAD946E2' .
                         '08E24FA074E5AB3143DB5BFCE0FD108E4B82D120A92108011A723C12A787E6D7' .
                         '88719A10BDBA5B2699C327186AF4E23C1A946834B6150BDA2583E9CA2AD44CE8' .
                         'DBBBC2DB04DE8EF92E8EFC141FBECAA6287C59474E6BC05D99B2964FA090C3A2' .
                         '233BA186515BE7ED1F612970CEE2D7AFB81BDD762170481CD0069127D5B05AA9' .
                         '93B4EA988D8FDDC186FFB7DC90A6C08F4DF435C93402849236C3FAB4D27C7026' .
                         'C1D4DCB2602646DEC9751E763DBA37BDF8FF9406AD9E530EE5DB382F413001AE' .
                         'B06A53ED9027D831179727B0865A8918DA3EDBEBCF9B14ED44CE6CBACED4BB1B' .
                         'DB7F1447E6CC254B332051512BD7AF426FB8F401378CD2BF5983CA01C64B92EC' .
                         'F032EA15D1721D03F482D7CE6E74FEF6D55E702F46980C82B5A84031900B1C9E' .
                         '59E7C97FBEC7E8F323A97A7E36CC88BE0F1D45B7FF585AC54BD407B22B4154AA' .
                         'CC8F6D7EBF48E1D814CC5ED20F8037E0A79715EEF29BE32806A1D58BB7C5DA76' .
                         'F550AA3D8A1FBFF0EB19CCB1A313D55CDA56C9EC2EF29632387FE8D76E3C0468' .
                         '043E8F663F4860EE12BF2D5B0B7474D6E694F91E6DCC4024FFFFFFFFFFFFFFFF';
                break;
            // see https://tools.ietf.org/html/rfc3526#section-7
            case 'diffie-hellman-group18-sha512': // 8192-bit MODP Group
                $prime = 'FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74' .
                         '020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F1437' .
                         '4FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED' .
                         'EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A163BF05' .
                         '98DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208552BB' .
                         '9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B' .
                         'E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF695581718' .
                         '3995497CEA956AE515D2261898FA051015728E5A8AAAC42DAD33170D04507A33' .
                         'A85521ABDF1CBA64ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7' .
                         'ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6BF12FFA06D98A0864' .
                         'D87602733EC86A64521F2B18177B200CBBE117577A615D6C770988C0BAD946E2' .
                         '08E24FA074E5AB3143DB5BFCE0FD108E4B82D120A92108011A723C12A787E6D7' .
                         '88719A10BDBA5B2699C327186AF4E23C1A946834B6150BDA2583E9CA2AD44CE8' .
                         'DBBBC2DB04DE8EF92E8EFC141FBECAA6287C59474E6BC05D99B2964FA090C3A2' .
                         '233BA186515BE7ED1F612970CEE2D7AFB81BDD762170481CD0069127D5B05AA9' .
                         '93B4EA988D8FDDC186FFB7DC90A6C08F4DF435C93402849236C3FAB4D27C7026' .
                         'C1D4DCB2602646DEC9751E763DBA37BDF8FF9406AD9E530EE5DB382F413001AE' .
                         'B06A53ED9027D831179727B0865A8918DA3EDBEBCF9B14ED44CE6CBACED4BB1B' .
                         'DB7F1447E6CC254B332051512BD7AF426FB8F401378CD2BF5983CA01C64B92EC' .
                         'F032EA15D1721D03F482D7CE6E74FEF6D55E702F46980C82B5A84031900B1C9E' .
                         '59E7C97FBEC7E8F323A97A7E36CC88BE0F1D45B7FF585AC54BD407B22B4154AA' .
                         'CC8F6D7EBF48E1D814CC5ED20F8037E0A79715EEF29BE32806A1D58BB7C5DA76' .
                         'F550AA3D8A1FBFF0EB19CCB1A313D55CDA56C9EC2EF29632387FE8D76E3C0468' .
                         '043E8F663F4860EE12BF2D5B0B7474D6E694F91E6DBE115974A3926F12FEE5E4' .
                         '38777CB6A932DF8CD8BEC4D073B931BA3BC832B68D9DD300741FA7BF8AFC47ED' .
                         '2576F6936BA424663AAB639C5AE4F5683423B4742BF1C978238F16CBE39D652D' .
                         'E3FDB8BEFC848AD922222E04A4037C0713EB57A81A23F0C73473FC646CEA306B' .
                         '4BCBC8862F8385DDFA9D4B7FA2C087E879683303ED5BDD3A062B3CF5B3A278A6' .
                         '6D2A13F83F44F82DDF310EE074AB6A364597E899A0255DC164F31CC50846851D' .
                         'F9AB48195DED7EA1B1D510BD7EE74D73FAF36BC31ECFA268359046F4EB879F92' .
                         '4009438B481C6CD7889A002ED5EE382BC9190DA6FC026E479558E4475677E9AA' .
                         '9E3050E2765694DFC81F56E880B96E7160C980DD98EDD3DFFFFFFFFFFFFFFFFF';
                break;
            default:
                throw new \InvalidArgumentException('Invalid named prime provided');
        }

        $params->prime = new BigInteger($prime, 16);
        $params->base = new BigInteger(2);

        return $params;
    }

    /**
     * Create public / private key pair.
     *
     * The rationale for the second parameter is described in http://tools.ietf.org/html/rfc4419#section-6.2 :
     *
     * "To increase the speed of the key exchange, both client and server may
     *  reduce the size of their private exponents.  It should be at least
     *  twice as long as the key material that is generated from the shared
     *  secret.  For more details, see the paper by van Oorschot and Wiener
     *  [VAN-OORSCHOT]."
     *
     * $length is in bits
     *
     * @param Parameters $params
     * @param int $length optional
     * @return DH\PrivateKey
     */
    public static function createKey(Parameters $params, $length = 0)
    {
        $class = new \ReflectionClass(static::class);
        if ($class->isFinal()) {
            throw new \RuntimeException('createKey() should not be called from final classes (' . static::class . ')');
        }

        $one = new BigInteger(1);
        if ($length) {
            $max = $one->bitwise_leftShift($length);
            $max = $max->subtract($one);
        } else {
            $max = $params->prime->subtract($one);
        }

        $key = new PrivateKey();
        $key->prime = $params->prime;
        $key->base = $params->base;
        $key->privateKey = BigInteger::randomRange($one, $max);
        $key->publicKey = $key->base->powMod($key->privateKey, $key->prime);
        return $key;
    }

    /**
     * Compute Shared Secret
     *
     * @param PrivateKey|EC $private
     * @param PublicKey|BigInteger|string $public
     * @return mixed
     */
    public static function computeSecret($private, $public)
    {
        if ($private instanceof PrivateKey) { // DH\PrivateKey
            switch (true) {
                case $public instanceof PublicKey:
                    if (!$private->prime->equals($public->prime) || !$private->base->equals($public->base)) {
                        throw new \InvalidArgumentException('The public and private key do not share the same prime and / or base numbers');
                    }
                    return $public->publicKey->powMod($private->privateKey, $private->prime)->toBytes(true);
                case is_string($public):
                    $public = new BigInteger($public, -256);
                    // fall-through
                case $public instanceof BigInteger:
                    return $public->powMod($private->privateKey, $private->prime)->toBytes(true);
                default:
                    throw new \InvalidArgumentException('$public needs to be an instance of DH\PublicKey, a BigInteger or a string');
            }
        }

        if ($private instanceof EC\PrivateKey) {
            switch (true) {
                case $public instanceof EC\PublicKey:
                    $public = $public->getEncodedCoordinates();
                    // fall-through
                case is_string($public):
                    $point = $private->multiply($public);
                    switch ($private->getCurve()) {
                        case 'Curve25519':
                        case 'Curve448':
                            $secret = $point;
                            break;
                        default:
                            // according to https://www.secg.org/sec1-v2.pdf#page=33 only X is returned
                            $secret = substr($point, 1, (strlen($point) - 1) >> 1);
                    }
                    /*
                    if (($secret[0] & "\x80") === "\x80") {
                        $secret = "\0$secret";
                    }
                    */
                    return $secret;
                default:
                    throw new \InvalidArgumentException('$public needs to be an instance of EC\PublicKey or a string (an encoded coordinate)');
            }
        }
    }

    /**
     * Load the key
     *
     * @param string $key
     * @param string $password optional
     * @return AsymmetricKey
     */
    public static function load($key, $password = false)
    {
        try {
            return EC::load($key, $password);
        } catch (NoKeyLoadedException $e) {
        }

        return parent::load($key, $password);
    }

    /**
     * OnLoad Handler
     *
     * @return bool
     */
    protected static function onLoad(array $components)
    {
        if (!isset($components['privateKey']) && !isset($components['publicKey'])) {
            $new = new Parameters();
        } else {
            $new = isset($components['privateKey']) ?
                new PrivateKey() :
                new PublicKey();
        }

        $new->prime = $components['prime'];
        $new->base = $components['base'];

        if (isset($components['privateKey'])) {
            $new->privateKey = $components['privateKey'];
        }
        if (isset($components['publicKey'])) {
            $new->publicKey = $components['publicKey'];
        }

        return $new;
    }

    /**
     * Determines which hashing function should be used
     *
     * @param string $hash
     */
    public function withHash($hash)
    {
        throw new UnsupportedOperationException('DH does not use a hash algorithm');
    }

    /**
     * Returns the hash algorithm currently being used
     *
     */
    public function getHash()
    {
        throw new UnsupportedOperationException('DH does not use a hash algorithm');
    }

    /**
     * Returns the parameters
     *
     * A public / private key is only returned if the currently loaded "key" contains an x or y
     * value.
     *
     * @see self::getPublicKey()
     * @return mixed
     */
    public function getParameters()
    {
        $type = DH::validatePlugin('Keys', 'PKCS1', 'saveParameters');

        $key = $type::saveParameters($this->prime, $this->base);
        return DH::load($key, 'PKCS1');
    }
}
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In the digital age, privacy concerns have become increasingly paramount, prompting the European Union to enact the General Data Protection Regulation (GDPR) in 2018. Among its many provisions, GDPR sets strict guidelines for the collection and processing of personal data, including the use of cookies on websites. Privacy Policy