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<?php

/**
 * Curve25519
 *
 * PHP version 5 and 7
 *
 * @author    Jim Wigginton <terrafrost@php.net>
 * @copyright 2019 Jim Wigginton
 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
 * @link      http://pear.php.net/package/Math_BigInteger
 */

namespace phpseclib3\Crypt\EC\Curves;

use phpseclib3\Crypt\EC\BaseCurves\Montgomery;
use phpseclib3\Math\BigInteger;

class Curve25519 extends Montgomery
{
    public function __construct()
    {
        // 2^255 - 19
        $this->setModulo(new BigInteger('7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFED', 16));
        $this->a24 = $this->factory->newInteger(new BigInteger('121666'));
        $this->p = [$this->factory->newInteger(new BigInteger(9))];
        // 2^252 + 0x14def9dea2f79cd65812631a5cf5d3ed
        $this->setOrder(new BigInteger('1000000000000000000000000000000014DEF9DEA2F79CD65812631A5CF5D3ED', 16));

/*
        $this->setCoefficients(
            new BigInteger('486662'), // a
        );
        $this->setBasePoint(
            new BigInteger(9),
            new BigInteger('14781619447589544791020593568409986887264606134616475288964881837755586237401')
        );
        */
    }

/**
     * Multiply a point on the curve by a scalar
     *
     * Modifies the scalar as described at https://tools.ietf.org/html/rfc7748#page-8
     *
     * @return array
     */
    public function multiplyPoint(array $p, BigInteger $d)
    {
        //$r = strrev(sodium_crypto_scalarmult($d->toBytes(), strrev($p[0]->toBytes())));
        //return [$this->factory->newInteger(new BigInteger($r, 256))];

$d = $d->toBytes();
        $d &= "\xF8" . str_repeat("\xFF", 30) . "\x7F";
        $d = strrev($d);
        $d |= "\x40";
        $d = new BigInteger($d, -256);

return parent::multiplyPoint($p, $d);
    }

/**
     * Creates a random scalar multiplier
     *
     * @return BigInteger
     */
    public function createRandomMultiplier()
    {
        return BigInteger::random(256);
    }

/**
     * Performs range check
     */
    public function rangeCheck(BigInteger $x)
    {
        if ($x->getLength() > 256 || $x->isNegative()) {
            throw new \RangeException('x must be a positive integer less than 256 bytes in length');
        }
    }
}

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[-] sect283r1.php [edit]
[-] sect409k1.php [edit]
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[-] prime192v1.php [edit]
[-] brainpoolP384r1.php [edit]
[-] brainpoolP512r1.php [edit]
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[+] ..
[-] Curve25519.php [edit]
[-] prime239v3.php [edit]
[-] sect233k1.php [edit]
[-] secp256r1.php [edit]
[-] nistp384.php [edit]
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[-] secp128r1.php [edit]
[-] sect409r1.php [edit]
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[-] prime239v2.php [edit]
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[-] Curve448.php [edit]
[-] prime192v2.php [edit]
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[-] nistp224.php [edit]
[-] sect163k1.php [edit]
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[-] sect163r1.php [edit]
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[-] Ed25519.php [edit]
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[-] secp128r2.php [edit]
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[-] sect233r1.php [edit]
[-] sect239k1.php [edit]
[-] sect571k1.php [edit]
[-] secp521r1.php [edit]
[-] Ed448.php [edit]
[-] brainpoolP224t1.php [edit]
[-] secp384r1.php [edit]
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[-] brainpoolP320r1.php [edit]
[-] brainpoolP160r1.php [edit]
[-] nistk233.php [edit]