<?php
declare(strict_types=1);
namespace ParagonIE\Ristretto;
use ParagonIE\HiddenString\HiddenString;
use SodiumException;
class GroupElement extends Ristretto
{
/**
* @throws SodiumException
*/
public function add(GroupElement $element): GroupElement
{
$result = sodium_crypto_core_ristretto255_add(
$this->bytes->getString(),
$element->getBytes()->getString()
);
return new GroupElement(new HiddenString($result));
}
/**
* @throws SodiumException
*/
public static function random(): GroupElement
{
return new GroupElement(
new HiddenString(sodium_crypto_core_ristretto255_random())
);
}
/**
* @throws SodiumException
*/
public static function fromHash(string $hash): GroupElement
{
return new GroupElement(
new HiddenString(sodium_crypto_core_ristretto255_from_hash($hash))
);
}
/**
* @throws SodiumException
*/
public function sub(GroupElement $element): GroupElement
{
$result = sodium_crypto_core_ristretto255_sub(
$this->bytes->getString(),
$element->getBytes()->getString()
);
return new GroupElement(new HiddenString($result));
}
/**
* @throws SodiumException
*/
public function scalarPointMultiply(ScalarValue $s): GroupElement
{
return new GroupElement(
new HiddenString(
sodium_crypto_scalarmult_ristretto255(
$s->getBytes()->getString(),
$this->bytes->getString()
)
)
);
}
}
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