<?php
declare(strict_types=1);
namespace ParagonIE\Ristretto;
use Exception;
use ParagonIE\HiddenString\HiddenString;
use SodiumException;
class SecretKey extends ScalarValue
{
public function __construct(
protected HiddenString $bytes,
private ?PublicKey $pk = null
) {
parent::__construct($bytes);
}
/**
* @throws SodiumException
* @throws Exception
*/
public static function generate(): SecretKey
{
$sk = random_bytes(32);
$c = unpack('C', $sk[31])[1] & 0x1f;
$sk[31] = pack('C', $c);
$pk = sodium_crypto_scalarmult_ristretto255_base($sk);
return new SecretKey(
new HiddenString($sk),
new PublicKey(new HiddenString($pk))
);
}
/**
* @return PublicKey
* @throws SodiumException
*/
public function getPublicKey(): PublicKey
{
if (is_null($this->pk)) {
$pk = sodium_crypto_scalarmult_ristretto255_base($this->bytes->getString());
$this->pk = new PublicKey(new HiddenString($pk));
}
return $this->pk;
}
}
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