<?php
declare(strict_types=1);
namespace ParagonIE\Halite\Asymmetric;
use \ParagonIE\Halite\Alerts\InvalidKey;
use \ParagonIE\Halite\Util as CryptoUtil;
final class SignatureSecretKey extends SecretKey
{
/**
* @param string $keyMaterial - The actual key data
* @param bool $signing - Is this a signing key?
*/
public function __construct(string $keyMaterial = '', ...$args)
{
if (CryptoUtil::safeStrlen($keyMaterial) !== \Sodium\CRYPTO_SIGN_SECRETKEYBYTES) {
throw new InvalidKey(
'Signature secret key must be CRYPTO_SIGN_SECRETKEYBYTES bytes long'
);
}
parent::__construct($keyMaterial, true);
}
/**
* See the appropriate derived class.
*
* @return SignaturePublicKey
*/
public function derivePublicKey()
{
$publicKey = \Sodium\crypto_sign_publickey_from_secretkey(
$this->get()
);
return new SignaturePublicKey($publicKey);
}
}
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