<?php
declare(strict_types=1);
namespace ParagonIE\Sapient\CryptographyKeys;
use ParagonIE\Sapient\CryptographyKey;
/**
* Class SharedEncryptionKey
* @package ParagonIE\Sapient
*/
class SharedEncryptionKey extends CryptographyKey
{
/**
* SharedEncryptionKey constructor.
* @param string $key
* @throws \RangeException
*/
public function __construct(string $key)
{
if (\ParagonIE_Sodium_Core_Util::strlen($key) !== SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES) {
throw new \RangeException('Key is not the correct size');
}
$this->key = $key;
}
/**
* @return SharedEncryptionKey
*/
public static function generate(): SharedEncryptionKey
{
return new SharedEncryptionKey(
\random_bytes(SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_KEYBYTES)
);
}
}
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