<?php
namespace ParagonIE\CipherSweet\KeyProvider;
use ParagonIE\CipherSweet\Backend\FIPSCrypto;
use ParagonIE\CipherSweet\Backend\Key\SymmetricKey;
use ParagonIE\CipherSweet\Backend\ModernCrypto;
use ParagonIE\CipherSweet\Contract\BackendInterface;
use ParagonIE\CipherSweet\Contract\KeyProviderInterface;
/**
* Class RandomProvider
*
* This is mostly useful for initially key generation and/or unit testing.
*
* @package ParagonIE\CipherSweet\KeyProvider
*/
class RandomProvider implements KeyProviderInterface
{
/**
* @var BackendInterface
*/
private $backend;
/**
* RandomProvider constructor.
*
* @param BackendInterface $backend
*/
public function __construct(BackendInterface $backend)
{
$this->backend = $backend;
}
/**
* @return BackendInterface
*/
public function getBackend()
{
return $this->backend;
}
/**
* @return SymmetricKey
*/
public function getSymmetricKey()
{
if ($this->backend instanceof FIPSCrypto) {
return new SymmetricKey(
$this->backend,
\random_bytes(32)
);
} elseif ($this->backend instanceof ModernCrypto) {
return new SymmetricKey(
$this->backend,
\ParagonIE_Sodium_Compat::crypto_secretbox_keygen()
);
}
throw new \TypeError('Invalid Backend provided');
}
}
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