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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2017 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Crypt\Cipher;

\defined('JPATH_PLATFORM') or die;

use Joomla\Crypt\CipherInterface;
use Joomla\Crypt\Key;

/**
 * Crypt cipher for encryption, decryption and key generation via the php-encryption library.
 *
 * @since       3.5
 * @deprecated  5.0   Without replacement use SodiumCipher
 */
class CryptoCipher implements CipherInterface
{
	/**
	 * Method to decrypt a data string.
	 *
	 * @param   string  $data  The encrypted string to decrypt.
	 * @param   Key     $key   The key object to use for decryption.
	 *
	 * @return  string  The decrypted data string.
	 *
	 * @since   3.5
	 * @throws  \RuntimeException
	 */
	public function decrypt($data, Key $key)
	{
		// Validate key.
		if ($key->getType() !== 'crypto')
		{
			throw new \InvalidArgumentException('Invalid key of type: ' . $key->getType() . '.  Expected crypto.');
		}

// Decrypt the data.
		try
		{
			return \Crypto::Decrypt($data, $key->getPublic());
		}
		catch (\InvalidCiphertextException $ex)
		{
			throw new \RuntimeException('DANGER! DANGER! The ciphertext has been tampered with!', $ex->getCode(), $ex);
		}
		catch (\CryptoTestFailedException $ex)
		{
			throw new \RuntimeException('Cannot safely perform decryption', $ex->getCode(), $ex);
		}
		catch (\CannotPerformOperationException $ex)
		{
			throw new \RuntimeException('Cannot safely perform decryption', $ex->getCode(), $ex);
		}
	}

/**
	 * Method to encrypt a data string.
	 *
	 * @param   string  $data  The data string to encrypt.
	 * @param   Key     $key   The key object to use for encryption.
	 *
	 * @return  string  The encrypted data string.
	 *
	 * @since   3.5
	 * @throws  \RuntimeException
	 */
	public function encrypt($data, Key $key)
	{
		// Validate key.
		if ($key->getType() !== 'crypto')
		{
			throw new \InvalidArgumentException('Invalid key of type: ' . $key->getType() . '.  Expected crypto.');
		}

// Encrypt the data.
		try
		{
			return \Crypto::Encrypt($data, $key->getPublic());
		}
		catch (\CryptoTestFailedException $ex)
		{
			throw new \RuntimeException('Cannot safely perform encryption', $ex->getCode(), $ex);
		}
		catch (\CannotPerformOperationException $ex)
		{
			throw new \RuntimeException('Cannot safely perform encryption', $ex->getCode(), $ex);
		}
	}

/**
	 * Method to generate a new encryption key object.
	 *
	 * @param   array  $options  Key generation options.
	 *
	 * @return  Key
	 *
	 * @since   3.5
	 * @throws  \RuntimeException
	 */
	public function generateKey(array $options = array())
	{
		// Generate the encryption key.
		try
		{
			$public = \Crypto::CreateNewRandomKey();
		}
		catch (\CryptoTestFailedException $ex)
		{
			throw new \RuntimeException('Cannot safely create a key', $ex->getCode(), $ex);
		}
		catch (\CannotPerformOperationException $ex)
		{
			throw new \RuntimeException('Cannot safely create a key', $ex->getCode(), $ex);
		}

// Explicitly flag the private as unused in this cipher.
		$private = 'unused';

return new Key('crypto', $private, $public);
	}

/**
	 * Check if the cipher is supported in this environment.
	 *
	 * @return  boolean
	 *
	 * @since   4.0.0
	 */
	public static function isSupported(): bool
	{
		try
		{
			\Crypto::RuntimeTest();

return true;
		}
		catch (\CryptoTestFailedException $e)
		{
			return false;
		}
	}
}