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131 lines (117 loc) · 2.93 KB
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<?php
/**
* For the full copyright and license information, please view the
* docs/licenses/LICENSE.txt file that was distributed with this source code.
*/
use Defuse\Crypto\Crypto;
use Defuse\Crypto\Encoding;
use Defuse\Crypto\Key;
/**
* Class PhpEncryption engine for openSSL 1.0.1+.
*/
class PhpEncryptionEngineCore
{
protected $key;
/**
* PhpEncryptionCore constructor.
*
* @param string $hexString A string that only contains hexadecimal characters
* Bother upper and lower case are allowed
*/
public function __construct($hexString)
{
$this->key = self::loadFromAsciiSafeString($hexString);
}
/**
* Encrypt the plaintext.
*
* @param string $plaintext Plaintext
*
* @return string Cipher text
*/
public function encrypt($plaintext)
{
return Crypto::encrypt($plaintext, $this->key);
}
/**
* Decrypt the cipher text.
*
* @param string $cipherText Cipher text
*
* @return bool|string Plaintext
* `false` if unable to decrypt
*
* @throws Exception
*/
public function decrypt($cipherText)
{
try {
$plaintext = Crypto::decrypt($cipherText, $this->key);
} catch (Exception $e) {
if ($e instanceof Defuse\Crypto\Exception\WrongKeyOrModifiedCiphertextException) {
return false;
}
throw $e;
}
return $plaintext;
}
/**
* @param string $header
* @param string $bytes
*
* @return string
*
* @throws Defuse\Crypto\Exception\EnvironmentIsBrokenException
*/
public static function saveBytesToChecksummedAsciiSafeString($header, $bytes)
{
return Encoding::saveBytesToChecksummedAsciiSafeString($header, $bytes);
}
/**
* @return string
*/
public static function createNewRandomKey()
{
$key = Key::createNewRandomKey();
return $key->saveToAsciiSafeString();
}
/**
* @param string $hexString
*
* @return Key
*/
public static function loadFromAsciiSafeString($hexString)
{
return Key::loadFromAsciiSafeString($hexString);
}
/**
* @return string
*
* @throws Exception
*/
public static function randomCompat()
{
$bytes = Key::KEY_BYTE_SIZE;
$secure = true;
$buf = openssl_random_pseudo_bytes($bytes, $secure);
if (
$secure
&& mb_strlen($buf, '8bit') === $bytes
) {
return $buf;
}
throw new Exception('Could not gather sufficient random data');
}
/**
* @param string $buf
*
* @return string
*/
public static function saveToAsciiSafeString($buf)
{
return Encoding::saveBytesToChecksummedAsciiSafeString(
Key::KEY_CURRENT_VERSION,
$buf
);
}
}