110 lines
2.5 KiB
PHP
110 lines
2.5 KiB
PHP
<?php namespace Laravel\Security; use Laravel\Config;
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if (trim(Config::$items['application']['key']) === '')
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{
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throw new \Exception('The encryption class may not be used without an application key.');
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}
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class Crypter {
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/**
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* The encryption cipher.
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*
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* @var string
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*/
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protected static $cipher = MCRYPT_RIJNDAEL_256;
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/**
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* The encryption mode.
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*
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* @var string
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*/
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protected static $mode = 'cbc';
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/**
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* Encrypt a string using Mcrypt.
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*
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* The string will be encrypted using the cipher and mode specified when the
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* crypter instance was created, and the final result will be base64 encoded.
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*
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* <code>
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* // Encrypt a string using the Mcrypt PHP extension
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* $encrypted = Crypter::encrpt('secret');
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* </code>
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*
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* @param string $value
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* @return string
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*/
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public static function encrypt($value)
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{
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// Determine the most appropriate random number generator for the
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// OS and system and environment the application is running on.
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if (defined('MCRYPT_DEV_URANDOM'))
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{
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$randomizer = MCRYPT_DEV_URANDOM;
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}
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elseif (defined('MCRYPT_DEV_RANDOM'))
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{
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$randomizer = MCRYPT_DEV_RANDOM;
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}
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else
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{
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$randomizer = MCRYPT_RAND;
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}
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$iv = mcrypt_create_iv(static::iv_size(), $randomizer);
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$key = Config::$items['application']['key'];
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return base64_encode($iv.mcrypt_encrypt(static::$cipher, $key, $value, static::$mode, $iv));
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}
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/**
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* Decrypt a string using Mcrypt.
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*
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* <code>
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* // Decrypt a string using the Mcrypt PHP extension
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* $decrypted = Crypter::decrypt($secret);
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* </code>
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*
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* @param string $value
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* @return string
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*/
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public static function decrypt($value)
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{
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if ( ! is_string($value = base64_decode($value, true)))
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{
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throw new \Exception('Decryption error. Input value is not valid base64 data.');
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}
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list($iv, $value) = static::parse($value);
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$key = Config::$items['application']['key'];
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return rtrim(mcrypt_decrypt(static::$cipher, $key, $value, static::$mode, $iv), "\0");
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}
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/**
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* Parse an encrypted value into the input vector and the actual value.
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*
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* @param string $value
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* @return array
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*/
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protected static function parse($value)
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{
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return array(substr($value, 0, static::iv_size()), substr($value, static::iv_size()));
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}
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/**
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* Get the input vector size for the cipher and mode.
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*
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* Different ciphers and modes use varying lengths of input vectors.
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*
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* @return int
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*/
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protected static function iv_size()
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{
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return mcrypt_get_iv_size(static::$cipher, static::$mode);
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}
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} |