93 lines
1.9 KiB
PHP
93 lines
1.9 KiB
PHP
<?php namespace System;
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class Crypt {
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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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public static $cipher = '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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public static $mode = 'cbc';
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/**
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* Encrypt a value using the MCrypt library.
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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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$iv = mcrypt_create_iv(static::iv_size(), static::randomizer());
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return base64_encode($iv.mcrypt_encrypt(static::$cipher, static::key(), $value, static::$mode, $iv));
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}
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/**
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* Get the random number source available to the OS.
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*
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* @return int
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*/
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protected static function randomizer()
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{
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if (defined('MCRYPT_DEV_URANDOM'))
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{
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return MCRYPT_DEV_URANDOM;
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}
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elseif (defined('MCRYPT_DEV_RANDOM'))
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{
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return MCRYPT_DEV_RANDOM;
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}
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return MCRYPT_RAND;
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}
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/**
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* Decrypt a value using the MCrypt library.
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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, $value) = array(substr($value, 0, static::iv_size()), substr($value, static::iv_size()));
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return rtrim(mcrypt_decrypt(static::$cipher, static::key(), $value, static::$mode, $iv), "\0");
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}
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/**
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* Get the application key from the application configuration file.
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*
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* @return string
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*/
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private static function key()
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{
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if ( ! is_null($key = Config::get('application.key')) and $key !== '') return $key;
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throw new \Exception("The encryption class can not be used without an encryption key.");
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}
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/**
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* Get the input vector size for the cipher and mode.
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*
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* Different ciphers and modes use varying lengths of input vectors.
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*
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* @return int
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*/
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private static function iv_size()
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{
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return mcrypt_get_iv_size(static::$cipher, static::$mode);
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}
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} |