118 lines
2.3 KiB
PHP
118 lines
2.3 KiB
PHP
<?php namespace System;
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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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public $cipher;
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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 $mode;
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/**
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* Create a new Crypter instance.
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*
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* @param string $cipher
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* @param string $mode
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* @return void
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*/
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public function __construct($cipher = 'rijndael-256', $mode = 'cbc')
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{
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$this->cipher = $cipher;
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$this->mode = $mode;
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}
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/**
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* Create a new Crypter instance.
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*
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* @param string $cipher
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* @param string $mode
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* @return Crypt
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*/
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public static function make($cipher = 'rijndael-256', $mode = 'cbc')
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{
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return new static($cipher, $mode);
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}
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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 $value
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* @return string
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*/
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public function encrypt($value)
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{
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$iv = mcrypt_create_iv($this->iv_size(), $this->randomizer());
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return base64_encode($iv.mcrypt_encrypt($this->cipher, $this->key(), $value, $this->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 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 $value
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* @return string
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*/
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public function decrypt($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, $this->iv_size()), substr($value, $this->iv_size()));
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return rtrim(mcrypt_decrypt($this->cipher, $this->key(), $value, $this->mode, $iv), "\0");
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}
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/**
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* Get the application key from the application configuration file.
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*
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* @return string
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*/
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private function key()
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{
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if ( ! is_null($key = Config::get('application.key')) and $key !== '') return $key;
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throw new \Exception("The encryption class can not be used without an encryption key.");
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}
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/**
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* Get the input vector size for the cipher and mode.
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*
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* Different ciphers and modes use varying lengths of input vectors.
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*
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* @return int
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*/
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private function iv_size()
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{
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return mcrypt_get_iv_size($this->cipher, $this->mode);
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}
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} |